Backend Jobs in United Kingdom

Senior C# Backend Engineer — Secure APIs & Data Pipelines

Open 20d HybridUKSenior

API C# .NET REST SQL +1 skills

Senior backend engineer building robust backend services, data integration pipelines, and secure RESTful APIs (C#/.NET, SQL Server) for a high-growth wealth management firm in Central London. Hybrid role delivering in agile sprints within financial services; 5+ years' backend experience expected.

CamWebDir

Senior Backend Engineer — Cloud Security Platform

Cloud Cloud Security Data Pipelines Palo Alto Networks

Senior backend engineer on Palo Alto Networks' Cortex Cloud platform, building cloud security solutions for developers. Day to day you shape backend features, own critical data pipelines and persistence layers, and drive performance, reliability, and scalable, secure software.

MCS Group | Your Specialist Recruitment Consultancy

Senior Backend Engineer (Typescript)

Open 20d HybridUKSenior

AI AWS Cloud Docker Kubernetes +2 skills

A Senior Backend Engineer builds and improves large-scale applications and backend services (with some full-stack exposure) for a Belfast technology company, helping shape architecture and mentor developers. Core stack: TypeScript, microservices, Docker/Kubernetes, and AWS or a similar cloud platform; hybrid with 3 days in office.

Lever, Inc.

Senior Backend Engineer, Maritime Real-Time Data

ClickHouse Kafka PHP PostgreSQL Python

A senior backend engineer at Kpler owns the architecture of real-time maritime data streaming services, building scalable, high-availability systems with Python, PHP, Kafka, PostgreSQL, and ClickHouse to deliver shipping and commodities market insights, while also handling production reliability and mentoring engineers.

Engg

Senior Backend Engineer, Global Account Sharing (Java)

Wise is hiring a Senior Backend Engineer (Java) in London to build and scale backend services powering international joint accounts and shared finance experiences on its consumer finance platform. Day to day involves contributing to architecture, writing clean, well-tested Java code, and collaborating with Product, Design, Data, and Research teams.

Java

Q1 Technologies, Inc.

Java Backend Engineer – Large-Scale File Processing on AWS

AI API Api Design AWS Flink +6 skills

A Java backend engineer in Bournemouth designing, building, and maintaining high-performance services and large-scale file processing pipelines using Apache Flink on AWS, deployed on Kubernetes with resilient multi-region architecture. The role emphasizes REST API design, microservices, and AI-assisted tools like GitHub Copilot and Claude.

Advanced Resource Managers Ltd

Python Backend Engineer – Banking Platforms (Hybrid London)

Open 20d UKContract

Event Driven Architecture Grafana Kafka Kubernetes Microservices +5 skills

6-month hybrid contract in London building, modernising and supporting distributed, high-availability backend services in a banking environment. Core stack: Python, advanced SQL, microservices/event-driven architecture (Kafka/Tibco), TDD, Kubernetes/OpenShift and Prometheus/Grafana; pays £550-£650 per day inside IR35.

Senior Backend Engineer - Healthcare Tech, Equity & Benefits

Recora Health is seeking a talented backend leader to architect and deliver robust infrastructure for cardiac care and health tech products. You will work closely with engineering, clinical and product leaders to…

pixeltoysltd

Senior Backend Engineer for AAA Mobile Games

Senior server/backend engineer at game studio Pixel Toys in Royal Leamington Spa, owning end-to-end backend feature development for a AAA mobile title — driving architecture decisions, ensuring security and scalability of high-performance server systems, mentoring juniors, and setting engineering standards in an agile team.

Octopus Energy Germany GmbH

Senior Backend Engineer - Pricing & Payments Platform

Backend engineer on Octopus Electroverse's team in London, building the core pricing, billing and discounting platform for the electric vehicle charging ecosystem. Day to day you develop scalable back-end services across core product areas within a small, fast-moving EnTech business.

Bauer Media Outdoor UK

Mid-level Backend Engineer

Open 20d UKMiddle

Mid-level backend engineer at Bauer Media Outdoor UK in London (1-2 days/week onsite) helping sunset a legacy client system and launch a new platform where clients bid for outdoor ad space, manage creative, and view real-time performance. Mostly backend work with some frontend, involving APIs, CI/CD pipelines, and monitoring.

API CI/CD

Bauer Media Outdoor UK

Backend Engineer - Scalable Ads Platform

Open 20d HybridUK

Backend engineer at Bauer Media Outdoor UK in London to sunset a legacy system and help build a new platform where clients bid for advertising space, manage portal graphics, and view real-time ad performance data. Mostly backend/BA-focused work with some frontend, delivered hybrid in London.

ellipsislabs.xyz

Senior Backend Engineer

Blockchain Cloud Rust Unix

Ellipsis Labs, an early-stage startup, is hiring a Senior Backend Engineer in the UK to build and maintain scalable production services (currently thousands of QPS, expected to grow 10x), implement micro/nanosecond-level performance monitoring, and drive initiatives like realtime data indexing at scale. The stack leans Rust, AWS, and Solana/blockchain for decentralized finance.

Oho Group

Founding Backend Engineer - Cybersecurity, Equity

Cloud Cloud Native Cybersecurity

A founding backend engineer at a London cybersecurity startup will own the system architecture of a cloud-native security product, guiding it from design through production while working closely with the founders on reliability, security, and technical direction as the team scales.

Xapply

Senior Backend Engineer - Global Shared Accounts

Java Kotlin Microservices Python

A senior backend engineer at Wise joining the Account Sharing team in the Consumer Squad, building a greenfield shared finances platform for international joint and kid accounts. Day to day they design scalable microservices (Java, Kotlin, Python, or Go) and work with PMs, designers, and analysts to ensure reliability across global markets.

Advanced Resource Managers Ltd

Backend Developer (Python)

Agile CI/CD DevOps Event Driven Architecture Grafana +9 skills

A 6-month hybrid contract in London (inside IR35) building, modernising and supporting business-critical, highly distributed backend systems for a tier 1 bank. Core stack: Python, advanced SQL, microservices with Kafka/Tibco, Kubernetes/OpenShift, and Prometheus/Grafana monitoring.

Backend Engineer

Backend Engineer at Homesearch, a UK PropTech platform helping estate agents win listings through property data and AI. The role involves building backend systems that power this intelligence layer, working onsite from Victoria, South West London.

Motorola Solutions

Mid Level Backend Engineer

HybridUKFull-timeMiddle

Agile AI Analytics API CI/CD +25 skills

The Avigilon Alta Video UI team is responsible for the mission-critical infrastructure that powers our VMS. We are currently evolving our platform to support deep-tier interconnection across the Motorola product…

GlobalLogic UK&I

Senior Java Backend Engineer | Microservices & API

Open 21d UKSenior

API Event Driven Architecture Gradle Java Kafka +3 skills

Design, build, and maintain Java microservices at GlobalLogic UK&I in Scotland, creating RESTful APIs and event-driven services with Java 17+, Spring Boot 3, and Kafka. Day-to-day work applies domain-driven design and uses MapStruct, Feign, Gradle, and integration testing.

Kendal Global Advisory

Senior Backend Engineer - Data, AI & Infra (London)

Open 21d UKSenior

Kendal Global Advisory in London seeks a senior backend engineer to own its data infrastructure — building ingestion pipelines, designing databases, and deploying secure, scalable AI-enabled workflows — working closely with AI-focused analysts and advisers to turn concepts into reliable, auditable software.