Top Software Engineer Jobs in London

The Senior Full-Stack Engineer will design and build scalable UI systems, collaboratively own features, and support production quality. Responsibilities include API design, debugging, and performance tuning.

As a Software Engineer, you will build features, write maintainable Roblox Lua code, collaborate with teams, and enhance gameplay for millions of players.

As a Software Engineer II, you will build and maintain features on Stora's Rails-based platform, improve app stability, and collaborate with a small team on various domains.

The Sr. Software Engineer will design, develop, and maintain public APIs and integrations, ensuring high scalability and performance while improving code quality using AI tools.

As a Software Engineer in Sustaining Engineering, you will resolve complex issues related to Ubuntu and open-source software, engage with upstream communities, and develop bug fixes while maintaining close collaboration with support and product teams.

As a Python and Kubernetes Software Engineer, you will develop data analytics solutions using open source tools, collaborating with a distributed team.

The software engineer will develop and operate backend services for Snap Store and Charmhub.io, focusing on clean APIs and feature implementation.

The role involves developing software for Linux-based systems on autonomous devices, optimizing performance and ensuring reliability in various hardware environments.

As a Software Engineer at Canonical, you will collaborate globally to shape open-source software operations, focusing on Python and Golang development, enhance DevOps workflows, and improve infrastructure operations for cloud computing solutions.

The role involves designing and delivering open source software operations code in Python, ensuring system reliability, and collaborating with teams across the Linux stack.

As a Software Engineer (GenAI-Focused), you will enhance the DoiT Cloud Intelligence product, implement features, review code, and improve code health, focusing on AI and cloud technologies for cost optimization and performance.

The Software Engineer will design, develop, and install software solutions, focusing on web applications using PHP and ensuring coding standards and technical design compliance.

Responsible for building and maintaining Android applications with AI features. Focus on performance, UX design, and collaboration with backend and ML engineers.

As an iOS Developer, you will build and maintain AI-powered iOS applications focusing on performance, reliability, and user trust. Collaborate with engineers to integrate AI features, design UX patterns, and optimize app performance.

The Software Engineer will develop and maintain cross-platform desktop applications, focusing on performance, reliability, and integration of AI features. Responsibilities include optimizing applications, managing local data, and ensuring stability on macOS and Windows.

Senior backend engineer role building scalable, resilient Go-based backend services and APIs for cloud environments (AWS/Azure/GCP). Work with containers, Docker, Kubernetes, TDD, and performance optimisation while collaborating with client teams in a remote-first consultancy.

Senior software developer working across full delivery lifecycle: design, front-end/back-end development, integrations, workflow planning, QA, process optimisation, and client-facing delivery. Hands-on coding with Python and AWS; collaborate in agile teams and travel to client sites when required.

Design, build, and own aion's inference platform components (gateway, orchestrator, runtimes, autoscaler). Drive model deployment, rollback, routing, and GPU utilization optimizations. Implement low-latency, high-throughput distributed systems with observability, monitoring, and engineering best practices.

Develop and optimize performance-critical components of a low-latency trading platform (pricing engines, gateways, market-data, messaging). Own design, deployment, production support, observability, and architectural decisions. Mentor engineers, conduct reviews, and ensure reliability in cloud-native AWS and colocated environments.

Build and maintain low-latency trading infrastructure on Linux using modern C++ and Go. Work on pricing engines, connectivity, market-data pipelines, FIX integrations, messaging, observability, and production support. Own design, deployment, incident response, and continuous performance optimization.

The Senior Software Engineer will lead the development of Windows desktop applications, enforce best practices, manage feature lifecycles, and ensure accessibility compliance. Responsibilities include architecture design, collaborating with cross-functional teams, and resolving complex technical issues.

The Senior Software Engineer will build and maintain foundational services and SDKs, optimize functionality, and collaborate with product teams to enhance user experience at Speechify.

Design, implement, and ship customer-facing AI features end-to-end. Architect scalable, secure systems for high-volume data and complex workflows. Improve grounding, citations, and evaluation for auditable AI outputs. Collaborate with Product and Design to iterate and optimize latency, cost, and user experience.

Advance Firefox security architecture and cryptography stack by designing and implementing web platform security features. Improve browser reliability, performance, and memory efficiency. Debug and resolve security-sensitive, multi-threaded issues, contribute to standards-based implementations, and collaborate across teams on security initiatives, technical design, and planning.

Join a fast-paced team building a new digital bank platform from scratch. Develop backend services using JVM languages, design distributed systems, work on database development, and contribute high‑quality engineering across the platform.