Top Software Engineer Jobs in London

Develop scalable backend services and APIs, create coding tasks and deterministic verifiers for AI systems, debug complex codebases, optimize performance, refactor legacy systems, implement features, and provide technical reviews and reasoning. The role is remote, contract-based, and part-time at 15–20 hours per week.

Build and evolve responsive React frontend applications for customers, partners, and internal users. Design and implement accessible, reliable interfaces and interactive workflows using TypeScript and modern frontend architecture. Contribute to agile product development, testing, CI, performance, maintainability, cross-browser compatibility, and internationalization while collaborating within a cross-functional team.

Build and scale backend systems for Wise’s recipient management experience. Responsibilities include developing distributed systems, designing and maintaining RESTful APIs, optimizing relational and non-relational databases, creating scalable schemas, and driving technical vision. Collaborate closely with product, design, and analytics teammates in an autonomous agile team while applying testing, code reviews, and best coding practices to solve customer problems.

Build and operate reliable production data pipelines, ingestion systems, orchestration, customer data connectors, and infrastructure as code. Manage AWS-based data infrastructure using Terraform, Fivetran, AWS DMS, dbt, PostgreSQL, Lambda, and related services. Develop secure, enterprise-grade integrations for HR and payroll systems, and help connect trusted data to AI agents through MCP connectors and semantic data layers. Collaborate with product stakeholders to design scalable solutions meeting enterprise security and reliability standards.

Design and build production-grade mission, behavior, and motion planning systems for autonomous ground support vehicles in airport environments. Responsibilities include selecting planning algorithms, defining software architecture, optimizing trajectories, handling uncertainty, collaborating with perception and controls teams, promoting functional safety practices, and mentoring engineers. The role requires strong C++ or Python skills, Linux experience, autonomous systems planning expertise, and the ability to independently solve complex technical problems.

Own and productionize localization, mapping, calibration, and state-estimation systems for autonomous ground vehicles operating at active airports. Responsibilities include sensor fusion, 3D mapping, calibration, online validation, diagnostics, regression testing, deployment, and safety monitoring. The role provides technical leadership across perception, planning, and platform teams while advancing autonomous operations toward driverless capability.

Lead development of production-grade real-time control software for advanced robotic systems. Design control architectures, implement deterministic control loops, industrialize research algorithms, and integrate software across embedded and Linux-based platforms. Establish testing, release, safety, reliability, and performance standards, including simulation, hardware-in-the-loop, regression, and profiling. Collaborate with hardware and safety teams on fail-safes and graceful degradation, while mentoring engineers and guiding the control software roadmap.

Participate in a structured software development internship with two weeks of technical training followed by a seven-week project embedded in Maven engineering teams. Collaborate with developers and traders on real-world technology problems, learn C++, C#, Python, TypeScript, React, and emerging AI technologies, use in-house tools, and receive ongoing mentoring and feedback.

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 deploy AI-powered solutions directly with clients and internal delivery teams. Responsibilities include scoping ambiguous problems, designing LLM and retrieval workflows, developing scalable backend and infrastructure systems, optimizing operational workflows, translating messy data into technical architectures, iterating with stakeholders, and creating reusable deployment tooling. The role also involves client communication, end-to-end project ownership, customer on-call support, travel for client engagements, and hybrid office work.

Build and deploy software solving complex problems for Stripe’s financial infrastructure. Collaborate on multi-person coding projects, learn unfamiliar systems, communicate clearly with stakeholders, and use mentorship and independent research to deliver reliable solutions. Engineers may work across frontend, backend, infrastructure, and other areas while reviewing code, safely updating production systems, navigating large codebases, and leveraging AI tools with rigorous judgment.

Software engineering interns at Stripe contribute to production software across the technology stack, participate in technical design and code reviews, collaborate with engineers and stakeholders, and deliver projects with meaningful business impact. Interns learn unfamiliar systems, communicate project status, use AI tooling responsibly, and develop high-quality, well-tested code with mentorship and feedback.

Develop and maintain data pipelines, processing workflows, infrastructure-as-code, containers, and CI/CD pipelines using Python, Spark, Airflow, AWS, Terraform, Docker, and GitLab. Integrate secure data exchanges, support platform products, build Jupyter notebooks, and contribute to architecture, testing, code reviews, Agile delivery, performance, and security. The role also mentors junior developers and collaborates with data engineering, DevOps, and product teams.

Develop backend software in C# .NET within an agile delivery team. Responsibilities include system design, coding, technical documentation, automated testing, collaboration with product managers and test engineers, and maintaining high-quality mission-critical software. The role is remote with occasional travel and supports a UK emergency call-taking and dispatch platform.

Design, build, and maintain scalable backend services for Kaluza’s energy retail platform. Responsibilities include developing event-driven systems, optimizing SQL and NoSQL databases, using AWS and serverless architectures, monitoring production services, and collaborating with product and engineering teams. The role also involves mentoring colleagues, promoting engineering best practices, and owning services from architecture through continuous improvement.

Build and scale Base360.ai’s short-term rental platform, including customer-facing applications, APIs, automation engines, AI-powered workflows, third-party integrations, and cloud infrastructure. Develop systems for reservations, pricing, payments, guest communication, property operations, reporting, and financial workflows. Own projects end to end, make architectural decisions, ensure reliability, and deliver scalable products in a remote-first startup environment.

Hands-on senior fullstack developer building backend-led JVM services (Kotlin/modern Java) and responsive React/TypeScript frontends. Design APIs, event-driven workflows, tests, CI/CD pipelines, observability, and contribute across discovery, deployment, production support, and technical decisions while validating AI-assisted tools where helpful.

Develop and enhance automated testing strategies across unit, component, integration, system, and end-to-end levels. Design test plans, investigate defects, perform exploratory and performance testing, and improve CI/CD pipeline reliability. Collaborate with QA, development, DevOps, and business teams to expand coverage, improve quality practices, and validate distributed systems. Build containerized test environments, use observability and chaos testing, and promote a culture of shared quality ownership.

Develop and deliver Java-based microservices across the full lifecycle, write automated tests, participate in agile ceremonies, triage and resolve issues, and improve platform quality, stability, and performance.

Architect and deliver resilient, high-performance cloud services for SailPoint’s identity platform using Golang and Angular. Design synchronous and event-driven microservices, build scalable SaaS features, improve performance and reliability, conduct architecture and code reviews, and mentor engineers. The role includes collaboration with product and architecture teams, participation in a 24x7 on-call rotation, and leadership across Policy Engine and agentic identity initiatives.

Design, build, deploy, and operate full-stack microservices for SailPoint’s Policy Engine. Develop scalable distributed systems using Golang and Angular, write unit and integration tests, debug and profile complex services, participate in on-call support, lead design reviews, mentor engineers, and contribute to technical roadmaps and architectural initiatives.

Detect, investigate, and respond to security incidents; maintain logging and SIEM operations; build detections and visibility; support PCI/SOC2/ISO audits; manage endpoint, email, and GitHub security; collaborate across teams and improve on-call and security tooling.

The Principal Software Engineer will ensure the reliability and scalability of AI systems, leading infrastructure improvements and optimizing ML workflows.

Contract software engineering role for a remote Europe-based engineer building scalable, resilient backend products with client teams. Responsibilities include backend development in Go, API and SaaS platform development, cloud infrastructure, distributed systems, containerized deployment with Docker and Kubernetes, testing with TDD, and performance optimization. The role also involves technical communication, collaborative problem-solving, and thoughtful use of AI tools.

Lead quality engineering for membership and loyalty capabilities, designing and executing functional, integration, API, contract, automation, and end-to-end tests. Build reliable test suites, validate loyalty points and personalized recommendations, manage test data, ensure cross-browser and cross-device quality, define testing strategies, and improve coverage using AI-assisted tools. Collaborate with engineering and product teams throughout the software development lifecycle while leading quality engineers in the loyalty and personalization area.