Senior UI Engineer (Belfast, UK)

Congruity360; Belfast City District; Hybrid; GBP 60,000 - 90,000; Full time

Benefits offered by this job

Pension scheme.

Flexible working hours and hybrid work

Health insurance and wellness programs

Generous holiday leave and paid time

Flexible working policy

Volunteer policy

Job summary

Congruity360 is seeking a Senior UI Engineer to join our engineering team in Belfast. You will focus on React-based interfaces, collaborate with designers and product managers, and contribute to a fast-paced development cycle delivering secure, data-rich applications.

The role requires strong JavaScript/TypeScript, 3+ years React, WCAG, and experience with component libraries. Hybrid work with at least two days in the Belfast office, and a passion for creating accessible, high-performance UI.

Qualifications

• 5+ years of experience in front-end development.
• Experience translating complex requirements into intuitive UI.

Responsibilities

• Own and drive UI decisions for React-based interfaces.
• Collaborate with designers and product managers to translate requirements into deliverables.
• Code in a fast-paced development environment with a focus on quality and performance.
• Ensure accessibility and responsive design across data-rich interfaces.

Skills

TypeScript

JavaScript

React

UX design

WCAG

Semantic HTML

Component libraries

Tailwind CSS

REST APIs

State management

Data-rich interfaces

Performance optimization

Education

University degree in Computer Science, Mathematics, Physics, or related field

Tools

React Aria

Radix

Tailwind CSS

D3

visx

ECharts

TanStack Table

Job description

Job Title

Senior UI Engineer

Department

Engineering

Reports To

Team Lead

Working Pattern

Hybrid – minimum 2 day per week in Belfast office

Location

Belfast, Northern Ireland (Role is NI based. Candidate must have right to live and work in UK)

Salary

Negotiable

Company background

Congruity360 is headquartered in Boston with employees across the US, England and Northern Ireland. The Congruity360 flagship product, Classify360, enables clients to reduce their financial and data risk by increasing their data understanding, classification, and security, allowing clients to meet all of the current, new, and changing laws, regulations, and business drivers. In other words, making intelligent business decisions.

Job Summary

A new product offering is emerging from concept phase, which expands our solution set from compliance and data governance into cybersecurity. This role offers the opportunity to work in emerging technologies with a primary focus on a React skillset. The successful candidate will be an integral part of a dynamic team, coding in a fast-paced development environment, generating creative solutions to solve customer needs and challenges. The successful candidate will be actively involved in driving technical decisions within the team, with a desire to produce high quality software to provide a superior client experience.

Education requirements

• A University degree (or equivalent) in Computer Science, Mathematics, Physics, or related field

Experience

• 5+ years relevant software engineering and development experience
• Proactive attitude with great communications skills, attention to detail, self-motivated, and the ability to work well with people are essential

Essential Criteria

• 5+ years Typescript/JavaScript
• 3+ years React
• UX experience working with designers / product managers to translate requirements into intuitive interfaces
• Accessible, responsive UI development, including practical knowledge of WCAG and semantic HTML
• Experience with component libraries (React Aria, Radix or similar) and Tailwind CSS or comparable
• Experience with data-rich interfaces, including large tables, charts and visualisations
• Frontend performance optimisation, particularly for complex interfaces and large datasets
• Consuming and shaping REST APIs; state management for complex, long-lived workspaces

Desired Criteria

• Enterprise software development
• Advanced charting, data visualisation and virtualisation using tools such as D3, visx, ECharts or TanStack Table
• Architecture experience designing new products or systems
• Building and maintaining reusable component libraries and design systems
• Cybersecurity or analyst-tooling experience, including audit trails and role-based access controls
• CI/CD pipelines and AWS or Azure exposure
• Node.js development
• Vue experience
• Agile, cross-functional delivery

Company Benefits

• Pension scheme.
• Flexible working hours and hybrid work options.
• Health insurance and wellness programs.
• Generous holiday leave and paid time off.
• Flexible working policy
• Volunteer policy