Top Software Engineer Jobs in London

Work as part of an agile team to design, develop, document and test frontend features for a mission-critical call-taking and dispatch platform. Build high-quality JavaScript/React/TypeScript user interfaces, collaborate with product and test engineers, follow modern development practices (SOLID, Git, pull requests), and support an expansion product while occasionally travelling to UK offices.

Build and maintain production Golang backend services and data pipelines for an AI-driven investment platform. Design APIs, improve performance, reliability, and observability, debug production issues, and collaborate with AI and product teams to ship scalable, low-latency systems.

Design, implement, test and maintain network analytics software and internal tools. Translate requirements into specifications, produce technical design, write code and unit tests, collaborate with QA for testing, and resolve bugs pre- and post-release.

Design, build, and own front-end features across the full software lifecycle for a large-scale, distributed advertising platform. Deliver high-performance, user-focused UIs, collaborate with product and UX, write tests and monitoring, lead and mentor engineers, and drive complex cross-component changes.

Design, develop, and deliver scalable, secure software for port and terminal operations. Collaborate with stakeholders, apply DevOps/CI/CD and containerization, maintain high code quality, troubleshoot live systems, conduct code reviews, and mentor team members while recommending technical improvements.

Design, build, test, deploy, and support backend services (primarily in Go) and contribute to TypeScript frontends. Own full feature lifecycle, lead delivery, drive architecture and code quality, participate in reviews, mentor juniors, handle production support and on-call duties, and improve tooling and observability.

Design and implement flight software for satellites, ensuring autonomous operation and safe data management while collaborating across technical teams.

Own and ship front-end and full-stack product features from concept to deployment. Write well-tested code, improve frontend architecture and performance, maintain backend services and databases, design excellent UX, and lead technical customer engagements to translate feedback into product improvements.

As a Software Engineer, you'll improve code structure, engage in technical execution, and support team members while working on impactful projects.

As a Deployed Software Engineer, you will implement technology with customers, gather feedback, and collaborate on product feature development, requiring travel to diverse locations.

As a Software Engineer at Prodia, you will optimize image/video models, build APIs, and improve distributed job scheduling, focusing on fast and reliable performance.

As a Deployed Software Engineer at Arondite, you will implement technology with customers, travel to client sites, and develop tailored code for their needs while collaborating with the engineering team.

Develop Rust server software for AI inference stack, collaborate with hardware team, and conduct research for performance optimization.

Develop embedded firmware and systems software for management controllers, ensuring the reliability and safety of production-critical systems. Collaborate closely with hardware teams.

Develop software solutions to solve business problems at GSA Capital. A passion for technology is essential, finance background not required.

Join the UI team to build front-end components for a data-intensive trading and portfolio platform. Develop TypeScript/React grids, charts, and dashboards handling real-time streaming data with a focus on performance, accuracy, and collaboration with senior developers.

Design, implement, test, and maintain backend components of a low-latency trading and data platform. Build event-driven, concurrent distributed services in Go, optimise execution and algorithmic trading, support production systems and deployments, and collaborate with product, design, and engineering teams to deliver features and ensure platform reliability.

As a Software Engineer, you will design, build, and improve backend services and APIs, taking ownership of features and collaborating in product engineering. Responsibilities include working with modern AI tools, cloud development, and contributing to technical design and code quality in a collaborative team environment.

The Java Software Engineer will develop robust and scalable code for customer services using Java, AWS, and Postgres, while advocating for clean coding and best practices.

Design and build high-quality, low-latency trading GUIs; define interoperability standards (FDC3, REST/WebSocket); integrate AI-assisted tooling; drive UI performance engineering and architecture for large-scale front-end systems; champion TDD and CI/CD; liaise with UX/Product/Sales and mentor junior engineers.

Design, develop, test, and deploy Web3 components and backend services for Citi's digital asset platform. Build smart contracts, integrate blockchain networks and wallets, implement event-driven architectures, support custody and tokenization, participate in code reviews, and maintain secure, scalable production-grade Web3 infrastructure within Agile teams.

Design, build, and maintain end-to-end ETL pipelines and a shared ETL framework. Write tested mapping and validation code, perform code reviews, mentor junior engineers, and collaborate with product, QA, and client teams to deliver accurate, production-ready data integrations to regulatory standards.

12-month maternity cover Fullstack role owning features end-to-end across a dual TypeScript and C# backend. Build React microfrontend apps, work with event-driven AWS services (ECS/Fargate, Lambda, SQS, DynamoDB, DocumentDB), use AI coding agents to accelerate delivery, collaborate with product and customers, and shape architecture and developer workflows.

Own availability, performance, scalability and observability of mission-critical platform services. Build automation and tooling, participate in on-call rotations, lead incident response and postmortems, collaborate with product teams, and follow FinOps best practices to improve platform reliability and cost-efficiency.

Lead end-to-end delivery of complex backend features, mentor and upskill engineers, define engineering standards, participate in on-call rotations and incident escalation, conduct technical interviews, and drive improvements to development processes and tooling.