Senior Full Stack Engineer at VANRATH – Belfast | Jobyssey

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 TypeScript/JavaScript skills and solid software engineering fundamentals.

You should be comfortable working across both front end and backend, with particular strength in:

TypeScript / 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 TypeScript, Java, C# or another object-oriented language
Designing reliable batch processing and data-processing solutions
SQL and/or NoSQL 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, WebSockets, 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/TypeScript 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 significant investment in technology and is building a next-generation platform from the ground up, working closely with a leading global cloud provider.

This provides an excellent opportunity for an experienced engineer to work on modern technology within a technically strong and collaborative environment.

Why Join?

Work on a next-generation platform rather than simply maintaining legacy technology
Modern AWS/cloud environment
Exposure to large-scale, high-performance financial technology
Work alongside experienced engineers and technical architects
Strong opportunities for technical progression
International engineering environment
Hybrid working from Belfast
Competitive salary and benefits package

The team owns its services throughout the full production lifecycle, so there may occasionally be a requirement to support production incidents outside standard working hours.

If you're a Senior Engineer who enjoys understanding how systems work, solving difficult technical problems and building software properly, we'd like to hear from you.

For further information on this Senior Full Stack Engineer opportunity, apply via the link or contact the VANRATH office for a confidential discussion today.

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Skills:
Full Stack Engineer Senior Software Developer Senior Software Engineer Full Stack Developer

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