Backend Jobs in United Kingdom

Affirm

Staff Software Engineer, Backend (Identity International)

RemoteUKStaff

Analytics AWS Distributed Systems Kotlin Kubernetes +3 skills

At Affirm, we exist for the moments that matter—giving people a clear, predictable way to pay over time, with no hidden fees, no surprises, and no tradeoffs on what matters most. Identity at Affirm is mission-critical;…

Bjak

Senior Backend Engineer, Platform & Integrations

AI API AWS Azure CI/CD +10 skills

About BJAK The original mission of BJAK is we believe people deserve smarter ways to plan, save and grow their money. This is the origin of our name. Started in 2019, we built the first mobile-first, insurance…

Mimica

Staff/Senior Backend Engineer (Node.js)

RemoteUKFull-timeStaff

Agentic AI AI API Automation Distributed Systems +10 skills

What we are building Mimica is an AI-powered process intelligence platform enabling enterprises and individuals to reclaim their most precious resource: time. We've all seen repetitive tasks and redundant processes…

PhysicsX

Staff Backend Software Engineer - GO & Python

HybridUKStaff

AI Ai Enablement Analytics API Argo CD +11 skills

About us Re-architecting Engineering for the Age of Intelligence PhysicsX is the physics AI company for industrials. The company’s mission is to accelerate hardware innovation by overhauling what industrial engineering…

Adaptyv

HybridEurope, UKFull-time

Software Engineer, Backend

Adaptyv is building an automated lab that lets AI agents run biology experiments. We're entering the era of agentic science where AI models can now design novel proteins, propose hypotheses, and iterate on…

Agentic AI AI API Api Design Automation +6 skills

Sparta

Senior Backend Engineer

AWS Claude Code DevOps Distributed Systems Flink +9 skills

We Are Sparta Sparta is the next-generation commodity trading platform. We give trading desks the clarity, control, and collaboration they need to move faster and trade smarter. In February 2025, we secured $42 million…

Trading212

HybridEurope, UKFull-timeStaff

Staff Backend Engineer

+1

Our mission is to enable everyone to build wealth We reinvent how trading and investing work by creating exceptional products people love. That takes high standards, high velocity and engineers who own what they ship.…

AWS ClickHouse Docker Elasticsearch Grafana +12 skills

Trading212

HybridEurope, UKFull-timeSenior

Senior Backend Engineer

Our mission is to enable everyone to build wealth We reinvent how trading and investing work by creating exceptional products people love. That takes high standards, high velocity and engineers who own what they ship.…

AWS ClickHouse Docker Elasticsearch Grafana +12 skills

Midnite

Senior Backend Engineer

RemoteUKFull-timeSenior

API AWS Cloud Cloud Native Distributed Systems +12 skills

🚀 Why Midnite? Midnite is a next-generation sports betting and gaming platform built for a new wave of players. We combine sharp product thinking, bold brand, and fast execution to create experiences that feel modern,…

Smarkets

Senior Backend Software Engineer

AWS CI/CD Cloud C++ DevOps +12 skills

Who are we? Smarkets: Predicting the Future of Betting Smarkets runs one of the world’s most sophisticated prediction markets, handling over £29 billion in volume since 2010 and engaging 200,000+ traders globally.…

Blockchain.com

Back-End Engineer, Trading

UKFull-time

API AWS Blockchain Cloud Cryptocurrency +11 skills

Blockchain is connecting the world to the future of finance. As the most trusted and fastest-growing global crypto company, it helps millions of people worldwide safely access cryptocurrency. Since its inception in…

Blockchain.com

Senior Back-End Engineer, Trading Platform

RemoteUKFull-timeSenior

Blockchain Cloud C++ Cryptocurrency Data Ingestion +7 skills

Blockchain is connecting the world to the future of finance. As the most trusted and fastest-growing global crypto company, it helps millions of people worldwide safely access cryptocurrency. Since its inception in…

Heidi

Backend Software Engineer - New Bets

HybridUKFull-timeMiddle

AI AWS CI/CD Claude Code Cloud +7 skills

Who is Heidi? Heidi is building an AI Care Partner that supports clinicians every step of the way, from documentation to delivery of care. We exist to double healthcare’s capacity while keeping care deeply human. In…

Airalo

Backend/PHP Engineer

RemoteUKFull-time

AI API AWS CI/CD Cloud +12 skills

Help Us Build The Future of Travel At Airalo, we're making it easier for people to stay connected wherever they travel. As the world's first eSIM store, we help millions of travelers access affordable mobile…

Proton

API Api Design CI/CD Cryptography Developer Experience +4 skills

Senior Backend Engineer (Foundation)

Europe, UKSenior

Join Proton and build a better internet where privacy is the default Proton was founded in 2014 by scientists from CERN on a simple truth: privacy is a fundamental human right . Since then, we’ve built the world’s…

Apron

Senior Software Engineer | Backend

AI Backbone.js Fintech JVM Kotlin +3 skills

About Apron Small businesses are the backbone of the economy, but the systems they rely on for payments are slow, manual and were never built for them. Apron is fixing that. We digitise and simplify how SMBs manage…

Grafana Labs

Staff Backend Engineer - Alerting | UK | Remote

RemoteUKStaff

AI Anthropic Cloud C++ Distributed Systems +7 skills

Grafana Labs is the company behind Grafana Cloud, the fully managed observability platform trusted by more than 10,000 organizations to ensure reliability, resolve incidents faster, and optimize telemetry at scale.…

iwoca

Back End Engineer - Repeats

UKFull-time

AI Analytics AWS Claude Code Data Science +12 skills

Back End Engineer - Repeats Hybrid in London, United Kingdom (At least one day in office per week) We're looking for a back-end engineer to join the Repeats team. You will work on the services that decide which…

iwoca

Senior Back End Engineer - Customer Operations Platform

UKFull-timeSenior

AI Claude Code CRM Data Science Distributed Systems +6 skills

Senior Software Engineer - Customer Operations Platform Hybrid in London, UK (1-2 days per week) We’re looking for a Senior software engineer iwoca’s operational tools and processes are a competitive advantage,…