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Senior Software Engineer United Kingdom Jobs

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Senior Software Engineer - Build AI Tools
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Join Citi's new GenAI Security team in Belfast as a Senior Software Engineer. Design and build a scalable security platform to protect AI applications from adversarial attacks. Leverage your expertise in Python/Go and secure APIs within a collaborative, cutting-edge environment. This role offers ...
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United Kingdom , Belfast
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Citi
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Senior Software Engineer
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Join a scaling B2B SaaS firm in London, building a global compensation intelligence platform. As a Senior Software Engineer, you'll own core features end-to-end with TypeScript across the stack. We seek a collaborative expert who designs scalable systems and mentors peers, offering a clear path t...
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United Kingdom , London
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110000.00 GBP / Year
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Oho Group Ltd
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Senior Software Engineer
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Join Equinox in London as a Senior Software Engineer. Lead complex projects, design system architectures, and mentor junior developers using Java and Kafka. Enjoy a hybrid model, bonus, private healthcare, and 27 days leave.
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United Kingdom , London
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Citi
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Senior Software Engineer
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Join Citi's Developer Enablement team in Belfast as a Senior Software Engineer. You will build internal platforms and tools using Java/Kotlin, microservices, and Kafka to improve the SDLC for thousands of engineers. We seek expertise in cloud-native tech, DevOps, and CI/CD. Enjoy excellent benefi...
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United Kingdom , Belfast
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Citi
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Senior Software Engineer
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Join Citi's XiP team in London as a Senior Software Engineer. Design and optimize the core distributed Risk Calculation Engine for global trading desks. Leverage your deep Java, Spring, and large-scale system expertise in a pivotal role. Enjoy global benefits supporting your well-being and profes...
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United Kingdom , London
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Citi
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Senior Software Engineer
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Join our London team as a Senior Full Stack Engineer. You will develop and maintain the global accesso Horizon platform using Java, JSP, and SQL. We seek 5+ years' experience with cloud scalability, unit testing, and Scrum. Enjoy flexible hours, virtual team events, and a commitment to diversity.
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United Kingdom , London
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accesso
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Senior Frontend Software Engineer
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Join Addepar's high-impact Partner Platform team in Edinburgh as a Senior Frontend Software Engineer. You'll architect scalable solutions on a data lakehouse, integrating diverse data sources and enabling powerful analytics. This role requires strong frontend skills, backend experience (Python/Ja...
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United Kingdom , Edinburgh
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Addepar
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Senior Software Engineer
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Join our In-Car Payments Engineering team in London as a Senior Software Engineer. You will build secure, cloud-based transaction systems using TypeScript, Node.js, and AWS serverless services. Your expertise in PCI DSS, API security, and Terraform will be key to delivering cutting-edge in-car co...
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United Kingdom , London
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Arrive
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Senior Software Engineer
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Join our London team as a Senior Software Engineer. You will develop scalable PHP/MySQL platforms and RESTful APIs on AWS, focusing on performance and security. We value expertise in modern CI/CD, software architecture, and mentoring. Enjoy a collaborative, supportive, and inclusive work environm...
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United Kingdom , London
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Arrive
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Senior Frontend Software Engineer
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Join Blis in Edinburgh as a Senior Frontend Engineer. You will build customer-facing web apps for complex ad campaigns using React, TypeScript, and modern tooling. Leverage 7+ years of experience to create beautiful data visualizations from geospatial and big data. This is a key role in a tech-fi...
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United Kingdom , Edinburgh
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Blis
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Senior Software Engineer
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Join Blockchain.com as a Senior Software Engineer in London. Build low-latency trading systems in RUST, focusing on OMS and exchange gateways. Leverage your Python, SQL, and trading systems expertise in a hybrid role with a "work from anywhere" policy, equity, and unlimited vacation.
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United Kingdom , London
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Blockchain
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Senior Software Engineer - Cloud Infrastructure
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Join ClickHouse Cloud as a Senior Software Engineer in London. Design and build robust, scalable cloud infrastructure using Go and Kubernetes on AWS/Azure/GCP. Enjoy a flexible remote role with equity, healthcare, and a home office stipend in a globally distributed team.
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United Kingdom , London
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ClickHouse
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Senior Software Engineer - Data Integration & JVM Ecosystem
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Join ClickHouse as a Senior Software Engineer, focusing on Data Integration and the JVM ecosystem. You will build and maintain critical connectors for tools like Kafka, Spark, and Flink, ensuring seamless data access. This remote UK role requires deep Java/JVM expertise and experience with scalab...
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United Kingdom
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ClickHouse
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Senior Software Engineer (Infrastructure) - HyperDX
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Join ClickHouse to revolutionize developer observability with HyperDX. As a Senior Infrastructure Engineer, you'll build scalable, cloud-native backend systems using TypeScript, Kubernetes, and ClickHouse. This remote UK role offers equity, healthcare, and a flexible work environment for experts ...
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United Kingdom
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ClickHouse
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Senior Software Engineer (Infrastructure)
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Join our London team as a Senior Infrastructure Software Engineer. Build and own scalable backend systems for massive AI training datasets using PostgreSQL, ClickHouse, and Python/Typescript. Enjoy a competitive package with equity while solving complex problems in a high-performance, in-person c...
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United Kingdom , London
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Encord
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Senior Fullstack Software Engineer
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Join a leading digital consultancy as a Contract Senior Fullstack Engineer in London. Design and build high-performance, scalable software systems using Angular, Java, and Node.js. Lead technical decisions, mentor engineers, and drive best practices in a dynamic, project-focused environment.
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United Kingdom , London
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Formula Recruitment
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Senior Software Engineer
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Join a leading European logistics provider as a Contract Senior Software Engineer. Design, build, and maintain impactful software solutions using Python, React, T-SQL, AWS, and Terraform. Collaborate with cross-functional teams in a fast-paced UK-based role to drive innovation and operational eff...
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United Kingdom
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Formula Recruitment
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Senior Software Engineer
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Join a leading UK D2C health brand as a Senior Full Stack Engineer. Utilize your 8+ years of expertise in C#, .NET, TypeScript, and React to build scalable digital platforms. Enjoy flexible remote work and a bonus while driving innovation in a high-growth environment.
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United Kingdom
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70000.00 - 90000.00 GBP / Year
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Harmonic Operations™ | Certified B Corp
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Senior Software Engineer - UltraGrid
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Join our experienced team in London as a Senior Software Engineer for the mission-critical UltraGrid engine. You will architect and optimize high-performance, cost-efficient systems using Java/Scala, with Rust as a bonus. We offer competitive compensation, stock options, comprehensive benefits, a...
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United Kingdom , London
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Hypervolt Limited
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Senior Software Validation and Verification Engineer
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Join Instro in Sandwich as a Senior Software V&V Engineer. Develop robust test environments and processes for new product firmware within an agile, multi-disciplinary team. This role requires SC clearance eligibility and offers a competitive package including profit sharing.
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United Kingdom , Sandwich
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Instro Precision
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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.

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