Top Software Engineer Jobs in London

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.

Join an agile team to design and develop secure, scalable software services using modern technologies. Collaborate with customers and improve skills through learning and feedback.

The Golang Engineer will architect and develop the trading platform, ensuring performance and stability while integrating with bookmakers and optimizing trading processes.

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 role involves designing and implementing the Trading Data platform, focusing on the capture of order data and ensuring high availability and performance. Responsibilities include collaborating with teams to create scalable solutions, supporting the system, and owning project design and development.

As an Intermediate Software Engineer II, you'll collaborate with teams to develop web applications using TypeScript and React, mentor junior developers, and improve code quality through reviews and testing.

You will contribute to the inference platform, maintain APIs, support users, improve CI/CD, and ensure platform reliability.

Seeking a Full Stack Software Engineer with expertise in cloud platforms, full-stack development, and Agile methodologies to build data-driven solutions.

Responsible for managing the lifecycle of accelerator capacity, developing AI infrastructure, and driving cross-team initiatives while ensuring operational excellence and mentoring engineers.

Design, develop, and maintain low-latency electronic execution systems, collaborate with cross-functional teams, and enhance platform reliability and performance at scale.

Join Visa as a Software Engineer in Test, focusing on API testing, CI/CD integration, cloud solutions, and implementing QA best practices within an Agile team.

Seeking a Software Engineer for Regulatory Reporting to build backend systems ensuring compliance. Responsibilities include system design, data integration, and audit support.

The Software Engineer will develop and maintain backend services using Java and Spring Boot, collaborating in Agile teams to deliver scalable solutions. They will ensure system reliability and implement observability features, while supporting event-driven architectures and participating in CI/CD processes.

Join the Core Technology team as a Software Developer to enhance systems for Asset Management and Securities, collaborating with various teams to deliver innovative tech solutions.

Join a collaborative development team to design, implement, and maintain SaaS solutions, writing clean code and participating in Agile methodologies.

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.

The Software Engineer will build AI solutions for the Defence team, applying machine learning and high engineering standards while collaborating with technical teams.

In this role, you'll develop reliable Python systems for trading operations, collaborate on projects, debug issues, and provide operational support.

Build scalable, data-driven internal tools and services in Python; lead technical strategy to measure AI impact across tooling, data pipelines, and dashboards; own end-to-end features from requirements to observability; partner with engineering, data, and delivery teams; set squad technical direction and mentor junior engineers.

Design and build scalable applications using JavaScript or Python, implement data storage solutions, optimise performance, ensure testing and CI/CD practices, collaborate with clients and technical leaders, and maintain high code quality through reviews and agile delivery.

Design, develop, and maintain components of the LNIP intelligence core platform, including a semantic search API and internal data curation tool. Implement secure coding standards, unit testing, code reviews, and cloud deployments. Use agentic development tools responsibly and work with complex data models, vector embeddings, SQL and PySpark to support intelligent software systems.

The role involves building and scaling data infrastructure for multimodal AI systems, developing high-throughput data pipelines, and collaborating with ML researchers and product teams to enhance data systems.

The role involves designing and implementing robotic software architectures, developing solutions for robotics applications, optimizing performance, and mentoring team members, with a focus on system integration and communication protocols.

Build and ship polished, high-performance UI for the Codex desktop app and IDE extension. Partner with design to prototype and productionize interfaces for human↔agent workflows, own frontend architecture, improve reliability via testing and instrumentation, and integrate platform/model/backend capabilities.

Build end-to-end features for a TypeScript/Node/Electron desktop app and IDE extension. Design integrations with Rust services and the Codex CLI, own IPC architecture, implement orchestration for long-running tasks, and improve observability, reliability, and performance while partnering with product and design.