Top Software Engineer Jobs in London

As a Senior Software Engineer II, you will build advanced video forensics capabilities, design scalable systems, mentor engineers, and drive cross-team collaboration.

Develop and maintain high-concurrency C# services for real-time emergency call-taking and dispatch. Implement SIP signaling, RTP/RTCP media handling (MCPTT/MCVideo), MCData handlers, XCAP/XML processing, and secure media via OIDC and MIKEY-SAKKE. Work in an Agile team, apply asynchronous network programming, and contribute to CI/CD workflows.

Design, build, and operate Rive's backend services powering core APIs, real-time collaboration, asset storage, marketplace, authentication/billing, observability, and large-scale background processing. Focus on database architecture, scaling, reliability, security, and performance while collaborating across teams.

Design and implement scalable graph-based search services and APIs. Build backend systems using Java and Spring Boot, integrate AWS services and databases, ensure observability with New Relic and Coralogix, and champion clean code and engineering best practices while collaborating across product and engineering teams.

Design, build, and maintain automated test frameworks for embedded and connected medical devices. Define test plans for firmware, device drivers, APIs, connectivity, OTA updates, and WebUI. Integrate tests into CI/CD pipelines, collaborate with hardware/firmware teams, debug system-level issues, and validate device performance under real-world conditions. Must commute to London office 3–5 days/week.

Develop reliable cloud services on the hyperscaler platform, contributing to cloud infrastructure, databases, and monitoring systems. Must write reliable code with team-oriented skills.

Design and build backend systems for Quadrivia's clinical AI platform, ensuring reliability, high availability, and compliance with healthcare regulations while collaborating with cross-functional teams.

Lead backend and edge/IoT engineering, implementing scalable solutions and mentoring team members while collaborating with Data Science teams.

The Principal Software Engineer will ensure the reliability and scalability of AI systems, leading infrastructure improvements and optimizing ML workflows.

The Senior Software Engineer will enhance the reliability of AI systems, implement monitoring frameworks, manage failover systems, and lead incident responses, focusing on serving infrastructures for large language models.

Lead the evolution of core search and indexing capabilities at Elastic. Research, define, and drive innovations in search infrastructure including Lucene, while collaborating with product teams and mentoring engineers.

As a Senior Engineer in AI Adoption, you will architect scalable systems, build CI/CD infrastructure, manage AWS workloads, and lead the development team in delivering high-quality tech solutions.

As a Senior Software Engineer, you will develop web and desktop applications, guide projects, mentor junior engineers, and ensure high-quality code delivery.

As a Full-Stack Senior Software Engineer, you'll build and evaluate systems for a Generative AI assistant, working on data pipelines, APIs, and user-facing features while ensuring quality and compliance.

Lead architecture and development of advanced software systems, mentor engineers, evaluate new technologies, and ensure software meets requirements.

Design, build, and optimize low-latency, high-throughput trading APIs (REST, FIX, WebSocket). Own core trading services, improve data correctness and reliability, collaborate cross-functionally, and support systems via on-call rotation.

Work across the full software lifecycle to build robust margin and collateral solutions. Collaborate with product teams and users, design and implement RESTful APIs, apply TDD and clean code, and handle data structures, algorithms and SQL. Adapt quickly in a fast-paced, changing environment and contribute to a strong global engineering culture.

Design and implement a distributed control plane for Confluent Cloud offerings, utilizing Kubernetes and various programming languages, while supporting the product lifecycle.

Lead the Market Making Engineering team in developing real-time quoting systems, collaborate with stakeholders, and enhance software and processes.

Design and evolve systems for Motion's infrastructure, focusing on reliable and secure operations across APIs, Linux systems, and cloud environments with a focus on hands-on coding and engineering judgment.

Implement and maintain WebExtensions APIs and addon management in Firefox, debug extension issues, build related UI, collaborate across teams, contribute to Mozilla-owned add-ons, support extension developers, and participate in open-source workflows (code reviews, Bugzilla/GitHub).

The Software Engineer will design, develop, and support the MEMX Trading system software, focusing on production support during US evening hours.

Lead architecture and strategy for Athena: build production-grade distributed systems that validate, deduplicate, and route vulnerability data; move prototypes to reliable, observable pipelines; set technical standards, scale the team, and partner on product and operational decisions.

Design, build, and ship production-ready software; decompose ambiguous problems into system architectures; modernise legacy systems and develop greenfield features; own technical decisions, testing, observability, and documentation; collaborate with product and design and ensure operational readiness.

Design, build, test and maintain scalable software using Node/TypeScript and AWS. Contribute to architecture, estimation and product planning, mentor juniors, apply security and performance best practices, and support CI/CD and live-application troubleshooting.