The Geotechnical Sub Alliance (GSA) is proud to play a crucial part in delivering the Sizewell C nuclear power station — one of the UK’s most significant infrastructure projects. Our team focuses on advanced geotechnical works including piling, diaphragm walling, soil mixing, grouting and more, using specialist equipment and a collaborative alliance model.

We are now seeking a highly organised and proactive Recruitment & HR Administrator to join our HR team and support our growing workforce as the project continues to scale.

About the role:

As a Recruitment & HR Administrator, you will provide essential administrative support across all HR and Recruitment functions. From coordinating interviews and managing onboarding, to supporting visa processes and ensuring compliant right‑to‑work documentation, you’ll play a key role in creating a smooth employee experience.

This is a varied, fast-paced role ideal for someone who enjoys working with people, thrives on organisation, and takes pride in delivering high‑quality support.

Key Responsibilities

Recruitment Support

• Track and monitor applications throughout the recruitment lifecycle
• Screen CVs and coordinate candidate feedback
• Schedule interviews and support hiring managers with admin tasks
• Triage the Recruitment Inbox
• Work closely with the Recruitment Manager to ensure a smooth process
   

Visa & Right-to-Work Compliance

• Liaise with overseas Group Companies to obtain required visa documentation
• Work with Immigration Advisors to support visa submissions
• Conduct right‑to‑work checks and maintain compliant records
• Liaise with the Home Office and immigration agencies as needed
   

Employee Integration & Site Support

• Act as the first point of contact for visitors, new starters, and agency workers
• Coordinate onboarding tasks such as IT equipment collection, medical appointments, and site integration support
• Assist with ongoing support for UK‑based and international employees
   

General HR Administration

• Handle telephone and email enquiries on behalf of the HR team
• Draft correspondence including emails, letters, and employee communications
• Prepare contracts of employment and update the HR system for new starters
• Manage pre‑boarding requirements (IT, fleet, medicals, vetting)
• Process changes to terms and conditions
• Ensure all employee medical certifications are up to date
• Triage the HR email Inbox
• Provide wider office administration support as required
   

What We’re Looking For

Essential:

• Previous administration and data entry experience
• Excellent communication and interpersonal skills
• Strong organisational and planning capability
• Ability to build positive working relationships at all levels
• Proficient in Microsoft Office (Excel essential)
• Positive, resilient, and confident approach

Preferred:

• Experience in HR or Recruitment administration
• Customer-facing background

Desirable:

• Ability to speak French

If you’re an organised, people-focused administrator looking to build your HR career within a major national infrastructure project, we’d love to hear from you.

Apply now and be part of building the future of sustainable energy.