Senior Full Stack Engineer

Senior Full Stack Engineer Belfast | Hybrid | Competitive Salary  Benefits Are you a Senior Full Stack Engineer who enjoys getting into the detail of how software actually works? We're working with a global financial technology organisation that is investing heavily in a new generation of cloud-based platforms supporting critical financial markets infrastructure. This is a genuinely hands-on engineering role.

We're looking for someone who can do more than build features, someone who understands how APIs behave, why applications slow down, how React works under the hood, how to build accessible front ends, and how to design reliable processing for large volumes of data. You'll join a highly experienced engineering team working closely with a major global cloud provider, with the opportunity to contribute to a modern platform being developed from the ground up.

Salary & Benefits Competitive salary and benefits package Hybrid working from Belfast Opportunity to work with modern AWS and cloud technologies Excellent technical development and career progression opportunities Collaborative, international engineering environment Opportunity to work on next-generation financial technology Right to Work:
Applicants must have full, unrestricted right to work in the UK without requiring employer sponsorship. Unfortunately, visa sponsorship is not available for this position. About You We're looking for a strong Senior Full Stack Engineer with excellent Type Script/JavaScript skills and solid software engineering fundamentals. You should be comfortable working across both front end and backend, with particular strength in:
Type Script / JavaScript and React Strong understanding of React fundamentals, component design, state management and rendering Strong knowledge of HTML structure, semantic HTML and web accessibility Building and troubleshooting REST APIs, including understanding API responses, status codes, payloads, errors and performance Diagnosing and resolving application and solution performance issues Backend development using Type Script, Java, C# or another object-oriented language Designing reliable batch processing and data-processing solutions SQL and/or No

SQL databases AWS and modern cloud technologies Microservices and event-driven architectures Automated unit, integration and end-to-end testing CI/CD, Git and modern software engineering practices

Experience with GraphQL, Web Sockets, Terraform and containerisation would also be beneficial. The Type of Engineer We're Looking For This isn't a role where you need to know every technology listed above. We're particularly interested in engineers who can understand problems, investigate them properly and explain their technical decisions. You'll be someone who:
Can troubleshoot rather than simply identify that something isn't working Understands what happens between a front end, API and backend service Can investigate performance bottlenecks and improve system behaviour Has strong front-end fundamentals rather than relying purely on frameworks Thinks about accessibility, maintainability and quality when building UI Understands how to process data reliably at scale Can challenge technical approaches constructively Is comfortable taking ownership of production-quality software Enjoys mentoring and raising engineering standards within a team What You'll Do Design, develop, test and deploy high-quality full-stack solutions Build modern React/Type Script applications and supporting backend services Develop and integrate APIs and investigate API and application issues Diagnose and improve application performance Design reliable batch and data-processing solutions Contribute to scalable, reusable and maintainable services Refactor and modernise existing systems Contribute to architecture and technical design decisions Improve engineering practices, testing and development standards Work closely with architects, technical leads and engineers across the wider organisation Mentor and support less experienced engineers Take ownership of services throughout their production lifecycle About Your Next Employer Our client is a global organisation operating across multiple international markets, with a strong reputation within financial technology and market infrastructure.

The Belfast engineering team forms part of a wider global technology function, developing highly scalable, low-latency services that support the organisation's international operations. The business is making…