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Senior Software Engineer United Kingdom, London Jobs (Hybrid work)

59 Job Offers

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Senior Software Engineer Lead
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UnlikelyAI
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Senior Software Engineer
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ASOS seeks a Senior Software Engineer in London to build production-grade platform tooling. Requires deep TypeScript/JavaScript or backend expertise (C#/.NET, Node.js, Go) and Backstage experience. Enjoy hybrid work, discounts, and private medical care.
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ASOS
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Senior Software Engineer
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ASOS seeks a Senior Software Engineer in London to build production-grade platform tooling. Requires deep TypeScript/JavaScript or backend expertise (C#/.NET, Node.js, Go) and Backstage experience. Enjoy hybrid work, private medical care, and great benefits.
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ASOS
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Senior Software Engineer (Quality Engineering)
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Senior Software Engineer (Quality Engineering) in London to build scalable backend platforms, CI/CD, Kubernetes and AI-driven test automation. Join Thought Machine to modernise banking technology.
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Thought Machine
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Senior Software Engineer (Safety)
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Lead AI safety engineering in London, designing scalable ML systems and secure LLM applications. Mentor teams, drive technical strategy, and deploy production-grade solutions with Python, cloud, and Kubernetes expertise.
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Faculty
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Senior Software Engineer (AI/Data)
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Codat seeks a Senior Software Engineer in London to build its Advisory Intelligence Platform, designing semantic, signal and reasoning layers that power AI-driven banking insights. Requires strong C#, Python and production data systems experience.
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Codat
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Senior Platform Software Engineer I
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Join Braze as a Senior Platform Software Engineer in London, running Valkey, Memcached and Elasticsearch at massive scale on Kubernetes. Build automation and observability tooling with Go, Python or Ruby.
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Braze
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Senior Software Engineer - Credit
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LemFi seeks a Senior Software Engineer in London to build high-reliability Go backend services powering credit products for underserved communities. Requires fintech and credit domain experience, distributed systems expertise, and a strong correctness mindset.
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LemFi
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Senior Software Engineer - Discover & Book
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Senior Software Engineer role in London to build fast, accessible, responsive web experiences using modern frontend tech. Shape customer journeys, evolve design systems and improve Core Web Vitals.
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loveholidays
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Senior Software Engineer
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Quantexa seeks a Senior Software Engineer in London with commercial Scala and functional programming experience. Design and deliver high-quality solutions to complex problems using big data tech like Spark. Join a diverse, innovative team.
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Quantexa
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Senior Software Engineer
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Join Gigaton as a Senior Software Engineer in London and build AI-driven systems cutting carbon emissions in heavy industry. Work with Python, Terraform and AWS to optimise industrial plants.
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Gigaton
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Senior Software Engineer | Platform
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ARQ seeks a hands-on Senior Software Engineer for its Platform team in London. Build secure, highly-available infrastructure using Kubernetes, IaC, and typed languages like TypeScript or Go. Competitive salary, stock options, hybrid work.
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ARQ
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Senior Software Engineer (Java)
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Senior Java Backend Engineer role in London at ARQ, a fast-growing fintech. Build scalable microservices with Java 25, Spring Boot and Postgres. Requires strong Java skills and complex product experience. Competitive salary, stock options, hybrid office.
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ARQ
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Senior Software Engineer (Backend, Python)
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United Kingdom, London (GB)
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Octopus Energy
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Senior Software Engineer (Python)
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United Kingdom, London (GB)
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Octopus Energy
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Senior Systems Engineer - Autonomy & Software
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Shield AI
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Senior Software Engineer - AI Solutions
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United Kingdom, London (GB)
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Octopus Energy
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Senior Software Engineer - TV Playback (C++)
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Spotify
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Senior Software Engineer - Robotic Process Automation
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Heidi
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Senior Software Engineer, New Products
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Airwallex
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About the Senior Software Engineer role

Senior Software Engineer jobs represent a pivotal career stage where technical expertise converges with leadership and strategic influence. These professionals are the cornerstone of software development teams, responsible for designing, building, and maintaining complex, scalable systems that power modern businesses. Moving beyond foundational coding tasks, senior engineers architect solutions, make critical technology decisions, and mentor others, ensuring both product excellence and team growth.

Typically, individuals in these roles undertake a broad spectrum of responsibilities. They are deeply involved in the full software development lifecycle, from requirement analysis and system design to implementation, testing, deployment, and ongoing optimization. A core duty is architectural design, where they choose appropriate technologies, design patterns, and frameworks to create robust, secure, and scalable applications. This often involves building backend services, APIs (RESTful or GraphQL), and dynamic frontend interfaces. They ensure code quality through rigorous practices like code reviews, writing comprehensive tests (unit, integration), and establishing CI/CD pipelines. Furthermore, senior software engineers frequently collaborate with cross-functional partners, including product managers, designers, and DevOps specialists, to translate business needs into technical specifications and seamless user experiences.

The skill set for these jobs is both deep and wide. Proficiency in one or more core programming languages (such as Python, Java, JavaScript/TypeScript, C#, or Go) is essential, alongside expertise in relevant frameworks and libraries for both frontend (e.g., React, Angular) and backend development. A strong grasp of data structures, algorithms, and system design principles is mandatory. Experience with cloud platforms (AWS, Azure, GCP) and their services for computing, storage, and networking is increasingly standard. Knowledge of database technologies, encompassing both SQL (PostgreSQL, MySQL) and NoSQL (MongoDB, DynamoDB) systems, is crucial. Beyond technical acumen, senior roles demand excellent problem-solving abilities to debug complex issues and optimize performance. Soft skills are equally important; effective communication to articulate technical concepts to non-technical stakeholders, project leadership, and the ability to mentor junior developers are key differentiators.

Common requirements for Senior Software Engineer jobs usually include a bachelor’s degree in computer science or a related field, although substantial equivalent experience is often acceptable. Most positions seek candidates with 5+ years of professional software development experience, demonstrating a proven track record of shipping and maintaining production systems. Employers look for individuals who exhibit end-to-end ownership of projects, a passion for continuous learning in a rapidly evolving field, and a strategic mindset focused on long-term maintainability and business impact. For those seeking to lead through technology and drive meaningful innovation, senior software engineer jobs offer a challenging and rewarding career path at the heart of the digital world.