Solidity jobs

...comprehensive unit, integration, and edge-case tests. Identify vulnerabilities, logic errors, and potential attack vectors. Prepare contracts and deployment scripts for testnet and production environments. Document technical decisions, contract interfaces, and deployment procedures. Communicate progress, risks, and proposed solutions clearly. Preferred Experience Strong professional experience with Solidity and EVM-compatible networks. Experience developing and testing production-quality smart contracts. Practical knowledge of Foundry, Hardhat, OpenZeppelin, , viem, or similar tools. Experience with attestations, identity systems, soulbound tokens, credentials, reputation systems, or NFTs. Strong understanding of access control, signature verification, replay protection...

...protected by multi-signature access. My priority is to have the contract coded, fully tested, and ready for deployment as quickly as possible without compromising security or adherence to the official TRC20 standard. Please write the contract in Solidity, comment it clearly, and supply a brief README so I can redeploy or verify it myself later. A small, self-contained test script (TronBox, Hardhat, or a comparable framework) that proves the burn function and the multi-sig requirement are working will speed up my review. Deliverables: • Auditable Solidity source code implementing TRC20 with burnable capability and multi-sig control • Compiled bytecode, ABI, and deployment steps • A short test suite that shows the burn logic and multi-sig approval flow i...

Project overview Web development / New project Expected to be completed by Sep 05, 2026 Request details Project Overview I'm looking for an experienced Solidity/Web3 developer who can build a smart contract that integrates with Aave V3 and can receive a flash loan of USDT liquidity. The goal is to have the entire process execute atomically in one blockchain transaction. Required Logic The smart contract should: Initiate/receive a USDT flash loan from Aave V3. Receive the flash-loaned USDT into my smart contract. Transfer the borrowed USDT from the smart contract to another wallet that I control. Allow me to perform my required strategy/work with those funds. Have the necessary logic to return the required principal + Aave flash-loan fee back to the smart contract within th...

...an MVP running on a standard EVM stack—Solidity contracts, a React.js interface, and a small Node/Express backend—but it needs a seasoned full-stack blockchain developer to turn it into a production-ready dApp. What you’ll walk into • An existing GitHub repo with a functional proof-of-concept. • React is baked in (the chosen framework); designs are still coming together, so some screens will arrive progressively. • Solidity contracts compile and deploy, but they still need a proper security pass, gas-cost tuning, and upgradeability considerations. • Only WalletConnect is required for the first release, yet the codebase should remain flexible enough to add MetaMask or Coinbase Wallet later. First milestones • Finalise a...

...route each payment and enrollment request to an admin dashboard where staff can verify KYC details, approve or reject registrations and manage fee settlements • store all critical actions in Solidity smart contracts, fully tested and verified on Etherscan, with events that keep the front-end in sync • give admins rich analytics—total fees collected, outstanding balances, course capacity, student status—through a clean web dashboard Tech stack is your choice so long as the front-end is modern (React, or similar) and speaks to the contracts via or web3.js. I’ll need: 1. Audited Solidity contracts, deployment scripts (Hardhat preferred) and unit tests 2. Responsive UI/UX that covers student, instructor and admin views 3. Clear documen...

...sessions, completing reflection exercises). Only the reward mechanism is required; no on-chain attendance tracking or complex token issuance logic beyond minting and distributing the tokens. Key expectations & deliverables 1. Feature list with brief description of how each item will work. 2. Technical proposal (front-end, back-end, smart-contract stack; common choices might be React, Node, Solidity, or a low-code Web3 platform—tell me what you’d use and why). 3. Timeline broken into milestones. 4. Cost per milestone and total project price. 5. Post-launch hand-off plan including all documentation. Acceptance criteria • Students can register, log in, and book sessions end-to-end. • Smart contract deploys on a public testnet and issues rewa...

...understanding of Bitcoin, cryptocurrency and mining * Knowledge of PoW and PoS * Understanding of Smart Contracts * Familiarity with Hyperledger * Understanding of IPFS and NFTs * Ability to explain technical concepts clearly to undergraduate students * Good classroom communication and presentation skills * Prior academic or corporate training experience is preferred Experience with **Ethereum, Solidity, Hyperledger Fabric, Web3 or blockchain-based applications** will be an advantage. ### Student Activities The trainer will also guide students through curriculum-related activities such as: * Case study on blockchain mining, cryptocurrency and mining pools * Discussion on blockchain integrity * Student presentation on blockchain applications and digital asset management ### P...

...a complete blockchain-powered backend whose main role is to run and interact with smart contracts. Your task is to design, code, test, and deploy those contracts and then expose their functions through a clean API that my front-end team can consume. The choice of chain and contract language is open; whether you prefer Ethereum, Hyperledger, or Binance Smart Chain, and whether you work best in Solidity, Rust, or Vyper, I am happy to follow your technical lead as long as the solution is secure and maintainable. Security, gas or resource efficiency, and clear documentation matter most to me. The API should support standard CRUD-style interactions with contract state and include basic authentication so we can drop it straight into our staging environment. Deliverables • Full...

...config | MODULE 4: Alt-UTXO Adapters| Built | Configure RPC endpoints | MODULE 5: EVM PoW Deploy | Built | Deploy to ETHW / Syscoin testnets | MODULE 6: Monero Adapter| Built | Connect to `monero-wallet-rpc` | MODULE 7: Beldex Adapter | Built | Connect to `beldexd` | MODULE 8: Frontend Bridge| Built | Inject into HTML UI & test | Detailed Scope of Work (The 8 Modules) MODULE 1: Subsidy Pool (Solidity) Needs deployment via Hardhat/Foundry and integration testing with the relayer reimbursement logic. MODULE 2 Job 2: UTXO Harness (Rust) Needs live Testnet execution. Must handle real faucet funding, broadcast actual P2WSH HTLC locks, and execute preimage claims on BTC/LTC Testnet. MODULE 3: Relayer Daemon (Rust) Needs environment configuration, live Chain 210 event monitori...

...TRON code-base and CLONE it into a clean, standalone network that runs on just three validator nodes, using Delegated Proof of Stake (DPoS) as its consensus. The goal is to have a lightweight but fully functional chain that preserves TRON’s performance advantages while letting me control every aspect of the environment. Key capabilities I want built in from day one are smart-contract execution (Solidity-compatible), on-chain token creation/management, and a governance layer so stakeholders can vote on upgrades or parameter changes. I do not have a rigid block-time requirement; please recommend the most practical interval for a three-node DPoS setup and be ready to justify the choice from a throughput and finality standpoint. I expect the work to cover: • Clone the ...

...liquidity through basic liquidity pools. A clean and responsive frontend DApp is required with wallet connection, token creation, token listings, swapping, liquidity management, and transaction status. The frontend can be built with React or , using Solidity for smart contracts and or viem for Web3 integration. This is an MVP/testnet project, so the focus is on having everything functional, stable, and easy to use rather than building a large production-level platform. The developer should have solid experience with Solidity, EVM-compatible chains, smart contracts, React/, Web3 integration, and DEX/AMM development. The complete project should be delivered within one week, including deployment, testing, bug fixing, source code, and basic setup documentation. Please s...

...application that works seamlessly across both Solana and EVM chains. Core scope • Wire Codex outputs into a clean, well-structured repository, refining or rewriting code where AI falls short. • Build and connect key DeFi modules—wallet services, decentralized exchange interactions, trading terminals, and launchpad functionality—so they operate reliably on Solana (Rust/Anchor) and on EVM networks (Solidity/Hardhat). • Handle cross-chain logic, RPC endpoints, and security hardening, ensuring transactions, signatures, and token standards behave identically on both ecosystems. • Integrate front-end components (React/, , ) with the contract layer and automate tests and deployments (CI/CD, Foundry, Anchor test suite). I’ll supply: &...

I’m launching a DeFi application on the Ethereum network and need a developer who can take full ownership of the smart-contract layer. The core goal is to design, code, and deploy Solidity contracts that power the protocol’s functionality while keeping security and gas efficiency front of mind. Key expectations • Architect and write production-ready smart contracts for a DeFi application (Solidity on Ethereum). • Create migration/deployment scripts and configure Hardhat or Truffle for local and testnet environments. • Build a concise test suite (Mocha/Chai or similar) covering edge cases, exploits, and upgrade paths. • Optimise gas usage and follow current best practices for re-entrancy guards, overflow checks, and access control (Open...

...identity is verified, the verified KYC data can be reused across multiple banks, reducing duplicate verification, saving time, and lowering operational costs. A credit assessment module analyzes the customer's financial information and credit history to support fair and faster credit allocation. Technologies Used: Frontend: HTML, CSS, JavaScript Backend: Java, Spring Boot Blockchain: Ethereum, Solidity, Web3j Database: MySQL Key Features: Secure and decentralized KYC storage Tamper-proof customer records using blockchain Smart contract-based KYC verification Faster and transparent loan approval process Reduced fraud and duplicate KYC submissions Improved customer trust and data privacy Outcome: This project enhances the security, transparency, and efficiency of banking op...

## Build an Advanced DeFi Flash Loan Arbitrage Bot for BSC I’m looking for an experienced Solidity / DeFi developer to build a high-performance **Flash Loan Arbitrage Bot** for Binance Smart Chain (BSC). I have already completed extensive research and reverse engineering of an existing deployed smart contract to understand its architecture and transaction flow. I also have live on-chain transaction history and contract interactions for reference. The goal is **not** to clone or copy the existing contract, but to develop a **new implementation** with similar trading logic, improved architecture, better gas optimisation, and stronger security. ### Reference repository ### Available references * Decoded contract source for research * Dedaub

...and broadcasting the low-level transactions (RLP encoding, nonce and gas management, offline signing, etc.) that will deploy and interact with the contract. • A bespoke token smart contract – the core logic is outlined but still flexible; I want to be certain the code is solid, secure and optimised before it goes live. Here’s what I’m expecting from our collaboration: 1. Review or write the Solidity for this custom token contract, compile it and demonstrate successful deployment on a public testnet. 2. Produce example raw transactions for key actions (deployment, mint/transfer or any additional functions we agree on). Scripts can be in Hardhat, Foundry, or even pure web3—whichever you’re fastest with. 3. Walk me through each step so I un...

...manufacturing industry, please try the following adjustments: De-clutter the design: The current font feels a bit too much like a law firm or a magazine. Please try removing the serifs and switch to a sans-serif font. Alternatively, keep minimal serifs so the lines look as sharp and clean as a mechanical cut. Add visual weight: The current strokes are a bit thin. Please thicken them to convey a sense of solidity and stability, much like metal parts. Structural integration: The 'H' and 'F' are currently a bit separated. Please try making them share the middle vertical line, or create a geometric connection between the right side of the 'H' and the left side of the 'F'. This would give a sense of 'integrated manufacturing'. Cham...

# Build an Advanced DeFi Flash Loan Arbitrage Bot (BSC) ## Project Overview I'm looking for an experienced Solidity/DeFi developer to build a high-performance **Flash Loan Arbitrage Bot** for Binance Smart Chain (BSC). I have already completed extensive research and reverse engineering of an existing deployed smart contract to understand its architecture and transaction flow. I also have live on-chain transaction history and contract interactions for reference. The objective is **not to clone or copy** an existing contract, but to develop a new implementation with similar trading logic, improved architecture, better gas optimization, and enhanced security. ## Available References I will provide: * Decoded contract source for research * Dedaub analysis * Live deployed con...

... Build and maintain the backend API orchestrator (Express/TypeScript) to manage the 7-stage payment pipeline Write secure, well-tested, and documented code for our core infrastructure Collaborate with the team on architecture decisions and technical roadmap REQUIREMENTS 3+ years of software development experience, with at least 2 years of hands-on blockchain development Deep expertise in Solidity and experience with EVM-compatible chains (Ethereum, Base, Arbitrum, Polygon) Strong proficiency in TypeScript/JavaScript for backend development (Node.js) Experience developing and deploying smart contracts in production environments Understanding of ZKPs (Zero-Knowledge Proofs) and their application in privacy-preserving protocols Experience with cross-chain messaging protocol...

...We need someone who can independently manage the complete recruitment lifecycle—from sourcing top talent to coordinating interviews and helping us hire the right candidates. What You'll Be Hiring For We are actively hiring: • Full Stack Developers • Frontend Developers (React, , Vue.js, Angular) • Backend Developers (Node.js, NestJS, Python, Django, .NET, Java) • Blockchain Developers (Solidity, Ethereum, Polygon, Solana, Web3) • AI & Data Engineers (Preferred) • DevOps Engineers (Preferred) Responsibilities • Manage the complete recruitment process from start to finish. • Create and optimize job postings on Upwork and other relevant platforms. • Source high-quality candidates using LinkedIn, GitHub, Upwork, and other ch...

Technical Co-Founder (Lead Web3 Developer) What You Will Do: Setup PostgreSQL/Node.js backend, DB schema, and Web of Trust invitation logic. Develop and deploy Web3 authentication (MetaMask/WalletConnect) and SBT (Soulbound Token) Citizen IDs. Write, test, and deploy Solidity/EVM smart contracts for our Quadratic Voting and Multi-sig Guardrail systems. Requirements: Strong experience in Full-Stack development (, Node.js, PostgreSQL). Proven experience with Web3 libraries (, viem) and Smart Contracts (Solidity/Foundry). Must be based in Bangladesh for active collaboration. POSITION 2: Lead UI/UX Designer (Figma) What You Will Do: Design a clean, minimalist, and highly professional 2D Web3 Dashboard on Figma. Create logical UI flows for wallet connection, voter portals,...

...for? The entire blueprint, architecture, and structural file for the project are completely ready. Right now, I need a visionary Technical Co-founder / Lead Developer from Bangladesh who can stand shoulder-to-shoulder with me to bring this vision to life through coding and infrastructure. What you should bring to the table: Experience or a deep interest in Web3, Blockchain, Smart Contracts (Solidity/Rust), and DAO architecture. Cybersecurity / Ethical Hacking Skills: Since this is a human-driven economy with real-world monetary value, you must have the capability to design secure systems, prevent vulnerabilities, and mitigate hacking/exploit risks within the game environment. The mindset to build a large-scale platform completely from scratch. Most importantly—the driv...

...What am I looking for? The entire blueprint, architecture, and structural file for the project are completely ready. Right now, I need a visionary Technical Co-founder / Lead Developer who can stand shoulder-to-shoulder with me to bring this vision to life through coding and infrastructure. What you should bring to the table: Experience or a deep interest in Web3, Blockchain, Smart Contracts (Solidity/Rust), and DAO architecture. The mindset to build a large-scale platform completely from scratch. Most importantly—the drive and leadership qualities to turn an entirely new concept into reality. The Setup: Since this is the beginning of a massive dream, we will initially start on a partnership/equity (Equity/Token Share) basis. If you feel you are ready to take on this cha...

...What am I looking for? The entire blueprint, architecture, and structural file for the project are completely ready. Right now, I need a visionary Technical Co-founder / Lead Developer who can stand shoulder-to-shoulder with me to bring this vision to life through coding and infrastructure. What you should bring to the table: Experience or a deep interest in Web3, Blockchain, Smart Contracts (Solidity/Rust), and DAO architecture. The mindset to build a large-scale platform completely from scratch. Most importantly—the drive and leadership qualities to turn an entirely new concept into reality. The Setup: Since this is the beginning of a massive dream, we will initially start on a partnership/equity (Equity/Token Share) basis. If you feel you are ready to take on this challe...

...infrastructure; paid APIs; AI-model usage; paid third-party software; domain names; email services; payment-provider fees; hardware manufacturing; physical IoT devices; robotics equipment; long-term maintenance; post-warranty support. Mandatory Requirements Applicants must demonstrate: proven experience with blockchain projects; experience with smart contracts deployed on mainnet; strong expertise in Solidity; strong expertise in ERC-20; experience with Base or another EVM-compatible blockchain; experience with OpenZeppelin; experience with Safe multisig; smart-contract security knowledge; frontend-development capabilities; backend-development capabilities; database-development capabilities; REST API-development capabilities; DevOps capabilities; AI and automation experience; S...

...TRON code-base and fork it into a clean, standalone network that runs on just three validator nodes, using Delegated Proof of Stake (DPoS) as its consensus. The goal is to have a lightweight but fully functional chain that preserves TRON’s performance advantages while letting me control every aspect of the environment. Key capabilities I want built in from day one are smart-contract execution (Solidity-compatible), on-chain token creation/management, and a governance layer so stakeholders can vote on upgrades or parameter changes. I do not have a rigid block-time requirement; please recommend the most practical interval for a three-node DPoS setup and be ready to justify the choice from a throughput and finality standpoint. I expect the work to cover: • Forking the...

TRC-20 Token Smart Contract Development (TRON) I am looking for an experienced blockchain developer to create and deploy a professional TRC-20 token on the TRON blockchain. Token Details Token Name: Quantra Sy...SunSwap and TronScan verification. Provide the verified source code after deployment. Help verify the contract on TronScan. Assist with creating the QTRA/USDT liquidity pair on SunSwap. Deliverables Smart contract source code. Successful deployment on TRON Mainnet. Contract verification on TronScan. Contract address. Deployment documentation. Basic post-deployment support. Preferred Experience Solidity TRON / TRC-20 TronWeb / TronBox Smart contract auditing SunSwap integration Please include examples of previous TRON token deployments or verified smart contracts you have ...

I need an experienced Solidity engineer to take full ownership of our smart-contract layer—from initial design through main-net deployment. Your day-to-day work will include writing clean, upgradeable contracts, setting up automated test suites, running security checks with tools such as Hardhat, Foundry, Slither or MythX, and fine-tuning gas usage so our users pay as little as possible. You will collaborate directly with our front-end team; once a contract is ready, you’ll expose ABI endpoints, write simple integration docs and jump on a quick call if something breaks in staging. Expect regular code reviews on GitHub, coverage reports in CI, and at least one external audit before we push to production. What I’m looking for • Proven track record of shippin...

Solidity + Full-Stack Dev -- ERC-20 Token Platform on Base ERC-20 token on Base, written audit-ready in Solidity Wallet integration and on-chain settlement Full-stack web app: React/, Node.js, PostgreSQL, AWS Platform modules: finance, identity, data marketplace, collaboration, AI analytics API integration with an existing enterprise system Smart contract audit coordination and mainnet deployment Need devs or small teams who have shipped real token-based products to production. No conceptual pitches. Reply with: Links to deployed projects with on-chain components Your rate or rough estimate for this scope 9-10 hrs daily Availability Looking for long term contract Please describe real rates; if you bid lower and then put your new rates, you will be disqualified.

...middlemen. The attached docx lays out user flows, contract interface, and UI wireframes; you’ll turn that vision into code. Key context • Our creators’ core need is simple: raise funds for their projects. • The first public release will showcase technology-focused campaigns, giving us a clear niche to test traction before we expand. What I need from you 1. Develop and thoroughly test the Solidity contracts exactly as specced, including create-campaign, contribute, refund, and withdrawal logic. 2. Build a lightweight React (or similar) front-end that connects via , shows live funding progress, and lets users launch or back a campaign in one transaction. 3. Deploy to a public testnet, integrate wallet connectors (MetaMask, WalletConnect), and provi...

... asset-backed, or equity) and the underlying chain (Ethereum, Binance Smart Chain, Stellar, or another you recommend). What matters most is that the structure meets relevant securities regulations and is technically sound. Key objectives • Design the token’s economic model and compliance flow so investors receive returns legally and transparently. • Write and audit the smart contract code (Solidity or the language suited to your chosen chain) with features such as transfer restrictions, whitelisting/KYC hooks, dividend or profit-sharing logic, and upgradeability. • Deploy the contract to testnet, run unit tests, and hand over a clear deployment script or walkthrough for mainnet. • Provide concise technical documentation covering contract functions...

...before submission. Key requirements • Real-time price monitoring with sub-second latency (I’m happy to run a dedicated node or use WebSocket endpoints if that helps). • Fully automated trade execution from detection through settlement, no manual clicks. • Dynamic transaction-fee optimisation—use gas price oracles and settle only when the net profit after gas is positive. • Written in Solidity for the on-chain contract and either Hardhat or Foundry for testing; TypeScript/ for the off-chain listener is preferred. • Clear README plus hard-fork mainnet-fork tests showing at least one successful arbitrage cycle. Acceptance criteria 1. Deployable smart contract that requests and repays Aave flash loans in the same transaction. 2. ...

...writing and testing production-grade smart contracts to troubleshooting main-net deployments, building full dApps, and occasionally reviewing other developers’ code for security and gas optimisation. Because our clients come with very different ideas, you should be comfortable jumping between chains such as Ethereum, Binance Smart Chain, or even Polkadot when required, and you’ll likely touch Solidity most days, with Rust or Go popping up on some specialty jobs. If you have strengths in only one of those stacks, that’s fine—we can shape early tasks around your core expertise and then branch out together. Typical week-to-week work might involve: • Designing and unit-testing new smart contracts • Integrating on-chain logic with React or front e...

...multi-chain (Ethereum, BSC, Solana, Base) • Bridge cross-chain (LayerZero, Stargate, ) • DeFi ops (Aave, Lido, GMX, Hyperliquid, Pendle) • Token sniping (anti-honeypot, rugcheck, GoPlus) • Mempool watch + whale tracker (Nansen, Arkham) • NFT marketplace (Blur, Magic Eden, Tensor, OpenSea) • Smart contract read/write (ABI inspector, proxy, EIP-712) • Deploy contract (Foundry, Solidity, CREATE2) • SIWE/WalletConnect auth • Browser automation untuk dApps (Playwright) Automation/Dev (m-cluster): • Telegram/Discord bot (cron, webhook, auto-trigger) • Web scraper + data pipeline • API integration (Midtrans, Stripe, n8n, REST/GraphQL) • VPS management (SSH, nginx, docker, systemd) • LLM ...

Position Type : Full-time/Part-Time Location : 100% Remote Compensation: $195K to $220K Company: Qualifications • Strong skills in Solidity and the EVM • Ability to architect, implement, and deploy secure smart contracts • High attention to detail with a genuine passion for every project • Ability to write well documented code Bonus Points • gRPC / REST API integration • Zero-Knowledge(ZK) concepts and tools(Circom, SnarkJS) • Familiarity with audit tools like Slither, MythX • Ability to read and analyze other projects' smart contracts Hiring Process - Test assignment: a practical exercise relevant to the role - Technical interview: to discuss your solution, skills, and problem-solving - Final interview: to talk about culture fit, exp...

...parties. • Direct match-result posts to an official Telegram bot/channel for community buzz. Interface I need a medium level of visual customization: branded color palette, logo integration, and custom table backgrounds while leaving core Ludo mechanics untouched. Responsive layouts for desktop browsers, tablets, and a range of Android screen sizes are essential. Payments & security • Solidity (or comparable) USDT escrow contract, deployed and verified. • Clear on-chain audit trail for every game. • Server authority for physics/random seed to prevent client tampering. Deliverables 1. Unity (or equivalent) project with separate WebGL and Android builds. 2. Deployed, tested USDT escrow smart contract, source code included. 3. Backend match...

...matrix plan. The smart contract must facilitate automatic payouts. Key Requirements: - Develop an MLM binary matrix plan - Implement smart contract with automatic payouts - Proficient in Solidity and BNB Smart Chain - Experience with WalletConnect and MetaMask - Strong background in Web3 development Ideal Skills: - Blockchain development expertise - Smart contract development in Solidity - Familiarity with MLM structures and functionalities - Strong problem-solving and coding skills Build BNB Chain Smart Contract Platform with Referral & 3x8 Matrix System" Requirements: BNB Smart Chain Smart Contract Solidity Development USDT (BEP20) Integration MetaMask Integration WalletConnect Integration Referral System 3x8 Matrix Logic Sponsor Income Calculation Clu...

...writing and testing production-grade smart contracts to troubleshooting main-net deployments, building full dApps, and occasionally reviewing other developers’ code for security and gas optimisation. Because our clients come with very different ideas, you should be comfortable jumping between chains such as Ethereum, Binance Smart Chain, or even Polkadot when required, and you’ll likely touch Solidity most days, with Rust or Go popping up on some specialty jobs. If you have strengths in only one of those stacks, that’s fine—we can shape early tasks around your core expertise and then branch out together. Typical week-to-week work might involve: • Designing and unit-testing new smart contracts • Integrating on-chain logic with React or front...

...midway through building a new on-chain lending/borrowing platform and I need a Solidity engineer who can take full ownership of the remaining smart-contract work. The core lending logic, interest-rate model, collateral accounting, liquidation flow and incentive token mechanics must be written, optimised and fully tested so we can move straight to external audit. You will be working in a Hardhat environment (happy to switch to Foundry if that is your preference) and leveraging OpenZeppelin libraries where sensible. Gas efficiency, upgrade-safety and clean, well-documented code are paramount; I intend to keep the contracts lean enough for a formal verification pass later. Deliverables • Complete Solidity contracts for lending, borrowing, collateral and liquidat...

looking for an experienced blockchain developer to build a decentralized exchange (DEX). The project includes smart contract development, wallet integration, token swaps, liquidity pools, and frontend integration. Requirements: - Strong Solidity experience - Previous DEX or DeFi development - Experience with Hardhat/Foundry - React/ + or Viem - Knowledge of AMM, liquidity pools, and blockchain security Please share: - Relevant DEX/DeFi projects - GitHub or portfolio - Your estimated timeline and budget Only apply if you have proven experience building blockchain or DeFi applications.

...Budget: $120,000 to $140,000 per year, paid monthly. Role Overview We are hiring a senior Blockchain Engineer to help design and build a copy trading protocol with on-chain vaults, relay contracts, and cross-chain settlement infrastructure. The role requires production-grade experience across Ethereum, Solidity, DeFi systems, and security-focused smart contract development. Technical Requirements Candidates should have 4+ years of professional experience and strong hands-on expertise with: Solidity 0.8.25+ and Foundry Ethereum and EVM architecture , , and TypeScript Rust and Solana development DeFi protocols and on-chain trading systems Git, Docker, and CI/CD pipelines Security auditing, testing, and mainnet-fork workflows Cross-chain infrastructure and blockchain integrat...

I need a solid ERC-20 smart contract that supports on-demand minting and follows best-practice security patte...supply, and call the mint function in a single, smooth flow. A clean React or front end with is fine; if you prefer Vue or another modern stack, I’m open as long as the UX is clear and responsive. Key acceptance criteria: • Verified, optimised Solidity code deployed on Ethereum mainnet (testnet first for review). • Minting controlled by owner role, with events properly emitted. • Front-end fully wired to the contract, wallet-connect ready, and deployed to a public URL. • Full hand-over of source (Solidity, front-end, and deployment scripts). Once we agree on milestones I’ll supply the token name, symbol, and any brandi...

...upgradeability in mind. I have not locked in a chain yet, so if you are comfortable on Ethereum, Binance Smart Chain, Polkadot, or can justify another EVM-compatible network, please outline why it fits. I’m equally open on the contract’s purpose: token logic, an NFT framework, or a back-end for a dApp are all in scope; the key is that the code is solid and audit-ready. Deliverables • Full Solidity (or relevant) source with in-line comments • Comprehensive unit tests and deployment scripts (Hardhat or Truffle preferred) • Brief hand-over document explaining functions, upgrade path, and security considerations Acceptance criteria • Passes 100 % of agreed test cases • Deploys successfully to testnet without reverts • Gas usage...

I'm building a real-world-asset (RWA) p...contract refinement, production front-end, solid architecture, and backend integration. You'll work on: - Solidity contracts (tokenization, governance, payouts) – aiming for 90% test coverage + audit readiness - React/ front end – Web3 integration, responsive dashboard - Blockchain architecture – chain selection, nodes, oracles, security - Backend (Node.js/Python) – REST/GraphQL APIs, KYC hooks, Postgres Requirements: - Contracts deployed to testnet with static analysis passed - Front end connects via MetaMask & WalletConnect - Documented backend endpoints - Brief architecture summary GitHub daily commits, PR reviews, and Slack/Discord stand-ups. If you're comfortable with Solidity, TypeS...

...feedback submission, or community engagement. Basic anti-Sybil measures, including wallet verification and duplicate detection, should be included to prevent abuse. From a technical perspective, the MVP should include a frontend built in React or with wallet integration (MetaMask, WalletConnect), a backend using Node.js or Supabase to handle user scores, quests, and project data, and Solidity smart contracts to manage allocation logic and whitelist verification. An admin panel should allow project listings, configuration of token sale details, management of allocation tiers, and monitoring of user activity. A clean and intuitive UI/UX is important for both users and admins. How to Apply Please provide: Examples of Web3 projects or launchpads you’ve built. Your suggested...

...touching the command line. The contract must be solidly coded in Solidity, thoroughly tested, and deployed to the mainnet once we finish our reviews. On the front-end I want a lightweight React (or similar) page that talks directly to the contract. Wallet integration is essential—MetaMask and any other common Web3 wallets should connect seamlessly so users can approve, send, and monitor transactions. A clear, searchable transaction history pane is the second must-have so people can verify their activity in real time. Beyond those core pieces I have several additional features in mind; I’ll share the full list and wireframes once we start and would appreciate your input on the best way to prioritise them. Deliverables • Solidity contract with full ...

...features. Security review and bug fixing related to the implemented modules. Resources Provided Existing VP Coin token contract. Complete project source code (available on our private website). Deployment and implementation videos (available on our private website). Documentation and access required for development. Developer Requirements Strong experience with blockchain development. Experience with Solidity smart contracts. Experience with staking and liquidity pool implementations. Familiarity with Web3 integration and wallet connectivity. Ability to review existing code and continue development efficiently. Deliverables Fully functional staking module. Liquidity pool integration working correctly with VP Coin. Tested and documented implementation. Source code updates and depl...

We are looking for an experienced Blockchain Developer / Solidity Smart Contract Engineer to design and deploy a fully decentralized token ecosystem on the Binance Smart Chain (BSC). The project involves a custom BEP-20 token, PancakeSwap integration, and an on-chain MLM (Multi-Level Marketing) distribution mechanism — all controlled 100% by smart contract logic with no central authority. Project Requirements 1. Token Deployment on BSC (BEP-20) Deploy a verified, auditable BEP-20 token on BSC Mainnet (visible on BscScan) Token must be fully decentralized — no owner mint privileges, no backdoors Token listed and tradeable on PancakeSwap V2/V3 2. Smart Contract – MLM Distribution Engine The core smart contract must handle the following automated fund distribution...

I need an EVM-compatible utility token deployed on Base for my upcoming gaming site. Players will log in with MetaMask, pay the platform in this new token, and—behind the scenes—my smart contract must swap the incoming tokens to USDC so merchants see funds settle automatic...most is a seamless, gas-efficient flow: • MetaMask connection on web front-end • ERC-20 (or optimized equivalent) minted on Base • Automated on-chain swap that routes each payment to USDC and transfers it to the merchant wallet in a single transaction • Clear documentation and a simple test interface so I can simulate a purchase and watch the conversion complete If you can ship audited solidity, a concise deployment script, and short integration notes for my dev team, let&...

...tokenomics sketched out; what I’m missing is a hands-on specialist who can finish the technical set-up and keep everything running smoothly. On the NFT side, the immediate job is to get the collection live on major marketplaces such as OpenSea or Rarible, make sure royalties are configured correctly, and troubleshoot any wallet or metadata issues that pop up. Smart-contract tweaks may be needed so Solidity experience is important, and familiarity with IPFS/Pinata for hosting is a plus. For the token, I need a standard ERC-20 (or equivalent) contract written, verified, and deployed, followed by an initial distribution to early backers. Clear documentation of the contract address, ownership keys, and supply breakdown must be provided so there are no loose ends. Deliverable...