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Senior Backend Engineer

Oliverbernard — United Kingdom · Posted ~3 hours ago

Senior Full-time Visa History ✓

Skills

C# Python backend development API design event-driven architecture multi-tenant systems LLMs agentic AI data modeling LLM APIs React

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Summary ✨ AI‑Generated

An early-stage technology venture is seeking a senior backend engineer to build core services and infrastructure from the ground up. You will design event-driven, multi-tenant systems, develop APIs, deploy LLM and agentic workflows, and own data models, reliability, auditability, and performance. This high-agency role offers genuine architectural ownership, close collaboration with founders, and the opportunity to contribute to frontend work when needed.

Highlights

High-ownership opportunity in an early-stage environment with substantial influence over architecture and technical direction. The role combines backend engineering with cutting-edge AI, offering equity and direct collaboration with founders.

Description

🚀 Senior Backend Engineer | Early-Stage AI FinTech | London | Up to £80k + Equity | C#/Python OB have recently partnered with an early-stage AI fintech start-up that’s building from the ground up, and they’re looking for a Senior Backend Engineer to join the early team and have genuine ownership over the product and platform. This is a high-agency role for someone who wants to build, ship and own rather than inherit an established codebase. 🛠️ What you’ll be doing Design, build and own core backend services, APIs and infrastructureBuild event-driven, multi-tenant systems from the ground upShip LLM and agentic workflows into productionOwn data models, failure modes, auditability and system performanceTake features from spec → architecture → productionBuild API-first products and infrastructureWork directly with the founders and have a major influence on technical directionBe comfortable jumping into React / Frontend when a feature needs it 🎯 What they’re looking for 3–4+ years building, shipping and owning backend systemsStrong experience with C# and/or PythonExperience working with AI tooling / LLMs / agentic systemsFintech experience is essential, ideally across payments, banking, open finance, ledgers or adjacent financial infrastructureComfortable working across the stack when needed, React experience is a bonusSomeone who enjoys ambiguity, moves quickly and is comfortable taking ownership 💡 The opportunity You’ll be joining at a genuinely early stage, meaning you’ll have high agency, direct founder exposure and significant influence over what gets built and how. You’ll be building core infrastructure for an AI-native fintech from the ground up. 📍 London — 3–4 days per week in-office 💰 Up to £80k + meaningful equity ⚡ Early team | High ownership | Fast-paced | AI + FinTech If you’re a backend engineer with a strong fintech background and want to get in early on an AI company, apply below for more info. #FinTech #AI #BackendEngineering #SoftwareEngineering #LondonTech #Python #CSharp #LLM #Startups #Hiring