Principal Data Engineer

Assystem is an international company with one mission: accelerate the energy transition around the world.

Every day, our 7,500 switchers located in 12 countries (Europe, Middle East, Pacific Asia & Africa) connect their six thousand billion neurons to tackle the task of the century: switching to low-carbon energy.

We are a collective committed to the actors who are making the energy switch. Sharing our knowledge, expertise and values allows us to innovate and think differently about the energy transition.

Drawing on more than 55 years' experience in highly regulated sectors subject to strict security and safety requirements, we provide our customers with engineering and project management services, as well as digital services and solutions to optimise the performance of complex infrastructure projects throughout their life cycle. The Group is currently ranked third in the world for nuclear engineering.

To ensure a viable, efficient, and reliable energy future for all.

Are you ready to step into a defining leadership role, shaping the UK’s most critical infrastructure and engineering programmes through data excellence?

At Assystem, we deploy expert teams into some of the country’s most complex and high-impact programmes across energy, defence, nuclear, and transportation. As we scale our data capability to meet growing demand, we’re looking for a Principal Data Engineer to lead delivery, set technical direction, and inspire a multi-disciplinary team of data professionals on projects of national importance.

This is your opportunity to own the data function across high-stakes client engagements and act as both technical authority and strategic lead — ideal for a Senior Data Engineer ready to make the leap into a pivotal leadership position.

Your missions:

As our Principal Data Engineer, you’ll:

🎯 Lead and support cross-functional data teams (engineers, analysts, scientists) on complex, high-value programmes.

🎯 Design and deliver robust, secure, and scalable enterprise data solutions tailored to client goals.

🎯 Define and uphold data architecture, pipeline, and modelling best practices across projects.

🎯 Mentor and develop both senior and junior team members, fostering a high-performance culture.

🎯 Represent data delivery in client governance and technical steering groups.

🎯 Champion modern data practices: automation, metadata management, governance, and quality.

🎯 Bridge the tactical and strategic, ensuring delivery is aligned with long-term client visions.

Why join the community of Switchers?

As one of the Top 3 Nuclear Engineering companies in the world, Assystem offer a competitive benefits package which includes:

💥25 days of annual leave + bank holidays

💥8% company pension contributions

💥Healthcare cash-plan to get money back on dental, medical, physical care

💥Employee assistance programme including 24/7 access to free mental health support, virtual gym classes and more

💥Get professional and industry membership fees paid for.

Qualifications/Skills to be successful:

We’re looking for someone who meets (and exceeds) the DDaT Principal Data Engineer standard, with:

🌟 Proven experience leading data development and integration across complex environments.

🌟 Deep expertise in data engineering and modelling, alongside cloud platform proficiency (Azure, AWS, GCP).

🌟 Strong programming skills (Python, SQL) and experience with BI tools (Power BI, IBM Cognos).

🌟 Exceptional stakeholder engagement and communication skills at both technical and executive levels.

🌟 A strategic mindset and hands-on experience managing technical quality across multiple projects or clients.

🌟 Knowledge of sensitive data handling, governance, and compliance in regulated environments.

🌟 Bonus points for experience in: construction data standards (ISO19650), architecture/engineering domains, or orchestration frameworks.

Due to the nature of this role the successful candidate will require SC clearance. To gain this they will be required to be a Sole UK national.

This role can be completed from any AEIL office

We are committed to equal treatment of candidates and promote, as well as foster all forms of diversity within our company. We believe that bringing together people with different backgrounds and perspectives is essential for creating innovative and impactful solutions. Skills, talent, and our people’s ability to dare are the only things that matter !. Bring your unique contributions and help us shape the future.

We are committed to equal treatment of candidates and promote, as well as foster all forms of diversity within our company. We believe that bringing together people with different backgrounds and perspectives is essential for creating innovative and impactful solutions. Skills, talent, and our people’s ability to dare are the only things that matter !. Bring your unique contributions and help us shape the future.