Human Resources - Senior HR Business Partner Job

We are a fast‑paced, high‑growth business development and B2B marketing agency headquartered in the United Kingdom, with expanding teams in the United States and Australia.

We’re looking for a Senior HR professional who can bring structure, clarity, and strategic leadership to our growing team, while thriving in an environment that moves quickly and values initiative. This role is ideal for someone who enjoys supporting ambitious teams and building the HR foundations that enable a modern, global agency to grow sustainably and confidently.

We are looking for an experienced and commercially minded HR Business Partner to join our business on a part‑time basis (2-3 days per week, office‑based in Old Street, London). This is both a strategic and hands-on role for someone who can confidently lead our people agenda, strengthen our culture, and support line managers with expert guidance.

You will be the senior HR voice in the business, ensuring we remain compliant, well‑organised, and equipped to attract, develop, and retain great people.

• Act as the senior HR partner to the leadership team, advising on organisational design, workforce planning, and people strategy.
• Identify HR priorities and implement practical, scalable solutions.
• Support the development of a strong, values‑driven culture.
• Employee Relations & Manager Support:

• Provide expert guidance on performance, conduct, capability, and wellbeing matters.
• Coach managers to build confidence and consistency in people management.
• Handle sensitive or complex employee relations issues with professionalism and discretion.

• Work with our Talent Acquisition Specialist to define recruitment processes, ensuring compliance, high‑quality hiring decisions and a positive candidate experience.
• Develop simple, effective talent and succession planning approaches.
• Manage the contract creation and issuing process for new hires, ensuring accuracy and compliance.
• Lead a smooth onboarding experience, including documentation, induction planning, and probation processes.

• Maintain and improve HR policies, procedures, and documentation.
• Ensure compliance with employment law and best practice.
• Oversee payroll inputs and liaise with external providers.
• Maintain accurate HR records and reporting.

• Shape and support performance management processes.
• Identify training needs and coordinate development initiatives.
• Support company events, recognition programmes, and team‑building activities.
• Help embed company values into everyday behaviours and processes.

Significant HR generalist experience at Senior HR Manager or equivalent level.

Strong understanding of UK employment law and HR best practice.

Experience supporting managers and handling complex employee relations.

Excellent communication, judgement, and relationship‑building skills.

Experience in a small or scaling business is highly desirable.