Frontend Engineer II (React)

TL;DR

Frontend Engineer II (React): Building and optimizing mission-critical React applications for a global sell-side advertising platform with an accent on UI/UX implementation and complex data handling. Focus on designing responsive components, ensuring system stability through unit testing, and collaborating across time zones to solve real-time ad-serving challenges.

Location: Must be based in Belfast, Northern Ireland. This is a hybrid role requiring 3 days per week (Tuesday, Wednesday, Thursday) in the Belfast office.

Company

hirify.global is the world’s largest independent sell-side advertising platform, powering billions of transactions daily across CTV, online video, display, and audio formats.

What you will do

• Develop and maintain production-ready React applications for ad-serving lifecycle management.
• Translate design mocks into high-fidelity, responsive, and reusable UI components.
• Collaborate with global engineering teams in the US to deliver quality software.
• Write clean, unit-tested code to ensure application stability and performance.
• Respond to feature requests, bug reports, and performance issues in production.
• Participate in daily cross-functional syncs during core overlap hours (3 pm – 5 pm GMT).

Requirements

• Must be based in or able to work from the Belfast office.
• Extensive experience building and scaling modern, high-traffic React applications.
• Strong proficiency in front-end data handling and integration with RESTful services.
• Deep understanding of browser performance, state management, and asynchronous programming.
• Availability during core overlap hours (3 pm – 5 pm GMT) for collaboration with US teams.
• Minimum of a B.S. in CS, EE, Math, Physics, or a related field.

Culture & Benefits

• Hybrid work schedule with 2 days remote and 3 days in-office.
• Comprehensive benefits including private medical insurance and competitive pension plan.
• Equity and Employee Stock Purchase Plan.
• Support for career development, mental health, and wellness.
• Office perks including provided lunches, snacks, and training opportunities.