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Senior Software Engineer United Kingdom, London Jobs

85 Job Offers

Senior Software Engineer
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Senior C# Engineer sought by a leading systematic investment firm in London. This front office role offers £160k base plus bonus, focusing on building scalable backend systems and APIs. You will drive architectural decisions and collaborate with business stakeholders. Ideal for engineers with str...
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United Kingdom , London
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150000.00 - 160000.00 GBP / Year
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Orbis Consultants
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Senior Software Engineer
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Senior Software Engineer sought for a London-based role to build and scale backend services, owning features end-to-end from API design to data modeling. Ideal for a product-minded engineer comfortable with ambiguity and working across the stack. You’ll collaborate with product/design teams, enha...
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United Kingdom , London
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80000.00 - 95000.00 GBP / Year
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Orbis Consultants
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Senior Software Engineer
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Senior Software Engineer sought to shape the architecture and scalability of a cutting-edge AI-powered platform for global enterprise clients. You will own key components from design to deployment, leveraging Python, TypeScript, and AWS/GCP. This London-based role offers genuine influence over te...
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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, Web, Global Exchange Operator
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Senior Software Engineer sought by a global exchange operator to join their London-based web team. You will build and maintain high-traffic, mission-critical systems for European equities venues. Requires 5+ years of full-stack experience with Python, JavaScript, and Django. This role offers the ...
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United Kingdom , London
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96000.00 GBP / Year
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Signify Technology
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Senior Software Engineer
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Join Microsoft’s ISE team in London as a Senior Software Engineer. You’ll solve complex customer challenges by building cloud-based AI/ML solutions using C#, Python, or Java. We seek expertise in LLMs, RAG, and cloud AI platforms like Microsoft Foundry. This role offers hands-on collaboration, mo...
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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 Software Engineer - Payments
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Senior Software Engineer sought to design and scale critical payment infrastructure for a leading global fintech. You will build high-volume, multi-currency transaction systems using distributed systems and APIs. This role demands deep backend expertise in fintech or banking, with a focus on clea...
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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, CalcGraphs - Vice President
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Senior Software Engineer, CalcGraphs – Vice President at Citi in London. Design and build the next-generation distributed calculation engine for the XiP platform. Requires deep Java expertise, Spring/Spring Boot, RESTful APIs, and large-scale system experience. Lead strategic improvements, coach ...
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United Kingdom , London
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Citi
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Senior Embedded Software Engineer
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Senior Embedded Software Engineer sought by Pod, a leading UK EV charging provider, to design and deliver embedded software for IoT-connected hardware. You will own features end-to-end, integrate Thread, Matter, and Wi-Fi, and mentor junior engineers. Required experience in embedded systems and C...
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United Kingdom , London
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65000.00 - 75000.00 GBP / Year
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Pod Point
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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 (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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Not provided
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Sabio Group
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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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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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Senior Software Engineer (Digital Showroom)
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Senior Software Engineer (Digital Showroom) sought to own full-stack development in a large-scale serverless cloud environment using Node, React, Next, and GCP. You will architect microservices, champion test-driven quality, and mentor engineers while bridging communication with stakeholders. Enj...
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United Kingdom; France , London; Nantes; Paris
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Akeneo
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Senior Software Engineer
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Senior Software Engineer sought by Collinson, the global leader behind Priority Pass and loyalty solutions. You will design scalable, cloud-native applications using TypeScript (Node.js & React) in London. Requires 5+ years of full-stack experience, expertise in AWS, event-driven architectures, a...
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United Kingdom , London
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Collinson
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Senior Software Engineer – Identity & Authentication
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Senior Software Engineer – Identity & Authentication sought for Vanguard’s London team. This hands-on full-stack role involves building cloud-based MFA and authentication platforms using NestJS and React. You will design secure APIs and infrastructure in a regulated environment. Benefits include ...
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United Kingdom , London
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Vanguard
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Senior Frontend Software Engineer
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Senior Frontend Software Engineer sought by an elite London trading firm with an unlimited tech budget. You will build high-scale, low-latency solutions using C++ 20/23, optimizing ML pipelines processing millions of data points per second. Ideal candidates have 2-15 years of C++ experience, stro...
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United Kingdom , London
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Not provided
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Hunter Bond
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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.