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 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 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 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.

Reposted 2 Days Ago Be an Early Applicant Belfast, County Antrim, Northern Ireland Belfast, County Antrim, Northern IrelandAs a Principal Mechanical Engineer, lead technical design work on projects, manage budgets, collaborate with teams, and ensure high-quality standards in mechanical design across various summary above was generated by AI Shape the Future of our cities and environments. Are you...

MCS Group is looking for a highly experienced Principal React Developer to lead the design and delivery of modern, scalable front-end applications. This is a hands-on role where you'll shape architecture, set best practice, and mentor engineers within a collaborative product-focused team. This is a key hire for this development team, and will be a position of technical influence within the...

Senior/Principal Civil Water Engineer Full time 2026-01-26 Posted Today R-147187 Job Description Overview Shape the future of our cities and environments. Are you a Civil Water Engineer who is passionate about making the world a better place?Are you ready to take up a vital role in some of the UK's most exciting and innovative projects? Join AtkinsRéalis and take a leading role in shaping the...

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.

Principal Clean Water Process Engineer Full time 2026-01-28 Posted Today R-147472 Job Description Overview Shape the Future of our cities and environments. Are you a Clean Water Process Engineer who is passionate about making the world a better place? Are you ready to take up a vital role in some of the UK's most exciting and innovative projects? Join AtkinsRéalis and take a leading role in...

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.

Principal Waste Water Process Engineer Full time 2026-01-26 Posted Today R-147229 Job Description Overview Shape the Future of our cities and environments. Are you a Waste Water Process Engineer who is passionate about making the world a better place? Are you ready to take up a vital role in some of the UK's most exciting and innovative projects? Join AtkinsRéalis and take a leading role in...

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.