Top Software Engineer Jobs in London

Design, develop, test, and maintain high-performance C++ software. Lead architecture, optimize performance and memory, build multithreaded systems, write automated tests, support CI/CD, troubleshoot complex issues, mentor engineers, and collaborate with international teams.

As a DTN Software Engineer, you will develop and maintain DTN products, work on distributed systems, and collaborate with other engineers to innovate communication solutions.

Build and operate backend systems, workflow tooling, and data pipelines to support lawful data access requests. Implement least-privilege, audit trails, approval gates, and data-minimization. Partner with Legal and Operations, automate responsibly, and own production reliability, observability, incident response, and documentation while shaping privacy infrastructure.

Build and operate backend systems, workflow tooling, and data pipelines for lawful data access requests. Implement least-privilege access, audit trails, data minimization, and approval gates. Partner with Legal and Operations to translate requirements into secure, auditable, and operator-friendly systems. Own production reliability, testing, observability, and incident response while defining reusable privacy infrastructure.

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.

Work on an agile team building and maintaining mission-critical call-taking and dispatch software. Develop, document, and test features across frontend and backend using modern practices, collaborate with product and test engineers, and lead development for expansion products. Obtain required UK security vetting.

Owner of the asset discovery experience across tokens, perpetuals, and prediction markets. Design, build, and scale features for web, mobile, and browser extension platforms. Lead initiatives to add blockchain support and new products, interface with users and developers for feedback, and help grow and hire a high-performing Discovery team.

Lead the architectural vision and hands-on development of scalable, cloud-native API and event-driven systems. Drive engineering excellence across security, observability, performance, CI/CD and IaC; mentor engineers and influence cross-squad technical strategy; embed AI-driven engineering practices and build high-throughput Kafka-backed services.

Lead design and build of a greenfield, ultra-low-latency C++ trading platform covering execution, market data, order and risk management. Implement direct exchange connectivity, optimize microsecond/nanosecond performance, collaborate with traders and quants, own systems end-to-end from design through production support for live trading.

The Senior Software Engineer will architect and build backend systems, own clinical system integrations, improve performance, and shape engineering culture.

Build and scale Deliveroo's Android rendering layer for a server-driven UI platform. Design and implement client and backend systems (Kotlin, Golang, Protobuf), lead architecture and code reviews, own large initiatives and migrations, collaborate with iOS/Web/product/design teams, and mentor engineers while driving platform reliability and performance.

Develop and maintain FortiDLP server-side services, building APIs, databases, and integrations. Own features from design through delivery, write and review code and tests, ensure code quality and secure practices, collaborate cross-functionally, and support high-volume data pipelines and operational tasks as needed.

Lead architecture and technical direction for Console, a platform powering DeepLs enterprise product. Design integration contracts, access control, entitlements, and migration paths; drive standards, contract testing, DORA targets, and self-service patterns; align roadmaps with product teams and mentor engineers to raise platform quality and delivery velocity.

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.

Join a specialist Actuarial Software Development team as a full-stack developer, creating high-quality software solutions and product enhancements while managing IT controls and server management.

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.