Top Software Engineer Jobs in London

Lead design and implementation of scalable backend and frontend systems, own domains end-to-end, set technical strategy and architecture, mentor engineers, drive cross-team initiatives, and improve reliability, performance, testing, monitoring, and CI/CD for customer-facing microservices.

Entry-level software engineer for Samsara's IoT platform. Work across backend, full-stack, mobile, or embedded teams to build scalable data ingestion, user experiences, and device software. Immediate ownership of production projects, collaborate with product/design, and use modern stacks and AI tools to ship features that impact customers.

Lead engineering of metadata, meta-modelling, and distributed systems; produce and review secure production Scala/Java code; drive adoption and governance of AI-assisted engineering across the SDLC; influence product design and operations; mentor technical teams; establish automation, validation standards, and reuse of proven patterns.

Lead the design and delivery of metadata, meta-modelling, and distributed systems. Develop and review secure, high-quality Scala/Java production code, adopt AI-assisted engineering practices, improve automation and operational stability, and apply cloud-native and SDLC best practices within an agile team supporting financial services applications.

Develop, test, and maintain modular, high-performance applications and RESTful APIs across the full SDLC. Write maintainable C#/.NET code, implement automated and unit tests, perform code reviews, troubleshoot issues, and collaborate using CI/CD and source control.

Build high-performance tools and large-data research platforms to enable trading strategies. Work in small engineering teams to design systems, develop platforms and web frameworks, and apply techniques such as distributed computing, NLP, and machine learning to solve complex problems.

Build and ship agentic LLM systems for Treasury: cash monitoring, funding execution, narrative generation, and discovery-to-deployment pipelines. Create reusable agent infrastructure, governance, evaluation, and partner with engineering to ensure data accuracy while embedding with operators to scope and iterate solutions.

As a Software Engineer at Citadel, you will build systems for investments, collaborate with researchers, and tackle complex problems.

Join the International Accelerator full-stack team to design, build, and operate Direct-to-Consumer products across international markets. Break projects into tasks, collaborate with PM/design/analytics, build and monitor APIs and web apps, support on-call and availability, participate in hiring and team growth, and write clear, well-tested, maintainable code.

Build and maintain real-time, latency-sensitive front-office trading UIs using React and TypeScript. Design UI architecture, integrate with APIs and real-time data, optimize performance, ensure security and resiliency, participate in CI/CD, troubleshoot production issues, and collaborate globally across product, UX, QA, and backend teams.

Responsible for building applications and workflows based on customer data, solving critical problems, and automating processes while working closely with stakeholders.

The Forward Deployed Software Engineer develops impactful applications for clients, utilizing data-driven solutions to enhance business operations while collaborating closely with stakeholders.

Design and develop software solutions, analyze complex problems, and provide support for trading activities in a dynamic environment.

Build and maintain secure, production-ready ML solutions and cloud frameworks using Python and AWS. Collaborate with data scientists, platform teams, SRE, and engineering communities to integrate, deploy, monitor, and scale AIML systems following SDLC and MLOps practices.

Lead software engineer on AI/ML data platforms building secure, cloud-native production systems. Designs, implements, debugs, and reviews code, drives adoption of AI-assisted engineering practices, mentors junior engineers, evaluates vendors, and ensures operational stability and secure SDLC practices.

Contribute code to Palantir's infrastructure platforms (Foundry, Gotham, Apollo) across backend, developer, frontend, and storage teams. Work on Kubernetes-based PaaS, deployment/change-management, and observability tooling to improve engineering velocity and reliability. Collaborate with engineers and non-technical stakeholders, learn quickly, and support developer workflows.

Embed with government customers to design, build, and ship custom software and LLM workflows. Own end-to-end projects, handle large-scale data, make architecture decisions, and maintain stakeholder relationships. Expect substantial travel and obtain security clearance. Responsible from first customer conversation through production delivery.

Build and maintain large-scale infrastructure for Palantir platforms (Foundry, Gotham, Apollo). Contribute to backend, developer, frontend, and storage infrastructure, Kubernetes-based PaaS, observability tools, and internal infrastructure used by sensitive environments. Collaborate across teams, write high-quality code, and improve developer productivity.

Embed with customers to design and ship custom, production-grade software and LLM workflows. Handle large-scale data, make architecture decisions, build front-end and infrastructure solutions, and manage stakeholder relationships while traveling 25–50% of the time.

Contribute production-quality code to Palantir products (Gotham, Foundry, Apollo); participate across the product lifecycle; collaborate with cross-functional teams; learn from a mentor; and engage with customers to understand real-world problems.

Build and ship production-quality software across Palantir products (Gotham, Apollo, Foundry). Participate in full product lifecycle, collaborate with cross-functional teams, learn from a mentor, and engage with users to solve data-driven problems.

Embed with customers to design and ship production software and AI solutions. Collaborate on architecture, handle large-scale data, build custom applications and LLM workflows, and manage stakeholder relationships while traveling to customer sites.

Embed with government customers to build production software and LLM workflows, handle large-scale data, collaborate on architecture/design, and own end-to-end projects. Interns travel (25–50%), engage directly with stakeholders, and are given meaningful responsibility from day one.

Design, implement, and maintain observability features: large-scale data ingestion/storage/processing, visualization tools, frontend integrations, reliability via testing, and collaborate across product, design, and infrastructure while engaging with open-source communities and user feedback.

Join an agile front-office Commodities tech team to design, develop, and maintain trading applications. Work with traders, quants, and middle office to gather requirements, deliver scalable, resilient production code, troubleshoot outages, and collaborate globally while improving code quality and contributing to engineering communities.