Top Software Engineer Jobs in London

As a Senior Software Engineer at KoBold, you'll develop innovative data systems for mineral exploration, collaborating closely with geologists and data scientists to improve exploration success rates. You'll own projects end-to-end, engage with users, and create scalable, production-quality solutions for complex geological challenges.

As a Senior Software Engineer, you will build complex backend services and APIs using Node.js and TypeScript, contribute to design discussions, mentor junior engineers, and enhance service reliability and engineering quality.

Lead design, implementation, deployment, and operation of identity services (SSO, OIDC, SCIM, sessions). Mentor engineers, own reliability and performance, respond to incidents, set technical direction, and evolve the identity platform for scale and availability.

Build and operate metadata, semantic, lineage, and provenance capabilities within a cloud-native Data Platform. Translate analytical and ML workflows into versioned, discoverable, governed dataset products. Implement ingestion, APIs, automation, and tooling on AWS to improve discoverability, reproducibility, and reuse of scientific data. Collaborate with Computational Immunology, lab, and platform teams and own technical solutions from design through production and operations.

Lead design and development of core data storage, streaming, caching, and indexing platforms. Collaborate with cross-functional teams to deliver features, improve practices, mentor engineers, and present technical guidance to stakeholders while ensuring platform reliability and scalability.

Lead design and development of internal and customer-facing systems across underwriting, claims, finance, and compliance. Own backend services, APIs, and scalable infrastructure; drive architecture, deployment, reliability, and performance; automate workflows with product and operations partners; mentor engineers and set engineering best practices.

Build and architect Base360.ai: design and launch booking, pricing, payments, operations, and AI-powered automation. Integrate platforms (Airbnb, Stripe, Twilio, OpenAI), scale systems internationally, and embed AI workflows to automate operations and optimize revenue.

Build and enhance backend, event-driven payment services within a distributed systems platform. Contribute to microservices, streaming, and event-sourced architectures, participate in Agile Scrum teams, write well-tested code, support production reliability, and collaborate with product and engineering stakeholders while learning modern JVM-based development practices.

Design, implement, test, secure, and maintain backend services for commercial journeys. Collaborate with product and cross-functional engineering teams, embed testing and security standards, contribute to CI/CD pipelines, and participate in engineering communities and agile delivery practices.

Technical lead for a Golang backend: translate architecture into detailed designs, stay hands-on with AI-assisted implementation, build secure microservices and REST/gRPC APIs, drive containerization and secure CI/CD/DevSecOps, enforce security standards (OWASP, ISO 27001, IEC 62443), mentor engineers, own testing and operational reliability, and collaborate cross-functionally to protect OT/ICS environments.

Design, build, test, deploy, and support full-stack research technology solutions. Collaborate with business analysts, engineers, and QA to translate requirements, implement services and web/mobile clients, improve performance, enable observability and on-call support, and apply AI-driven techniques to optimize workflows.

Lead technical direction for Short Term Credit platform, design system and data architecture, mentor lead engineers, drive adoption of Generative AI, produce technical designs, troubleshoot issues hands-on, and influence stakeholders to deliver mission-critical fintech products.

Own and improve Langfuse SDKs (Python and TypeScript), ensuring reliability, performance, API design, integrations with AI frameworks, OpenTelemetry support, documentation, and developer experience.

Build and maintain product features that streamline property transactions. Use LLMs and AI coding agents to accelerate development, debug issues, and iterate rapidly. Own tasks from day one, collaborate with a small team, and apply practical problem-solving to deliver customer-facing improvements.

Design, build, and maintain large-scale distributed data systems and pipelines for blockchain analytics. Ship production code, drive technical direction, mentor engineers, improve reliability, observability, and cost efficiency, and collaborate with product, data science, and intelligence teams.

Design and build the developer-facing project, secrets, and observability platform connecting Magic Containers, Edge Scripting, and Bunny Database. Implement environment management, secrets APIs, unified logs/metrics, fine-grained API keys/permissions, and multi-tenant secure systems. Drive API design, testing, and architecture decisions across the Core API team.

Senior full-stack product engineer owning large product areas end-to-end: research, write specs, design wireframes, implement features across frontend and backend, and collaborate closely with product, design, and infra. Focus on solving customer problems, building durable abstractions, and shipping high-quality, scalable software.

Senior full‑stack product engineer owning a large product area end-to-end: research customers, write specs and wireframes, design and implement features across frontend and backend, collaborate with product and design, and ship high-quality scalable software.

Lead design, develop, test, deploy, and support enterprise Appian workflow and case-management applications. Build integrations (REST/SOAP), enforce engineering best practices, support CI/CD and production deployments, tune performance, collaborate with stakeholders, and incorporate risk controls.

Lead backend and systems engineering from design through production for connected, embedded, edge-computing healthcare products. Design distributed systems, write primarily Python, improve testability and reliability, mentor engineers, collaborate cross-functionally, and produce clear technical documentation.

Design, implement and maintain backend systems and services for the Horizon platform. Build cloud-native AWS HTTP APIs and event-driven microservices (gRPC) in Rust and Python, design data models for complex trades, work with MySQL, MongoDB and DynamoDB, collaborate with quants, front-end and platform engineers, engage with clients and stakeholders, and deliver performance-critical, observable, testable code.

Lead design, development, and maintenance of scalable software systems. Provide technical leadership across multiple teams, act as prime technical contact, collaborate with customers and partners, mentor engineers, and contribute to architecture, delivery planning, and DevOps practices.

Lead design, development, deployment and maintenance of critical software systems. Own team deliverables, collaborate with product, frontend and QA, mentor junior engineers, and work across the full SDLC with CI/CD, containerisation and cloud platforms to deliver scalable, high‑quality solutions in an agile environment.

Lead technical design, build, and operate backend systems powering high-traffic web and data platforms. Serve as a Staff-level technical authority, mentor peers, drive cross-team technical direction, and own operational health, reliability, and reporting pipelines. Transition into people management, directly managing engineers and participating in hiring and performance processes.

Lead the delivery of scalable software solutions to improve patient outcomes in primary care. Collaborate across teams to define requirements and drive impactful changes.