Senior / Staff Software Engineer (Backend)

<p>We simplify Bitcoin. Founded in 2021 in Salzburg, we’re a leading Bitcoin investment platform that aims to help people trust themselves enough to build their financial freedom — with Bitcoin.</p> <p>In 2023, the German Volksbank Raiffeisenbank Bayern Mitte acquired a stake in 21bitcoin to help build the Bitcoin financial platform of the future.</p> <p>So if you’re someone who thinks big, moves fast and wants to make an impact right from day one, then get ready to join our industry-changing team. Let’s go!</p> <p><strong>👋 The Role</strong></p> <p>As a <strong>Senior /</strong> <strong>Staff Software Engineer (Backend)</strong>, your mission is to take full co-ownership of rewriting and re-architecting our backend systems using state-of-the-art technologies. This isn’t just about improving the current stack — it’s about redefining what’s possible and setting new benchmarks for technical standards that will serve as the foundation for our growth.</p> <p>We’re a lean, ambitious startup of around 21 people with a senior engineering team. This role isn’t currently about managing others — it’s about owning challenges, pushing boundaries, and delivering a world-class backend that empowers our team to scale quickly and confidently.</p> <h2 id="tasks">Tasks</h2> <p><strong>🚀 Your Mission</strong></p> <p>As a Senior / Staff Software Engineer (Backend), you will:</p> <ul> <li><strong>Rebuild the Core:</strong> Rewrite and modernize our backend using <strong>TypeScript / Go</strong> and other cutting-edge technologies, ensuring it’s robust, scalable, and future-proof. This backend will serve as the cornerstone for future growth.</li> <li><strong>Challenge the Status Quo:</strong> Identify and replace outdated implementations, tools, and processes with innovative, high-performance solutions that align with the highest professional standards.</li> <li><strong>Own End-to-End Delivery:</strong> Take full responsibility for designing, implementing, and deploying backend systems that prioritize quality, maintainability, and scalability.</li> <li><strong>Drive Technical Excellence:</strong> Push for clean, modular code, seamless integrations, and optimal architecture, ensuring our backend sets a new benchmark for the team’s velocity and success.</li> <li><strong>Foster a Culture of Innovation:</strong> Collaborate with a highly skilled team to solve complex technical challenges, share knowledge, and continuously raise the bar for engineering excellence.</li> </ul> <p><strong>🎯 What Success Looks Like</strong></p> <ul> <li>Backend systems are <strong>highly scalable</strong>, <strong>reliable</strong>, and <strong>easy to maintain</strong>, supporting the foundation that supports the company’s long-term growth and scalability goals.</li> <li>Development teams deliver features <strong>faster, more efficient and more reliable</strong> and greater confidence, thanks to efficient processes and technical standards.</li> <li>Clear coding practices and best-in-class tools are adopted across the engineering team.</li> <li>The engineering team thrives on responsibility, collaboration, and a shared commitment to professional, high-quality standards.</li> </ul> <h2 id="requirements">Requirements</h2> <p><strong>🛠️ Your Toolbox</strong></p> <ul> <li><strong>Languages &amp; Frameworks:</strong> TypeScript, Go, NestJS, GraphQL</li> <li><strong>Databases:</strong> PostgreSQL, DynamoDB</li> <li><strong>Infrastructure:</strong> Serverless (CDK, Terraform), Fargate, Docker</li> <li><strong>Messaging &amp; Streams:</strong> Kinesis, Kafka, SNS, SQS, EventBridge</li> <li><strong>Workflow Orchestration</strong>: Temporal, Restate, Inngest</li> </ul> <p><strong>⭐ What We’re Looking For</strong></p> <p>To succeed in this role, you should:</p> <ul> <li><p><strong>Bring Expertise:</strong> 8+ years of experience in backend development, system architecture, and technical leadership, with a proven track record of delivering high-quality, scalable systems.</p> </li> <li><p><strong>Be a Self-Starter:</strong> You take ownership of your work, solve problems independently, and have a "get things done" mentality.</p> </li> <li><p><strong>Think Strategically:</strong> You understand how technical decisions impact the business and balance innovation with practicality.</p> </li> <li><p><strong>Be Passionate About Excellence:</strong> You write maintainable, well-tested, and scalable code, setting the bar high for technical standards.</p> </li> <li><p><strong>Solve Complex Problems:</strong> Your deep system design expertise allows you to architect solutions that are robust, scalable, and future-proof.</p> </li> <li><p><strong>Collaborate with Peers:</strong> While this role isn’t focused on leadership, you’ll work closely with an experienced engineering team to share knowledge, tackle challenges, and set a technical direction that benefits everyone.</p> </li> <li><p>Must be located within ±2 hours of CET timezone</p> </li> <li><p>Being based in or willin