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Founding Backend Engineer

Founding Backend Engineer

Stealth StartupLondon Area, United Kingdom, United Kingdom
30+ days ago
Job type
  • Full-time
Job description

About Us

We are an early-stage fintech startup (not rebuilding but) 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 an early-stage fintech startup, backed by industry insiders, with deep experience in the financial ecosystem. 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 solving 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.

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    Backend Engineer • London Area, United Kingdom, United Kingdom