Top Software Engineer Jobs in London

The Principal Software Engineer will lead client engagements, mentor teams, and ensure technical decisions align with business objectives, focusing on software craftsmanship and modernization.

As a Staff Software Engineer at The Trade Desk, you will design, build, and deliver data-focused products, contribute to solution design, and mentor other engineers. You will work on large-scale distributed systems and collaborate in a diverse team environment to solve complex problems.

The Senior Software Engineer will design and maintain backend services, enhance CI/CD systems, and develop scalable AWS infrastructure, while contributing to architectural decisions and ensuring system security and observability.

As a Senior Machine Learning Engineer, you will design, develop, and optimize ML solutions for enterprise customers, focusing on generative AI for improved content management. Collaborate with teams to ensure high-quality outputs and lead ML education efforts.

Lead architecture and hands-on delivery of a greenfield desktop trading platform. Design high-performance, latency-sensitive, event-driven systems, ensure crash containment and least-privilege boundaries, integrate desktop/web UIs, apply AI-assisted development discipline, mentor engineers, work through governance, and coordinate across trading, compliance, infrastructure and offshore partners to deliver production solutions.

Design, develop, and maintain high-performance, latency-sensitive back-end systems and APIs for trading. Lead architecture, own delivery lifecycle, mentor engineers, drive POCs and improvements, collaborate with traders/quants, and implement observability, CI/CD, and cloud-native patterns.

Work directly with clients to scope, prototype, and deploy AI-powered workflows. Build scalable systems using LLMs, embedding and retrieval systems, and backend infrastructure. Translate messy data and operational constraints into production-ready solutions, iterate with stakeholders, and maintain deployed systems (including on-call support).

Build and ship compliant, well-tested frontend software for patient and clinician workflows. Own end-to-end delivery, improve reliability, drive frontend performance and accessibility, collaborate with product/design/clinical teams, and apply GraphQL and modern tooling to deliver clinical-grade UIs.

Design, build, and operate Order Management platform features across checkout, fulfilment, returns, amendments and cancellations. Own end-to-end delivery including design, development, CI/CD, monitoring, production support, and platform architecture improvements to ensure scalable, resilient integrations and observable systems supporting retail fulfilment.

Design, build, and evolve order management capabilities across checkout, fulfilment, returns, amendments, and cancellations. Own features end-to-end from design through production support, improve platform architecture, integrations, reliability, and observability. Champion engineering excellence, CI/CD, monitoring, and operational excellence while mentoring engineers and collaborating with product and fulfilment stakeholders to deliver scalable, resilient systems.

Build scalable, distributed backend services and event-driven systems for AI-driven digital twins. Develop high-throughput, low-latency APIs and microservices in Node.js/TypeScript or Python, orchestrate AI agent systems, and collaborate with product and data science teams while mentoring engineers and shaping technical direction.

Design, build, and operate scalable Order Management capabilities for checkout, fulfilment, returns, amendments, and cancellations. Own end-to-end features, shape platform architecture, improve integrations and automation, and drive observability, resilience, and operational excellence in a high-volume retail environment.

Design, build, and own end-to-end order management capabilities for checkout, fulfilment, returns, amendments, and cancellations. Drive platform architecture, integrations, CI/CD, observability, resilience, and operational excellence. Mentor engineers, collaborate with product and fulfilment stakeholders, and continuously improve engineering standards and tooling.

The Software Engineer will focus on AI-native engineering practices, build innovative interfaces for software delivery, ensure system reliability, and have a strong backend expertise, particularly in Go, with a production mindset.

As a Software Engineer at Euphoric, you'll develop AI-driven features, collaborate across the tech stack, maintain quality code, and contribute to an innovative benefits platform.

Design, develop, and maintain components of the LNIP intelligence core platform, including a semantic search API and internal data curation tool. Implement secure coding standards, unit testing, code reviews, and cloud deployments. Use agentic development tools responsibly and work with complex data models, vector embeddings, SQL and PySpark to support intelligent software systems.

Design, build, test, deploy and operate backend services for the Contact Centre. Integrate CCaaS platforms (Zendesk, Twilio, Azure/GCP), design APIs and event-driven solutions, and deliver customer self-service/FAQ capabilities while collaborating with product, data, security and customer stakeholders.

Lead backend-focused engineering for Contact Centre platforms, designing and operating secure, scalable services and integrations (Zendesk, Twilio, Azure/Google). Provide technical direction, write production-quality Java code, define APIs and event-driven workflows, and collaborate with Product, Data, Security and Customer Service to deliver reliable customer and colleague experiences.

Lead backend engineering for Contact Centre technology, designing, building and operating secure, resilient services and integrations (Zendesk, Twilio, Azure, Google). Provide technical direction across teams, implement APIs, event-driven workflows, and responsible AI automation while staying hands-on with production-quality Java code.

Backend-focused senior engineer to design, build and operate Contact Centre services. Build APIs and event-driven integrations with CCaaS platforms (Zendesk, Twilio), develop self-service/FAQ solutions, and ensure CI/CD, testing and live operation.

Build end-to-end systems to capture voice, photos, and video and automatically finish reports; design architecture for unstructured data and AI integration; ensure seamless offline/online behavior; evolve the workflow builder; engage with users, ship features, and iterate on product impact.

Lead and deliver large-scale distributed infrastructure projects from ambiguous requirements to production. Make architecture decisions, ensure reliability, scalability, and security, collaborate with research/product teams, set technical standards, improve operational processes, and mentor engineers.

Lead application and cloud/container security across the SDLC: threat modeling, architecture reviews, security code reviews, DevSecOps automation, vulnerability management for Kubernetes/container images, incident response, detection engineering, and compliance with OWASP/NIST/ISO standards.

Design, build and operate a low-latency, high-throughput trading platform: integrate trading venues, optimise performance, ensure correctness and availability, own CI/CD, observability and platform architecture, and support historical data and research needs.

The role involves designing and delivering secure, scalable software, influencing technical direction, mentoring engineers, and solving complex customer problems.