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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 fintech startup revolutionising 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 in a dynamic, mission-driven environment.
- Qualifications: 3+ years in backend systems with C#/.NET; experience in DDD, CQRS, and microservices required.
- Other info: Work in-person in London with a passionate team; high expectations for driven individuals.
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.
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 during interviews and demonstrate your passion for the industry.
✨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 these technologies, as this will highlight your hands-on skills and alignment with the role's requirements.
✨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 navigated ambiguity, as this aligns with the company's culture and expectations.
✨Tip Number 4
Prepare to discuss how you've used AI tools in your development process. Since the role requires leveraging AI for efficiency, being able to articulate your experience 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 🫡
Tailor Your CV: Make sure your CV highlights your experience with C#/.NET, backend systems, and any relevant architectural patterns like DDD and CQRS. Emphasise your hands-on experience in small teams or startups.
Craft a Compelling Note: In your note, express your enthusiasm for the role and the company's mission to revolutionise global payments. Share specific examples of how your skills align with their needs and why you want to be part of this journey.
Showcase Your Problem-Solving Skills: Include examples in your CV or note that demonstrate your ability to solve complex problems elegantly. Highlight any experience using AI tools in your development process, as this is a key requirement for the role.
Proofread Your Application: Before submitting, double-check your CV and note for any spelling or grammatical errors. A polished application reflects your attention to detail and professionalism, which is crucial for a founding engineer role.
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 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 solving complex problems on the spot, showcasing your ability to think critically and design scalable systems. Use real-world scenarios to illustrate how you approach problem-solving.
✨Emphasise Your Experience with AI Tools
Since the role requires using AI tools as a must-have, be sure to highlight your familiarity with these technologies. Discuss how you've used AI to enhance your coding, debugging, and shipping processes in previous roles.
✨Align with Their Mission and Culture
Research the company’s mission to rewire global payments infrastructure and express your enthusiasm for being part of such a transformative project. Show that you understand the startup environment and are ready to embrace the high expectations and fast-paced work culture.
