Backend Engineer (JVM)

Backend Engineer

🚀 SEED-Stage FinTech

📍 Hybrid: City of London (3 days per week onsite)

💰 £80,000 – £95,000 + Equity + Benefits

Did you know financial fraud costs the UK economy £200bn+ per year, accounting for over 40% of crime in England and Wales? This early-stage FinTech is on a mission to fight financial crime and reduce scams in online payments

High-ownership, mission-driven, working with sensitive financial data. This is critical infrastructure. When it fails, real people lose money.

What You’ll Do

• Build the APIs and UIs banks plug into their payment flows
• Connect the investigation engine to messy, real-world data (APIs, documents, scraped sources — most of it unstructured)
• Design the orchestration layer that gathers and evaluates evidence across heterogeneous systems
• Ship reliable, secure, observable production code
• Deploy and iterate on LLM-powered investigation flows (not just prototypes)
• Make smart build vs buy decisions and own the trade-offs

This isn’t a feature factory. You’ll design, build, ship, own.

Tech: Kotlin (open to any JVM background), Python, Terraform, Agentic AI, cloud-native, event-driven services

If you’ve built fault-tolerant, distributed systems before, tools matter less than judgement

You’ll Have

• 3+ years building production distributed systems in a startup environment, using backend languages like Java, Kotlin, Scala, Python, C++, Rust or Go
• Experience designing external-facing APIs and working with messy, unstructured data
• Shipped AI/ LLM systems beyond proof-of-concept
• Startup experience: comfortable in ambiguity, taken high ownership
• Strong instincts on trade-offs, speed vs correctness
• Computer Science degree or equivalent

Why Join?

• Work with a highly talented team of 8 other Engineers
• Real equity
• High-stakes technical challenges
• AI X distributed systems X regulated finance

If you want to build fast, reliable AI infrastructure that banks depend on, apply with your CV.