Frontend Software Engineer Job Belfast area,Northern Ireland UK,Software Development

What will you be doing?

Partner as a member of an empowered product team (Product Manager, Product Designer, Team Lead and engineers), sharing accountability for the outcomes your team commits to.
Define the frontend architecture, patterns and conventions for our AI platform as our first frontend engineer, and set the bar for those who join after you.
Build the platform’s web application in Type Script and React, creating fast, intuitive experiences for the world’s largest advertisers.
Bring complex analytics and insights to life through data visualisation and dashboards that make our predictions clear and actionable.
Build agentic and conversational interfaces, including streaming AI responses, that let customers work naturally alongside AI.
Create robust experiences for uploading, processing and reviewing video at scale.
Work API-first against a headless, spec-driven backend, consuming generated clients and helping shape the API contracts your interfaces depend on.
Partner closely with your Product Designer, iterating rapidly from prototype to production and building a component library and design system together.
Put automated testing at the heart of everything you ship, with a fully automated CI/CD pipeline that lets the team release with confidence.
Engineer through Claude Code day to day, building and sharing skills, subagents and workflows that raise the speed and quality of the whole team.
Contribute to continuous product discovery, helping the team assess feasibility early and building quick prototypes to test ideas with customers before we commit.

You need to be this kind of person:

A missionary, not a mercenary. You care deeply about the customer problem and the outcome, not just the code.
Outcome-driven. You measure your success by the change you create for customers and the business, not by tickets closed.
An engineer first, with AI as a force multiplier. You use AI tools to move faster with rigour, not to skip the thinking.
Comfortable with ambiguity and ownership. As our first frontend engineer, you don’t wait to be told how things should be done, you shape it with your team and go.
A clear communicator, able to explain technical trade-offs to product, design, data science and commercial colleagues as well as to fellow engineers.
Curious and a lifelong learner, with the integrity to back your point of view with evidence in front of colleagues, customers and stakeholders.
Able to see the bigger picture without losing attention to detail, you care about the pixels and the performance as much as the architecture.
A natural collaborator, comfortable working with all departments at all seniorities, and equally able to drive work forward independently.
Passionate about (good!) advertising, how it works and how it can be improved or excited to become so.

You need to have the following experience:

To be successful in this role, you will have approximately 3-5 years of real-world frontend engineering experience and be ready to operate as a first-class member of an empowered product team, where you’ll have outsized influence on the outcomes we deliver.

Strong commercial experience building web applications in Type Script with React or another modern component-based framework.
Experience building data-rich interfaces, with a strong track record in data visualisation, dashboards and presenting analytics and insights.
Experience building conversational or agentic interfaces, including handling streaming responses from AI models.
Experience building against headless, API-first backends, ideally consuming clients generated from API specifications.
A testing-first mindset, with hands‑on experience of automated testing and fully automated CI/CD pipelines.
Experience working closely with designers in fast,…