ph3About Our Client /h3pOne of our clients is building the next generation of integral finance. They're creating a mobile-first platform that makes moving, spending, and managing money across borders as simple as using a traditional bank account - while leveraging cutting-edge blockchain technology behind the scenes. Users enjoy a seamless experience without ever needing to understand crypto. /ppThe company already serves thousands of customers across 130+ countries and is rapidly expanding its presence in the US market. Having recently secured $5M in seed funding from leading international investors, they're well-funded and entering an exciting growth stage. /ppWith a lean, highly technical team, every engineer has a direct impact on both the product and the company's future. /ph3About the Role /h3pThis is a true founding engineering opportunity. You'll own major parts of the React Native application—from designing beautiful user interfaces to state management, API integrations, testing, and production releases. While React Native will be your primary focus, you'll work across the stack whenever needed. The team believes in shared ownership, giving everyone the opportunity to contribute wherever they can create the most value. If you love building polished consumer products and enjoy solving complex technical challenges, you'll feel right at home. /ph3What You'll Be Doing /h3ulliBuild and own major features of the React Native app end-to-end. /liliDevelop clean, scalable JavaScript and TypeScript code. /liliCollaborate closely with founders, product, and design teams to bring ideas to life. /liliDebug and solve complex issues across iOS, Android, APIs, and backend integrations. /liliOptimize performance, animations, responsiveness, and overall user experience.



/liliHelp establish engineering standards, architecture, and development best practices. /li /ulh3What We're Looking For /h3ulli5+ years of professional software engineering experience. /liliStrong experience building and shipping production React Native applications. /liliExpert-level JavaScript and TypeScript skills. /liliA product mindset and passion for delivering exceptional user experiences. /liliComfortable working in fast-moving startup environments with high ownership. /li /ulh3Nice to Have /h3ulliExperience building consumer-facing mobile products. /liliExpo, native modules, App Store releases, or mobile CI/CD. /liliBackend or full-stack experience (Node.js, APIs). /liliWeb3, blockchain, or Solidity experience (nice to have, not required). /liliPrevious experience at an early-stage startup. /liliExperience helping define engineering processes and technical standards. /li /ulh3Why You'll Love This Opportunity /h3ulliJoin as one of the company's first founding engineers. /liliBuild a product used by customers in 130+ countries. /liliWork directly with the founders and influence product direction. /liliOwn features from idea to production. /liliCreate a world-class mobile experience where every interaction matters. /liliMove fast, make decisions, and see your work shipped quickly. /liliHelp shape the engineering culture from the ground up. /li /ulh3Who Thrives Here /h3pThis role is perfect for engineers who love ownership, autonomy, and building products from the ground up. You'll thrive if you're someone who enjoys moving fast, wearing multiple hats, and shipping features that users genuinely love. Whether your background is in fintech, consumer apps, or Web3, what matters most is your ability to build great products and your excitement about solving meaningful problems. /p /p #J-18808-Ljbffr

📌 Senior React Native Engineer (Madrid)
🏢 OnHires
📍 Madrid