Top Software Engineer Jobs in London

Design and implement software solutions for government clients, ensuring high quality and adherence to coding standards while collaborating with cross-functional teams.

The Software Engineer will design, develop, and maintain platform features for Edenred PayTech, collaborating with teams to ensure software meets quality standards and project specifications.

The Software Engineer will develop AI-based capabilities, maintain software stacks, mentor others, and tackle engineering challenges across various technical fields.

The Senior Back-End Software Engineer will implement features, improve logic, write integrations with APIs, and contribute to design discussions within a startup environment.

Software Engineers at PDT develop and maintain trading systems, risk controls, and post-trade technologies while collaborating with internal users to define requirements and implement solutions.

Develop cutting-edge networking software for Cisco’s IOS XR operating system, contributing across design, coding, testing, delivery, and support. Work may span low-level build and installation infrastructure through manageability and routing applications. The role is suited to highly capable graduates with strong academic records, enthusiasm for software development, collaborative skills, and a passion for building a long-term software engineering career. Comprehensive training is provided, and prior software experience is useful but not required.

In this role, you'll develop reliable Python systems for trading operations, collaborate on projects, debug issues, and provide operational support.

Software engineering intern working with the Cisco Ensoft team on Cisco IOS-XR components for carrier and data-center routers. The role involves contributing to an 8–10 week project through software design, coding, testing, agile processes, and AI-enabled workflows. Applicants should be UK university undergraduates studying a numerate degree, have sufficient programming experience to become productive quickly, and enjoy collaborative work.

Lead architecture and full-stack development of AI-powered platforms, build scalable frontend and backend systems, mentor engineers, translate client problems into production-ready solutions, and ensure high code quality and reliable deployments.

Design, build, and evolve production-grade trading platforms and data-serving services. Optimize performance, throughput, and efficiency at scale while improving reliability, testing, automation, code quality, and observability. Participate in production support rotations, troubleshoot incidents, and drive operational improvements across distributed data systems.

Join a new London engineering hub to design, build, and maintain scalable backend services. Deliver features, ensure quality and maintainability, participate in agile teams, and grow across the Java/Spring cloud stack.

Build backend systems and data pipelines to process large-scale protein characterization data, design APIs to integrate lab instruments and robotics, and collaborate with scientists and automation engineers to turn molecular biology workflows into reliable, scalable software for automated wet-lab execution.

As a Senior Software Engineer at Relay, you will tackle challenging problems, collaborate with talented teams, and have a direct impact on the company's growth through software development and optimization tools.

Provide Level 3 technical support for UK government customers, diagnosing complex issues and delivering code-level fixes. Support go-live activities through workflow updates, UI changes, report creation, database scripting, integration configuration, hotfixes, patches, and upgrades. Collaborate with development teams, manage customer requests through CRM processes, create knowledge-base content, respond to enhancements, and participate in an on-call rotation. The role requires SC clearance eligibility, a British passport, and occasional customer visits.

Develop and maintain Joybuy backend systems ensuring high performance, availability, concurrency, security, and scalability. Identify and mitigate technical risks, implement monitorability and rollback strategies, research and adopt new technologies, and integrate emerging tech into global architectures to drive technical growth.

Build and launch a stealth AI product from concept through production. Own product features end-to-end, make architecture decisions, define MVPs and success metrics, and ship software using AI throughout the SDLC. Improve engineering delivery metrics, testing, CI/CD, observability, and release practices while partnering with Product and Design. Mentor engineers and help establish a high-ownership culture.

Design, build, and operate Anthropic’s MCP proxy, OAuth, and token-management infrastructure. Own reliability through SLOs, on-call support, incident response, and postmortems. Develop enterprise administration controls and permission models, contribute to the MCP standard and Python and TypeScript SDKs, scope complex multi-month initiatives, drive cross-organizational alignment, and help productize advanced AI capabilities.

Build and operate Kubernetes-based infrastructure and tooling to support development, testing, deployment and scaling of Graphcores ML software. Manage cloud infrastructure, CI/CD practices, and collaborate with software teams to improve reliability and observability of HPC AI platforms.

Design, deploy, and maintain tools and services for build, CI/CD, packaging, and releases. Manage cloud and Kubernetes infrastructure, use IaC, reduce toil, and support junior engineers for reliable ML software delivery.

The Senior Staff Engineer will lead the development of a Risk Assessment Platform, focusing on system optimization, data integrity solutions, and technical leadership.

Build and operate algo1’s platform infrastructure, including authentication and authorization, automated release engineering, cloud environments, APIs, webhooks, event-driven systems, and agentic development tooling. Design scalable distributed backend services, manage databases and real-time data streams, and support reliable customer-facing products. The role is office-based in London and involves close collaboration with platform, product, and engineering teams.

Design, implement, test, secure, and maintain backend services for commercial journeys. Collaborate with product and cross-functional engineering teams, embed testing and security standards, contribute to CI/CD pipelines, and participate in engineering communities and agile delivery practices.

Build and enhance backend, event-driven payment services within a distributed systems platform. Contribute to microservices, streaming, and event-sourced architectures, participate in Agile Scrum teams, write well-tested code, support production reliability, and collaborate with product and engineering stakeholders while learning modern JVM-based development practices.

Develop high-performance, cloud-first applications for Premium Cricket using specification-driven development (ATDD/BDD). Use C#, modern .NET, asynchronous programming and LINQ, integrate front-end React components, work with AWS/serverless and GitLab CI, and leverage AI-assisted tools to accelerate development and maintain code quality for real-time sports data services.

The Software Engineer in Test for Android will develop UI automation solutions, mentor teams, and ensure quality in mobile applications. Responsibilities include improving test coverage, collaborating with engineers, and advocating for quality practices throughout the software delivery lifecycle.