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Senior Software Engineer United Kingdom Jobs

184 Job Offers

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Senior Software Engineer C#/.Net
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United Kingdom , Nottingham
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45000.00 GBP / Year
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Microlise
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MOD DV Cleared Senior Software Engineer
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MOD DV Cleared Senior Software Engineer sought for a 6-month contract in Portsmouth (hybrid, 3 days onsite). You will lead legacy modernisation and complex system evolution using Python and C/C++. Requires strong debugging, refactoring, and root cause analysis skills. Earn £750-£800/day (Inside I...
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United Kingdom , Portsmouth
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750.00 - 800.00 GBP / Day
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DataCareers
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Senior Software Engineer - Payments
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United Kingdom , Greater London
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80000.00 - 100000.00 GBP / Year
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Harrington Starr
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Senior Software Engineer, AI
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United Kingdom , London
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60000.00 - 70000.00 GBP / Year
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Randstad
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Senior Software Engineer
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Senior Software Engineer sought to design and build a distributed control plane for Confluent Cloud, a real-time data streaming platform. You will leverage deep expertise in distributed systems, Kubernetes, and Docker, using Go, C++, Java, or Python. This remote-first UK role offers a DevOps-driv...
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United Kingdom
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84500.00 - 99300.00 GBP / Year
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Confluent
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Senior Simulation Software & Security Engineer
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United Kingdom , Crawley
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Not provided
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Boeing
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Senior Software Engineer
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United Kingdom , London
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74700.00 - 122600.00 GBP / Year
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Microsoft Corporation
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Senior Python Software Engineer
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United Kingdom , Bristol
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70000.00 - 80000.00 GBP / Year
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Zenovo
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Senior Software Engineer, Ad Auctions
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Senior Software Engineer, Ad Auctions – Manchester, UK. Lead the design of real-time, large-scale distributed systems optimizing yield and revenue for Roku’s CTV platform. Requires 5+ years in cloud-based microservices (Java, Docker, Kubernetes) and deep experience with AWS/GCP. Drive auction log...
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United Kingdom , Manchester
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Not provided
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Roku
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FX STIRT Technology - Senior Software Engineer (SVP)
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Senior Vice President, Senior Software Engineer (SVP) sought for a London-based STIRT Technology leadership role. This hands-on position demands deep expertise in capital markets, low-latency systems, and FX/Rates derivatives. You will drive strategic architecture, manage a global team, and partn...
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United Kingdom , London
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Citi
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Senior Software Engineer
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Senior Software Engineer sought by a fast-growing fintech in London to build scalable, secure systems processing high-volume financial data. You need 5+ years’ experience, strong Python and advanced SQL skills, plus Linux expertise. This role involves designing backend applications, optimising da...
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United Kingdom , London
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80000.00 - 130000.00 GBP / Year
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Signify Technology
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Senior Software Engineer
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Senior Software Engineer sought by Barclays in Glasgow to design and build scalable digital services. You will leverage front-end expertise (React, Angular, TypeScript) and back-end skills (Java, Spring Boot, REST APIs) to drive innovation. Experience with microservices, event-driven architecture...
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United Kingdom , Glasgow
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Barclays
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Senior Software Engineer (DevOps)
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Senior Software Engineer (DevOps) sought for a customer-facing role in London, UK. You will design, build, and operate secure, cloud-native, AI-enabled solutions with a strong automation-first mindset. Key requirements include expertise in CI/CD, Infrastructure as Code (Terraform, Ansible), and C...
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United Kingdom , London
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Sabio Group
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Senior Software Engineer
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United Kingdom , London
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90000.00 - 100000.00 GBP / Year
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Data Idols
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Senior Software Engineer
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Senior Software Engineer sought by Optimizely, a MarTech leader powering digital experiences for H&M, PayPal, and Zoom. You will design scalable, cloud-based solutions using C#, .NET, and React, owning end-to-end delivery and operational excellence. Based in London, this role demands 8+ years of ...
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United Kingdom , London
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Optimizely
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Senior Software Engineer
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Rapid7 seeks a Senior Software Engineer for its Belfast Labs team to build world-class security data platforms. You will develop critical capabilities like vulnerability intelligence and Project Sonar using Python, Go, or Java. The role requires expertise in Kubernetes, Terraform, and AWS service...
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United Kingdom , Belfast
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Rapid7
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Senior Software Engineer
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Senior Software Engineer sought to join a high-performing Betting division team in London, UK. You will architect and build highly distributed, real-time systems for industry-leading Sportsbook and Risk Management products. Requires expert-level OOP skills (C#, Java, Python), strong software arch...
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United Kingdom , London
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Genius Sports
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Senior Software Engineer - Margin Technology - Assistant Vice President
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Senior Software Engineer (AVP) sought for Margin Technology in London. Join a global team building high-quality solutions using Java, React, and Python. You will develop RESTful APIs with Spring, apply TDD, and work on complex business problems in a fast-paced environment. Benefits include 27 day...
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United Kingdom , London
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Citi
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Senior Software Engineer
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Senior Software Engineer sought by a fast-scaling London fintech transforming FX and treasury operations. You will build high-impact, cloud-native trading systems using C#/.NET, SQL, and microservices. Ideal for engineers with 5+ years’ experience in financial technology. Join a collaborative tea...
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United Kingdom , London
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80000.00 - 100000.00 GBP / Year
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Harrington Starr
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Senior Software Engineer
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Senior Software Engineer sought by Optimizely to build scalable CMS features and cloud-based systems in London. Requires 8+ years’ experience with C#, .NET, and React, plus strong software design fundamentals. Join a leader in MarTech, working cross-functionally on AI-powered solutions for global...
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United Kingdom , London
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Optimizely
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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.