Onboarding Administrator

The Geotechnical Sub Alliance (GSA) is at the forefront of the Sizewell C nuclear power station development - one of the UK’s largest and most exciting infrastructure programmes.

We’re responsible for preparing the foundations of the entire site: designing and constructing cut‑off walls, retaining structures, soil improvements and more. Using advanced geotechnical engineering and world‑class construction technologies, this is a rare opportunity to contribute to a national project that will shape the UK’s clean‑energy future.

The Role

We are seeking a highly organised and proactive HR Administrator to support the GSA team at Sizewell C. This role is well‑suited to an experienced HR administrator who thrives in a fast‑paced, regulated environment and brings strong attention to detail.

You will provide end‑to‑end HR and recruitment administration support, with particular focus on onboarding, compliance, security vetting and employee integration, playing a key role in supporting workforce readiness on a major infrastructure project.

What You'll Be Doing

• Onboarding: Provide administration support with offers and contracts, and managing pre‑employment checks and onboarding activities.

• Security Vetting & Compliance: Act as a key point of contact for security vetting, coordinating submissions, verifying documentation and liaising with third‑party vetting and qualification providers.

• Right to Work & Immigration: Conduct compliant UK Right to Work checks and support visa and immigration processes, working with overseas group companies, advisors and relevant authorities where required.

• HR Administration & Employee Support: Act as a first point of contact for new starters, visitors and agency workers; support inductions, IT access and medical processes; maintain accurate HR records; manage HR inboxes and correspondence; and ensure confidentiality and GDPR compliance at all times.

What We’re Looking For

Essential

• CIPD Level 3 and/or proven experience in an HR Administration role, ideally within construction, engineering or a regulated environment

• Experience supporting recruitment and onboarding processes

• Strong administrative, data entry and organisational skills

• Excellent attention to detail and accuracy

• Professional, approachable manner with strong verbal and written communication skills

• Ability to manage multiple priorities in a fast‑paced environment

• Strong Microsoft Office skills, particularly Excel

Desirable

• Experience supporting vetting, compliance or security‑sensitive processes

• Experience working on site‑based or major project environments

Why Bachy Soletanche?

When you join the world’s largest specialist geotechnical contractor, you’re part of an international community of over 10,000 experts, based in 31 countries around the world. You’ll have the opportunity to contribute to prestigious, ground-breaking projects, using the very latest tools and technology to solve complex problems, constantly learn new skills and take your career in any direction.

As well as being part of a landmark project and working in a collaborative alliance environment, we offer:

• Discretionary annual bonus (based on personal/project performance)

• Salary Sacrifice Pension Scheme (min. 5% company contribution)

• Enhanced Sick Pay (after probation)

• Income Protection, Private Medical Insurance and Life Assurance

• Employee Assistance Programme

• 25-days annual leave + Bank Holidays per year (increasing with service)

• Option to purchase additional annual leave

• Paid annual professional memberships

• Volunteering days

• Professional growth and development

Bachy Soletanche is committed to equal opportunities in employment with the aim of ensuring that everyone who applies to work for us receives fair treatment. We positively encourage applications from suitably qualified and eligible candidates regardless of age, disability, ethnicity, sex, gender identity, sexual orientation, religion or belief and pregnancy/maternity.