Senior Software Engineer - MetaMask Card

Ironwood Digital is the leading blockchain and web3 software company. Founded by Joe Lubin, CEO of Ironwood Digital and Co-Founder of Ethereum in 2014, Ironwood Digital has been at the forefront of innovation, pioneering technological developments within the web3 ecosystem. The financial system is being rebuilt on open, programmable infrastructure, and Ironwood Digital is helping power that transition. From MetaMask, the platform trusted by tens of millions of users worldwide, to Linea, the only 100% proven zkEVM rollup and an emerging home for institutional ETH capital, Ironwood Digital builds products and infrastructure that enable users, developers, and institutions to participate in the next generation of the internet. Our mission is to unlock the collaborative power of communities by making the decentralized web universally easy to access, use, and build on. Joining Ironwood Digital means working with a fully remote, globally distributed team of technologists, designers, cryptographers, product thinkers, and researchers who are building the next layer of the internet. You'll be exposed to new ideas, emerging technologies, and complex challenges that push you to stay at the top of your game while helping scale products and infrastructure used by tens of millions of users and thousands of developers across the web3 ecosystem. You'll join a network of builders that reaches the edge of our ecosystem. Ironwood Digital alumni have moved on to become tech entrepreneurs, CEOs, and team leads at tech companies. About Metamask MetaMask aims to create a thriving engineering organization that supports the well-being of our engineers while empowering them to do work they are proud of and enjoy. We strive for an environment that gives our people high trust and autonomy, while also facilitating collaboration, communication and camaraderie among teams and teammates. We aspire to build a diverse engineering team, inclusive to people from all backgrounds and demographics. It is also of great importance to us that working at MetaMask is an experience that catalyzes career growth and learning. What you'll do This role is specifically within the Card team, which is focused on the development and integration of the MetaMask Debit Card and related features directly into the MetaMask platform. As a Senior Software Engineer on this team, you will be instrumental in building the core infrastructure and user-facing features that enable millions of users to securely and intuitively manage and use their MetaMask Debit Card within their wallet. Specifically, you will be responsible for: Designing and implementing the front-end components and user experience for MetaMask Debit Card interactions across MetaMask clients. Developing robust and scalable backend services and APIs to manage card lifecycle, facilitate transaction processing, and integrate with financial partners. Ensuring seamless and secure integration with Card Issuers, payment networks, and compliance systems. Optimizing the performance and security of all Card features, handling real-time data feeds and high-volume transaction throughput. Requirements: 3+ years working with mobile-based technologies 3+ years building websites and/or applications Experience with React and React Native Strong knowledge of modern Javascript (ES6/TypeScript/etc.) Familiarity with blockchain fundamentals and Web3 integration Working knowledge of cross platform/browser compatibility Experience working with APIs and middleware services Experience working in an agile development team Experience developing applications with clean code practices, testing, and adherence to coding standards Understanding of web-based security considerations Bonus Points: Experience with payment processing, card issuing, or fintech products Experience with DeFi protocols and/or digital asset management Knowledge of financial products in the digital space Interest in blockchain technologies and Web3 Basic understanding of cryptography principles Experience working in distributed teams Previous experience working in Web3 Familiarity with the Web3 wallet ecosystem Experience with performance optimization Other skills to demonstrate: Good verbal and written communication in English Teamwork, flexibility, and organization Eagerness to learn and grow your technical skills Ability to balance technical quality with business needs and user experience Don't meet all the requirements? Don't sweat it. We’re passionate about building a diverse team of humans and as such, if you think you've got what it takes for our chaotic-but-fun, remote-friendly, start-up environment—apply anyway, detailing your relevant transferable skills in your cover letter. While we have a pretty good idea of what we need, we're ready for you to challenge our thinking on who needs to be in this role. It is a requirement of employment in this position that applicants will be required to submit to background checks including but not limited to employment, education and criminal record checks. Further de