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For Companies At a Glance
- Tasks: Join us to design, build, and launch a cutting-edge fintech platform.
- Company: We're an innovative startup transforming global payments with a fresh approach.
- Benefits: Enjoy competitive salary, equity options, and flexible remote work opportunities.
- Why this job: Be part of a mission-driven team shaping the future of finance from day one.
- Qualifications: 3+ years in backend systems with C#/.NET; experience in startups is a plus.
- Other info: Work in-person in London with a small, passionate team focused on real impact.
The predicted salary is between 43200 - 72000 £ per year.
We are an early-stage fintech startup re-wiring the global payments infrastructure. Today, sending money across borders is slow, expensive, and fragmented. We are here to fix that—making instant cross-border payments a reality. We are building from zero—no tech debt, no legacy systems. Just a clean slate, strong vision, and higher standards. Now we are looking for a founding backend engineer to join us at the ground level and help bring this platform to life.
The Role
- You will work directly with the founders to design, build, and launch our core platform.
- This is a hands-on, high-impact role: you will write code daily, influence key architectural decisions, and ship fast using modern tools and AI.
- Build a modern backend from scratch in C#/.NET 8 with a clean, event-driven architecture.
- Help architect a scalable system using CQRS, Event Sourcing, DDD, microservices.
- Own key components in AWS: Lambda, SQS, SNS, DynamoDB, PostgreSQL, API Gateway.
- Work in a test-first, high-trust environment with real autonomy.
About You
- You work incredibly hard, really care about your work and take pride in what you do.
- You ship clean code, scalable systems, and solve complex problems elegantly. You are excited by ownership and unafraid of ambiguity. You move fast, but with precision.
- You use AI tools to design, code, debug, and ship faster, not just as a nice-to-have but a MUST-have force multiplier.
What we are after:
- 3+ years experience building backend systems and APIs in C#/.NET.
- Strong grasp of architecture patterns: DDD, CQRS, microservices.
- Experience writing clean, testable code with a TDD mindset.
- Experience working in small teams or startups, where autonomy and speed matter.
- Comfort with cloud-native infrastructure (preferably AWS).
Nice to Have:
- Hands-on experience with event sourcing in production.
- Background in payments, fintech, or secure data platforms.
- Experience building B2B platforms or financial APIs.
Why Join Us?
- Build from 0 to 1: You will shape the architecture, team, and product from day one.
- Real ownership: You won’t be a cog—you will be a core part of the company’s foundation.
- Mission-driven: Help reinvent a critical piece of global financial infrastructure.
- Equity upside: Generous options in what we believe can be a generational fintech company.
- Work with intensity and purpose, in-person with a small team of true builders in London.
Why you shouldn’t join
- Expectations are incredibly high.
- You are looking for a comfy job with a 40 hour a week commitment with predictable hours and minimal pressure.
- You don’t see the value in using AI to enhance engineering teams.
Logistics
- Location: In-person in London 5 days a week with some flexibility (e.g. remote Fridays).
- Compensation: Competitive salary + high-equity package.
To apply please send your CV and a quick note on why you want to join to hello at 3degrees dot co. No visa sponsorship of any kind at this point.
Contact Detail:
Stealth Startup Recruiting Team
StudySmarter Expert Advice 🤫
We think this is how you could land Founding Backend Engineer
✨Tip Number 1
Familiarise yourself with the latest trends in fintech and global payments. Understanding the current challenges and innovations in this space will help you engage in meaningful conversations during interviews and demonstrate your passion for the industry.
✨Tip Number 2
Showcase your experience with C#/.NET and relevant architectural patterns like DDD and CQRS. Be prepared to discuss specific projects where you've implemented these technologies, as this will highlight your hands-on experience and problem-solving skills.
✨Tip Number 3
Emphasise your ability to work in a fast-paced, startup environment. Share examples of how you've thrived in small teams, taken ownership of projects, and adapted to ambiguity, as these traits are crucial for a founding role.
✨Tip Number 4
Demonstrate your familiarity with AI tools in engineering. Discuss how you've used AI to enhance your coding, debugging, or design processes, as this aligns with the company's vision of leveraging technology for efficiency.
We think you need these skills to ace Founding Backend Engineer
Some tips for your application 🫡
Tailor Your CV: Make sure your CV highlights your experience with C#/.NET, backend systems, and architectural patterns like DDD and CQRS. Use specific examples to demonstrate your skills in building scalable systems and clean code.
Craft a Compelling Cover Note: In your cover note, express your enthusiasm for the role and the company's mission. Mention your experience in fintech or payments, and how you can contribute to building their platform from scratch.
Showcase Relevant Projects: If you have worked on projects involving microservices, event sourcing, or cloud-native infrastructure, be sure to include these in your application. Highlight your role and the impact of your contributions.
Demonstrate AI Proficiency: Since the role requires using AI tools, mention any relevant experience you have with AI in your coding process. Explain how you've used AI to enhance your work efficiency and problem-solving capabilities.
How to prepare for a job interview at Stealth Startup
✨Showcase Your Technical Skills
Be prepared to discuss your experience with C#/.NET and backend systems. Bring examples of projects where you've implemented DDD, CQRS, or microservices, and be ready to explain your architectural decisions.
✨Demonstrate Problem-Solving Abilities
Expect to face technical challenges during the interview. Practice articulating your thought process when solving complex problems, especially in a fast-paced environment like a startup.
✨Emphasise Your Experience with AI Tools
Since the role requires using AI tools as a core part of the development process, be sure to highlight any relevant experience you have. Discuss how these tools have helped you design, code, and debug more efficiently.
✨Align with Their Mission
Research the company’s vision for transforming global payments. Be ready to express why you’re passionate about fintech and how you can contribute to their mission of making instant cross-border payments a reality.
