Top Software Engineer Jobs in London

Design and develop scalable backend services, APIs, data-processing systems, and platform capabilities for a cloud-native networking and security platform. Build high-performance services that collect, aggregate, and analyze data across distributed networks. Collaborate with product management, research, automation, and engineering teams to deliver secure, production-grade SaaS microservices and evaluate new technologies.

Build and maintain full-stack products using Python, React, GraphQL, and modern cloud technologies. Develop APIs, integrate internal and third-party services, create performant frontend applications, and deliver robust, scalable software across browsers and devices. Collaborate within cross-functional teams, contribute to design systems and component libraries, own features from inception through delivery, and promote maintainable coding practices. Bonus experience includes TypeScript, Next.js, AWS, infrastructure as code, event-driven systems, and AI tooling.

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.

Senior backend engineer responsible for designing, coding, and operating highly available distributed identity systems for Affirm’s international markets. The role includes owning quarterly goals, delivering scalable features in Kotlin and Python, collaborating across product and engineering teams, improving code and design standards, monitoring system availability, resolving production issues, mentoring engineers, and supporting technical planning and hiring.

Design, build, operate, and improve scalable distributed systems and cloud-native services supporting Capital Group’s investment processes. The role involves architecture and technology decisions, data pipelines and ETL/ELT workflows, quality and test coverage, root-cause resolution, agile collaboration, and delivering enterprise software into production. Engineers may also develop responsive web interfaces, APIs, financial analytics systems, and customer-facing features while using AI-powered engineering tools.

Build and operate international payment infrastructure supporting multiple countries, currencies, regulatory regimes, and banking rails. Design scalable multi-currency accounting and reconciliation systems, integrate with partners, launch new markets, and improve production reliability. Collaborate with compliance, product, operations, and external partners while owning solutions end to end from architecture through deployment and ongoing operations.

Dragonfly is seeking Software Engineers for various portfolio companies, focusing on crypto technologies. Engineers of all experience levels are needed across multiple stacks.

Staff Backend Engineer responsible for defining technical vision and architecture for Bitstamp’s exchange platform. The role leads cloud modernization, distributed systems integrations, low-latency infrastructure, scalability, resilience, automation, and high-severity incident response. It also includes mentoring engineers, leading design reviews, influencing cross-functional roadmaps, and supporting a 24/7 on-call rotation.

Software Engineering Interns will help design, maintain, and scale infrastructure supporting Talos’s digital asset trading and settlement platform. Responsibilities include contributing to CI/CD, infrastructure-as-code, deployment tooling, monitoring, logging, observability, and production performance improvements. Interns will collaborate with engineering teams to implement infrastructure requirements and gain exposure to distributed systems, cloud platforms, Linux, networking, and platform engineering during a 12-week summer internship.

Software Engineering Intern joining the Trading team for Summer 2027. The role involves building high-performance trading system features in Go, enhancing the Order Management System, designing components, contributing to architectural discussions, and adding analytics and metrics. The intern will collaborate with engineers to define requirements, demonstrate progress, and iterate based on feedback while supporting algorithmic trading capabilities and best execution.

Full-stack mid-level engineer building and operating secure research environments (frontend, backend, infrastructure). Work includes Typescript/Node development, IaC (Terraform), Azure/Kubernetes, data modelling, operational management, and collaborating with cross-functional teams to enable secure researcher access to sensitive health data.

Design and build backend services for a greenfield private-markets platform using Go, AWS, Kubernetes, and PostgreSQL. Own features end to end, including architecture, implementation, testing, deployment, observability, and production support. Contribute to distributed systems, API and data design, engineering standards, CI/CD, incident response, and AI-assisted development while collaborating with product, operations, and engineering stakeholders.

Develop and improve InstaLILY’s core AI platform, collaborating with product, design, UI/UX, and business teams to deliver reliable customer-focused features. The role includes writing software, testing, supporting CI/CD practices, maintaining technical quality, and staying current with AI and software engineering technologies. Candidates should have 0–2 years of software engineering experience, programming experience in Python and JavaScript, and familiarity with cloud computing or AWS, Azure, or GCP.

Build, review, and ship end-to-end features for Legora’s AI-native legal workspace. The role involves architecting web-platform functionality, owning code quality, security, and development speed, working across frontend and backend technologies, reviewing code, mentoring junior engineers, and driving continuous improvement. Engineers should demonstrate strong judgment, autonomy, pragmatic architecture, and the ability to understand unfamiliar codebases. Infrastructure and integration experience is advantageous.

Design and maintain scalable backend systems using Kotlin and Spring Boot. Lead architecture and technical design, develop secure REST APIs, improve engineering quality through testing and automation, and guide delivery across multiple initiatives. Mentor engineers, collaborate with clients and cross-functional teams, evaluate emerging technologies and AI capabilities, and promote resilient, maintainable software practices.

Lead design, development and maintenance of scalable, secure international pricing platforms and integrations. Provide technical leadership, conduct code reviews, champion DevSecOps and automated testing, mentor engineers, and drive observability, incident management and operational excellence across cloud-native systems.

Lead the design, implementation, and delivery of software components supporting machine learning inference on PlayStation consoles. Provide hands-on technical leadership for GPU inference systems, define architectures and project scope, establish technology strategies, and collaborate with global internal teams, hardware and software stakeholders, external vendors, and game developers.

Design, build, and optimize scalable software platforms supporting quantitative research and financial trading. Responsibilities include developing trading systems, modeling and simulation frameworks, research tools, machine-learning infrastructure, and high-performance distributed systems. The role involves collaborating with quantitative researchers, owning solutions end to end, applying strong software fundamentals, improving scalability and performance, and evaluating emerging technologies.

Leads systems engineering for autonomous defense systems, translating mission and customer needs into requirements, architectures, interfaces, and verification strategies. Collaborates across autonomy, software, avionics, hardware, and testing teams; develops C++ and Python tools and prototypes; investigates system behavior using simulation, logs, telemetry, and engineering data; and supports integration across software-in-the-loop, hardware-in-the-loop, ground, and flight testing.

Provide technical leadership for Cloudflare’s deployment platform, defining architecture and multi-quarter direction for safe, automated, health-mediated releases at massive scale. Lead RFCs, design reviews, incident retrospectives, technical migrations, and cross-team platform initiatives. Mentor engineers, influence teams without direct authority, develop observability and rollback guardrails, and shape AI integration in a safety-critical deployment system. The role requires autonomy, strong communication, and occasional on-call support.

The Senior Backend Software Engineer will design, develop, and maintain scalable backend services, optimize applications, build APIs, and collaborate across teams to improve user workflows and product efficiency.

The Senior Backend Software Engineer collaborates in teams to design and build scalable infrastructure systems, optimizing data-driven applications across sectors.

Work onsite with NATO customers to design and implement data-driven software solutions. Own end-to-end projects: architect systems, wrangle large-scale data, build web apps, collaborate with technical and non-technical stakeholders, and iterate rapidly in high-stakes environments.

The Senior Front End Software Engineer will architect and develop user interfaces for data-intensive applications, mentor peers, and engage directly with users to improve product features.

As a Software Engineer on the Apollo platform, you'll build and maintain systems for software deployment, solve customer issues, debug complex problems, and collaborate across teams.