Top Software Engineer Jobs in London

The Software Engineer will design and maintain backend APIs, enhance performance, collaborate on B2B solutions, and align architecture with product strategy.

The Senior iOS Engineer will lead product decisions, enhance the iOS app, maintain app architecture, and ensure excellent user experiences.

The Software Engineer will manage data collection for model training, operate cloud infrastructure, and collaborate on data management strategy to enhance Speechify's AI capabilities.

Hybrid Software Developer in Test (SDET) to build a new digital bank. Develop object-oriented code with Kotlin/Java/JavaScript, design for testability, implement automated tests (Cucumber/Capybara/Selenium), integrate CI (Jenkins/TeamCity), review designs, analyze code, assess risk, and use Jira for tracking.

Design, write and maintain automated Selenium web test suites, create test plans, improve CI pipelines, oversee deployments and releases, and mentor junior SDET engineers.

As a Junior Backend Software Engineer, you will design and implement scalable backend services, collaborate on features, and optimize performance while gaining mentorship and experience in a supportive environment.

As an AI/ML Software Engineer, you'll develop systems that transform audio and video data into structured insights, focusing on prompt engineering, agent systems, and model optimization.

As a Full-Stack Engineer at Electric Twin, you will build and evolve complex systems and user interfaces, emphasizing thoughtful engineering across the full stack, from front to backend.

The role involves developing digital solutions, leading teams in Agile and DevOps environments, and mentoring while ensuring high-quality Java-based systems development and testing.

Join cross-functional teams to develop low-level software for novel SoC platforms: write/debug Linux kernel drivers (Rust), optimize instruction-level compute kernels on RISC-V/ISA, build firmware for bare-metal/RTOS/embedded Linux, extend QEMU simulators, and perform hardware-software bring-up and low-level debugging from simulation to silicon.

As a Backend Engineer, you will build and maintain backend services, write maintainable code, review peers' work, and learn from experienced engineers while leveraging AI tools.

Build and maintain production web applications, improve code structure and architecture, ensure operational readiness and observability, lead and own larger projects, review code, collaborate across teams, participate in hiring and mentor colleagues. Work with relational and NoSQL data stores and scale systems solving logistical problems in a high-throughput marketplace.

Develop and optimize large-scale compute systems for AI workloads, improving infrastructure reliability and performance across various layers of the stack.

Join a cross-functional team to perform manual and exploratory testing, create/execute test plans, build and maintain automated tests for iOS and Android, validate API integrations, support regression and release activities, and improve testing practices and tooling to ensure accessibility, usability, and performance of mobile applications.

Design and build internal systems and tools across the firm, including infrastructure, monitoring, and tooling used by trading, research, and support teams. Collaborate with engineers, contribute to open source projects, and solve practical problems using strong programming and problem-solving skills.

Build and maintain the control planes, automation, and observability for a global fleet of machines. Develop production-quality Go services for provisioning, health checks, upgrades, and incident remediation. Architect high-throughput, low-latency networking, improve utilization and power-to-performance, and collaborate with product and platform teams on storage-aware scheduling and developer-facing features.

Build and maintain full-stack web applications using React/Next and Node.js; develop APIs, CI/CD, IaC and cloud-native solutions; support production, observability, automated testing and Agile delivery; collaborate with product, UX, marketing and stakeholders and apply AI-assisted development practices.

Work with the In Life squad to maintain and improve backend services (Node.js/TypeScript, Ruby/Rails), frontend apps (Nuxt), and infrastructure (AWS CDK, serverless). Troubleshoot bugs, follow engineering best practices, learn Salesforce, use AI in solutions, and collaborate with senior engineers to deliver customer-facing features.

Build and optimize backend microservices, APIs, and data models for a global payments platform. Collaborate with client teams, lead architecture for high-concurrency low-latency systems, and ensure testing, monitoring, deployment, and secure data handling for scalable financial products.

Lead frontend development of immersive websites and WebGL experiences, owning SDLC from ideation to delivery. Collaborate with creatives, mentor engineers, build responsive mobile-first UIs, drive R&D in immersive web and AI, and deliver projects for major entertainment clients.

Build and maintain DeepL's identity stack (organization, accounts, SSO/OIDC, SCIM, sessions). Own end-to-end feature delivery, write production-ready tests, participate in incident response, collaborate across teams, and improve authentication and authorization for enterprise-scale SaaS.

Design, develop, test and implement resilient UI and full-stack software across the system lifecycle. Build modern responsive React interfaces and mobile apps (iOS/Android), create Java Spring Boot microservices and event-driven integrations (Kafka, IBM MQ), apply Agile, TDD, automated testing and DevOps practices, and collaborate with architects, UX designers, product owners and stakeholders.

Design, build, and maintain backend API and database services for a cloud PBX platform. Drive architecture, performance optimization, debugging, CI/CD and test automation, and collaborate with QA. Mentor peers and raise engineering standards while safely evolving high-load, networked systems.

Develop and maintain the backend ecosystem for the Alta Video Management System, focusing on cloud-based distributed systems and coding quality.

The Software Engineer will develop the backend for a cloud-based video management system, focusing on system design, feature development, and enhancing existing capabilities.