Mobile Crypto Wallet & POS Development

@C0RETECHIES

Hi, The system operates as a hybrid non-custodial wallet and retail POS node tailored for a custom Rupiah token. Users manage local keys, broadcast transfers via custom RPC bridges, and interact directly with on-chain swap contracts. The merchant terminal dynamically generates QR/NFC invoices while polling the RPC for on-chain settlement. Technical approach: We will build this in Flutter, integrating Web3 libraries for blockchain interactions. Key management will strictly utilize iOS Keychain and Android Keystore with biometric gating. A Node.js relayer backend will handle custom RPC polling, gas estimation, and broadcasting to your BEP-20 contract. Core modules: Local key derivation; transaction broadcast engine; on-device swap router executing on-chain liquidity mapping; and a merchant POS workflow processing QR/NFC handshakes and real-time payment ledger polling. Relevant systems: - Bison360 (Custom retail POS, offline-sync architecture) - SecureCom (Advanced ECC encryption and local keystore security) - ZappStore (QR-based merchant checkouts) Implementation strategy: We start with the secure keystore and send/receive MVP. Phase two builds the RPC bridge for balance resolution. We then wire the on-chain swap logic, followed by the POS module and TestFlight/APK rollouts. 1. Are token swaps routed through a custom contract, or bridged to an existing AMM? 2. Does the POS need fiat conversion displays, or operate purely in token denominations? 3. Do you have a preferred hardware wallet SDK for the pairing requirement? Regards, Rohit

@DrSyafiq

This is a strong fit, and I’d start with the highest-risk workflow first. For a Mobile Crypto Wallet & POS Development, the key is not just the screens but keeping the API and platform-specific behavior stable across devices. My approach would be to first separate the real-time engine, wallet ledger, and admin controls, then prove latency and transaction safety before adding broader UI polish. Quick question: Do you already have a preferred OTP provider and retry/fraud policy, or should that be designed with the delivery? Also, do you already have the API and screen designs, or should the first milestone define the end-to-end mobile flow? Best, Dr. Syafiq

@mubeenm5026

With over a decade of experience in software development, Web Crest brings the expertise and agility needed to deliver your demanding project. As expressed in your description, security is paramount for such a delicate endeavor - we are well-versed in best-practice key management and implementing audited open-source libraries that provide peace-of-mind. In addition to this, our hands-on experience with mobile development, specifically using Flutter and React Native makes us an ideal fit for your iOS and Android requirements. It's worth mentioning that we also possess proficiency in Kotlin and Swift. What sets us apart from the competition is our extensive array of capabilities, which includes blockchain and smart contract development. We have previously integrated Ethereum and BNB Smart Chain wallets with various front-end applications, proving our ability to work with custom RPC endpoints, bridges, balance look-ups, etc. Real-time functionality plays a significant role in your project; our previous projects successfully working on similar constructs make us confident in delivering seamless API or SDK documentation and clear invoices. Collaboration is key to any successful endeavor. Working with us ensures you a committed and talented team that delivers on-time, every time without compromising quality.

@ZohaibRoy

⭐⭐⭐⭐⭐ Secure Crypto Wallet & POS App for Rupiah Token (iOS & Android) ❇️ Hi My Friend, I hope you are doing well. I checked all of your project requirements and I can see you are looking for a complete mobile crypto wallet with swap and POS. You have no need to look any further as Zohaib is here to help you! My team is already doing 50+ similar projects for cross‑platform crypto wallets. I will build a Flutter app with native‑feel UI, integrate encrypted keystore, biometric unlock and optional hardware‑wallet pairing. I will also add a swap engine and a light POS screen, all from the same code‑base, at no extra cost. ➡️ Why Me? I can easily do your wallet as I have 5 years of experience in Flutter, React Native, Kotlin, Swift, blockchain SDKs, security. Not only this, I have a strong grip on Solidity, BEP‑20 bridges, API design and POS integration. ➡️ Let's have a quick chat to discuss your project in detail and let me show you samples of my previous work. Looking forward to discussing with you in chat. ➡️ Skills & Experience: ✅ Flutter ✅ React Native ✅ Kotlin ✅ Swift ✅ Blockchain SDKs ✅ Solidity ✅ BEP‑20 Bridges ✅ Secure Keystore ✅ Biometric Auth ✅ POS Development ✅ API Design ✅ Crypto Security Waiting for your response! Best Regards, Zohaib

@CANWS

Hi, I’m Mayank, a Full-Stack & Flutter developer with 12+ years of experience. I can build the wallet/POS ecosystem with Flutter + secure backend APIs, covering multi-asset balances, send/receive, transaction history, swaps, merchant POS, QR payments, and your custom Rupiah-token RPC/bridge. I’ll prioritize encrypted key storage, biometrics, secure signing, audited libraries, and clear transaction verification. For the architecture, I’d first review your token contract and node/RPC documentation before finalizing the chain and swap implementation. Timeline: ~6 weeks to production MVP and store submission. One point I want to be transparent about: I don’t have a verified live crypto-wallet project in the portfolio examples you’ve provided, so I wouldn’t claim one. I can instead demonstrate relevant Flutter, payment, API, and secure application work and map that experience to the wallet architecture. Thanks

@santoshkumars17

With over half a decade of professional experience in the realms of web and mobile app development, I am confident in my ability to craft the secure, user-friendly mobile crypto wallet and POS system that you need. You demand some truly cutting-edge functionalities for your app and I believe my skillset is uniquely tailored to deliver precisely that. In terms of frontend development, I have an excellent grip on technologies like React Native and Flutter which would be key in maintaining the desired native feel for your app. In addition, as a full stack developer, I boast ample expertise in backend engineering using technologies like Node.js and Laravel among others. This will come in handy when it comes to implementing features such as encrypted local keystore or server-side components like balance look-ups and fee estimation utilizing custom RPC endpoints or bridges for your Rupiah-based tokens. Moreover, although not specified within your project description, I have hands-on experience with creating retail crypto POS systems which implies a good understanding of business continuity requirements within payments which should help accelerate & streamline our process together. My sedulous work ethic combined with a passion for impactful coding makes me a strong candidate to provide you with effectively engineered crypto-wallet solution from conception to deployment. Let's work together on turning your idea into reality!

@UzeeTech

A production-ready wallet with merchant payments is ambitious for the budget, so I would propose we start with a focused Phase 1 — this bid covers that first milestone: the core mobile wallet for iOS and Android. Phase 1 would be a Flutter app with wallet creation and import, Rupiah token send and receive, live balance via the token contract or RPC, and QR-code payments, plus hardened security around key storage. Once that is stable, Phase 2 adds the merchant POS flow and dashboard, quoted separately after scope confirmation. I built Jyotish AI, a live product on Android and web, so I have shipped real mobile apps end to end — store submission, updates, and API integration. I also have an AI website-generation platform in development, so I am comfortable wiring apps to blockchain backends and custom APIs cleanly. Two questions: is the Rupiah token deployed on an EVM-compatible chain or a custom network, and is the contract plus RPC documentation ready to share? And do you need both iOS and Android stores in Phase 1, or is Android-first acceptable? If the token docs are available, I can start immediately. Let me know how you want to phase it.

@karimrattani

Hello, I can develop your iOS/Android crypto wallet and merchant POS using Flutter, with a security-first architecture and support for your custom Rupiah token. ✅ Flutter + Dart for native-feeling iOS & Android ✅ Secure wallet creation, encrypted keystore & biometric unlock ✅ Send/receive assets with balances and immutable transaction history ✅ Custom RPC integration for balance, fees & on-chain broadcasting ✅ Multi-asset wallet with on-chain swap flow and TxID confirmation ✅ Merchant POS with dynamic QR/NFC invoices & real-time payment status ✅ Optional hardware-wallet integration ✅ Clean backend/API layer with SDK documentation ✅ Security-focused implementation, testing & build documentation Recommended Stack: Flutter + secure native key storage, custom RPC/backend services, and audited open-source blockchain libraries where appropriate. I’ll first validate the token contract, RPC requirements and custody model, then build the wallet, swap and POS modules around that architecture. Relevant wallet/blockchain work can be discussed and shared during the conversation. Best Regards, CREOMIND DESIGNS INC.

@ApieTech

A non-custodial wallet for a Rupiah-denominated token - send, receive, immutable history - plus an on-device swap and a merchant POS mode, from one Flutter codebase. On key management, the part that matters most: private keys generated on-device and never leaving it, stored in the Secure Enclave on iOS and the hardware-backed Keystore on Android, with biometric unlock gating signing rather than merely gating the screen. Seed phrase shown once at setup with verified backup. We would not build a flow where the key, seed or an unencrypted backup can reach your servers - if it can, a server breach becomes a loss of user funds, and that is not recoverable. The swap needs slippage tolerance and a quote expiry, with the quote re-validated at broadcast. Without that, a user approves one rate and settles at another, which is the single most common complaint on wallet swaps. POS mode: merchant-side needs a clear confirmed-versus-pending distinction tied to actual confirmations, not just a broadcast receipt. Releasing goods on an unconfirmed transaction is how merchants get burned. We have built in this space - a crypto trading platform for BrightFunded - and blockchain is one of our verticals. Flutter and Node are core. Team of 20. Two questions: which chain is the Rupiah token issued on, and is a third-party security audit in scope before launch? For a wallet holding real value we would recommend one, and we would rather raise it now than at handover. - APIE Technologies

@BZagarell

You need a production-ready mobile crypto wallet for iOS and Android that holds Rupiah-based assets, supports send and receive with immutable transaction history, includes an on-device swap engine for exchanging the Rupiah token against other coins, and adds a merchant POS module for tablet or phone checkout with dynamic invoices. My approach: build in Flutter for a native-feeling single codebase, with key management handled properly from day one, meaning encrypted local keystore, biometric unlock, and optional hardware wallet pairing, using audited open-source libraries rather than custom cryptography. Because your asset is a Rupiah token rather than a mainstream chain coin, I'd design the backend layer around your contract's actual requirements, exposing custom RPC endpoints or bridges for balance lookups, fee estimation, and on-chain broadcasting once I've reviewed your node access and technical docs. The swap engine would execute and settle on-chain with a returned TxID, and the POS module would generate dynamic QR or NFC invoices with real-time payment status, which is where retail crypto systems usually fail if confirmation handling isn't built carefully. I'd deliver TestFlight and APK builds, clean commented source with build instructions, SDK documentation, and a brief security report covering the measures implemented.