Backend Jobs in United Kingdom

Principal Backend Engineer: Architect Scale & Impact

UKPrincipal

Rightmove is hiring a Principal Engineer to lead engineering and architecture across the consumer domain. You will drive scalable system design, shape architectural direction, and partner with product managers to…

Rightmove

Senior Backend Engineer - Java 17+, Spring Boot

Senior Backend Engineer at Rightmove in London, designing and delivering scalable platform features with Java 17+ and Spring Boot. Day to day involves owning services, improving performance, contributing to architecture, and mentoring in a hybrid office-plus-remote setup.

Java Spring

Client Server Limited

Backend Engineer (C++/Python) London/WFH to £125k

A backend engineer role in London (with WFH options) building and optimising high-performance C++ and Python software components that power systematic trading strategies, working alongside engineers and quantitative researchers. Salary up to £125,000.

C++ Python

up to 125K £

Client Server Limited

Java Backend Engineer - Kafka & AWS (Hybrid London)

HybridUK

AWS CI/CD Cloud Java Kafka

A Java backend engineer in London (hybrid, 2 days WFH/week) designs, develops and delivers client projects—mainly in financial services—with a focus on Kafka messaging and AWS cloud deployments, including migrating legacy systems and introducing CI/CD pipelines.

Datascope Recruitment

Senior Backend Engineer - Remote

Agile AWS C++ C# Docker +4 skills

A recruiter is hiring a Senior Backend Engineer to build the backend systems of a AAA simulation game at a game studio, with full remote working across Europe. Day to day involves agile ceremonies, roadmaps and sprint planning, using Go/Java/C#/C++ with Kubernetes, Docker, Terraform and AWS.

Client Server

Senior Backend Engineer TypeScript Node.js

RemoteUKSenior

API AWS CI/CD Cloud Containerization +19 skills

Senior Backend Engineer building TypeScript/Node.js APIs and microservices for a scaling UK games company that blends gaming with luxury fashion. Remote anywhere in the UK, the role covers Kafka event-driven systems, PostgreSQL/MongoDB, AWS, Docker and Terraform, with ownership of scalability and a 99% uptime SLA.

Senior Backend Engineer - API Platform, Java & Microservices

API Developer Experience Java Kafka OAuth +4 skills

Senior backend engineer on Wise Platform's API Experience team in a hybrid London role: designing, building, and leading scalable public APIs with Java, Spring Boot, Kafka, and PostgreSQL, while shaping developer experience for global partners.

Academic Key

Senior AI Training & Experimentation Backend Engineer

Senior backend engineer at Lightning AI scaling backend systems for AI training and experimentation across distributed workloads — designing APIs, orchestrating workflows, and owning production services with a focus on reliability and observability. Hybrid role based in London with at least two in-person days per week.

Senior Golang Backend Engineer — Global Support Platform

Deliveroo in London is hiring a Senior Golang Backend Engineer to build scalable, low-latency services powering internal support tooling and customer-facing platforms used by millions daily. The role spans high-throughput system design, mentoring peers, architectural discussions, and writing well-tested code alongside product, design, and frontend teams.

BrightBox Group

Remote Backend Engineer | Java, REST APIs & Azure

API Azure Confluence GitHub Java +3 skills

Back-End Engineer at BrightBox Group building banking interfaces, reference data and printing services, and shared components that integrate with external systems. Day-to-day development uses Java, Spring Boot, JPA, RESTful APIs, and Microsoft Azure, collaborating with other Java teams in a remote setting.

Napier Technologies Limited.

Go Backend Engineer – Remote-Friendly FinCrime Platform

Automation CI/CD Machine Learning

Back End Engineer (Go) at Napier Technologies in Belfast building a high-performance financial crime detection engine that lets banks apply scenarios and ML models to transaction data. Day to day: developing scalable Go services and CI/CD automation while collaborating across remote teams in a distributed delivery model.

Oscar Technology

Backend Engineer: Python, FastAPI & Multi-Tenant

AI API Java Python Spring

Backend Engineer in London designing and implementing multi-tenant data and workflow services on a high-growth platform: building Python/FastAPI AI service integrations with a Java/Spring core and owning the API layer in a regulated enterprise context. Hybrid role, 3 days per week in-office at Kings Cross.

Multis Uk Limited

Senior Backend Developer (PHP / AI)

UKPart-timeSenior

Agentic AI AI API Automation Azure +15 skills

Senior Backend Developer building and improving production backend systems, REST APIs, and online marketplace platforms in PHP 8+ with SQL databases. Remote role using AI coding tools and agents daily, covering architecture, integrations, testing, code review, and mentoring junior developers.

TESTQ Technologies LTD.

Backend Engineer

UKFull-timeLead

API AWS Azure Cloud Data Visualization +14 skills

A senior backend/platform engineer who designs, builds and runs scalable, observable microservices end to end, handles production incidents and platform modernization, and contributes to DevOps/Platform/SRE initiatives. Core tech spans HTTP/DNS/TLS, reverse proxies, service meshes, API gateways, Grafana/InfluxDB observability, and Linux, with Docker/Kubernetes and cloud exposure preferred.

M-XR

Senior Backend Engineer

HybridUKSenior

AI API Api Documentation Authentication Automation +18 skills

Builds and scales the backend services for M-XR's web SaaS platform that turns photos into photorealistic 3D assets using in-house AI models. Day to day: designing FastAPI-based user-facing APIs, auth and payments, data models in MongoDB/PostgreSQL, AWS job queues for ML pipelines, plus monitoring and CI/CD.

Oscar Associates Limited

Backend Engineer

HybridUKContract

AI API Authentication AWS CI/CD +22 skills

Backend engineer at a newly formed venture backed by an investment-services business, building an enterprise multi-tenant SaaS platform: designing Python 3.11/FastAPI REST and async services, working at Java/Spring and PostgreSQL boundaries, implementing tenant isolation, and deploying on AWS with LLM service integration. Office-based in King's Cross, London three days a week.

85K – 105K £

SmartRecruiters, Inc.

Backend Engineer - Contacts Team

Agile API Distributed Systems Java REST +2 skills

Backend engineer on Wise's Contacts team in London, building the Java backend services that let customers add, find, and manage payment recipients at scale — including secure platforms for tens of millions of bank accounts, search, and local integrations. Core stack: Java, distributed systems, SQL/NoSQL databases, and RESTful APIs.

Go Backend Engineer — Scalable, Low-Latency Support Tools

Builds scalable, low-latency Go backend services powering internal support tools and global customer experiences. Day to day: collaborating with product managers, designers, and frontend engineers to ship features, design robust systems, and maintain high code quality, with a distributed-systems focus.

Distributed Systems Go

Rustify

Rust/C++ Backend Engineer — Scalable, Reliable Systems

API C++ Distributed Systems Observability Rust

Backend engineer (posted for xAI) building scalable, reliable production systems that power grok.com and its API. Day to day involves writing Rust or C++, improving performance and infrastructure reliability, and working closely with teammates on distributed systems with observability practices.

London Stock Exchange Group

Senior Distributed Backend Engineer

API AWS Cloud Cloud Native Data Modeling

Senior engineer at London Stock Exchange Group designing and scaling data distribution systems that deliver data via APIs, cloud platforms, and client-facing services. Day to day involves owning system design, data modelling, and engineering standards using distributed backend systems, AWS, and relational databases.