Front End Engineer II

We are looking for an Engineer II to join our Streaming UI team in Belfast. Our team is responsible for building the mission-critical React applications that our publishers and account managers use to navigate the entire ad-serving lifecycle—from managing high-value inventory and deals to utilizing complex tools for diagnostics, reporting, and forecasting. As part of a global engineering powerhouse, you will play a key role in making the complexity of real-time ad serving intuitive and actionable for our users.

You will be joining a predominantly engineering-focused office in Belfast, working in close daily collaboration with our Streaming API teams across New York, Los Angeles, and Colorado. We are looking for a skilled React developer who is comfortable leveraging API and UI mocks to build seamless front-end experiences. You should be a team player who takes pride in writing clean, unit-tested code and is energized by the "golden hour" of collaboration (3 pm – 5 pm GMT) when our UK and US teams sync up to solve problems.

You will spend your time technically hands-on—designing, coding, testing, and engaging with product and engineering peers to turn requirements into reality.

Responsibilities

• Write production-ready code and unit tests that meet both system and business requirements
• Respond to feature requests, bug reports, performance issues and ad-hoc questions
• Work collaboratively with multiple teams to deliver quality software
• Support the operation of services in production

Requirements

• Extensive experience building and scaling modern, high-traffic React applications
• Proficiency in front-end data handling, including the ability to leverage API mocks and integrate seamlessly with RESTful services like Java Spring Boot
• Strong understanding of UI/UX implementation, with the ability to translate design mocks into high-fidelity, responsive, and reusable components
• A proven track record of writing production-ready code and comprehensive unit tests to ensure application stability
• Experience working in a collaborative, distributed engineering environment, specifically with U.S.-based cross-functional teams
• The ability to be available during core overlap hours (3 pm – 5 pm GMT) for real-time collaboration with teams in New York, Colorado, and Los Angeles
• Strong computer science fundamentals, including a deep understanding of browser performance, state management, and asynchronous programming
• A Minimum of B.S. in CS/EE, Math, Physics, or a related field
• The ability to be able to balance high-quality development with pragmatism and the rapid delivery of products
• Creative problem skills and someone who can navigate the complexities of ad serving tools like account dashboards and reporting tools
• The drive to want to work in an environment where software engineers are full participants in shaping the product and the business
• Excellent communication skills and a "team player" mentality
• High attention to detail