Top Software Engineer Jobs in London

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.

Design and implement scalable IAM architecture and tooling for AuraDB. Integrate enterprise SSO providers, implement auth protocols (OAuth2, OIDC, SAML, LDAP, MFA), manage lifecycle (SCIM), develop access control models (RBAC/ABAC/PBAC/ReBAC/FGA), enforce least-privilege, apply zero-trust patterns, ensure SOC 2 compliance, mentor engineers, and collaborate across product, security, and infrastructure teams.

As a Senior Software Engineer II, you will drive the technical vision for backend solutions, enhance recipient management, and ensure system reliability.

The role involves designing and implementing Citi's algorithmic trading and Smart Order Routing platform, collaborating with trading desks, and optimizing trading strategies while maintaining high code quality.

Develop and maintain high-performance low-latency electronic trading systems; collaborate with teams to enhance execution features and ensure platform reliability.

The Senior Software Engineer will lead the development of backend systems for payment processing, collaborating with teams, setting goals, and fostering quality and ownership in code development.

As a Software Engineer, you will lead technical projects, improve code structure, and collaborate with teams to scale Deliveroo's systems. You will also participate in hiring and support team members' growth.

Software Engineers at Jane Street design and build systems using OCaml and Python, focused on functional programming for various teams.

Design and implement browser-based trading tools with polished, sophisticated UIs. Build reusable UI libraries and abstractions, collaborate across the stack, and work closely with traders to capture user needs. Emphasizes typed functional programming and high UX standards.

The Software Engineer will develop and ship backend solutions using Python and Django, ensuring high quality and reliability, while collaborating across teams to enhance system performance and design.

The Production Software Engineer ensures system resilience and operational efficiency, focusing on deployment automation, observability, and collaboration across engineering teams.

As a Software Engineer at Joinkult.ai, you will develop a real-time AI voice assistant for gamers, enhancing gameplay through innovative voice interaction and complex knowledge engine design.

As a Software Engineer at Crumb, you will build AI tools and a marketplace, owning the product from end-to-end, using React, Node.js, and TypeScript.

As a Software Engineer at Cryptio, you will develop high-performance backend services in Rust and optimize PostgreSQL database schemas for the fintech SaaS platform.

Join a startup to develop a low-latency video streaming and networking infrastructure for remote teleoperation of humanoid robots and autonomous vehicles.

The Software Engineer will build core software infrastructure for a decarbonised energy system, collaborate across the stack using Python and Docker, and optimize grid usage for energy devices.

As a Software Engineer, you will build AI-powered features using React and Python, collaborate with founders, and influence key decision infrastructure.

Design and scale backend systems for an AI-native fashion marketplace, integrating complex payment workflows and mentoring junior engineers.

The Software Engineer will design and implement solutions for FX and Cross-Border Payments, taking ownership of the delivery lifecycle and utilising modern technologies. Responsibilities include collaborating with stakeholders, leading deliveries, and improving systems with innovative solutions.

As a Full-Stack Software Engineer, you'll lead the technical strategy for AI applications in the public sector, architecting frameworks, guiding development, and mentoring staff.

As a Senior Full-Stack Software Engineer, you will develop AI applications for public sector clients, design full-stack solutions, and manage cloud infrastructure while collaborating with cross-functional teams to address complex challenges.

Lead the development of AI-driven solutions, architect scalable AI products, mentor junior engineers, and integrate AI across the organization.

Build and maintain large-scale data pipelines and distributed systems to ingest, process, store, and serve petabytes of vehicle data for ML and AD/ADAS development. Collaborate with ML and CV engineers, design cloud-native solutions, and ensure reliability, observability, and automation across data platforms.

Develop and maintain frontend software using TypeScript and modern frameworks. Implement state management, API integrations (REST, WebSockets), write tested maintainable code, follow CI/CD workflows, collaborate across teams, and apply engineering best practices and data-structure/design-pattern knowledge.

As a Software Engineer, you'll design and manage GPU/TPU infrastructure targeting AI/ML workloads, collaborating across teams to optimize performance and ensure reliability of machine learning systems.