Top Software Engineer Jobs in London

As a Backend Software Engineer, you'll develop maintainable server-side code, collaborate with teams, and enhance product development while tackling technical debt.

Build and maintain North's Agents & Automations platform: design and ship frontend and backend features, execution engine, integrations, debugging, observability, evaluation, and feedback systems to enable reliable AI-powered workflows.

Build and maintain low-latency FX trading systems, design system architecture, collaborate with trading and quant teams, implement solutions, troubleshoot across software/hardware/networks, and establish best practices and documentation to support Citi's global FX business.

Develop and deliver production-grade cross-platform mobile features using React Native and native iOS (Swift). Collaborate with product, design, and engineering to integrate secure APIs, implement unit tests, optimize performance, and follow enterprise security and release processes (building, signing, TestFlight). Participate in code reviews, mentor peers, and promote secure coding and best practices within the Digital Loyalty & Rewards team.

Design, develop and maintain backend services and RESTful APIs using Java and Spring Boot. Deliver cloud-native deployments on OpenShift/RHEL, ensure secure coding and API compliance, implement CI/CD pipelines, participate in code reviews, and collaborate with product and engineering teams to support loyalty and rewards platform performance and operations.

Design, develop and customise Salesforce solutions (notably NPSP and Flows), support integrations and incidents across platforms, collaborate with stakeholders, and communicate progress to deliver fit-for-purpose digital solutions for Dogs Trust.

As a Backend Engineer, architect and build high-performance services for trading platforms, ensuring robust and observable systems. Collaborate with cross-functional teams and troubleshoot production incidents while leveraging AI tools for enhanced development.

Develop and maintain OpenTelemetry SDKs, libraries and collectors; build instrumentation patterns for C# and Python across Kubernetes and non-Kubernetes workloads; embed observability standards; scale telemetry backends and pipelines; improve incident response through better telemetry and AI-assisted engineering; support platform and application teams and participate in on-call rotation.

Lead end-to-end 0-to-1 product development: partner with executives to rapidly prototype and ship AI-enabled fintech products, balance rapid iteration with sound architecture, and own backend-heavy full-stack implementation from API design to frontend polish for global users.

As a Principal Software Engineer, you'll lead software architecture, mentor engineers, develop reliable systems, and guide cross-functional teams.

The Senior Software Engineer II will develop and enhance investment products, focusing on user experience and cross-team collaboration, while implementing clean code practices.

Design and build core on-chain and backend systems for a perpetual futures DEX, focusing on performance and simplicity. Responsibilities include implementing exchange logic and optimizing systems for efficiency.

Design and maintain scalable systems, collaborate with cross-functional teams, and enhance internal tooling while focusing on reliability and performance in infrastructure.

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

The Staff Software Engineer will design system architectures, write production code, mentor engineers, ensure system performance, and lead technical discussions.

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

As a Senior Software Engineer, you will enhance the platform's authentication, billing, and payment systems while adding features to the user interface. You'll be responsible for writing efficient code, ensuring high security and privacy standards, and managing software deployment processes.

As a Software Engineer, you'll lead AI implementation projects for the UK public sector, designing innovative solutions and engaging directly with customers to address complex challenges.

This role involves planning, executing, and documenting manual and automated tests for SaaS applications, focusing on quality assurance through collaboration and automation with Cypress. Responsibilities include bug reporting, improving regression confidence, and utilizing AI tools for testing efficiency.

Design, build, and lead highly available, event-driven microservices using Java and Spring Boot. Architect Kafka-based integrations, optimise PostgreSQL data models, influence platform-wide architecture, mentor engineers, and collaborate with product and partner teams to scale Wise's global payments and bank integrations reliably.

Lead design and implementation of core card spending experiences within the Spend domain. Write production code, shape technical designs, drive architecture, ensure reliability and scalability, define SRE/observability practices and testing strategies, mentor engineers, and coordinate cross-team initiatives across European hubs.

Own and build the core card spending experience: design and implement frontend and backend features, drive architecture and technical standards, improve reliability and SRE practices, coordinate cross-team deliveries, mentor engineers, and support banking integrations and complex transactional flows with a pragmatic, scalable approach.

Lead design and build of 0-to-1 fintech products in an internal innovation lab. Translate executive AI/strategy into MVPs, own full-stack implementations, make pragmatic architectural trade-offs, and bootstrap foundations for future product teams. Drive technical evaluation of AI/LLMs and balance rapid validation with maintainability.

The role involves designing and developing high-performance, real-time data processing systems using Apache Flink and Kafka, ensuring reliability and scalability while collaborating with various teams.

Lead complex projects and craft scalable software solutions while mentoring junior engineers. Optimize game engines for performance and quality.