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Senior Software Engineer - Systems United Kingdom Jobs

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Senior Software Engineer (PHP)
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Join our Data Management team as a Senior Software Engineer (PHP). You will architect and build features from scratch, handling large data volumes and ensuring high code quality. This UK-based role offers an attractive compensation package with equity and a personal learning budget.
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United Kingdom
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Supermetrics
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Senior Software Engineer (Python)
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Join Supermetrics as a Senior Python Engineer on the Data Storage team. Develop our next-gen scalable data transfer system and new storage layer, foundational for AI and ML capabilities. We seek 6+ years of backend SaaS experience with data pipelines and APIs. Enjoy competitive pay, equity, a lea...
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United Kingdom
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Supermetrics
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Senior Software Engineer
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Join Barclays as a Senior Software Engineer in Knutsford/Manchester. Design and develop high-quality Java/Spring Boot APIs, re-architecting key systems. Collaborate in agile teams, championing best practices and secure coding. Enjoy benefits like private medical care and a competitive pension.
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United Kingdom , Knutsford; Manchester
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Barclays
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Senior Software Engineer in Test
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Join Arm's Software group in Cambridge or Bristol as a Senior Software Engineer in Test. You will design tests and enhance automation frameworks for next-gen architectures. We seek an expert in C/C++, Python, and CI methodologies with strong system-level understanding. Enjoy comprehensive benefit...
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United Kingdom , Cambridge; Bristol
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ARM
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Senior Frontend Software Engineer
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Join Atlassian in London as a Senior Frontend Software Engineer. You will build and modernize frontend infrastructure using React, JavaScript (ES6), and modern testing frameworks. Drive complex projects, mentor junior engineers, and deliver impactful user experiences. Enjoy benefits including hea...
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United Kingdom , London
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Atlassian
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Senior Golang Software Engineer
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Join Citi's pioneering team in London as a Senior Golang Engineer. Lead the 0-1 build of innovative AI products and platforms, leveraging your expertise in Golang, large-scale ML systems, and MLOps. Enjoy a hybrid model, competitive salary, bonus, and comprehensive benefits while defining the fut...
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United Kingdom , London
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Citi
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Senior Software Supply Chain Security Engineer
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Join our London team as a Senior Software Supply Chain Security Engineer. You will design and implement secure, cloud-centric solutions using AWS, Kubernetes, and Terraform. Champion DevSecOps practices and integrate security into CI/CD pipelines within an inclusive, flexible culture. Drive engin...
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United Kingdom , London
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Citi
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Senior Software Engineer
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Join a Cambridge-based quantum computing leader as a Senior Software Engineer. Develop cutting-edge cloud infrastructure using Python, AWS/Azure, and Terraform. Enjoy flexible work, equity, and collaborate with world-class innovators on revolutionary quantum AI and cybersecurity platforms.
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United Kingdom , Cambridge
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Gitmax
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Senior Software Engineer
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Join our London team as a Senior Software Engineer. You will design technical architecture and lead complex projects in Scala/Python, shaping the SolstiCE platform. This role offers a bonus, private medical care, and 27 days' leave. Drive efficiency and automation for our Equity Derivatives busin...
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United Kingdom , London
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Citi
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Senior Full-Stack Software Engineer
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Join our London team as a Senior Full-Stack Engineer. Drive innovation using Go, Python, and React within a product-focused, agile environment. Enjoy a hybrid model, 27 days leave, bonus, and comprehensive benefits while revolutionizing controls management.
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United Kingdom , London
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Citi
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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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Explore Senior Software Engineer - Systems jobs and discover a pivotal role at the intersection of software development and core infrastructure. Professionals in these positions are the architects and builders of the foundational platforms, services, and frameworks that power large-scale, reliable, and performant applications. Unlike roles focused solely on end-user features, Senior Software Engineers in Systems delve into the underlying engine, optimizing for scalability, resilience, and efficiency to support millions of users and complex data flows. Typically, individuals in this profession are responsible for designing, developing, and maintaining critical system-level software. This includes creating distributed systems, high-throughput data pipelines, low-latency services, and robust platform infrastructure. Common responsibilities involve architecting scalable solutions, conducting deep-dive performance analysis and debugging across the entire software stack, establishing engineering best practices and standards, and providing technical leadership and mentorship to other engineers. They own the full lifecycle of system components, from conceptual design and implementation to deployment, monitoring, and iterative improvement. The role demands a unique blend of deep technical expertise and strategic vision. Typical skills and requirements include extensive experience with systems programming languages such as C++, Go, Java, or Rust, and a profound understanding of computer science fundamentals like data structures, algorithms, operating systems, and networking. Expertise in distributed systems concepts—including consensus, consistency, and fault tolerance—is paramount. These engineers are proficient in profiling and debugging complex systems, often needing to trace issues from high-level application logic down to native code or kernel interactions. A performance-first mindset, experience with cloud-native technologies and containerization, and a strong grasp of CI/CD pipelines and observability tools are standard expectations. Leadership skills are crucial, as these senior professionals champion technical excellence, drive architectural decisions, and elevate the entire engineering organization through mentorship and the establishment of a culture focused on robustness and scalability. For those seeking to solve the most challenging engineering problems and build the bedrock upon which digital experiences stand, exploring Senior Software Engineer - Systems jobs offers a career path defined by high impact, continuous learning, and shaping the technological future of an organization.

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