Interim Senior HR Business Partner – Transformation

Location: Sussex (preferred) | Birmingham / Manchester considered | Hybrid (c.1 day/week)

PE-backed, high-growth organisation

£600–£700 per day (outside IR35) | Immediate Start | Until End of Year

Middlemore are partnering with an entrepreneurial, private equity-backed organisation to appoint an Interim Senior HR Business Partner to lead a sizeable transformation programme.

This is a high-impact role embedded within a business undergoing rapid growth and significant change, driven by investment and a focus on automation, AI-led service delivery and achieving operational efficiency.

The opportunity…

You will act as a senior, hands-on HRBP aligned to a 600-FTE client group (mid/back office) and lead the people agenda for a large-scale transformation programme which will see a streamlining of the function as efficiencies are made through Ai/Tech .

This is not a traditional advisory role, you will be responsible for owning and delivering change end-to-end, working closely with senior operational and transformation leaders.

Key responsibilities…

• Lead organisation design and workforce planning, defining the future-state operating model
• Translate strategic transformation goals into practical, deliverable people plans
• Deliver restructuring programmes, including consultation and redundancy processes
• Partner closely with Operations leadership to drive efficiency and cost transformation
• Own the people communication strategy, maintaining engagement through change
• Provide credible challenge and insight to senior stakeholders
• Ensure alignment between HR, Operations and Transformation teams

The Context…

• High-growth, PE-backed environment
• Significant transformation agenda including automation and new-systems implementation
• 600-person client group, UK based.
• Likely workforce evolution including role redesign and reduction by 20-30%
• This role will own and deliver the people side of the transformation end-to-end, with support from a HR Advisory team.
• Fast-paced, evolving environment with strong leadership visibility

What we’re looking for…

• Experienced Senior HRBP / Transformation HR Lead
• Proven track record delivering organisation design, workforce planning and restructuring
• Experience in PE-backed, high-growth or complex transformation environments
• Strong employee relations expertise, including consultation processes
• Highly commercial, pragmatic and delivery-focused
• Comfortable operating hands-on at pace in ambiguous environments
• Confident influencing and challenging senior stakeholders

Why apply…

• Opportunity to lead a business-critical transformation programme
• High visibility with senior leadership and transformation teams
• Work within a fast-growing, PE-backed business
• Immediate start with strong day rate

If you’re an experienced HR transformation specialist who thrives in fast-paced, delivery-focused environments, we’d love to hear from you.