Backend Jobs in United Kingdom

Senior Python Backend Engineer — Remote, Scalable APIs

UKSenior

API Api Design Distributed Systems Django FastAPI +1 skills

Senior Python Backend Engineer at BitWords Inc. (London/Remote) building scalable Python services and high-performance APIs using Django/FastAPI. Day-to-day work centers on distributed systems, data processing, and API design, collaborating with data scientists and infrastructure teams to power products serving millions of users.

Matta Labs Ltd

Backend Engineer

AI API CI/CD Cloud Embedded Systems +5 skills

Builds and scales the backend of Matta's AI-powered manufacturing OS: designing FastAPI services, optimizing database queries, and creating APIs for edge devices handling thousands of real-time machine data streams, across edge compute and cloud. Core stack is Python with FastAPI, pydantic, Postgres, and SQLAlchemy.

Lead Backend Engineer, Cross-Border Payments Platform

UKLead

AI API Api Design Data Modeling

Lead Backend Engineer at Xe will help rebuild the cross-border payments platform, designing APIs, modeling data, modernizing backend services, and owning delivery and production reliability end-to-end. The role writes production money-moving code and expects daily use of AI in thinking, building, testing, and shipping.

Rightmove

Backend Engineer — Java/Spring Boot & Kafka (Hybrid)

Docker Elasticsearch Gradle Java Kafka +2 skills

Backend engineer at Rightmove, London's leading property portal, building and scaling services with Java 21+, Spring Boot, Kafka, Elasticsearch and Couchbase. The role owns features end-to-end in a cross-functional team, working hybrid from London.

BitWords Inc.

Backend Developer (Python)

RemoteUK

Agile API Api Design AWS Azure +23 skills

Build and maintain scalable Python backend services and APIs (microservices, database design, third-party integrations) handling millions of daily requests, working with frontend, data, and infrastructure teams. Core stack: Python with Django/FastAPI, PostgreSQL/MySQL, cloud platforms.

Backend/API Engineer, Money as a Service (Product)

Open 121d UK

API AWS Cloud Docker GraphQL +2 skills

Designs and maintains global financial APIs and services for Stripe’s Treasury products, handling billions of money movement requests with a focus on reliability and ergonomic interfaces.

SMPPL

Senior Backend Developer

UKSenior

Agile Confluence InVision Jira Sketch

Despite the Senior Backend Developer title, the posting's content describes product design work: leading the design cycle from discovery to user acceptance testing with BAs and PMs, building pattern libraries, and crafting pixel-perfect responsive UIs using Sketch, InVision/Framer X, Jira and Confluence in two-week agile sprints at a boutique UK printing company.

United States Digital Space LLC

Principal Backend Engineer – Distributed Systems Leader

On-siteUKPrincipal

Encord, the universal data layer for AI, is seeking a Principal Engineer to join our Foundations team in London. You will own the hardest architectural calls, design and lead major database and processing-system…

Gazelle Global Consulting Ltd

Backend Data / AWS Engineer

HybridUKContract

AWS Event Driven Architecture

Long-term contract role in London (hybrid, 2-3 days/week in office) owning a critical backend data layer that supports digital experiences, integrations and event-driven services. Day to day covers database design, performance, security, resilience and cost optimisation on AWS.

apron

Open 53d HybridUKFull-timeSenior

Senior Software Engineer | Backend

AI Backbone.js Fintech JVM Kotlin +3 skills

Builds and scales fintech backend systems for SMB cash flow tools (invoicing, expense cards) with JVM/Kotlin, focusing on fraud detection, financial integrations, and cross-functional collaboration.

M.A.C. Solutions Ltd

Software Developer Backend & AI

AI API C# .NET LLM +2 skills

Backend & AI software developer building secure, scalable C#/.NET services and APIs, integrating LLMs (OpenAI, Anthropic) into production features with RAG, vector search, agentic workflows, and SQL optimisation for large time-series datasets at the ProcessVue software division. Full-time hybrid role based in Chesterfield.

Backend Developer

Join a growing tech team as a Back End / Cloud Developer, designing and building scalable, secure cloud-based applications, services and APIs while collaborating with front-end developers. Hybrid role with one day a week in London.

Backend Developer

Open 51d UK

Agile Analytics API Api Design Authentication +26 skills

The Backend Developer will design, develop, and maintain cloud-based services, APIs, and databases for OrganOx's medical device platforms using C#, .NET, and Azure. This role involves working within a regulated environment to support clinical outcomes through secure, scalable software solutions.

BPM Tech

Backend Developer

HybridUK

Agile API AWS CI/CD Cloud +14 skills

Back End / Cloud Developer £60-£70k + benefits | Hybrid |1 day a week in London We’re looking for an experienced Back End / Cloud Developer to join a growing technology team and play a key role in building scalable,…

Salesforce

Member of Technical Staff, Revenue Cloud Rating – Backend Java Engineer

RemoteUKFull-time

Agentic AI AI Candidate Experience Claude Code Cloud +8 skills

To get the best candidate experience, please consider applying for a maximum of 3 roles within 12 months to ensure you are not duplicating efforts. Job Category Software Engineering Job Details About Salesforce…

Gazelle Global Consulting Limited

Backend Data / AWS Engineer

HybridUKContract

AWS Event Driven Architecture

Long-term contract role in London (hybrid, 2-3 days/week in office) owning a critical AWS-based backend data layer powering digital experiences, integrations and event-driven services. Day to day covers database design, performance, security, resilience, cost optimisation and working with external suppliers.

Carousel Consultancy Ltd

Backend Engineer - FinTech AI Platform

HybridUK

AI API AWS DynamoDB ECS +12 skills

Build backend services for a rapid-growth FinTech AI platform in London (hybrid, or remote within UK/Europe), working with Node.js/Python and AWS to design RESTful and event-driven APIs. Salary up to £100k plus equity.

Golang Backend Engineer, Financial Product Fraud

AI AWS Cloud Distributed Systems Event Driven Architecture +11 skills

Our Global Structure Deliveroo is now part of DoorDash, bringing together teams with even greater reach, scale, and ambition. Depending on your role, you may collaborate with teammates, systems, and leaders across…

Deliveroo

Software Engineer, Backend (BI Platform)

HybridUK

Agentic AI AI Analytics API Authentication +14 skills

Web3adaptive

Remote Backend Engineer (Graduate) - Digital Assets

Graduate backend engineer joining Elwood Technologies' Backend Engineering team in London, rotating across Backend and Market Connectivity to build, test, and deploy trading solutions for digital asset markets in a FinTech environment.