Principal Data Scientist jobs in Belfast

You will help set the direction for AI and data science across the business, driving the adoption of modern AI development practices and scalable, cloud‐native architectures at enterprise scale.

You will provide technical and thought leadership, engaging with C‐level and senior stakeholders to define architectural principles and strategic direction.

You will work on modernizing authentication and login experiences across multiple consumer applications, helping drive growth through high-quality user experience, experimentation, and data-driven decision making. This is a collaborative role, working closely with engineers, product managers, and cross-functional partners in a fast-paced environment.

You will work across a variety of complex analytical problems, owning experimentation end-to-end—even when ideal conditions such as user randomisation or high statistical power are not present.

You will work on real production problems rather than research-only work, owning models from first iteration through to live deployment.

You will collaborate closely with other data scientists, data engineers, and DevOps, with the freedom to shape how GenAI and ML are used across the platform.

You will design and build the systems that identify the signals that matter most for visibility, the retrieval and embedding architecture that feeds the models, the ranking and scoring framework that prioritises actions and the evaluation layer that measures how different LLMs behave across queries, surfaces and contexts.

Data Scientist - £70k | Remote / Hybrid | FinTech / Payments We’re working with an established FinTech / Payments business that has been helping customers manage and move money globally for many years. The company builds technology-led products that support low-cost, multi-currency payments and money management, operating across several regulated markets. They’re now investing further in their...

You will have the flexibility you need to do your best work with hybrid work options.

You will help us foster a safe and respectful workplace, where we invite everyone to bring their whole selves to work using their unique talents, backgrounds and expertise to create transformational outcomes for our clients.

You will define technical strategy, design scalable data systems, mentor senior engineers, and partner closely with product, engineering, analytics, and business leaders to transform strategic goals into robust, data-driven solutions.

You will work closely with Director-level stakeholders, the wider DoJ Finance team, DoF, governance boards, and external partners, contributing to both in-year and strategic financial planning.

Are you looking for a career move that will put you at the heart of a global financial institution? Then bring your skills in data analysis, problem solving and presentation to working as a Data scientist in the Markets Capital Advancement team, to help Markets effectively manage capital. By Joining Citi, you will become part of a global organisation whose mission is to serve as a trusted...

You will work closely with your colleagues in our Group Data Office within Technology & Innovation (T&I), and with senior managers and teams across our businesses to identify, prioritise, plan, and execute on opportunities to derive business value from data.

You will be working as part of a wider team, dedicated to using to extract actionable intelligence from data, to deliver on a client's strategy.

You will liaise with internal and client SMEs to understand the data and technology landscape, propose and design analytics and AI solutions and deliver client outcomes.

You will be joining an established team of Ground Engineers within the Scotland and Ireland region, will be based in the AECOM Belfast Office and will work closely with colleagues across the UK & Ireland.

You will have the flexibility you need to do your best work with hybrid work options.

A leading AI solutions provider in Northern Ireland seeks a Principal Data Scientist to lead large-scale AI projects and mentor a community of data scientists. The ideal candidate will have strong technical leadership and deep AI/ML expertise, capable of engaging C-level stakeholders. Join a diverse team committed to innovation and ethical AI practices. Competitive salary and career growth...

You will have the flexibility you need to do your best work with hybrid work options.

You will help us foster a safe and respectful workplace, where we invite everyone to bring their whole selves to work using their unique talents, backgrounds and expertise to create transformational outcomes for our clients.

You will work closely with our Healthcare Chief Technology Officer, account leads and delivery leaders to understand client needs, shape new opportunities, and design impactful Data and AI solutions that improve outcomes across the UK healthcare system.

You will shape data strategy, design and deliver fit-for-purpose data architectures, and provide assurance across all stages of delivery.

You will: Be ready to take the next step in your career, delivering and coordinating design packages on complex infrastructure programmes. Lead technical design teams on a diverse range of projects from concept to construction stage, including: Major highway projects (to DMRB UK & Ireland Standards).

You will have the flexibility you need to do your best work with hybrid work options.

You will have the opportunity to apply your skills, knowledge and expertise on both national and international projects.

You will be client-facing and will take responsibility for technical project delivery and business development, reporting to the Marine Ecology Lead.

You will have excellent writing and communication skill, able to tailor complex scientific information for different audiences.

You will form part of our strong multi-disciplinary team delivering varied and interesting projects for a variety of public and private clients in the UK and Ireland.

You will have the flexibility you need to do your best work with hybrid work options.

You will support members of the wider team to help in the delivery of the ecological aspects of these projects.

You will collaborate with the wider multi-disciplinary AECOM team to maximise the beneficial outcomes for nature and our clients.

You will have the flexibility you need to do your best work with hybrid work options.