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Senior Developer United Kingdom Jobs

107 Job Offers

Senior Python Developer
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Senior Python Developer needed in Belfast for Citi’s Wholesale Credit Risk Technology team. You will design innovative solutions using Python, FastAPI, and modern AI frameworks like LLMs and RAG. Requires 5+ years of enterprise development experience with CI/CD, Kubernetes, and strong collaborati...
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United Kingdom , Belfast
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Not provided
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Citi
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Senior Java Developer - Fixed Income Algo Technology
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Senior Java Developer role in London, focusing on Fixed Income Algo Technology. You will design low-latency, high-throughput trading components using Core Java, Kafka, and Chronicle. Collaborate directly with Traders and Quants to build robust back-testing frameworks and live trading systems. Ben...
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United Kingdom , London
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Citi
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Senior Integrations Developer - Microsoft / .NET
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Seeking a Senior Integrations Developer to design and maintain software systems using .NET 8, Azure, and SQL Server. You will develop web integrations and APIs, working with internal teams and third-party solutions. This UK-based role requires strong C# and Azure services expertise, with a focus ...
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United Kingdom
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50000.00 - 55000.00 GBP / Year
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360 Resourcing Solutions
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Senior Optimizely Developer
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Seeking a Senior Optimizely Developer in London to lead complex development streams for enterprise clients. You'll need 4+ years in .NET and 2+ years with Optimizely CMS, plus cloud and CI/CD expertise. Take ownership, mentor developers, and deliver high-quality, scalable solutions autonomously.
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United Kingdom , London
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360 Resourcing Solutions
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Senior AI Developer
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Join WorkNest Secure in Leeds as a Senior AI Developer. Build and deploy production AI/ML models using Python, TensorFlow/PyTorch for cybersecurity threat detection. A hybrid role requiring cloud (AWS/Azure) and MLOps experience. Enjoy flexible working while pioneering proactive defence solutions.
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United Kingdom , Leeds
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WorkNest
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Senior GenAI Developer - Innovation Labs
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Lead the design and development of cutting-edge AI services at Citi Innovation Labs in London. This senior role requires deep expertise in Python, AI/ML, and cloud architectures to deliver complex, production-ready solutions. You will drive innovative projects, guiding technology vision and engag...
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United Kingdom , London
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Citi
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Senior Front-End Developer
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Join Citi Tech in London to engineer the future of global finance. As a Senior Front-End Developer, you'll build a greenfield FX Options Trading Platform using React and TypeScript. Collaborate with global teams on real-time data applications and champion modern CI/CD practices. Enjoy a competiti...
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United Kingdom , London
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Citi
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Senior Python Backend Software Developer
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Join Xelix, a fast-growing AI scale-up, as a Senior Python Backend Developer. You will build robust, scalable solutions using Python, Django/Flask, and AWS in our London office (hybrid). We offer private medical cover, enhanced leave, and a dynamic environment focused on impact and growth.
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United Kingdom , London
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70000.00 - 95000.00 GBP / Year
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Xelix
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Senior Salesforce Developer
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Join our team in Abingdon as a Senior Salesforce Developer. Leverage your deep expertise in Salesforce Industries, including OmniStudio, Vlocity CPQ, and EPC. You will drive development, set engineering standards, and mentor the team. Telecom or broadband industry experience is a major advantage.
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United Kingdom , Abingdon
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360 Resourcing Solutions
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Senior Power Platform Developer / Consultant
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Shape automation strategy as a Senior Power Platform Developer in Essex. Lead RPA solutions with Power Automate and Power Apps, while establishing a Centre of Excellence. This consultative role blends hands-on development with stakeholder engagement in the public sector. Drive governance and inte...
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United Kingdom , Essex
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Morson Talent
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Fixed Income eTrading Connectivity – Senior Developer
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Join Citi in London as a Senior Developer for Fixed Income eTrading Connectivity. Design and develop high-performance, low-latency front-office applications using C++ and Core Java. This role offers a chance to transform the connectivity landscape with a competitive package including bonus, priva...
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United Kingdom , London
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Citi
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AI Solution Developer II / Senior AI Solution Developer
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Join our Scientific Data Technology and AI team as an AI Solution Developer. You will design and deploy cutting-edge ML and GenAI models using Palantir Foundry to solve complex life sciences challenges. We seek a developer with strong machine learning fundamentals and hands-on Foundry experience....
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United Kingdom
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Parexel
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Senior Front-End Developer – Equity Derivatives Technology
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Lead the development of a global pre-trade RFQ and pricing platform as a Senior Front-End Developer in London. This VP role requires strong React expertise and experience with financial systems, ideally in Equity Derivatives. You will act as a technical lead, collaborating closely with trading de...
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United Kingdom , London
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Citi
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Senior Salesforce Developer
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Join our dynamic EdTech company as a Senior Salesforce Developer in the West Midlands. You will leverage your 4-6 years of CRM experience and expertise in Apex, Visualforce, and integrations to shape our platform's future. Drive enhancements, optimize workflows, and ensure seamless data quality i...
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United Kingdom , West Midlands
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60000.00 - 65000.00 GBP / Year
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Broster Buchanan
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Front Office Senior Java Developer
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Join Barclays in Glasgow as a Senior Java Developer, embedded within the Front Office. You will build scalable Java/Spring Boot solutions for the global EFG Funding Desk, directly supporting critical T+1 settlement transitions. This role requires strong collaboration with business users and offer...
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United Kingdom , Glasgow
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Barclays
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Senior Developer
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Join Fourth's HRUK team in London as a Senior Developer. Leverage your 5+ years with C#, .NET, SQL, and React to build REST APIs and modernize legacy systems. Enjoy a hybrid model, 25+ days holiday, healthcare, and pension while mentoring juniors in an Agile environment.
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United Kingdom , London
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HotSchedules Corporate
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FX Technology – Cross Border Payments, Senior Developer
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Join Citi's FX Technology team in London as a Senior Developer. You will design and build low-latency cross-border payment and trading systems, replacing legacy platforms. This hands-on role requires deep FX knowledge and collaboration with trading teams. We offer a competitive bonus, private med...
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United Kingdom , London
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Citi
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Senior Developer
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Join our agile team in Stockport as a Senior .NET Developer. You will build modern .NET Core applications, shape service-driven architecture, and deploy to Azure. Mentor the team, drive technical improvements, and enjoy benefits like 33 days holiday and a wellbeing package.
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United Kingdom , Stockport
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AO
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Senior .Net Software Developer
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Join a leading FinTech in Birmingham as a Senior .Net Developer. Work on greenfield or brownfield projects using C#, .NET, and Azure cloud services. You will build secure APIs, apply SOLID principles, and collaborate in an Agile environment. Enjoy benefits like 25 days leave, life assurance, and ...
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United Kingdom , Birmingham
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50000.00 - 65000.00 GBP / Year
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Hunter Selection | B Corp™
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Senior Full Stack Salesforce Developer
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Join our London team as a Senior Full Stack Salesforce Developer. Leverage your 5+ years of experience with C#, .NET, ASP.NET MVC, and modern JavaScript frameworks. You will design integrations and build robust e-commerce solutions on Salesforce Commerce Cloud. This role offers a chance to lead i...
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United Kingdom , London
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Not provided
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Wolverine Worldwide
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About the Senior Developer role

Senior Developer Jobs represent the pinnacle of technical expertise and leadership within software engineering teams. Professionals in these roles are seasoned experts who not only write high-quality code but also architect complex systems, guide technical strategy, and mentor less experienced engineers. They are the crucial bridge between high-level business objectives and practical, robust technical implementation, ensuring that software solutions are scalable, secure, and aligned with long-term organizational goals.

Typically, a Senior Developer is responsible for the entire software development lifecycle of significant components or applications. This includes leading the design and architecture of new systems, often leveraging modern paradigms like microservices and event-driven architecture. They write, review, and debug complex code, setting standards for quality and maintainability. A key part of their role involves making pivotal technology stack decisions, selecting frameworks, databases, and tools that best fit project requirements. They collaborate closely with cross-functional teams, including product managers, business analysts, and other stakeholders, to translate business needs into technical specifications. Furthermore, Senior Developers are expected to drive best practices in coding, testing, and deployment, frequently overseeing CI/CD pipelines and advocating for DevOps and security principles (DevSecOps).

The common skill set for these jobs is both deep and broad. Mastery of one or more core programming languages (such as Java, Python, C#, or JavaScript) and their associated ecosystems is fundamental. Expertise in relevant frameworks (e.g., Spring Boot, .NET Core, React, Angular) is essential. Senior Developers possess a strong grasp of system design principles, database management (both SQL and NoSQL), and API design (REST, GraphQL). Experience with cloud platforms (AWS, Azure, GCP), containerization (Docker), and orchestration (Kubernetes) is increasingly standard. Beyond technical prowess, soft skills are critical: leadership, clear communication, effective mentorship, problem-solving, and the ability to manage time and priorities across multiple projects are what distinguish a senior professional.

Typical requirements for Senior Developer jobs often include a bachelor’s degree in computer science or a related field (or equivalent practical experience) and a substantial track record, usually between 5 to 10+ years of progressive software development experience. Demonstrated experience in leading development initiatives, making architectural decisions, and working within Agile/Scrum methodologies is commonly sought. The role demands a proactive, strategic thinker who stays abreast of emerging technologies and can drive innovation while ensuring system reliability and performance. For those seeking to advance their impact beyond pure coding into areas of design, strategy, and team leadership, exploring Senior Developer jobs is the definitive next step in a thriving tech career.