Top Software Engineer Jobs in London

Seeking a Software Engineer to independently develop features for a high-traffic e-commerce platform, focusing on API design, database performance, and AI integration. Responsibilities include feature ownership, system improvements, and collaboration with stakeholders to enhance product development.

As a Senior Card Processing Software Engineer, you will design and scale card processing services, lead the in-house payment integration, and manage a growing team, ensuring high technical standards and collaboration across departments.

As a Software Engineer, you will develop solutions for a cutting-edge trading system, enhance a petabyte-scale data platform, and apply engineering best practices.

Lead the Research team in developing scalable machine learning solutions, mentoring junior engineers, optimizing model training, and collaborating on real-world engineering problems.

Develop machine learning models for real-world physics problems, optimize model performance, implement distributed training, and mentor less experienced colleagues.

The Applied AI Engineer will support customer adoption of AI products, integrate AI models into applications, and improve product capabilities based on feedback.

Build and scale international payments infrastructure: multi-currency accounting, reconciliation, and integrations with banking rails. Launch new markets and mature production systems while collaborating with compliance, product, ops, and partners to ensure reliability and regulatory alignment.

Build and scale a price-comparison platform: implement robust scrapers, data ingestion and validation pipelines, and reliable backend APIs. Ensure data quality and observability, operate distributed event-driven systems, collaborate with product and data teams, own end-to-end delivery, and drive technical excellence through testing and reviews.

Senior full-stack developer responsible for designing, building, testing and supporting secure, production-ready post-trade web platforms using C# .NET and Node.js, applying AI-assisted development practices while ensuring traceability, auditability and regulatory compliance.

Build and maintain APIs and systems for money movement, debug production issues, mentor engineers, and collaborate with stakeholders.

Build and operate backend and platform services for ACRA, a secure Kubernetes platform. Develop Go services, design scalable distributed systems, implement CI/CD/GitOps workflows, manage containers and secrets, improve observability and incident response, and own platform features for isolation, policy enforcement, and auditability.

The Software Engineer in Test Automation will design and maintain automated test frameworks, integrate tests in CI/CD pipelines, and ensure quality in mobile applications, collaborating across teams to improve testing practices and monitoring.

The Senior Software Engineer will develop and maintain Lua business logic for ad serving, ensuring performance and reliability while collaborating with product teams on feature delivery.

Lead design and implementation of scalable backend and frontend systems, own domains end-to-end, set technical strategy and architecture, mentor engineers, drive cross-team initiatives, and improve reliability, performance, testing, monitoring, and CI/CD for customer-facing microservices.

Develop software for Codex focusing on enterprise solutions, building APIs, integrating with identity systems, and collaborating with teams to ensure quality.

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.

The Software Engineer (iOS) will develop and maintain features of the Rightmove app, collaborate on product design, ensure code quality, and optimize user experience through analytics and testing.

The role involves enhancing systems for optimization in financial institutions, developing APIs, validating data, and automating processes within a collaborative engineering team.

As a software developer, you will enhance applications for Exchange-Traded Derivatives operations, ensuring accurate post-trade processing and compliance with regulatory standards. You'll design, develop, and support critical data-driven systems.

Design and develop high-performance backend systems for trading connectivity, integrating new liquidity providers, and ensuring platform reliability and security.

Responsible for developing and optimizing trading systems, collaborating with quants and traders, and driving innovative trading application projects.

Build and scale Base360.ai: design APIs, services, and cloud-native infrastructure; implement event-driven automations, AI-powered workflows, and integrations (Airbnb, Stripe, Twilio, OpenAI). Own projects end-to-end to automate operations, improve pricing and guest experiences, and enable global scaling.

Design, develop, and maintain scalable Java backend systems and microservices powering card payments, treasury management, transactions, and crypto liquidity. Build REST APIs, apply TDD and DDD, ensure maintainability, and deliver via CI/CD processes while collaborating with product and engineering teams.

Design, develop, and maintain scalable Java-based backend systems and microservices (payments, treasury, transactions, crypto). Build REST APIs, evolve existing systems, apply TDD/DDD, and support CI/CD for high-performance, secure fintech products.