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Backend Engineer II — High Scale Distributed Systems (Equity)

Software Careers is seeking a Software Engineer II in London to take ownership of high-scale backend infrastructure. This role involves working with distributed systems processing over 1 trillion queries daily and solving complex algorithmic challenges. Ideal candidates should have proficiency in C#, Java, C++, ...

Founding ML Engineer: Build the Talent Matching Engine

A tech company based in Greater London is seeking an ML Engineer to develop an AI-driven talent matching system. You will own the matchmaking engine, build embedding models, and ensure reliable backend services. The ideal candidate has strong expertise in Python and ML foundations along with practical production ...

Lead Software Engineer Data & Graph Platform

The UK Dementia Research Institute is seeking an enthusiastic Software Engineer to lead the development of DataMap, a platform to extract knowledge from biological datasets. This hybrid role requires expertise in data-intensive applications, including API design, backend services using Python, and web UI develop ...

ML Engineer: AI Talent Matching Engine + Equity

Dex in Greater London is seeking an ML Engineer who will drive the development of an AI talent matching system. The role entails working with embeddings, vector search, and building reliable backend services in Python. The candidate should possess production judgment and robust execution skills, alongside a soli ...

Senior Full Stack Engineer: AI‑Driven Legal Tools

Harnham, a fast-growing legal-tech startup in Greater London, seeks senior Full Stack Engineers to join their team. You'll be building and scaling core backend systems, designing APIs, and working on complex UIs for AI-driven legal workflows. The role demands expertise in Python and/or TypeScript, as well as Rea ...

Hybrid Senior Frontend Engineer — Full Stack AI Platform

Oritain Global Limited is seeking a Senior Frontend Engineer to work in a hybrid environment in London. The ideal candidate will build modern React frontends and robust Python backend services while ensuring reliable production systems. Responsibilities include mentoring junior engineers and using AI-assisted de ...

Senior Full Stack Engineer for AI Platform & Data Viz

Retelligence in Greater London seeks a motivated Full Stack Engineer to join a senior team building advanced AI platforms. The role encompasses managing the entire feature lifecycle, from backend services to interactive frontend experiences. Candidates should excel in Python and TypeScript with a strong grasp of ...

Senior Full Stack Engineer – Remote, Equity & Growth

PolyAI is seeking a Senior Full Stack Software Engineer to lead API design, build robust features using Python and React, and mentor junior developers. The role involves cross-functional teamwork and promotes high coding standards. Candidates should have over 5 years of backend development experience, knowledge ...

AI SaaS Product Engineer End to End, £130k + Equity

Oliver Bernard is seeking a Product Engineer for a fast-growing AI SaaS company located in Greater London, offering a competitive salary of up to £130k plus equity. The ideal candidate will possess expertise in Go or Python for backend development and have experience in product-focused engineering teams. This ro ...

Full Stack Engineer: Build Scalable Cloud Apps & AI Tools

Barclays is looking for a Full Stack Engineer based in Northampton to design and build intelligent automation solutions. The ideal candidate will develop backend services, cloud-native infrastructure, and modern React UIs using AWS, Python, Docker, and other modern technologies. Responsibilities include deliveri ...

Senior Backend Engineer Scale Impact, Stock Options

A leading financial technology firm in Greater London seeks a Senior Backend Engineer to enhance their product development. The ideal candidate will possess over 5 years of experience in software engineering and be skilled in Python and related technologies. Responsibilities include designing scalable systems an ...

Senior Backend Architect (Django/AWS) – Lead Platform

A financial technology company in Greater London is seeking a Mid-Senior level Software Engineer to lead the backend development of their investment reporting platform, Serpentine. The role involves 10+ years of Python development experience, with strong expertise in Django. You will be responsible for architect ...

Senior Backend Engineer — Healthcare Data Platform (London)

A healthcare technology company is seeking a software engineer to build backend systems for managing large healthcare datasets and developing APIs for its marketplace. The ideal candidate will have over 3 years of experience in software engineering, strong programming skills in Python or TypeScript, and an abili ...

Full‑Stack Engineer: Python, APIs & Data Platforms

A leading fintech start-up is looking for a Backend Engineer to design systems and enhance functionality within their platform. The role involves working with Python, Docker, and AWS to improve data processing and automation. The ideal candidate has strong collaboration skills, experience with API design, and ca ...

Client Facing Deployment Engineer

A dynamic technology firm in Greater London seeks experienced backend or full-stack professionals. The role involves working directly with clients to build customized solutions and integrating with various systems. Ideal candidates will have over 5 years of experience in Python and TypeScript, possess strong com ...

Full Stack Engineer — Platform Performance

A leading freelancing platform is looking for a Full Stack Software Engineer in London. In this role, you will work across the stack to optimise performance through frontend and backend technologies. Candidates should have 2-4 years of experience, strong skills in Angular and TypeScript, as well as familiarity w ...

Defence Tech Lead: Backend & AI Engineer (SC Eligible)

A cutting-edge AI company in Greater London seeks a Lead Software Engineer to spearhead backend and edge/IoT engineering for Defence projects. This role requires leading a team, designing complex components, and implementing CI/CD processes. Proficiency in Python and at least one compiled language is essential. ...

Threat Modeling Platform Engineer

A leading technology company in Cambridge is seeking a Software Engineer to build an internal threat modeling platform for security development. Responsibilities include designing and enhancing platform capabilities, collaborating with engineering teams, and contributing to reliability and scalability improvemen ...

Senior Fullstack Engineer — Global Commerce Platform (Remote)

A leading audio streaming service is looking for a Senior Fullstack Engineer to enhance its payment infrastructure. The role involves architecting and implementing backend services using Java and Python to ensure payment processing across their platform. The ideal candidate is experienced in modern JavaScript, c ...

Senior Backend Engineer: AI APIs & Scalable Infra

A leading technology company in Greater London is seeking a Senior Backend Engineer to work on advanced AI systems. The role involves building scalable APIs and improving inference infrastructure while collaborating with AI researchers. The ideal candidate will have strong skills in Python and Go, along with kno ...

Subscriptions Backend Engineer — Scale Premium Memberships (Visa)

A leading software company is looking for a Backend Engineer to join their Subscriptions team. This role involves building systems that power premium memberships for millions of users globally. Key responsibilities include designing and scaling subscription services, payment integrations, and billing infrastruct ...

Full Stack Engineer: Pre Trade Analytics & UI (London)

A leading hedge fund in London is seeking a Full Stack Engineer to join their team. You will contribute to high-impact initiatives and develop web-based trading platforms for pre-trade decision-making and risk evaluation. The ideal candidate has strong skills in TypeScript and React, experience with backend lang ...

Full Stack Engineer HealthTech with Equity & Impact

Immersum is seeking a Software Engineer to join their London-based team, offering hybrid working arrangements. This role involves building and delivering full-stack product features, collaborating closely with Product and Design teams. Candidates should have 3-5+ years of experience in software engineering, with ...

Remote AI Agent Orchestrator

Outlier AI is seeking a skilled engineer to improve AI agents through human feedback. This role will involve backend engineering and complex systems integration, focusing on building and maintaining production-grade software. Ideal candidates will have at least 2 years of experience, proficiency in major program ...

ML Software Engineer (Python/React) – Contract, London

Java Script Works is seeking a Machine Learning Software Engineer for a contract role based in London, United Kingdom. The candidate should have a Bachelor's degree in Computer Science or a related field and possess backend experience in Python, as well as frontend skills in JavaScript and React. This position i ...

New Grad Backend Engineer: AI & Data Pipelines

GodmodeHQ is looking for a New Graduate Backend Engineer to join their team in Waterloo, London. The role involves developing applications using Python and Django with a focus on AI solutions. You will assist in integrations, manage data pipelines, and help scale the company's innovative products. This is a grea ...

ML Engineer: AI Talent Matching Engine + Equity

Dex in Greater London is seeking an ML Engineer who will drive the development of an AI talent matching system. The role entails working with embeddings, vector search, and building reliable backend services in Python. The candidate should possess production judgment and robust execution skills, alongside a soli ...

Founding ML Engineer: Build the Talent Matching Engine

A tech company based in Greater London is seeking an ML Engineer to develop an AI-driven talent matching system. You will own the matchmaking engine, build embedding models, and ensure reliable backend services. The ideal candidate has strong expertise in Python and ML foundations along with practical production ...

Senior Python Engineer Real Time Data, Remote & Equity

Vortexa Ltd is seeking a talented engineer to design and build robust data processing infrastructure in a fast-paced environment. The role includes ensuring data pipeline reliability and collaborating with engineers and data scientists. Candidates should have experience in Python, distributed systems, and backen ...

Senior Full Stack Engineer for AI Platform & Data Viz

Retelligence in Greater London seeks a motivated Full Stack Engineer to join a senior team building advanced AI platforms. The role encompasses managing the entire feature lifecycle, from backend services to interactive frontend experiences. Candidates should excel in Python and TypeScript with a strong grasp of ...

Senior Fullstack Engineer — Global Commerce Platform (Remote)

A leading audio streaming service is looking for a Senior Fullstack Engineer to enhance its payment infrastructure. The role involves architecting and implementing backend services using Java and Python to ensure payment processing across their platform. The ideal candidate is experienced in modern JavaScript, c ...

Senior Full Stack Engineer – Remote, Equity & Growth

PolyAI is seeking a Senior Full Stack Software Engineer to lead API design, build robust features using Python and React, and mentor junior developers. The role involves cross-functional teamwork and promotes high coding standards. Candidates should have over 5 years of backend development experience, knowledge ...

Lead Software Engineer Hardware Design Platform|Flexible

Circuit Mind is seeking a Lead Software Engineer in Greater London to take full ownership of backend development across their products. You will collaborate with various engineering teams to tackle challenges in hardware engineering, leveraging a modern tech stack including Python, PostgreSQL, and more. This pos ...

Lead Software Engineer Hardware Design Platform|Flexible

Circuit Mind is seeking a Lead Software Engineer in Greater London to take full ownership of backend development across their products. You will collaborate with various engineering teams to tackle challenges in hardware engineering, leveraging a modern tech stack including Python, PostgreSQL, and more. This pos ...

Graduate Full Stack Engineer Fintech, Hybrid in Birmingham

Lovey is seeking a motivated Graduate Full Stack Engineer for their Birmingham office. This full-time, permanent position offers a salary between £30,000 to £35,000, ideal for recent graduates. You'll gain hands-on experience across backend and frontend development in a dynamic fintech environment, working with ...

Hybrid Software Engineering Lead Risk & Regulatory

A leading online gaming company in Stoke-on-Trent is seeking a Software Development Team Leader to drive innovation and mentor a talented team. You will oversee the software development life cycle while navigating a fast-paced environment. Key qualifications include expertise in backend languages such as .Net or ...

Senior Python Engineer Real Time Data, Remote & Equity

Vortexa Ltd is seeking a talented engineer to design and build robust data processing infrastructure in a fast-paced environment. The role includes ensuring data pipeline reliability and collaborating with engineers and data scientists. Candidates should have experience in Python, distributed systems, and backen ...

Threat Modeling Platform Engineer

A leading technology company in Cambridge is seeking a Software Engineer to build an internal threat modeling platform for security development. Responsibilities include designing and enhancing platform capabilities, collaborating with engineering teams, and contributing to reliability and scalability improvemen ...

Senior Full Stack Engineer – AI Systems (London, Hybrid, Equity)

SR2 REC LTD is seeking a Senior Full Stack Engineer to design and build high-quality backend systems using Python and create scalable frontend architecture with React and TypeScript. The role is hybrid based in London, offering a salary of £120,000 to £140,000 plus equity. Ideal candidates are those who enjoy ta ...

Graduate Full Stack Engineer Fintech, Hybrid in Birmingham

Lovey is seeking a motivated Graduate Full Stack Engineer for their Birmingham office. This full-time, permanent position offers a salary between £30,000 to £35,000, ideal for recent graduates. You'll gain hands-on experience across backend and frontend development in a dynamic fintech environment, working with ...

Senior Backend Engineer: AI APIs & Scalable Infra

A leading technology company in Greater London is seeking a Senior Backend Engineer to work on advanced AI systems. The role involves building scalable APIs and improving inference infrastructure while collaborating with AI researchers. The ideal candidate will have strong skills in Python and Go, along with kno ...

Full Stack Engineer — Platform Performance

A leading freelancing platform is looking for a Full Stack Software Engineer in London. In this role, you will work across the stack to optimise performance through frontend and backend technologies. Candidates should have 2-4 years of experience, strong skills in Angular and TypeScript, as well as familiarity w ...

Hybrid Software Engineering Lead Risk & Regulatory

A leading online gaming company in Stoke-on-Trent is seeking a Software Development Team Leader to drive innovation and mentor a talented team. You will oversee the software development life cycle while navigating a fast-paced environment. Key qualifications include expertise in backend languages such as .Net or ...

Defence Tech Lead: Backend & AI Engineer (SC Eligible)

A cutting-edge AI company in Greater London seeks a Lead Software Engineer to spearhead backend and edge/IoT engineering for Defence projects. This role requires leading a team, designing complex components, and implementing CI/CD processes. Proficiency in Python and at least one compiled language is essential. ...

Senior Full Stack Engineer – AI Systems (London, Hybrid, Equity)

SR2 REC LTD is seeking a Senior Full Stack Engineer to design and build high-quality backend systems using Python and create scalable frontend architecture with React and TypeScript. The role is hybrid based in London, offering a salary of £120,000 to £140,000 plus equity. Ideal candidates are those who enjoy ta ...

Frontend Developer (React.js)

RemoteStar is hiring a Frontend Developer (React.js) on behalf of a fast‑growing UK cybersecurity company delivering innovative solutions to protect businesses from digital threats. About the role As a React Developer, you’ll build modern, responsive, and secure web interf ...

AI Reliability & Test Automation Engineer

We are building real-time conversational AI systems powered by LLMs, ASR, and TTS. Our products evolve quickly, with new services, workflows, models, and customer-facing features constantly being developed. We are looking for an AI Reliability & Test Automation Engineer to work directly within the LLM AI t ...

Senior Developer C# React Investment Banking

About Talan At Talan, we deliver technology solutions in partnership with leading global clients. We are currently supporting one of our long standing clients in building and enhancing a front office risk and valuation platform used in a fast paced, real time environment. Job Descr ...

Senior Software Engineer (Node.js / TypeScript / AWS)

Senior Software Engineer Our client. a fast-growing technology company is seeking a Senior Software Engineer to help architect and build a next-generation real-time platform from the ground up. Working closely with a small senior engineering team, you will design and deliver scalable back ...

Senior Software Engineer (Node.js / TypeScript)

Senior Software Engineer (Node.js / TypeScript / AWS) Our client. a fast-growing technology company is seeking a Senior Software Engineer to help architect and build a next-generation real-time platform from the ground up. Working closely with a small senior engineering team, you will des ...

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    Backend Developer Python Nodejs Jobs in United Kingdom Job Search Guide, Trends and Insights