Senior HR Advisor

Acorn by Synergie; Cardiff; On-site; GBP 32,000 - 46,000; Full time

Job summary

Acorn by Synergie is seeking a Senior HR Advisor to join a leading organisation in Cardiff on a full-time, site-based basis. The role covers the full employee lifecycle, advising managers, handling ER cases, and delivering HR initiatives within a long-term temporary contract.

You will work Monday to Friday, with flexibility for some home working where appropriate. The successful candidate will have UK employment law expertise, CIPD Level 5 (or working towards it), and strong communication and

Qualifications

• Experience as Senior HR Advisor or similar generalist HR role.
• Experience managing employee relations casework (disciplinary, grievance, absence management, performance).
• Excellent knowledge of UK employment law and HR best practice.
• Experience in corporate, professional services, public sector or large organisations.
• Strong communication and relationship-building skills.
• Strong organisational skills with attention to detail and ability to manage multiple priorities.
• CIPD Level 5 or higher, or working towards it.
• On-site work Monday to Friday with occasional flexible home working.

Responsibilities

• Provide proactive day-to-day HR support to managers across the business, delivering practical people solutions and HR best practice.
• Advise and coach managers on employee relations matters, including disciplinary, grievance, absence, capability and performance.
• Ensure HR policies and procedures are applied in line with UK employment legislation.
• Coordinate and deliver performance management, learning and development, wellbeing initiatives and occupational health processes.
• Produce, maintain and analyse HR reports, KPIs and employee data, ensuring GDPR compliance.
• Support organisational change projects, restructures and continuous improvement initiatives.
• Lead and support talent management, succession planning, engagement, diversity and wellbeing programmes.
• Build strong relationships with managers and stakeholders, providing trusted HR guidance.
• Support HR projects and ongoing policy development.

Skills

Employee relations

Stakeholder management

UK employment law

Communication

Organisational skills

Continuous improvement

Education

CIPD Level 5

Job description

Senior HR Advisor / HR Advisor / Human Resources Advisor / HR Business Partner

Cardiff Full-Time 37.5 Hours per Week Monday to Friday Temporary Contract (Until End of 2026)

Introduction

Acorn by Synergie is recruiting for an experienced Senior HR Advisor to join a leading organisation based in Cardiff.

This is an excellent opportunity for an experienced HR Advisor, Human Resources Advisor, People Advisor, or HR Business Partner to join a well-established corporate organisation on a long-term temporary contract.

Working as part of a professional HR team, you will provide expert advice across the full employee lifecycle, partnering with managers to deliver high‑quality HR support, manage complex employee relations cases, and drive people‑focused initiatives that improve employee engagement and organisational performance.

Key Responsibilities

• Provide proactive day‑to‑day HR support to managers across the business, delivering practical people solutions and HR best practice.

• Advise and coach managers on employee relations matters, including disciplinary, grievance, absence management, capability, and performance issues.

• Ensure HR policies and procedures are applied consistently and in line with UK employment legislation.

• Coordinate and deliver key HR activities, including performance management, learning and development, wellbeing initiatives, and occupational health processes.

• Produce, maintain, and analyse HR reports, KPIs, and employee data, ensuring compliance with GDPR and data protection requirements.

• Support organisational change projects, restructures, and continuous improvement initiatives.

• Lead and support talent management, succession planning, employee engagement, diversity and inclusion, and wellbeing programmes.

• Build strong relationships with managers and stakeholders, providing trusted HR advice and guidance across the organisation.

• Support HR projects and contribute to the ongoing development of HR processes and policies.

Requirements

• Previous experience as a Senior HR Advisor, HR Advisor, Human Resources Advisor, People Advisor, HR Business Partner, or similar generalist HR role.

• Strong experience managing employee relations casework, including disciplinary, grievance, absence management, and performance issues.

• Excellent knowledge of UK employment law and HR best practice.

• Experience working within a corporate, professional services, public sector, or large organisational environment.

• Confident communicator with the ability to build effective working relationships at all levels.

• Strong organisational skills with excellent attention to detail and the ability to manage multiple priorities.

• Proactive approach with a continuous improvement mindset.

• CIPD Level 5 qualification (or above), or working towards this, supported by relevant HR experience.

• Happy to work on-site Monday to Friday, with occasional flexible home working where appropriate.

What’s on Offer

• Full‑time, site‑based role in Cardiff.

• 37.5 hours per week, Monday to Friday.

• Flexible working hours between 8:00am‑9:00am start and 4:00pm‑5:00pm finish.

• Temporary contract expected to run until the end of 2026.

• Opportunity to join a leading organisation within a unique and interesting sector.

• Collaborative HR team with exposure to a broad range of strategic and operational HR activities.

Interested?

If you’re an experienced Senior HR Advisor, HR Advisor, Human Resources Advisor, People Advisor, or Generalist HR Professional looking for your next opportunity in Cardiff, apply today with your up‑to‑date CV.

Acorn by Synergie acts as an employment business for the supply of temporary workers.