Cross-Platform Non-Custodial Crypto Wallet

@zeeshan5121472

Hi, after reviewing the requirements, I am interested in building this non custodial crypto wallet. I recommend Flutter for a performant cross platform iOS and Android application. I can implement secure on device key management, BIP 39 and BIP 44 HD wallets, biometric protection, encrypted storage, QR transactions, Bitcoin and Ethereum ERC 20 support, and a modular architecture for adding future assets. I will ensure private keys never reach the backend and include strong unit testing, CI, security review, and signed TestFlight and Google Play builds. For the MVP, I estimate 6 to 8 weeks, followed by security testing and store release preparation.

@mrresearcher99

Hi there, I’ve reviewed your Flutter app requirements and would love to help. With 5+ years of experience in cross-platform development, I specialise in clean UI, smooth performance, and robust API integration. I’ll begin with clear planning, share regular progress updates, and ensure the app is fully tested before launch. Let’s connect to discuss your vision — I’m ready to get started! Best, Bhargav Flutter Developer | Android & iOS Expert

@mahig47

Hello! As per your project post, you are looking to build a production grade non custodial crypto wallet for iOS and Android where private keys remain entirely on the user’s device. The app should provide a familiar payments style experience for sending and receiving crypto, while supporting Bitcoin, Ethereum and ERC 20 assets, transaction history, QR scanning, biometric protection, and secure wallet recovery. I can help build the wallet with a security first architecture covering HD wallet generation, encrypted local key storage, transaction signing, QR based transfers, blockchain data integration, biometric authentication, optional transaction approval verification, and secure backup and recovery workflows. The architecture will also be designed so additional blockchain networks and assets can be introduced without major changes to the core wallet. I specialize in cross platform mobile development, secure authentication, blockchain integrations, wallet workflows, API development, and production ready application architecture. I will also focus on comprehensive testing, clean documentation, CI workflows, and signed TestFlight and Google Play builds so your team can confidently maintain and extend the application. Let’s connect to discuss the supported networks, security model, and recovery workflow so we can build a secure, maintainable non custodial wallet without compromising the user experience. Best regards, Nikita Gupta

@shamimiceewu025

As an experienced web programmer, I understand the critical importance of creating a secure and user-friendly platform for my clients. In terms of key management, multi-chain integration and security auditing, you can trust that I will incorporate BIP-39/44 HD wallet generation, AES-256 encryption for storing keys and a zero-knowledge approach to ensure your users' private keys never touch my servers. Additionally, I will implement biometric authentication along with the option for two-factor authentication before approving transactions. When it comes to multi-chain integration, I'll utilize my deep knowledge in blockchain to integrate multiple currencies like Bitcoin and Ethereum/ERC-20 from day one. To ensure your project's success, I'll carry out thorough unit tests and implement basic CI so that new coins or features can be shipped with confidence. Being well-versed in handling signed builds for both iOS(TestFlight) and Android(Google Play), you won't face any issues during the release process. My hand-off documents will enable your team to seamlessly publish updates. Considering all of this, not only can I deliver a high-quality cross-platform non-custodial crypto wallet but I can do so within a realistic timeline for an MVP and public store releases. Let's make this project a reality together!

@mughiraaa

hi, i have reviewed the details of your project. i have solid experience building secure mobile and blockchain applications, and i understand that protecting private keys and keeping the wallet fully non custodial are the main priorities. i will build the wallet with react native, using secure device storage and encrypted key handling so private keys never reach the server. i will implement bip 39 and bip 44 wallet generation, biometric approval, backup and recovery, qr based transactions, and bitcoin and ethereum support with a structure that makes adding new assets easier. i will separate each blockchain integration cleanly, add unit tests and ci, and perform security focused testing around key storage, transaction signing, authentication, and recovery. i can target an mvp in around 6 to 8 weeks, followed by testing and preparation for testflight and google play release. can we schedule a quick meeting to discuss the project in detail. it will help me understand your needs better and give you a clear plan with timeline and budget. i will also share my portfolio during the chat. mughiraa

@NEHABHAT92

With over a decade in the web and mobile development industry, I’m Neha - ready to bring your vision of a robust, non-custodial crypto wallet to life. My team and I are well-versed in the ins and outs of cross-platform app development, and have a mastery over all major programming languages necessary for your project. You won’t have to worry about compatibility across devices or operating systems - we'll handle it with ease. In the realm of cryptocurrency, security is an absolute priority. Fortunately, this is an area of expertise for us. We're experienced at BIP-39/44 HD wallet generation and incorporating top-notch encryption standards like AES-256 to secure private keys within the user's device itself - always ensuring they remain completely private. We can add an optional two-factor authentication layer for added security. As for multi-chain integration, rest assured — we have worked on various projects entailing multiple digital assets in its architecture where new coins needed to be quickly added. Beyond development, we conduct thorough security audits on our codebases to ensure a guaranteed zero-knowledge approach even on your server. As far as the timeline goes, I propose a realistic plan that meticulously budgets time for key stages of development but also remains flexible in case readjustments are necessary. In conclusion, my seasoned technical skills coupled with a deep understanding of your needs makes me confident in delivering an MVP and subseque

@Web1devloper

Having spent over 8 years in the development field, I have honed my skills to tailor exactly what you need for this cross-platform non-custodial crypto wallet. As an experienced iOS and Flutter developer with a strong background in blockchain technology, I will build a production-grade application that adheres to industry security standards while delivering a seamless user experience. I have a deep understanding of BIP-39/44 HD wallet generation, AES-256 encryption and zero-knowledge approaches essential for data protection. My keen eye for detail ensures that your private keys will always stay on the user's device and are never exposed to third-party entities. I bring to the table an extensive knowledge of React Native and Flutter which will enable me to create efficient and maintainable codebases, optimized for speed and performance. Moreover, my skillset includes conducting effective security audits which will ensure that the app remains resilient against potential vulnerabilities. The addition of new currencies is never a roadblock as I can quickly integrate multi-chain support. In terms of key management, I implement robust biometric authentication along with optional two-factor authentication to provide an extra layer of security should users opt for it.

@johibkhan

Hi, As an accomplished software developer with over 15 years of experience, my goal aligns closely with your project: to create high-performing applications that prioritize user security, simplicity, and seamless functionality. I have extensive knowledge in various languages and frameworks including React Native, Flutter, and native development (Swift and Kotlin). Building upon this, I understand the importance of efficient coding, performance optimization, and scalable architectures—critical components for developing a non-custodial crypto wallet. Given my background in fintech and deep understanding of cryptocurrency security protocols (BIP-39/44 HD wallet generation and AES-256 encryption), I approach key management, multi-chain integration, and security auditing with utmost precision. Not only will I ensure a zero-knowledge approach, protecting sensitive data from ever touching your servers but also incorporate biometric authentication (Face ID / Touch ID / Android Biometrics) as you require. Additionally, I will implement optional two-factor authentication for users to approve transactions.

@danielboggs

Hello, I’m Daniel Boggs, a senior software architect with strong experience building secure, scalable applications and API-driven systems. Your non-custodial wallet requires security to be designed into the architecture from day one, and that is exactly how I would approach it. For key management, I’d use BIP-39/44 HD wallets with keys generated and retained exclusively on-device, encrypted at rest using platform-secure storage and strong encryption. Your backend would never receive private keys or seed phrases. Biometric authentication and transaction authorization would be enforced locally, with optional 2FA layered into the approval flow. For multi-chain support, I’d build a modular wallet/chain abstraction so Bitcoin, Ethereum/ERC-20, and future assets can be added without restructuring the core application. QR scanning, address management, transaction history, confirmations, and clear transaction states would be handled through clean reusable components. Security would include threat modeling, secure storage review, input validation, dependency auditing, transaction-signing review, and comprehensive testing before release. I’d also establish unit tests and CI from the beginning. Suggested timeline: MVP in approximately 3–4 weeks, followed by 1 week for hardening, testing, store builds, and release preparation. I’m available to discuss the architecture and begin immediately.

@ashinnd84

Hi, I would like to be considered for "Cross-Platform Non-Custodial Crypto Wallet". Blockchain is where I focus, and I take the security side of it seriously. How I would deliver it: 1. Nail down the exact on-chain behaviour and the trust assumptions before writing a line of contract code -- who can call what, and what happens when they should not be able to. 2. Write the contracts with a full test suite, including the failure paths, and deploy to a testnet you can poke at before anything touches mainnet. 3. Hand over verified source, deployment scripts and a short write-up of the known risks and gas trade-offs. Relevant to your listed skills: Android, Blockchain, Continuous Integration, Cryptocurrency, Flutter, iOS Development, Mobile App Development, MVP Development, React Native, Security Auditing. My bid is ₹63750 against your ₹37500-75000 range. Let's connect to discuss this further -- happy to talk through the approach and the security trade-offs before you decide. Thanks for reading. Best regards, Ashish & Team

@Visharaa2024

Hello, This is a strong fit for a security-first mobile architecture. I’d recommend React Native + TypeScript for the UI, with a dedicated secure/native layer for wallet generation, signing and key storage. Private keys and seed material would remain entirely on the user’s device and never be transmitted to the backend. I’d implement BIP-39/BIP-44 HD wallets, encrypted key storage, biometric protection and secure backup/import flows. For multi-chain support, I’d separate the wallet core from chain-specific adapters, supporting Bitcoin and Ethereum/ERC-20 initially while keeping the architecture extensible. Transaction signing would happen locally, with appropriate RPC/indexing services used for balances, history and broadcasting. I’d include unit tests, CI, transaction-state handling and security hardening throughout. For public launch, I’d also recommend an independent security audit rather than treating internal QA as a formal audit. I can take the project through wallet core, blockchain integration, testing, TestFlight/Google Play builds and documentation. Happy to review the exact network requirements and propose a realistic MVP timeline and cost. Best regards, Deepak

@Geetam00

As an experienced Full-Stack Developer adept in Continuous Integration and well-versed in using Flutter and React Native for Mobile App Development, I can definitely build the cross-platform non-custodial crypto wallet you desire. I understand that data security is of paramount importance in this project, which is why I gravitate towards a zero-knowledge approach in handling sensitive information. This translates into the use of technologies such as BIP-39/44 HD wallet generation and AES-256 encryption for key storage to ensure that private keys never leave the user’s device. My experience in both native (Swift+Kotlin) and cross-platform development (React Native, Flutter) enables me to adapt with ease to your needs and deliver performant solutions, guided by a commitment to maintainability. In addition to fulfilling the core features you've envisionsed such as QR scanning, multi-currency support, I'll implement important security features like biometric authentication and auditable passphrases. You can also depend on me for foolproof backup systems, two-factor authentication and straightforward processes for importing/exporting & verifying backups. Lastly, my familiarity with Continuous Integration means that new coins or features can be integrated seamlessly into the wallet with thorough testing via Unit Tests and Basic CI.