HR Business Partner Manager

We have a current opportunity for a HR Business Partner Manager on an inside IR35 contract basis. The position will be based in London 2/3 days in the office. For further information about this position please apply.

The Opportunity

Are you a proven HR leader who thrives in fast-paced, transformational environments? Do you enjoy working across complex projects with a mix of operational and strategic challenges? Then you could be our next Interim HR Business Partner Manager.

In this maternity cover role, you'll partner closely with our HR leadership and wider Business Partnering teams to deliver high-impact HR projects and provide expert guidance across the Sizewell C business. From optimising TUPE and IR35 processes to supporting business units with people strategy and workforce development-you'll be at the forefront of enabling a high-performing, future-ready organisation.

Why Sizewell C?

We're entering a new phase of delivery-moving from planning to construction-and our HR team is right at the heart of it. This is an exciting moment to join a business that's not only driving the UK's Net Zero ambitions but also creating lasting social value through thousands of skilled jobs.

You'll enjoy the rare opportunity to help shape the people strategy of a major project from the ground up, while gaining exposure to transformational change, organisational growth, and strategic HR delivery at scale.

What You'll Be Doing

• Leading and delivering high-profile HR projects (including TUPE, IR35, and process innovation)
• Partnering with HR Business Partner Managers and their teams to support functional and delivery areas
• Supporting workforce planning, performance, and talent management initiatives
• Driving change, continuous improvement, and best practice in a dynamic and evolving environment
• Acting as a senior point of contact across HR and the wider business, influencing and advising senior stakeholders

What You'll Bring

• A solid HR generalist background, with a track record of delivering complex people projects
• Expertise in employment law, HR strategy, and partnering in a fast-paced or start-up/subsidiary environment
• Experience with TUPE and IR35 (ideal but not essential)
• Strong stakeholder engagement and influencing skills-you'll be confident working across senior leadership
• Flexibility, pragmatism, and a proactive, solutions-focused mindset

Rullion celebrates and supports diversity and is committed to ensuring equal opportunities for both employees and applicants.