HR Partner

Greenjets Limited; Milton Keynes; On-site; GBP 50,000 - GBP 70,000; Full time

Job summary

A clean aviation technology firm is looking for an HR Partner to oversee core HR operations and employee relations. This role involves establishing robust HR policies and leading performance cycles in a growing startup environment. The ideal candidate will bring significant experience in HR management and should have a CIPD L5 qualification. The position requires a strong focus on building effective HR infrastructure and ensuring operational excellence within the team.

Qualifications

• Strong experience owning HR operations in a scaling business (startup or high-growth environment).
• Deep confidence handling employee relations and advising managers through complex situations.
• Proven ability to build and improve HR infrastructure.

Responsibilities

• Own core HR operations and employee relations in a high-growth environment.
• Establish and maintain HR policies, procedures, and contracts.
• Lead the delivery of performance and appraisal cycles.

Skills

Handling employee relations

Developing HR policies

Implementing HRIS/ATS systems

Delivering structured People programmes

Operational management

Education

CIPD L5 qualification

Job description

About Us

Greenjets is building the next generation of clean aviation technology. We are an early-stage, venture-backed technology company developing complex hardware and software systems with the ambition to transform a high-impact sector. As we scale, we are strengthening our People Team to support rapid growth, capital efficiency, and operational excellence.

About the Job

The HR Partner will be the day-to-day owner of core HR operations, acting as the main accountable person for employee relations, policy governance, and delivery of key People programmes.

Reporting to the HR & Talent Manager, you will sit within an evolving team of three (with an additional HR & Talent Administrator planned). While the HR & Talent Manager holds overall responsibility for the function, strategy and budget, this role will own the operational HR engine that supports managers and employees daily.

We are happy to consider part-time and other flexible working arrangements (condensed, modified working hours etc...), but the successful applicant needs to be on-site 3 days per week.

Key Outcomes in the First 6–12 Months

Employee Relations Ownership

• Become the primary point of accountability for ER cases, ensuring issues are handled fairly, consistently, and in line with company values and legal standards.

Policy & Contract Framework

• Establish a robust, up-to-date suite of HR policies, procedures, and employment contracts that scale with the organisation.

HR Infrastructure Delivery

• Play a contributory role in the migration, implementation, and upkeep of People systems, including HRIS and ATS infrastructure, enabling operational excellence across the employee lifecycle (ATS + HRIS as core infrastructure).

Aligned to Greenjets People systems strategy covering HRIS documentation, policies, payroll and operational workflows.

Levelling & Career Framework Rollout

• Key contributor to creating a full levelling programme, developing the framework and successfully levelling all employees across the organisation.

Performance & Appraisal Cycle Delivery

• Joint-lead for the delivery of the 360 appraisal cycle, ensuring it is embedded directly into the levelling framework and supports consistent development and progression.

Desirable Qualifications, Experience & Attributes

To Succeed in This Role, You’ll Likely Bring:

• Strong experience owning HR operations in a scaling business (startup or high-growth environment).
• Deep confidence handling employee relations and advising managers through complex situations.
• Proven ability to build, improve and operationalise policies and HR infrastructure.
• Experience implementing HRIS/ATS systems or delivering process migration projects.
• Track record delivering structured People programmes (performance cycles, levelling, career frameworks).
• A delivery-focused mindset — you enjoy building systems that last, not just maintaining them.
• CIPD L5 qualification