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- Tasks: Join us to design, build, and launch a cutting-edge payments platform.
- Company: We're an innovative fintech 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 the ground up.
- Qualifications: 3+ years in backend systems with C#/.NET; experience in DDD, CQRS, and microservices required.
- Other info: Work in-person in London, 5 days a week, with a dynamic and ambitious team.
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’re building from zero—no tech debt, no legacy systems. Just a clean slate, strong vision, and higher standards.
The Role
- You’ll 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’re 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’ll shape the architecture, team, and product from day one.
- Real ownership: You won’t be a cog—you’ll 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’re 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.
Founding Backend Engineer employer: Stealth Startup
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 challenges and innovations in this space will help you engage in meaningful conversations with the founders during interviews.
✨Tip Number 2
Showcase your experience with C#/.NET and cloud-native infrastructure, particularly AWS. Be prepared to discuss specific projects where you've implemented scalable systems or microservices, as this will demonstrate your hands-on expertise.
✨Tip Number 3
Highlight your ability to work in a fast-paced, startup environment. Share examples of how you've thrived under pressure and contributed to team success, as this aligns with the company's high expectations and mission-driven culture.
✨Tip Number 4
Prepare to discuss how you've used AI tools in your development process. Since the role emphasises leveraging AI for efficiency, demonstrating your familiarity with these tools will set you apart from other candidates.
We think you need these skills to ace Founding Backend Engineer
Some tips for your application 🫡
Understand the Company: Before applying, take some time to understand the fintech startup's mission and vision. Familiarise yourself with their approach to re-wiring global payments and how your skills as a backend engineer can contribute to this goal.
Tailor Your CV: Make sure your CV highlights your experience in building backend systems and APIs, particularly in C#/.NET. Emphasise your familiarity with architectural patterns like DDD, CQRS, and microservices, as well as any relevant experience in cloud-native infrastructure.
Craft a Compelling Note: In your application note, express your enthusiasm for the role and the company’s mission. Share specific examples of how your past experiences align with the responsibilities of the founding backend engineer position and why you are excited about the opportunity to build from the ground up.
Showcase Your Problem-Solving Skills: Highlight instances where you've solved complex problems or built scalable systems. Mention your experience with TDD and using AI tools in your development process, as these are key aspects the company values.
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. Think aloud as you work through problems, showcasing your ability to solve complex issues elegantly and efficiently.
✨Emphasise Your Experience in Startups
Highlight your experience working in small teams or startups. Discuss how you've thrived in high-pressure environments and how you value autonomy and speed in your work.
✨Express Your Passion for Fintech
Convey your enthusiasm for the fintech industry and the mission of the company. Share any relevant experiences or insights that demonstrate your commitment to reinventing global financial infrastructure.
