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I want a clean, lightweight mobile wallet dedicated to Bitcoin only. The core job is to design and code an app that lets users create or import a BTC address, view their balance, send and receive coins, and track recent transactions in real time through reliable blockchain APIs. Security is non-negotiable. The first release must include two-factor authentication on every outbound transaction as well as on any sensitive settings screen. I’m happy to discuss SMS, email, or authenticator-app–based 2FA—choose whichever you can implement most robustly. I’m aiming for a straightforward user experience with optional room to grow: even though the initial scope covers Bitcoin exclusively, the architecture should be modular enough that I can add Ethereum, Litecoin, or other chains later without a full rewrite. Deliverables • Fully functional Android and iOS apps (React Native, Flutter, or native—open to your recommendation). • Secure backend or trusted third-party API integration for balance and UTXO handling. • Source code pushed to a private repo with clear build instructions. • Brief documentation outlining the 2FA flow and where additional coins could plug in. If you’ve shipped crypto wallets before and can point to code or live apps, let’s talk timelines and milestones.
Project ID: 40521127
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Active 6 days ago
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52 freelancers are bidding on average $7,476 AUD for this job

With almost a decade of experience in the industry and a strong footing in Android, Flutter, iOS Development, and more, I am ready to bring your dream Bitcoin Wallet App to life. My previous projects include over 400 mobile applications and 350 web applications, some of which include working with cryptocurrency. These experiences allow me to step into your project with the confidence and knowledge necessary to handle its intricacies skillfully. From designing a state-of-the-art user interface to ensuring the utmost security measures are in place, I intend to provide you with results that surpass your expectations. What sets me apart is my commitment not just to the task at hand but also to your long-term vision. Given my expertise, I understand the importance of creating an architecture that's modular enough for future expansions without requiring full rewrites. This insightful approach extends beyond mere development – it means meticulous documentation too. You can count on me for clear build instructions as well as a brief document outlining how additional coins could be easily integrated into the app.
$7,500 AUD in 45 days
9.4
9.4

As an experienced blockchain developer with a proven track record, I am confident that I can deliver the high-quality Bitcoin wallet app you're seeking. Not only have I successfully built and launched secure blockchains, but I also have extensive experience working with Bitcoin Core as well as other popular chains like Ethereum, Solana, and Polygon. Your emphasis on security aligns perfectly with my approach - it's non-negotiable when it comes to cryptocurrencies. I have previously developed comprehensive two-factor authentication systems for outbound transactions, which I believe will be crucial to include in your app. Moreover, my proficiency in both Android and iOS (using tools like React Native and native platforms) means that I can deliver fully-functional apps across multiple devices efficiently and effectively. Lastly, the emphasis placed on room for growth drew me to your project. Modular architecture is something I've worked extensively with. Thus, I am confident that not only will the initial release of the app meet your requirements but it will also provide a solid foundation for any potential expansions into other chains you may pursue in future. Altogether, my cumulative skills make me an ideal fit for your Bitcoin wallet app project. I'm eager to collaborate closely with you to create a cutting-edge solution tailored specifically to your needs.
$8,500 AUD in 60 days
9.4
9.4

Hello We are Ominfowave Software Services Pvt. Ltd., and we have an expert mobile application development team with 10+ years of experience in building reliable, high-quality apps. ? Our Core Expertise •Android App Development (Kotlin / Native) •iOS App Development •Flutter & FlutterFlow (Cross-platform) Our team understands not just development, but also performance, user experience, scalability, and timely delivery. ? What We Can Deliver ✔ Social media integrations (Facebook, Google, Twitter, etc.) ✔ Google APIs (Maps, Places, FCM, YouTube, Analytics) ✔ Offline & cloud database solutions (SQLite, MySQL, Realtime DB) ✔ Secure payment integrations (Stripe, PayPal, Braintree) ✔ Ad monetization (AdMob, Appodeal, MobVista) ✔ In-App Purchases ✔ Location tracking & real-time features ✔ Chat & messaging applications ? App Types We’ve Built •Social Media Apps •Shopping & eCommerce Apps •Job Portals •Taxi / Carpooling Apps •VPN & Utility Apps •Travel & Booking Apps •Live Streaming Apps •AI & Machine Learning–based Apps ? Why Work With Us •10+ years of hands-on experience •Clean, scalable & secure code • Clear communication & regular updates • On-time delivery with quality assurance • Long-term support after project completion We would love to work with you and build a long-term, trusted business relationship. Let’s discuss your idea and turn it into a successful application Warm regards, Vishal Nasit Ominfowave Software Services Pvt. Ltd.
$5,000 AUD in 25 days
8.5
8.5

Hi there, I see you need a secure, Bitcoin-only mobile wallet. This means on-device private key management, client-side transaction signing, and fetching balances/history via a blockchain API. Every outbound transaction must pass a 2FA check before being broadcast, giving the user full control of their funds. Technical approach: I recommend Flutter for a unified iOS/Android app. Private keys will be isolated in the device's secure enclave. For blockchain data, we can leverage a reliable public API like Blockstream's Esplora. The architecture will use a CoinService interface to ensure adding ETH/LTC later is a modular task. Core modules: Wallet Core (BIP39 key generation/import/storage), Transaction Engine (UTXO management, client-side signing), Security Layer (TOTP 2FA for sending), and a Blockchain Sync module for real-time data. Relevant systems: We developed SecureCom, a Flutter app with 512-bit ECC for E2E encrypted messaging. This background in mobile app security and on-device cryptography is directly transferable to building a secure, non-custodial crypto wallet. Implementation strategy: We'll start with a testnet-ready wallet focusing on secure key management and signing. Next, we'll build the 2FA flow and API integration. The modular architecture will be prioritized from the start to guarantee future multi-coin support is seamless. Regards, Rohit
$5,000 AUD in 45 days
8.4
8.4

Hello, I've reviewed your requirement and understand that you need a secure Bitcoin-only wallet for iOS and Android with wallet creation/import, real-time balance tracking, send/receive functionality, transaction history, and mandatory 2FA protection for all outbound transactions and sensitive account actions. We can build this using Flutter or React Native with a modular architecture, secure key management, blockchain API integration, biometric authentication, and authenticator-based 2FA, while keeping the foundation ready for future support of Ethereum, Litecoin, and additional cryptocurrencies. The solution will include mobile apps, backend/API integration, source code repository, build documentation, security documentation, and a scalable wallet architecture designed for future blockchain expansion. Could you please confirm whether you prefer a fully non-custodial wallet where users control their seed phrases and private keys, or a hybrid model with optional account recovery features? Ping me to discuss the security architecture, milestones, and timeline. Thanks!
$5,100 AUD in 32 days
7.9
7.9

Hello, I am interested in developing your Bitcoin wallet application. With 10+ years of experience in mobile and web application development, including React Native, Flutter, Node.js, PHP, Laravel, and secure financial platforms, I can deliver a production-ready wallet for both Android and iOS. I recommend Flutter for a single high-performance codebase and a Node.js backend integrated with trusted blockchain providers for balance retrieval, transaction broadcasting, and UTXO management. The application will support wallet creation/import, real-time balance updates, transaction history, QR-based send/receive functionality, and mandatory 2FA for outbound transactions and security-sensitive actions using authenticator-based verification for maximum security. The architecture will be modular, allowing future support for Ethereum, Litecoin, and additional chains without major restructuring. I will provide clean source code, documentation, deployment guidance, and a well-documented security workflow. I would be happy to discuss milestones, timeline, and technical architecture in detail. Best regards
$5,000 AUD in 7 days
7.1
7.1

Hi, I’m excited about building this Bitcoin wallet app with you. I have extensive experience in creating secure, user-friendly crypto wallets on both iOS and Android platforms using Flutter, which offers excellent cross-platform capabilities and modular architecture for future expansion. I understand the importance of robust security, especially with 2FA for transactions and settings, and I can implement authenticator-app-based 2FA seamlessly. For balance and UTXO management, I recommend integrating trusted third-party APIs known for reliability and real-time updates, ensuring smooth and accurate transaction tracking. I will also set up a clear, modular backend structure to allow easy addition of other cryptocurrencies later. The project will include detailed documentation on the 2FA process and future coin integration points, with source code stored securely in a private repository. I’d love to discuss your preferred API options and specific UI/UX expectations to tailor the app perfectly. Best, Justin
$7,500 AUD in 7 days
6.5
6.5

In the realm of modern innovations and complex technologies, building a Bitcoin wallet as you've described requires a trusted partner skilled not just in the tech but also in ensuring security right from the app design. With over a decade of experience in Full Stack and Mobile App development, I'm confident in my ability to produce an exceptional, lightweight yet robust Bitcoin wallet app for both Android and iOS. Beyond coding beautifully designed and responsive apps with your chosen technology stack (including React Native), I have hands-on experience in secure backend and API integration which is vital given the nature of this project. My previous work includes projects dealing with cryptocurrency like yours. Refactoring, extensive testing is part of my forte, which will impact the deliverables Furthermore, I recognize future scalability as one of your key requirements. By applying modular methods within the architecture, adding cryptocurrencies like Ethereum or Litecoin will be less reliant on time-consuming rewrites. Alongside an efficient UTXO handling system, comprehensive documentation is guaranteed; assisting you with smoothapp upgrades or maintenance whenever necessary. My dedication to long-term support ensures you can rely on my assistance even after project completion.
$7,500 AUD in 7 days
6.4
6.4

Hi I will be able to help you. Please message me so that we will have detail technical discussion. I have 9+ years of combined experience in Mobile Application development, Website development, Desktop application development, 3rd party Artificial Intelligence api, AR/ VR, Chatbot, Blockchain- Cryptocurrency, CRM & ERP, Game Development and any other Software development. I am having expertise in Native on Android Java, kotlin and IOS Swift, and For Hybrid Cross platform on Flutter Dart & React- Native and for web and backend on react js and node js, Python Django. Please consider me and initiate a chat for further detailed discussion. Regards, Anju Logical Soft Tech Pvt Ltd, Indore(M.P)
$7,500 AUD in 50 days
6.6
6.6

I can build a clean, lightweight Bitcoin-only wallet app for Android and iOS, focused on secure, easy handling of BTC addresses, balances, and transactions. I've helped clients in fintech launch wallet features that rely on real-time blockchain APIs and handled two-factor authentication via authenticator apps for secure outbound transactions and settings. To keep things modular for future coin additions like Ethereum or Litecoin, I’ll design the app with a clear wallet abstraction layer. For 2FA, I suggest using an authenticator app method to avoid SMS reliability issues, but can adjust based on your preference. Would you prefer Flutter or React Native for faster cross-platform delivery, or do you want native for optimal performance? Also, do you have a preferred blockchain API provider for UTXO tracking, or should I recommend a robust option like Blockstream’s API? I’ll deliver the full source with build guides and concise 2FA and extension docs, so you can add coins easily later on. Ready to start as soon as you’re set.
$10,000 AUD in 7 days
6.0
6.0

Hi, I am specialized in blockchain development, we can build a wallet app based on api for data or sync locally, I willl use flutter to build 1 app for both ios and android, the wallwt will make use of 2fa as per choice for the user(multiple options) Lets chat to see what fits best for the rest.
$7,500 AUD in 31 days
5.6
5.6

Hi, I read your project "Bitcoin Wallet App Build" and I can help with it. I would focus on responsive front-end work and clean component structure. I noticed the relevant skills include PHP Mobile App Development iPhone Android Blockchain iOS Development React Native Flutter. My approach: 1. Review the current setup and confirm the exact requirements. 2. Implement the requested work in a clean, maintainable way. 3. Test the result and provide a clear handover with any setup notes needed. Clarification questions: 1. Which external services, APIs, or payment gateways need to be connected, and will test credentials be available? 2. What backend structure, database, user roles, and admin access should the implementation support? 3. Are there any infrastructure, security, scalability, or maintenance constraints I should follow? Best regards
$7,500 AUD in 7 days
5.1
5.1

I understand that security, reliability, and future extensibility are the most critical aspects of this project. I can build a Bitcoin-only wallet application using Flutter for iOS and Android, with secure wallet creation/import, real-time balance and transaction monitoring, QR-based send/receive flows, and robust 2FA protection for transactions and sensitive account actions. The architecture will be modular and blockchain-agnostic, making future support for Ethereum, Litecoin, and additional assets straightforward. I will focus on secure key management, encrypted storage, clean UX, API reliability, comprehensive testing, and detailed documentation to ensure a production-ready release.
$5,500 AUD in 56 days
4.8
4.8

Hi, I can help you build a clean, secure Bitcoin-only mobile wallet for both iOS and Android with a lightweight user experience and scalable architecture for future multi-chain support. I recommend Flutter or React Native for faster cross-platform delivery, with secure blockchain API integration for BTC balance, UTXO handling, sending, receiving, and transaction history. Key features: • Create/import BTC wallet/address • View real-time BTC balance • Send and receive Bitcoin • Recent transaction tracking • QR code receive/share flow • 2FA for outbound transactions and sensitive settings • Secure API integration for blockchain data • Modular structure for adding ETH, LTC, or other chains later Security approach: • Secure local key storage • Encrypted sensitive data • 2FA via authenticator app/email/SMS based on final preference • Transaction confirmation before broadcast • Clean separation between wallet logic, API layer, and UI Deliverables: • iOS and Android apps • Source code in private repo • Build instructions • 2FA flow documentation • Notes for future coin integrations I have 13+ years of mobile app development experience and have worked with fintech, payments, secure authentication, and API-based transaction systems. Estimated timeline: 6–8 weeks depending on final security flow and API/provider choice. Best regards, Parveen Tyagi
$8,500 AUD in 60 days
4.4
4.4

Hi there, I have 5 years of mobile app development experience and have built secure fintech and wallet-style apps in Flutter with encrypted local storage, biometric auth, and third-party financial API integrations — the architecture principles for a Bitcoin wallet map directly onto work I have already shipped. For this project I would use Flutter for Android and iOS from a single codebase, keeping your budget efficient without sacrificing performance. Bitcoin core logic via the bitcoin_flutter and bip39 packages for wallet creation and import, BlockCypher or Blockstream API for real-time balance and transaction data, and TOTP-based authenticator app 2FA for outbound transactions and sensitive screens — more robust than SMS and works fully offline. Private keys never leave the device. All sensitive data encrypted with flutter_secure_storage. The architecture will be coin-agnostic from day one — each chain plugs in as a separate module so adding Ethereum or Litecoin later requires no rewrites to the core wallet logic. Deliverables: Android and iOS apps, private GitHub repo with clean commits and build instructions, 2FA flow documentation, and a modular coin-addition guide. Timeline: 6 to 8 weeks Investment: open to discussion based on your budget and milestone structure A couple of quick questions: Should the wallet be fully non-custodial, or are you open to a custodial backend? Testnet first for QA, then mainnet for release — does that work for you? Best regards, Vinod
$7,500 AUD in 7 days
2.8
2.8

As a seasoned full-stack developer with a strong focus on mobile app development, blockchains, and AI/ML integration, I believe I bring some incredibly valuable skills to the table for your Bitcoin wallet project. First and foremost, my expertise in Android and iOS development using technologies like React Native and Flutter ensures that you'll receive fully functional, lightweight apps for both platforms. Moreover, given your security requirement for two-factor authentication and the potential to expand to other cryptocurrencies in the future, my substantial experience in blockchain technology becomes relevant. I've executed similar projects before with an emphasis on security measures. Combining this with my fluency in popular backend options like PHP, I can either build a secure backend for you or ensure seamless integration with trusted third-party APIs if that aligns better with your vision. Finally, I excel at creating modular architectures that allow for easy scalability. You mentioned your desire to maintain room for future inclusion of Ethereum, Litecoin, or any other blockchain - I completely understand this need. My skillset is built around developing extensible systems that are easy to build upon without necessitating a disruptive "start from scratch" approach hence accelerating future development speed. Let’s turn this project into a reality by building an intuitive Bitcoin wallet app that keeps users secure while meeting their everyday cryptocurrency needs!
$5,000 AUD in 7 days
2.7
2.7

Hi, good day. Building a secure Bitcoin-only mobile wallet is a high-sensitivity project where the main challenge is not just functionality but cryptographic security, key management, and transaction safety under threat conditions. I would approach this using Flutter or React Native with a hardened native crypto layer, integrating a trusted Bitcoin library (e.g., bitcoinjs-lib / BTCPay-style backend services or direct node integration via Electrum or Bitcoin Core APIs) for UTXO management and real-time transaction tracking. For security, I would implement encrypted key storage using Secure Enclave/Keystore, strict transaction signing on-device, and 2FA for outbound transactions via authenticator apps (TOTP) rather than SMS for stronger resistance to SIM-swap attacks. The backend would remain minimal and non-custodial, focusing only on blockchain indexing, mempool tracking, and push notifications, ensuring the architecture stays modular for future multi-chain expansion. I have experience designing wallet-like secure flows and API-driven fintech systems, and I would prioritize auditability, fail-safe signing flows, and clean extensible architecture from day one.
$6,000 AUD in 7 days
1.2
1.2

Hello, I have reviewed your requirements and understand that you need a clean, lightweight Bitcoin-only mobile wallet for Android and iOS with core features like wallet creation/import, balance tracking, sending/receiving BTC, and real-time transaction updates. I can help you design and develop a secure and scalable wallet application with a strong focus on security, including two-factor authentication for sensitive actions, while ensuring a smooth and intuitive user experience. I would be happy to discuss the preferred tech stack, API integration approach, and overall architecture so we can build a modular solution that can be extended to support additional cryptocurrencies in the future without major redesign. Looking forward to connecting with you. Thanks
$7,000 AUD in 30 days
1.0
1.0

The single biggest risk for a Bitcoin-only wallet is key and transaction control. Requiring 2FA on every outbound transaction and on sensitive settings is the right call, but if private keys or the signing flow are mishandled the 2FA becomes theatrical. I’ll treat keys as device-first, never transmitted, and make 2FA an unlock step for signing so a stolen backend cannot move funds. Approach: build a React Native app (fast cross-platform delivery and reuse of native secure keystore/Keychain) with a small secure backend option. Key points: - Local encrypted keystore using device secure enclave / Android Keystore + optional user passphrase; biometric+PIN for day-to-day access. - 2FA implemented as TOTP (authenticator app) as primary, with optional email fallback. TOTP will be required to approve any outbound TX and to change sensitive settings. - Transaction flow: construct and display unsigned TX client-side, require TOTP unlock to sign locally, then push to network via chosen provider. - Blockchain connectivity: for MVP I recommend Blockstream’s API for reliability and speed. If you prefer privacy and long-term control I will deploy an ElectrumX/Bitcoin Core backend instead. The architecture will include chain adapters so adding Ethereum or Litecoin later is a matter of writing a new adapter, not a rewrite. Deliverables: iOS + Android (React Native), secure backend or API integration, private repo with build instructions, and short docs covering 2FA flow and how to add chains. Relevant work: ReThinkology is a React Native mobile app I shipped to iOS and Android with secure auth flows and a Django backend. That experience maps directly to wallet UX, background sync, push notifications, and release pipelines. Estimated timeline for MVP: 8–12 weeks depending on backend choice. Proposed budget: 7,500 AUD. Do you prefer authenticator TOTP as the primary 2FA, and would you like a hosted API (Blockstream) for the MVP or a self-hosted ElectrumX/Bitcoin Core stack? Also, do you have designs or a Figma file I can review?
$7,500 AUD in 7 days
0.0
0.0

Hi, I've been building mobile apps for close to 5 years, mostly with React Native, and quite a bit of that work involved secure auth flows, real-time data syncing, and modular architecture — all things this project leans on heavily. A Bitcoin-only wallet with room to add other chains later is a smart way to scope this. Here's how I'd build it: Stack: React Native for one codebase across iOS and Android Blockchain API (BlockCypher or similar) for balance, UTXO handling, and live transaction history TOTP-based 2FA (Google Authenticator/Authy) — more reliable than SMS, no carrier dependency Modular wallet architecture so adding ETH or LTC later is a plug-in, not a rewrite Private keys stored locally in device keychain/keystore, never on a server Rough plan: Week 1 — Wallet creation/import, key storage Week 2 — Balance, send/receive, transaction history Week 3 — 2FA on transactions and settings Week 4 — Testing, security pass, docs, handoff I'll be upfront — most of my shipped apps have been social and utility platforms with Firebase backends and secure auth, not crypto-specific wallets. The core skills transfer directly, but I want to be honest rather than overstate it.
$7,500 AUD in 7 days
0.0
0.0

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