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Senior Developer United Kingdom, Belfast Jobs

5 Job Offers

Senior Java Developer (Smart Order Routing (SOR)) - Equities Electronic Trading
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Senior Java Developer sought for VP-level role in Equities Electronic Trading in Belfast. You will design and optimize a core low-latency Smart Order Router (SOR) using high-performance Java and microservices. Requires expert JVM internals, concurrency, and FIX protocol knowledge. Benefits includ...
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United Kingdom , Belfast
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Not provided
https://www.citi.com/ Logo
Citi
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Until further notice
Senior Java Developer (AVP)
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Senior Java Developer (AVP) at Citi in Belfast. Join a global team redefining finance, building high-scale systems that process $5 trillion daily. You will develop robust applications using Core Java, Spring Boot, and Microservices, with hands-on AI tool experience. Enjoy 27 days leave, bonus, pr...
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United Kingdom , Belfast
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Not provided
https://www.citi.com/ Logo
Citi
Expiration Date
Until further notice
Senior Java Developer
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Senior Java Developer sought by Citi Belfast to design and deploy microservices and RESTful APIs using Spring Boot. Requires 5+ years of core Java expertise, multi-threading, and Spring Framework proficiency. Join a global banking leader offering hybrid work, 27 days leave, private medical care, ...
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Location
United Kingdom , Belfast
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Not provided
https://www.citi.com/ Logo
Citi
Expiration Date
Until further notice
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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Location
United Kingdom , Belfast
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Not provided
https://www.citi.com/ Logo
Citi
Expiration Date
Until further notice
Senior AI Frontend Engineer (Developer Productivity)
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Join Citi in Belfast as a Senior AI Frontend Engineer. Leverage your deep React/TypeScript expertise to build the UI for a next-gen AI Developer Productivity platform. You'll transform cutting-edge Generative AI into intuitive experiences for 50,000+ global engineers. Enjoy top benefits including...
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Location
United Kingdom , Belfast
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Salary
Not provided
https://www.citi.com/ Logo
Citi
Expiration Date
Until further notice

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.