About CoinListCoinList is a leading crypto financial platform supporting the full lifecycle of crypto investment. We offer a comprehensive suite of services, including token sales, trading, lending, staking, and access to DeFi opportunities. CoinList has helped raise over $1.1 billion for groundbreaking projects, establishing itself as the go-to platform for innovative blockchain companies. Our platform is trusted by validators, miners, founders, crypto funds, and a broad array of crypto enthusiasts globally. The OpportunityWe’re looking for a Senior Software Engineer (Full Stack, Backend-leaning) to join our Core Team. You’ll play a key role in building and scaling the core financial infrastructure that powers CoinList’s money movement, wallet, and custody solutions, while also owning and improving our web application experience. This is a high-impact role where you’ll ship production systems, shape product direction, and help set technical standards for the team. This role is ideal for a full stack engineer (backend-leaning) who thrives in product-focused environments, cares deeply about UX and frontend polish, and is excited to own both backend infrastructure and web product experiences in a fast-paced fintech startup.What You’ll Do:<ul> <li>Design, build, and scale robust financial software systems and backend services that power money movement, custody, and payment flows.</li> <li>Develop and maintain web frontends (React, LiveView) with a focus on UX, collaborating closely with designers to deliver polished, user-friendly products.</li> <li>Architect and optimize wallet and custody solutions for a variety of cryptocurrencies, ensuring security, reliability, and scalability.</li> <li>Own projects end-to-end: From concept and design through implementation, testing, deployment, and monitoring.</li> <li>Collaborate cross-functionally with product, compliance, and other engineering teams to deliver secure and delightful financial products.</li> <li>Participate in code reviews, share knowledge, and help upskill junior engineers.</li> <li>Identify and address performance bottlenecks, reliability gaps, and opportunities for automation.</li> <li>Influence product and technical direction, working closely with leadership and crypto founders.</li> </ul><ul> <li>5+ years of professional engineering experience shipping high-quality code in production environments</li> <li>Strong coding fundamentals</li> <li>Proven experience scaling financial systems (fintech, payments, trading, or crypto/DeFi platforms).</li> <li>Security-first mindset and deep understanding of best practices in financial software development.</li> <li>Experience with, or open to learning and working with, Elixir and LiveView (backend and frontend).</li> <li>Demonstrated experience building and maintaining production web frontends (React, LiveView, or similar).</li> <li>Track record of product ownership, attention to detail, and working collaboratively with designers.</li> </ul>Bonus Skills:<ul> <li>Experience with distributed systems or microservices architecture.</li> <li>Prior Elixir experience is a plus but not required-willingness and ability to learn is key.</li> <li>Familiarity with blockchain protocols, crypto custody, or staking systems.</li> <li>Experience integrating with payment rails, ledgers, or compliance systems.</li> <li>Contributions to open-source projects or crypto communities.</li> <li>Backend engineering fundamentals with experience in modern languages (Elixir, Ruby, Go, TypeScript, Python, etc.).</li> </ul>Tech stack: <ul> <li>Elixir (primary), LiveView (frontend), Ruby. Most new development is in Elixir and LiveView.</li> <li>Legacy systems in Ruby on Rails and React.</li> </ul>