Backend Jobs in United Kingdom

Senior Process Development Engineer (Backend)

New UKSenior

AI Cloud Process Improvement Root Cause Analysis Six Sigma

Senior process engineer at Lumentum's Caswell semiconductor fab (Towcester, UK) developing and improving photonic chip manufacturing processes — thin-film deposition (ALD, PECVD, sputtering), metallization, and backend wafer processing (thinning, CMP, dicing) — using SPC, Six Sigma, and Lean to drive yield, NPI, and cycle-time gains.

Xapply

Senior Backend Engineer — Remote, AI-Driven Platform

New RemoteUKSenior

A remote-first engineering organization is hiring a Senior Backend Engineer to design, implement, and evolve backend capabilities across teams. Day to day, the role involves shaping architecture, improving reliability and performance, mentoring engineers, and collaborating with PMs and designers across product, infrastructure, data, and security boundaries.

Senior Backend Engineer - AI Platform (Hybrid, London)

New HybridUKSenior

A Staff/Senior Backend Engineer at Capsa AI owns projects end-to-end, building the infrastructure and services behind its AI platform — designing agent features, scalable data pipelines, and robust APIs. Based in London on a hybrid schedule (4 days/week in office), in a fast-paced startup.

AI API Data Pipelines

motorolasolutions

Senior Backend Engineer - Cloud/AI (Hybrid UK)

New HybridUKSenior

Develop and maintain the cloud-based backend of Motorola Solutions' Alta Video Management System, which monitors and manages video cameras, access control systems and sensors. This is a hybrid role (1-2 days/week in the Uxbridge office) in an agile R&D environment with a focus on quality and security.

Corevia Search

Senior Backend Engineer - High-Throughput Systems (Remote)

New RemoteUKSenior

Distributed Systems Kafka RabbitMQ

Senior backend engineer at Corevia Search owning major parts of a high-throughput platform handling thousands of transactions per second at ~50ms latency. Day to day: designing distributed systems, working with Kafka/Pub-Sub/RabbitMQ, driving engineering standards and mentoring, with a path toward Staff/EM roles.

BPM Tech

Cloud Backend Engineer | AWS + Node/TypeScript | Hybrid UK

API AWS Cloud DynamoDB Lambda +5 skills

A back-end/cloud engineer at BPM Tech designs scalable services and REST APIs with Node.js and TypeScript, and builds serverless applications on AWS (Lambda, API Gateway, S3, DynamoDB), collaborating with front-end developers in a hybrid London-based team.

yld2

New HybridUKContractSenior

Contract Senior Backend Engineer (Go) - London/Remote

YLD is hiring a contract Senior Backend Engineer (Go) to join a client team, designing scalable, resilient architectures and collaborating with cross-functional teams. The role is London-based hybrid (1-2 days on-site per week) with a remote-first approach across distributed teams.

Carousel Consultancy Ltd

Backend Engineer – FinTech AI Platform (Hybrid/Remote)

New HybridUK

AI API AWS Event Driven Architecture Express.js +4 skills

Backend Engineer at a fast-growing FinTech AI platform in London: design and run backend services plus RESTful and event-driven APIs using Node.js, Express, Python and AWS. Hybrid in London or UK/European remote, salary up to £100k plus equity.

up to 100K £

Backend Engineer TypeScript – Remote/WFH Cyber Security

New HybridUK

Builds and owns TypeScript backend services for a cybersecurity company's customer portal, taking features from rapid prototype to production-ready systems with a security focus. Hybrid role: two days per week in the Cambridge office, the rest working from home.

TypeScript

Backend Engineer - AI Platforms & Workflows

V7 is hiring a Go (Golang) backend engineer in London to build AI platform services that let foundation models run over multimodal data at scale, plus the rich API surface powering internal systems and customer-facing products. The small team ships to production multiple times a day.

KO2 Embedded Recruitment Solutions LTD

Senior Backend Engineer - Modern C++ on Linux (Hybrid)

New UKSenior

Senior Backend Engineer building backend systems in Modern C++ on Debian Linux for a UK manufacturer of advanced scientific instruments in Oxford. Leads software development, designs APIs for the web GUI and customer scripts, and mentors engineers, on a hybrid basis with three days a week on-site.

Remote Cloud-Native Backend Engineer (AWS)

New RemoteUK

Automation AWS CI/CD Cloud Cloud Native

Smile IT Solutions is hiring a Software Engineer to design, build, and maintain backend services and cloud-native applications on AWS, collaborating with developers, architects, and product stakeholders. Day to day involves implementing features, improving reliability, supporting migration projects, documenting solutions, and contributing to CI/CD pipelines.

Python Backend Engineer – AI Security R&D (Cambridge)

New HybridUK

AI Prototyping Python Rust TypeScript

A Python backend engineer joins the R&D team in Cambridge to build a new greenfield product that combats AI-based security threats, delivering complex backend systems through rapid prototyping and iterative development, mainly in Python with exposure to Rust and TypeScript, in a hybrid work arrangement.

Agntx

Python Backend Engineer — Remote, Public Sector APIs

API Api Design CI/CD DevOps FastAPI +5 skills

Agntx is hiring four Python backend engineers to build production public-sector APIs using Flask/FastAPI and MongoDB, with containerised Linux deployments in a Git-based CI/CD environment. Work is remote with ad hoc travel to Newcastle, inside an IR35 framework and requiring BPSS (SC as needed) clearance eligibility.

iwoca

Senior Backend Engineer - Ledger Platform (Hybrid/Remote UK)

New UKSenior

Senior backend engineer owning iwoca's ledger platform: designing, building and operating reconciliation and reporting systems at scale, with strong emphasis on financial data integrity. Blends hands-on coding with architectural leadership; based in London (hybrid) or remote anywhere in the UK.

Front Office C++ Backend Engineer - London Hybrid to £125k

New HybridUKSenior

C++ Design Patterns Linux

Senior C++ backend engineer building a core equity trading system for front-office desks in London. Day-to-day is C++17/20 on Linux tackling low-latency, high-volume data challenges alongside traders. Hybrid role (one day a week from home), paying up to £125k plus bonus.

up to 125K £

Backend Engineer (C#/.NET) - Trading Systems, London

Backend engineer building high-performance trading systems in C#/.NET with SQL for a hedge fund technology team in London, collaborating with quantitative researchers on valuation and pricing components and owning projects from design through delivery.

Low-Latency Backend Engineer for OpenRTB

Build and run low-latency OpenRTB bidding infrastructure and scalable services at Adorphic, making millisecond-level decisions at high volume. You own performance and reliability, work close to the metal, and collaborate with data/ML teams to improve the Lode signal in live bidding.

Machine Learning

Remote Senior Magento Backend Engineer

New RemoteUKSenior

E-commerce GraphQL PHP Version Control

A senior backend engineer leads the setup of new Magento e-commerce projects — environment deployment, version control, and building scalable solutions with Magento 2, PHP 8+, and GraphQL. Day to day involves performance optimization and mentoring a growing team in a fully remote setup.

INFUSED SOLUTIONS LIMITED

Lead Backend Engineer - TypeScript & Node.js (On-site)

New UKLead

Lead backend engineer splitting hands-on development in TypeScript and Node.js with people leadership: driving backend architecture, setting technical direction, and mentoring a small full-stack team in Kent while championing modern, AI-assisted engineering practices to build scalable systems.

AI Node.js TypeScript