Top Software Engineer Jobs in London

Build and maintain backend services for Customer Engineering: triage and fix customer-reported bugs, deliver small feature requests, create automation and tooling to reduce manual work, debug microservices and event-driven pipelines, integrate identity providers and data security platforms, instrument and monitor systems, and partner with customers and stakeholders to prevent recurring issues.

Design, develop, test, and deliver features for Webex real-time media services. Work in agile teams on microservices, participate in on-call rotations, build automated tests, and apply AI tools to improve productivity and quality.

Lead Engineer will shape technical direction and build AI-native user-facing products across the stack. Responsibilities include end-to-end delivery, cross-functional collaboration, mentoring engineers, defining engineering practices for AI-enabled development, and hands-on frontend (React/Remix/TypeScript) and backend (Golang) work.

The Staff Software Engineer will lead the design and delivery of robust order management solutions, ensuring reliability and scalability, while mentoring junior engineers and collaborating across teams.

Lead design and delivery of order management and promising services: build resilient APIs and integrations, own features end-to-end, improve observability and operational excellence, mentor engineers, and shape technical direction to enable accurate delivery promises and scalable fulfilment.

Design, build, and operate backend platform capabilities for content and media: federated GraphQL, event-driven pipelines, APIs, automation, and developer/editor tooling. Lead architecture, deliver production-quality code, and enable teams via scalable, reliable services.

Lead the development of AI/ML infrastructure for simulations, collaborating with teams on model scaling, system design, and mentoring junior engineers.

The Staff Software Engineer will design and build backend platforms for content and media, develop APIs, lead architecture design, and act as a technical authority.

Lead full-stack development using Java/Spring and Vue/TypeScript. Design and guide scalable microservice and plugin-based platform architecture. Provide technical leadership on architecture, code quality and delivery. Apply lottery/gaming domain knowledge and design for regulated iGaming requirements such as KYC/AML, wallets, settlement and RNG where relevant.

Design, build, and maintain scalable backend systems and APIs using Go/Python. Integrate enterprise services, data pipelines, event-driven tech (Temporal, Kafka), and LLMs (OpenAI, Gemini, Claude). Ensure security, high availability, multi-tenant SaaS deployments, and improve engineering practices across the stack.

A mid-level C# .Net Back End Software Engineer responsible for the software development lifecycle, collaborating with teams, and maintaining software applications with a focus on Azure cloud services.

Design, ship, and maintain telecommunication capture services in a multi-cloud environment. Modernise and operate resilient audio/video capture platforms, support production systems, and collaborate with product and customer teams to deliver robust VoIP solutions.

The Principal Software Engineer will lead the development of containerized AI agents, guide architectural decisions, and enhance the cagent open-source project while mentoring team members.

As a Senior Software Engineer, you will lead technical solutions, analyze requirements, design and develop software, conduct peer reviews, and improve existing code in an Agile environment.

Lead end-to-end CPQ architecture and design across CRM and quote-to-cash platforms. Provide domain leadership for product configuration, pricing, quoting and approvals. Assess current Salesforce CRM/CPQ, define future-state architectures, evaluate CPQ technology options, and lead migration and transformation planning. Produce solution artefacts, design integrations, prototype configurations, and present to architecture review boards while communicating complex technical topics to technical and non-technical stakeholders.

As a DevOps Software Engineer, you will support the hx Renew platform, provide technical guidance, and mentor team members while tackling complex engineering tasks.

Product-minded full‑stack senior engineer (backend-leaning) to build and scale NHS-facing systems. Ship high-quality TypeScript/React code, design and consume APIs, handle distributed-systems risks, and influence product direction. Work autonomously in small squads, solve performance and usability issues, and deliver reliable experiences for clinicians and patients.

Lead development of core services and infrastructure using Ruby on Rails; mentor engineers; drive technical strategy and product decisions; address performance, scalability, and architecture; ensure high-quality delivery.

As a Senior Staff Software Engineer, you will architect scalable APIs, lead partner integrations, and drive engineering velocity while ensuring security and enterprise trust in DeepL's offerings.

Design, implement, and operate internet-scale crawling and ingestion systems. Build URL discovery, deduplication, scheduling, and extraction pipelines. Ensure high-throughput, reliable operation, monitor coverage/freshness/quality metrics, manage resource usage and costs, and collaborate with indexing and ML teams to meet retrieval requirements.

The role involves developing, testing, and deploying Python microservices, solving complex technical problems, and contributing to architectural decisions. Engineers will work with a product team and ensure code quality through reviews and testing, while continuously learning and improving practices.

Lead the development and maintenance of high-performance cross-platform desktop and mobile applications for HiFi audio. Drive technical direction, mentor team members, and innovate audio streaming solutions while ensuring product scalability and performance.

As a Software Quality Engineer at WRITER, you'll ensure high-quality, reliable AI-powered applications through comprehensive testing, automation frameworks, and collaboration with cross-functional teams, impacting global companies’ AI implementations.

The Principal Software Engineer will lead client engagements, mentor teams, and ensure technical decisions align with business objectives, focusing on software craftsmanship and modernization.

As a Staff Software Engineer at The Trade Desk, you will design, build, and deliver data-focused products, contribute to solution design, and mentor other engineers. You will work on large-scale distributed systems and collaborate in a diverse team environment to solve complex problems.