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Jackalope Digital LLC

Backend Engineer, EMEA — Remote & AI-Driven Ownership

GitLab is hiring an intermediate backend engineer to take backend features from idea to production in a fully remote, asynchronous EMEA environment — implementing services in Ruby/Rails or Go, designing APIs, and ensuring maintainability, performance, and observability while collaborating with Product, Frontend, Infra, and Security.

API GitLab Observability Rails Ruby

Jackalope Digital LLC

Senior Staff Backend Engineer — Remote

Staff-level backend engineer at GitLab who provides technical leadership across teams, drives modular architecture, and sets standards for scalable, secure systems. Day to day involves mentoring engineers, leading AI-assisted workflows, and collaborating with Product, Frontend, and Security in a remote-first environment.

Hanson Regan Ltd

Senior Backend Engineer - Fintech, Cloud & Distributed

Hanson Regan is recruiting a Senior Backend Engineer for a London-based UK fintech, building fast, resilient and secure backend systems for sophisticated workloads. Day to day centres on modern cloud engineering with Python/Go, Kubernetes, GCP and PostgreSQL.

Cloud Fintech GCP Kubernetes PostgreSQL +1 skills

Experian Information Solutions, Inc.

Senior Backend Engineer — Hybrid (AWS, Python, TDD)

Design, build, and operate backend systems for Experian in a hybrid London-based role, owning the full SDLC from requirements through deployment and production support. The core stack is AWS and Python with test-driven development, building APIs, reporting, and data-focused services alongside product and data science teams.

McGregor Recruitment

Backend Engineer 1861

Contract Backend Engineer (up to £800/day, hybrid) to build an enterprise connectivity and orchestration platform in Manchester, Leeds, Edinburgh or Bristol. Day to day: designing scalable backend services and REST APIs in Java, Python or Node.js, with microservices, Kafka-driven event architecture, OAuth/SSO security, and cloud-native CI/CD.

AI API Authentication Automation CI/CD +19 skills

up to 800 £ / day

Senior .NET Backend Engineer – Integration Lead (Hybrid)

A senior .NET engineer based in Belfast working in a small hybrid team to design and build RESTful Web APIs, delivering a major integration for an international customer and then expanding the backend platform while owning technical decisions.

McGregor Recruitment

Backend Engineer

A 3-month (extendable) contract backend engineer role, up to £800/day hybrid, building an enterprise connectivity and orchestration platform. Day to day you design scalable Java/Python/Node.js microservices, REST APIs, event-driven systems (Kafka), OAuth/SSO security and cloud-native deployments across Manchester, Leeds, Edinburgh or Bristol.

AI API Authentication Automation CI/CD +19 skills

up to 800 £ / day

.NET Backend Engineer — C#, Async, CI/CD, Agile

Polluxa is hiring a backend engineer in London to build and maintain high-volume transactional applications in C#/.NET. Day to day involves developing asynchronous services, participating in CI/CD workflows, and ensuring robust testing practices within a fast-paced Agile team.

Agile CI/CD C# .NET

Java Backend Engineer - AWS, Client-Facing FinTech

Builds backend services in Java on AWS for a UK-based, client-facing financial services programme, working with RESTful APIs and NoSQL while delivering production-grade software in a consulting environment with senior stakeholder engagement; .NET is a plus as it is used on the programme.

API AWS .NET Java NoSQL +1 skills

Square One Resources

Java Backend Engineer for FinTech Trade Platform

Designs and implements Java backend services for a high-performance fintech trade platform in London, working with Spring Boot, REST APIs and React integrations. Day-to-day involves debugging, performance tuning and delivering features collaboratively in an Agile, fast-paced team.

Agile API Fintech Java React +2 skills

C# Backend Engineer — Real-Time Trading Systems

Enfint, a global sports trading firm, is hiring a London-based engineer to design and build real-time trading systems, owning delivery from backend services to APIs on greenfield projects. The core stack is C#/.NET and ASP.NET with SQL/Oracle, plus some JavaScript/React frontend work.

API C# .NET JavaScript Oracle +2 skills

Senior Backend Developer

UKContractSenior

Senior Backend Developer on an initial 6-month contract (37 hrs/week, hybrid with 1 day/week in the London office) at energy provider Eon. Day to day: building serverless-first cloud apps with Python and AWS, designing REST/GraphQL APIs, and doing TDD, pair programming and code reviews in an agile team.

Agile API AWS Cloud Git +5 skills

Hanson Regan Ltd

Backend Engineer

Backend engineer at a UK fintech in London (~£90k) building and operating fast, resilient payments/financial-services systems using Python, Go and TypeScript on GCP and Kubernetes, covering APIs, data (PostgreSQL, BigQuery), event-driven processing and production observability.

AI API Argo CD BigQuery CI/CD +22 skills

Virtual Hire Staffing

Senior Java Web Engineer – Trade Platform Backend & UI

A mid/senior engineer builds backend services and web UI for an end-to-end trade management platform at a global financial markets infrastructure client in London, collaborating with architects and frontend developers. Core stack: Java/Spring Boot, REST APIs, React, SQL/PostgreSQL, Git, Maven/Gradle.

Agile API Git Gradle Java +8 skills

Backend Developer - Node.js & API Expert (Onsite ND)

HybridEuropeContractSenior

Senior Backend Developer on a 12-month daily-rate contract in North Dublin (3 days onsite per week), building scalable server-side logic, secure APIs, and robust back-end infrastructure. Core stack is Node.js/TypeScript, working with architects and integrating front-end and third-party systems in an agile environment.

Agile API Node.js TypeScript

Senior Node.js Backend Engineer - Hybrid Contract

HybridEuropeContractSenior

Stelfox is hiring a Senior Node.js Backend Engineer on a daily-rate contract with hybrid working in Dublin. The contractor designs and maintains server-side logic, APIs, and database schemas, integrating with front-end apps and third-party systems using Node.js, SQL/NoSQL, cloud, and CI/CD.

Agile API CI/CD Cloud Node.js +2 skills

Desenvolvedor back-end java sênior

Senior back-end developer at Estapar, Brazil's largest parking network, building scalable, high-performance applications with Java and Kotlin. Day to day: defining architectures, creating performance POCs, and maintaining services using Micronaut/Quarkus, AWS, Docker, MySQL, and REST/gRPC APIs.

API AWS Cucumber Docker EC2 +13 skills

Desenvolvedor (a) back-end java - sênior

Senior Java backend developer at Vericode working in rotation between sustainment (daytime monitoring and incident response for payment-arrangement APIs, 08h-20h) and project work building new features and evolving the platform. Core stack: Java, REST APIs, GCP (Spanner, BigQuery), Azure, PostgreSQL, automated testing and SonarQube.

API Azure BigQuery CI/CD Cloud +7 skills

Desenvolvedor back-end python - fortaleza

Backend Python developer maintaining and evolving Django REST APIs and corporate applications for a large Brazilian supplemental-health client. Day to day: building features, writing and tuning Oracle SQL for analytical reports, ensuring test coverage, and investigating production incidents with Elasticsearch and Datadog. Hybrid in Fortaleza (2 days/week on-site).

API Azure Azure DevOps CI/CD C# +12 skills

Backend Engineer

Open 32d HybridMENA

As a Senior Backend Engineer at BlinkOps, you'll architect and develop cloud-native microservices for their Agentic Security Automation Platform, using technologies like Kubernetes, Docker, SQL/NoSQL databases, and message brokers to ensure scalability and reliability.

Agentic AI AI Automation Cloud Cloud Native +9 skills