Top Software Engineer Jobs in London

Design, build, test, and operate IAM and platform services across the stack. Implement APIs, models, workflows, and orchestration surfaces. Research and prototype AI agent identity solutions, collaborate with product and UX, participate in design, coding, testing, rollout, and production support, and mentor other engineers.

Lead and implement backend and developer-experience initiatives across Clojure and Go systems. Define architecture, build and operate distributed services, event pipelines, databases and APIs, improve observability and reliability, mentor senior engineers, and drive cross-team delivery from ambiguity to measurable outcomes while participating in on-call rotation.

Design, build, and operate Go-based services powering Docker's secure build and CI infrastructure. Deliver isolation, identity, policy, provenance, attestation and signing capabilities, improve reliability of Docker Build Cloud and Auto Builds, own features end-to-end, participate in on-call rotation, and collaborate with product, security, and platform teams to produce secure, reproducible developer and agent workflows.

The Senior Software Engineer will design and enhance data and infrastructure platforms, support systematic trading strategies, and collaborate with investment teams in a fast-paced environment.

Build and maintain high-throughput, reliable database integrations to replicate data into ClickHouse. Debug production issues, improve observability and reliability, participate on-call, collaborate with customers and cross-functional teams, and influence product roadmap.

As a Senior Software Engineer, you will build scalable distributed systems, improve developer experience, mentor peers, and lead incident responses.

Develop and maintain Risk Intelligence KYC products (World-Check One/Verify). Implement and improve API Gateway services, migrate services to cloud (AWS), build secure, highly available and scalable microservices, collaborate with cross-functional teams, use agile practices, CI/CD and monitoring, and support production systems.

Design, implement and extend high-performance C++ functionality for pan-European equities trading systems. Own features end-to-end, ensure quality and production readiness, diagnose and resolve production issues, mentor engineers, interview candidates, and provide out-of-hours support as needed.

Lead development of secure, resilient web applications, APIs, and microservices for MoD programmes while integrating native Android (Kotlin/ART) background services, IPC/AIDL, and tactical data routing (CoT). Ensure Secure by Design and Def Stan compliance, automate CI/CD/DevSecOps pipelines for cloud and air-gapped environments, and mentor mid-level engineers during Agile client delivery.

Lead quality engineering for SDK teams by building CI/CD, automation, tests, diagnostics, and reporting. Improve test strategy, observability, developer feedback, and reliability across Linux and Windows. Investigate and fix build/test/deploy issues, mentor peers, coordinate cross-site initiatives, and apply AI-assisted tools responsibly to increase engineering productivity and test effectiveness.

The Senior Software Engineer will collaborate in small teams to develop and maintain backend and frontend components, focusing on high-availability systems, writing tests, and continuous delivery on Google Cloud Platform.

The Senior Software Engineer leads project subsystems, mentors junior engineers, and designs scalable SaaS solutions while optimizing performance and ensuring code quality.

Lead architecture for large-scale, high-availability distributed systems using Domain Driven Design. Provide project-embedded consultation, prioritize platform capabilities, drive CI/CD and cloud practices, and communicate technical strategy to stakeholders to ensure scalable, secure, and observable systems.

Design, build and deliver Endpoint Privilege Management features across the stack. Use AI-assisted tools, collaborate with distributed cross-functional teams, diagnose and resolve complex production issues.

Build and operate backend systems enabling enterprise deployments of Coder. Design and implement scalable backend architecture, improve upgrade and migration reliability, investigate and resolve production scalability issues, own operator-facing backend features, document tradeoffs, participate in design reviews and on-call rotations.

As a Senior Software Engineer, you'll architect, build, and deliver features, collaborate with teams, maintain CI/CD pipelines, and support team members in technical matters.

Lead and architect an area of the enterprise product, write production code, mentor and manage engineers, conduct code reviews, own technical decisions, collaborate with PMs/designers, promote security best practices, and contribute to roadmap and stakeholder communication.

The Senior Software Developer will design and build scalable cloud-based services, mentor junior engineers, and contribute to high-quality backend system architecture and continuous improvement processes.

Design, build, and operate backend services and infrastructure powering Rive’s editor, real-time collaboration, file/asset storage, marketplace, authentication/billing, observability, and distributed background systems. Focus on database design and optimization, scalability, reliability, security, and cloud infrastructure (AWS/IaC).

Lead and implement architecture and code for resilient backend systems, embedded hardware, secure networking, and ML inference at the tactical edge. Mentor engineers, run code review and RFC processes, optimise performance and reliability, and drive cross-team technical initiatives from prototype to production.

The Principal Software Engineer will architect AI-enabled platforms, mentor senior engineers, and lead cross-team architectural discussions, with a focus on secure, scalable solutions on AWS.

Design and enhance tools for developer productivity and infrastructure; improve CI/CD pipelines, optimize performance, and mentor team members.

Seeking a Senior Software Engineer for a freelance role focused on building digital products, requiring fullstack expertise with Kotlin and React, and experience in financial services.

Seeking a Senior Software Engineer to deliver high-quality digital products, lead teams, engage clients, and adapt to various technologies in an agile environment.

Lead technical teams to design, build, test and maintain modern, scalable software. Provide technical ownership (architecture, estimation, planning), coach and develop junior staff, ensure CI/CD and testing practices (e.g., TDD/XP), and liaise with customers.