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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 a founding engineer shaping the future of finance with real ownership and impact.
- Qualifications: 3+ years in backend systems with C#/.NET; experience in small teams or startups preferred.
- Other info: Work in-person in London, 5 days a week, with some flexibility.
The predicted salary is between 43200 - 72000 £ per year.
About Us
We are an early-stage fintech startup re-wiring the global payments infrastructure. Today, sending money across borders is slow, expensive, and fragmented. We're 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. Now we’re looking for a founding backend engineer to join us at the ground level and help bring this platform to life.
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'll 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're 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 current 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 architectural patterns like DDD and CQRS.
✨Tip Number 3
Demonstrate 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 while delivering high-quality results.
✨Tip Number 4
Highlight your proficiency in using AI tools to enhance your coding and debugging processes. Discuss how these tools have helped you improve efficiency and quality in your previous roles, as this aligns with the company's vision.
We think you need these skills to ace Founding Backend Engineer
Some tips for your application 🫡
Understand the Company Vision: Before applying, take some time to understand the startup's mission of re-wiring global payments infrastructure. This will help you tailor your application to reflect your alignment with their goals.
Highlight Relevant Experience: In your CV and cover letter, emphasise your 3+ years of experience in building backend systems and APIs in C#/.NET. Be specific about projects where you've implemented architecture patterns like DDD, CQRS, and microservices.
Showcase Your Problem-Solving Skills: Provide examples of how you've solved complex problems elegantly in previous roles. Mention any experience with clean, testable code and a TDD mindset, as this is crucial for the role.
Express Your Enthusiasm for Ownership: Make sure to convey your excitement about taking ownership and working in a high-trust environment. Share instances where you've thrived in small teams or startups, highlighting your ability to move fast with precision.
How to prepare for a job interview at Stealth Startup
✨Showcase Your Technical Skills
Be prepared to discuss your experience with C#/.NET and the architectural patterns mentioned in the job description. Bring examples of past projects where you've implemented DDD, CQRS, or microservices, and be ready to explain your thought process.
✨Demonstrate Problem-Solving Abilities
Expect to face technical challenges during the interview. Practice articulating how you approach complex problems and the steps you take to arrive at elegant solutions. Highlight your experience with test-driven development and clean code practices.
✨Emphasise Your Autonomy and Ownership
This role requires a high level of independence. Share experiences from previous roles where you took ownership of projects or components, especially in fast-paced environments like startups. Show that you thrive in ambiguity and can make decisions confidently.
✨Align with Their Mission
Research the company’s vision for transforming global payments. Be ready to express why this mission resonates with you and how your skills can contribute to their goals. Showing genuine enthusiasm for their work can set you apart from other candidates.
