Top Software Engineer Jobs in London

Design and implement Arene SDK components and hardware-agnostic abstraction layers using modern C++ for embedded, resource-constrained automotive systems; collaborate with global teams to improve emulation, testing, and software delivery.

London-based software developer internship at Squarepoint building production software for algorithmic trading. Work on projects across Data Engineering, Risk, Market Data, Quant Development, and Frontend. Implement independent programming projects (Python or C++), use Unix systems, and collaborate with mentors to deliver solutions used in live trading. Minimum 12-week placement with networking and social events.

Design, build and deploy production-grade machine learning systems and infrastructure. Create reusable, scalable ML solutions, guide architecture and technical scoping, collaborate with cross-functional teams, and advise clients on ML feasibility, security, and best practices.

Develop and maintain full-stack applications for online booking journeys using TypeScript, React, C# and .NET Core. Collaborate with cross-functional teams to design, deliver, test, and operate scalable, reliable services on Azure. Participate in code reviews, troubleshooting, CI/CD, and continuous improvement to enhance performance and customer experience.

Design, develop, and maintain scalable backend systems and microservices (payments, treasury, transactions, crypto liquidity). Build REST APIs, improve existing systems, and apply clean code practices with TDD, DDD, and CI/CD.

Software Engineers at Citadel develop, maintain, and support high-performance trading platforms, focusing on custom software solutions and system stability.

Lead design and development of highly available, scalable Java/Spring Boot microservices for Wise's partner payment platform. Architect event-driven systems with Kafka, optimise PostgreSQL schemas, apply domain-driven design, influence cross-team architecture, mentor engineers, and collaborate with product and business teams to support bank partner integrations and global payments reliability.

Build and improve a cloud-native platform for enterprise AI agent visibility and governance. Work closely with customers and teammates, ship daily, refactor systems, contribute to technical direction, and participate in on-call support.

As a Software Engineer in the AI Platform team, you'll architect infrastructure for AI, maintain deployment and MLOps tools, and support diverse client environments.

Build and ship full‑stack features for North, an enterprise AI workspace. Develop secure autonomous agents, execution engines, integrations, observability and evaluation systems. Collaborate with researchers to productionize models and deliver performant, low‑resource deployment code while adhering to strict security and privacy constraints.

As a Senior Backend Software Engineer, you will develop and maintain the SaaS platform, focusing on user-centric design and implementation using a variety of technologies. Your role involves collaborating with teams to meet customer needs and enhance the product.

You will build distributed systems, derive algorithms for session detection, and integrate Meticulous into code generation to enhance developer feedback and efficiency.

As a Software Engineer at SolveAI, you'll develop backend systems for a key product, while having the freedom to influence the company's direction and work environment.

Interns will work on AI, code understanding, and data analytics, focusing on distributed systems and AI agents while collaborating with experienced engineers.

Senior Backend Software Engineer to own and evolve Depop's core backend systems. Improve scalability, reliability, observability and operational safety; design and implement backend services; collaborate across engineering, product, security and data; support production incidents; influence architecture; mentor colleagues; and drive platform capabilities used by many users.

As a Software Engineer Intern, you will develop data applications, refactor code, automate workflows on AWS, and collaborate with teams to enhance functionality.

Lead and deliver full‑stack features for international direct‑to‑consumer products. Collaborate with product, design, and analytics; own operations, metrics, on‑call, code quality, and talent development while driving technical design and execution.

Design and build complex, business-critical data pipelines and ML/LLM-powered clinical extraction systems. Collaborate with clinicians, product, and global engineering teams to scale solutions, maintain quality and security, and help grow the European engineering organization while developing UK healthcare domain knowledge.

Build and scale Wise's price comparison platform: develop scrapers, ingestion and validation pipelines, event-driven backend APIs, and monitoring to ensure accurate, trustworthy competitive-pricing data. Collaborate with product, analytics and engineering teams, own end-to-end delivery, and improve reliability and observability.

Lead backend development for Business Pricing: design and implement pricing plans, collaborate with product, data and design teams, deliver testable, maintainable services using JVM technologies, own features end-to-end, and drive product-focused, data-informed improvements to customer experience.

Design, build, and maintain high-quality software while collaborating with teams and utilizing AI agents to enhance development processes.

Build and own end-to-end systems powering autonomous AI sales workflows: high-throughput AI inbound SDR systems, dialer infrastructure, prospecting engines, post-interaction intelligence, and large-scale data pipelines using a modern TypeScript/React/Next.js and AWS-based stack.

Build and maintain backend platform services for multi-cloud compute and inference, implementing orchestration, resource scheduling, deployment pipelines, autoscaling, APIs, and event-driven systems. Design schemas and service APIs, work with messaging, storage, and databases, ensure quality via testing and observability, participate in design reviews, debug production issues, and document operational runbooks.

Design, develop and optimize trading systems and market-making algorithms; analyze complex datasets to inform stakeholders; build scalable, reliable client-facing products; implement controls and monitoring; serve as L3 SME during market stress and production incidents.

Design and build GitLab Duo CLI features in TypeScript, shape AI-assisted developer experiences, improve CLI reliability, observability, and performance, collaborate across Developer Clients, and provide technical leadership and mentorship.