Senior / Staff Software Engineer (Backend)

Job description

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.

In 2023, the German Volksbank Raiffeisenbank Bayern Mitte acquired a stake in 21bitcoin to help build the Bitcoin financial platform of the future.

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!

👋 The Role

As a Senior / Staff Software Engineer (Backend), 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.

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.

Tasks

🚀 Your Mission

As a Senior / Staff Software Engineer (Backend), you will:

• Rebuild the Core: Rewrite and modernize our backend using TypeScript / Go and other cutting-edge technologies, ensuring it’s robust, scalable, and future-proof.
  
  This backend will serve as the cornerstone for future growth.


• Challenge the Status Quo: Identify and replace outdated implementations, tools, and processes with innovative, high-performance solutions that align with the highest professional standards.


• Own End-to-End Delivery: Take full responsibility for designing, implementing, and deploying backend systems that prioritize quality, maintainability, and scalability.


• Drive Technical Excellence: Push for clean, modular code, seamless integrations, and optimal architecture, ensuring our backend sets a new benchmark for the team’s velocity and success.


• Foster a Culture of Innovation: Collaborate with a highly skilled team to solve complex technical challenges, share knowledge, and continuously raise the bar for engineering excellence.

🎯 What Success Looks Like

• Backend systems are highly scalable, reliable, and easy to maintain, supporting the foundation that supports the company’s long-term growth and scalability goals.


• Development teams deliver features faster, more efficient and more reliable and greater confidence, thanks to efficient processes and technical standards.


• Clear coding practices and best-in-class tools are adopted across the engineering team.


• The engineering team thrives on responsibility, collaboration, and a shared commitment to professional, high-quality standards.

Requirements

🛠️ Your Toolbox

• Languages & Frameworks: TypeScript, Go, NestJS, GraphQL


• Databases: PostgreSQL, DynamoDB


• Infrastructure: Serverless (CDK, Terraform), Fargate, Docker


• Messaging & Streams: Kinesis, Kafka, SNS, SQS, EventBridge


• Workflow Orchestration: Temporal, Restate, Inngest

⭐ What We’re Looking For

To succeed in this role, you should:

• 
  

  Bring Expertise: 8+ years of experience in backend development, system architecture, and technical leadership, with a proven track record of delivering high-quality, scalable systems.

  
  


• 
  

  Be a Self-Starter: You take ownership of your work, solve problems independently, and have a get things done mentality.

  
  


• 
  

  Think Strategically: You understand how technical decisions impact the business and balance innovation with practicality.

  
  


• 
  

  Be Passionate About Excellence: You write maintainable, well-tested, and scalable code, setting the bar high for technical standards.

  
  


• 
  

  Solve Complex Problems: Your deep system design expertise allows you to architect solutions that are robust, scalable, and future-proof.

  
  


• 
  

  Collaborate with Peers: 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.

  
  


• 
  

  Must be located within ±2 hours of CET timezone

  
  


• 
  

  Being based in or willing to relocate to Munich, Salzburg, or Vienna is a significant advantage (relocation assistance available)

  
  

Benefits

🚀 Why YOU should join 21bitcoin

1. Impact: Shape the future of Bitcoin financial services by leading critical projects and redefining technical standards.


2. Autonomy: Work in a fast-paced startup environment where you have the freedom to drive impactful solutions.


3. Innovation: Build cutting-edge systems using modern tools, languages, and cloud-native infrastructure.


4. Growth: Collaborate with a highly skilled team that values mentorship, learning, and pushing boundaries.

💸 Competitive compensation: We will offer you a mix of cash and stock options based on your appetite for upside.

🏢 Remote First, with In-Person Magic: We prioritize remote work for flexibility but cherish the power of face-to-face collaboration.

Join us at our vibrant hubs in Munich, Salzburg, and Vienna to experience the best of both worlds! We provide relocation assistance.

🕑 Flexible working hours: We value focus time.

Encouraging everyone to minimize fixed meetings and leverage asynchronous communication.

Salary Range: EUR 60.000 - 120.000 gross p.a.*

*Final compensation will be determined based on the candidate's qualifications, skills, previous experience and location.

🤝 Let’s Build the Future of Bitcoin Together

If you’re excited to work on challenging problems, write best-in-class backend code, and contribute to innovative product development, we’d love to hear from you.

Apply now and become a key part of the team driving 21bitcoin’s success.

📝 Interview Process

How to apply?

Please reach out to us and include a bit about yourself, your resume/CV, examples of past projects, and a few bullet points about why you’re interested in joining 21bitcoin and what you expect.

BTW: CVs are important, but don't forget to include your favorite Bitcoin meme in the application!

• 🗒️ Resume Review - Portfolio of Work: Drop a link to your portfolio/previous work or CV which we can review (LinkedIn, Github, Twitter, …)


• 📞 Exploratory Call - We'll discuss what excites you about this role and a few questions based on your past experiences


• 🧠 Test assignment - We will share a take home creative assignment with you to work on (usually 1 week time frame)


• 🗣️ Engineering Deep Dive - During the deep dive session, we will discuss specific skills for each role through a case study or a technical interview.


• 👬 Meet Us (Workshop) - During the workshop, we will explore various real-world problems that you will be expected to solve in your role.


• 👍 Decision time!

21bitcoin (FIOR Digital GmbH) wurde 2021 von Daniel Winklhammer und Dominik Seibold gegründet.

2022 erhielten wir von der österreichischen Finanzmarktaufsichtsbehörde eine Registrierung als Dienstleister für virtuelle Währungen.

Unser internationales Team, das an den Standorten Salzburg und Wien arbeitet, vereint umfangreiches Wissen über Bitcoin und die Finanzindustrie mit Know-how über digitale Geschäftsmodelle sowie technischem und rechtlichem Wissen.

Required Skill Profession

Computer Occupations