Top Software Engineer Jobs in London

Lead and grow a Build Engineering team to design, operate, and improve BNY's central build automation and CI/CD platform. Drive architecture, reliability, observability, secure supply chain practices, developer-facing templates and tooling, cross-team partnerships, and adoption of emerging technologies to accelerate software delivery and measure platform success.

Lead development of embedded firmware and low-level software for security and detection products. Design, implement, and test embedded code, collaborate with hardware engineers, mentor junior engineers, and support product integration and validation.

Senior Embedded Software Engineer role at Smiths Detection contributing to development of embedded software for threat detection and security screening products. Work with R&D, manufacturing, and cross-functional teams on product development, testing, and lifecycle support within a global engineering organization.

Develop and refine Arene SDK components and hardware-agnostic abstraction layers using modern C++ for embedded, resource-constrained automotive systems. Collaborate with global teams to accelerate software delivery, ensuring safety, quality, and robust integration with vehicle systems.

Lead technical direction and modernisation of customer platform systems; design, build and operate mission-critical services; drive DevOps, observability, performance and security; mentor senior engineers; influence product and technology strategy; promote engineering excellence, automation, and open-source engagement.

Design, build, test, release and maintain scalable software and distributed systems. Provide technical leadership on complex projects, review code, influence architecture, optimise deployment pipelines and collaborate with stakeholders to deliver reliable solutions.

Lead technical direction for Customer Platform systems, design and deliver scalable cloud-native solutions, champion engineering best practices (clean code, DevOps, observability), mentor senior engineers, drive operational excellence, and influence product and technology strategy across multiple teams.

Design, build, release and maintain scalable software for distributed systems. Provide technical leadership, review code, contribute to architecture, optimise deployment pipelines, and collaborate with stakeholders to deliver high-impact solutions.

Design, develop, and maintain scalable backend systems for fintech products. Build REST APIs and microservices, improve existing systems (payments, treasury, transactions, crypto), and use Java, Spring Boot, and Postgres. Follow TDD, DDD, and CI/CD practices to deliver maintainable, high-performance services.

Design, develop, and maintain scalable, secure backend systems and microservices. Build REST APIs, improve existing systems (payments, treasury, transactions, crypto liquidity), and deliver high-quality code using Spring Boot, Java, Postgres, TDD, DDD, and CI/CD practices. Collaborate across teams in a hybrid office environment.

Design, build, and operate highly reliable, scalable CI infrastructure and test systems across multiple clouds. Develop intelligent test selection, merge queue management, incident automation, flake detection, and developer-facing tooling to improve developer productivity and CI reliability at scale.

Develop and maintain full-stack web applications using C#, .NET (including .NET 8), Blazor and Angular 15. Build APIs, integrate databases (MySQL, SQL Server, MongoDB), write tests, perform code reviews, optimize queries, document systems, and collaborate in Agile teams to deliver high-quality solutions.

Build, operate, and evolve the Midnight Indexer in Rust: ingest and process blockchain data, design schemas for PostgreSQL/SQLite, implement a high-performance GraphQL API with real-time subscriptions, ensure reliability through testing and observability, and collaborate across node, ledger, wallet, and security teams.

Lead design and implementation of the Libraries Platform: services, pipelines, package index, automation for builds, CVE remediation, SBOM/provenance, AI-assisted patching, and reliability/observability for multi-ecosystem package workflows.

Design, develop, and implement custom ServiceNow applications; gather requirements from stakeholders; customize and integrate ServiceNow with external systems; perform testing and ensure coding standards; document solutions and provide ongoing support; collaborate with admins and IT teams to deliver scalable ServiceNow solutions.

Design, build, and maintain automation and testing infrastructure for the North platform: CI/CD pipelines, GitHub workflows, containerized test environments (Docker/Kubernetes), Helm and ArgoCD deployments, infrastructure-as-code, benchmarking, parallel test execution, and cross-team standards to improve test coverage, reliability, and deployment confidence.

The software engineer will develop AI tools for sustainability reporting, collaborating on product strategy and ensuring code quality while leveraging LLMs.

Design, build, and own CI/build/test pipelines for a compiler/runtime/simulator stack; scale and parallelize large test suites, manage heterogeneous CI runner fleets and scarce hardware, implement perf-regression baselines and observability, and define hermetic, safe-by-default build and test standards to maximize developer velocity.

The Senior Software Engineer will design and maintain scalable systems, improve system performance, mentor engineers, and support on-call responsibilities.

Lead embedded and real-time C++ development for a regulated medical device: design hardware abstraction, device drivers, and data acquisition; define technical strategy; ensure IEC 62304-compliant software quality; collaborate with FPGA/electronics teams; mentor engineers; contribute to risk management and system integration in a safety-critical clinical environment.

Define and architect end-to-end verification and compliance-as-code for a medical device software stack. Build scalable test infrastructure across embedded and cloud systems, integrate safety and regulatory evidence into CI/CD, lead AI-augmented test strategies, mentor engineers on TDD and automated quality gates, and collaborate with Systems and Regulatory teams to ensure IEC 62304 and ISO 14971 compliance.

Responsible for designing and building backend services using Go on AWS, providing technical leadership, and improving engineering practices in a green field environment.

Build reusable tooling, prototypes, and paved-road patterns to enable AI-native and agentic engineering across R&D. Drive platform, security-aligned architecture, observability, and developer enablement while collaborating with architects and teams to remove friction and demonstrate production-viable AI patterns.

Lead end-to-end AI solutions as a forward-deployed engineer: scope, design, and deploy ML/LLM systems; partner with clients and stakeholders; build infrastructure, data pipelines, and reusable platform components; mentor engineers; own projects from discovery through production and provide on-call support.

Build and ship native Android features using Kotlin and Jetpack Compose. Design clean user flows for financial services, integrate backend APIs, improve performance and stability, use analytics and production feedback, and implement AI-assisted on-device experiences where beneficial.