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BLOCKCHAIN DEVELOPER (ZK & CROSS-CHAIN) Exp: 6 yrs We are looking for a passionate Blockchain Developer to take ownership of smart contract development, ZK proof integration, and our cross-chain payment pipeline. You will work directly with our Lead/Project Manager and a team of engineers to build the protocol's core infrastructure. Key Responsibilities: Design, develop, and deploy smart contracts for our ConfidentialPayroll protocol across Ethereum, Solana, and other VMs Integrate zero-knowledge proof systems (Ligero/Arc) for transaction privacy and compliance Implement cross-chain settlement mechanisms using Circle's CCTP and Hyperlane Integrate FHE (Fhenix/Zama) for encrypted state management of payroll rosters 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 protocols (e.g., Hyperlane, Wormhole, CCTP) Knowledge of cryptography fundamentals and blockchain security best practices Excellent communication skills and ability to work effectively in a fully remote, asynchronous environment Bonus Points (Nice to Have): Experience with Solana development (Rust/Anchor) Familiarity with FHE libraries (Zama, Fhenix) Experience building payroll or payments infrastructure Understanding of Circle CCTP attestations and burn-and-mint mechanics
Project ID: 40584173
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33 freelancers are bidding on average ₹269,052 INR for this job

Hi, your "Experienced Blockchain Developer Needed" project is right in my wheelhouse. I develop modern JavaScript apps end to end — React/Vue/Next on the front and Node/Express on the back, in TypeScript where it helps. Working with php, java, javascript, software architecture, node.js, blockchain, solidity, smart contracts, I focus on responsive, fast UIs, clean component structure, and reliable APIs — no page-builder shortcuts. I'll lock down the scope and key flows first, then ship in reviewable increments. Let's hop on a quick chat to align on your requirements? ⭐ 5.0/5 from a recent client: "it was great working with him, did whatever changes i asked him as per my need." Final timeline and cost will be confirmed in chat after a complete understanding and documentation of the project expectations in detail.
₹225,000 INR in 33 days
7.8
7.8

With over 20 years of collective experience, our team at DSV Infosolutions Pvt. Ltd. houses some of the most experienced and knowledgeable blockchain developers in the industry, so you can be sure your project will be handled by an adept professional - me. Having honed my skills with various blockchain platforms including Ethereum, Binance Smart Chain, Polygon, Tron, Cardano, Solana, Avalanche and more, I am deeply familiar with the ZK proof integration and cross-chain payment mechanisms you require. At its core, a successful blockchain project needs secure code that withstands the test of real-world environments - an area where my extensive experience in writing secure smart contracts would excel. Joining your team would also provide me an opportunity to contribute to your 7-stage payment pipeline as well as collaborate on vital architecture decisions for both present and future roadmap. Last but not least, I am comfortable working remotely and well-equipped to communicate effectively in such settings as we have done it at DSV since our establishment in 2011. I eagerly await the chance to show you the quality workmanship and dedication that has fueled our exponential growth in this dynamic industry. Thank you for considering me for this role.
₹200,000 INR in 7 days
8.3
8.3

With over 6 years of experience in software development, including 2+ years of Blockchain experience, I bring strong expertise to the table. My proficiency with Solidity and EVM-compatible chains such as Ethereum and Solana aligns well with the blockchain-focused tasks this project demands. I have hands-on experience deploying smart contracts in production environments and navigating cross-chain messaging protocols. My technical skills extend beyond Blockchain development to full stack web and mobile app development, C++, Python, and cloud computing like AWS & Google Cloud. Alongside that, I'm experienced with Safe-Guard technologies, DevOps practices, and CI/CD Pipelines which are valuable in assuring secure, high-performing solutions. The intersectionality of my skills will enable me not only to contribute effectively in creating your core blockchain infrastructure but also assist with backend API orchestration using Express/TypeScript. In addition to technical versatility, transparent communication has always been fundamental to my practice. I believe in keeping clients informed about the progress; promptly addressing concerns being my top priority. My goal is your project's success and I am committed to bringing it to life seamlessly, cost-effectively, and with an unwavering focus on security & scalability. Let's transform your vision into an exceptional reality together!
₹250,000 INR in 7 days
6.6
6.6

Dear Client, I read "Experienced Blockchain Developer Needed" carefully and understand you want a messaging platform with fast, reliable real-time chat. My hands-on experience with PHP, Java, JavaScript, Node.js aligns directly with what you need. I've built chat apps with 1-on-1 and group messaging, media sharing, delivery/read receipts, push notifications and end-to-end security on backends that scale to heavy concurrent use. A few quick questions to get us started: 1. Do you need 1-on-1 chat only, or groups, channels and calls too? 2. Should it run on mobile, web, or both? 3. What user scale are you planning for at launch? Thanks & Regards, Deepak
₹200,000 INR in 21 days
6.0
6.0

As an experienced blockchain developer with over 6 years of experience, I've accomplished various projects involving smart contract development, zero-knowledge proof integration, and cross-chain payment infrastructure. My proficiency in Solidity, TypeScript, and JavaScript will be valuable for the deployment of your ConfidentialPayroll protocol. I have hands-on experience with EVM-compatible chains like Ethereum which is one of your requirements. Additionally, my knowledge about zero-knowledge proofs (ZKPs) and their application in creating privacy-preserving protocols aligns perfectly with your need to integrate ZK proof system into your platform. My understanding of Circle's CCTP and Hyperlane, and my experience with diverse backend orchestrators would be a great asset when implementing the cross-chain settlement mechanisms and building/maintaining the backend API orchestrator you need for your seven-stage payment pipeline. Given my expertise in blockchain development, comprehension of cryptography essentials, and adherence to security best practices, I can guarantee that the code I'll deliver would be secure, well-tested, well-documented and ready for production environments. Lastly, the fact that I'm used to working remotely in an asynchronous configuration makes me a strong candidate for this project. Let's discuss further how I can bring my skill set to give tangible value to
₹150,000 INR in 30 days
5.9
5.9

Hi! I’m Karthik. With over 15 years of software engineering experience—including deep expertise in advanced cryptography and production-grade blockchain protocols—I am perfectly positioned to take ownership of your ConfidentialPayroll infrastructure. Here is how my technical background aligns with your 7-stage payment pipeline: Smart Contract Architecture: Advanced mastery of Solidity (EVM) alongside Solana (Rust/Anchor) to build and deploy highly optimized, gas-efficient, and secure cross-chain contracts. Privacy Engineering (ZK & FHE): Proven hands-on experience integrating Zero-Knowledge Proof systems for transactional privacy and utilizing FHE frameworks (Zama/Fhenix) for secure, encrypted state management of sensitive payroll rosters. Cross-Chain Settlement: Deep expertise wiring up secure bridging frameworks, specifically leveraging Circle’s CCTP burn-and-mint mechanics and Hyperlane/Wormhole for automated, asynchronous cross-chain message passing. Robust Orchestration: Expert TypeScript/Express backend design to orchestrate complex multi-stage pipelines with strict fault tolerance, comprehensive testing, and strict security best practices. Let's hop on a chat to discuss your current architecture and timeline for the testnet deployment! Best regards, Karthik
₹249,000 INR in 7 days
5.6
5.6

As a seasoned blockchain developer with over 6 years of experience, I am confident in my ability to tackle the demands of your confidential payroll protocol head-on. In particular, my intimate familiarity with Solidity and EVM-compatible chains such as Ethereum, Base, Arbitrum, and Polygon align perfectly with your needs. Moreover, I am proficient in TypeScript and JavaScript for robust backend development using Node.js. Together these skills would enable me to not only design deploying smart contracts but also to integrate Zero-Knowledge Proof systems effectively for transaction privacy and compliance. In addition, I have an in-depth understanding of cross-chain messaging protocols which includes Hyperlane, Wormhole Cross-Chain Transfer Protocol (CCTP) and much more. My awareness of Circle CCTP attestations and burn-and-mint mechanics would prove useful in the implementation of your cross-chain settlement mechanisms. Moreover, my work is driven by passion. Since founding Solves Inn, I've built a reputation for delivering clean, scalable solutions that solve complex problems. I'm adept at transforming intricate ideas into high-impact digital products – a skill that would come handy as we collaborate on this project. Choose me for this project; choose expertise and passion.
₹150,000 INR in 10 days
5.3
5.3

Smart contract deployment with ZK proof integration and cross-chain routes is mainly about guarantees: privacy and atomicity, not just passing messages. I’ve built EVM smart contracts with ZK hooks (Groth16, SnarkJS) and integrated Hyperlane on a payment SaaS. Most experience is Solidity/Node.js/TypeScript—built 3 production payroll/payment flows last year, one with audited chain-bridge components. Solana/Rust: have shipped, less frequent but can scope new flows. Stack I’d use: Solidity (EVMs), Zero-Knowledge integration (Ligero/SnarkJS or your choice), Node.js (Express/TypeScript) as orchestrator, FHE via Zama (initial POC/prototype). Your CCTP/Hyperlane bridge will need separate attestation step, which I write as a modular node. Is the Solana component strictly required—full cross-chain on v1—or can we phase EVM first? That influences the plan. Pradeep
₹200,000 INR in 7 days
5.3
5.3

Hi , Good evening! I’ve carefully checked your requirements and really interested in this job. I’m full stack node.js developer working at large-scale apps as a lead developer with U.S. and European teams. I’m offering best quality and highest performance at lowest price. I can complete your project on time and your will experience great satisfaction with me. I’m well versed in React/Redux, Angular JS, Node JS, Ruby on Rails, html/css as well as javascript and jquery. I have rich experienced in Solidity, Smart Contracts, Software Architecture, Node.js, Java, PHP, JavaScript and Blockchain. For more information about me, please refer to my portfolios. I’m ready to discuss your project and start immediately. Looking forward to hearing you back and discussing all details.. Always happy to hear from you
₹222,000 INR in 3 days
4.6
4.6

With over six years of experience, including two hardworking years focused on blockchain development, I am well-prepared to help you build the core infrastructure for your ConfidentialPayroll protocol and integrate ZK proof systems for transaction privacy and compliance. My deep expertise in Solidity and experience with EVM-compatible chains such as Ethereum make me a perfect fit for developing and deploying smart contracts in production environments. Additionally, my strong proficiency in TypeScript/JavaScript is key for backend development using Node.js, which will be critical for our backend API orchestrator needs. I'm also well-versed with cross-chain messaging protocols like Hyperlane and CCTP and possess a good understanding of cryptography fundamentals which are both important aspects of this project. Lastly, my 'not only this' mindset is on full display here considering my extra skills such as Full Stack Web Development (which will bring a lot of value to the project) and SEO & Digital Growth know-how which will be vital once we go live with our protocol. I look forward to bringing my skills and passion to drive your project forward! Let's get started today!
₹200,000 INR in 7 days
3.9
3.9

With 6 years of blockchain development experience, I'm well-equipped to lead your smart contract development, ZK proof integration, and cross-chain payment pipeline. My past work includes deploying smart contracts on Ethereum and Solana, integrating zero-knowledge proof systems, and designing encrypted state management solutions. How do you envision balancing transaction privacy with scalability in this project? Regards, mundadiya
₹210,480 INR in 14 days
2.8
2.8

With a solid academic background in computer science and a PhD in Artificial Intelligence combined with my nearly two-decade-long career across academia, software engineering, and technology leadership, my expertise is primed to drive your blockchain project to success. In addition, I bring to the table a vast array of proficiencies including Java, JavaScript, Node.js, PHP and Software Architecture that can be leveraged strategically to meet your specific needs. In my role as the Chief Technology Officer for an AI startup, I successfully led end-to-end technical development and built multiple advanced digital products such as AI-powered voice and chat agents for customer support and machine learning-based analytics platforms. This experience speaks directly to your requirements regarding smart contract development, zero-knowledge proof integration, cross-chain payment pipeline building among others. Furthermore, my coding experience with Solidity and EVM compatible chains like Ethereum make me particularly well-suited to tackle the challenges inherent in integrating FHE libraries like Zama or Fhenix for encrypted state management.
₹150,000 INR in 7 days
2.3
2.3

I have experience developing blockchain-based applications, smart contracts, backend APIs, and secure Web3 solutions with a focus on scalability and reliability. I can help build and optimize your ConfidentialPayroll protocol with smart contract development, cross-chain payment workflows, privacy-focused integrations, and backend orchestration. My expertise includes Solidity, Ethereum-compatible networks, Node.js, TypeScript, API development, blockchain integrations, and secure application architecture. I can work on ZK proof integrations, cross-chain settlement mechanisms, encrypted data workflows, smart contract testing, deployment, and maintaining clean, well-documented infrastructure. My approach focuses on security, performance, and production-ready development while collaborating closely with your team on architecture and technical improvements. Let's discuss your protocol requirements and build a reliable blockchain payment infrastructure.
₹180,000 INR in 40 days
1.8
1.8

LET'S MAKE SURE YOU ONLY BUILD THIS ONCE. Developing a robust blockchain protocol involves navigating complex challenges, especially when it comes to smart contracts and cross-chain integrations. My approach would focus on ensuring seamless communication between Ethereum, Solana, and other VMs while implementing zero-knowledge proofs to enhance transaction privacy. By aligning closely with your team, we can craft a secure, efficient, and compliant infrastructure tailored to your ConfidentialPayroll protocol. With experience in Solidity and TypeScript, I prioritize writing well-tested code that meets the highest security standards. My commitment to strong communication and fast response times has earned me a 5-star rating from past clients, emphasizing my focus on long-term relationships. What aspects of your project do you feel could benefit from a different perspective? Best, Kurt
₹150,000 INR in 7 days
0.0
0.0

**Hello,** We are **Taksh IT Solutions Private Limited**, led by **Sachin Kumar**, with expertise in blockchain development, smart contracts, decentralized applications, and secure backend systems. Our team can help build and enhance your **ConfidentialPayroll protocol** with a strong focus on security, scalability, and privacy-preserving architecture. We can assist with: * Solidity smart contract development for EVM-compatible networks * Smart contract testing, auditing practices, and deployment * Cross-chain payment and settlement integrations * Backend API orchestration using Node.js/TypeScript * Secure blockchain transaction workflows * ZK proof integration and privacy-focused solutions * Web3 API integrations and wallet connectivity * Database and backend architecture for blockchain applications We understand the importance of secure infrastructure when working with confidential payroll, encrypted data, and multi-chain environments. Our approach focuses on clean code, proper documentation, testing, and scalable system design. We are comfortable working in remote, asynchronous environments and collaborating with existing engineering teams to deliver production-ready blockchain solutions. We would be happy to discuss your current architecture, protocol requirements, and roadmap to define the best technical approach. **Best Regards,** **Sachin Kumar** **Taksh IT Solutions Private Limited**
₹200,000 INR in 25 days
0.0
0.0

Chandigarh, India
Member since Jul 17, 2025
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