HR Business Partner

Phasecraft Ltd.; Greater London; Hybrid; GBP 70,000 - 90,000; Full time

Benefits offered by this job

Visa support

Job summary

Phasecraft Ltd. is seeking a HR Business Partner to join our leadership team across London and Bristol offices. You will deliver expert people support, drive organisation design, engagement, and development, and partner with founders, managers and staff to scale sustainably.

In this role you will handle employee relations, onboarding, performance processes, compliance, and HR systems (HRIS). You will also manage contracts, visa support with external providers, and work closely with payroll to

Qualifications

• 5+ years HR experience as business partner or HR generalist in deep-tech, R&D, or engineering-led start-up/scale-up.
• Ability to operate independently with sound judgment in ambiguous, complex environments.
• Experience building scalable people processes in a growing company.
• Strong knowledge of UK employment law; exposure to international contexts (US ideal).
• Proven ability to manage employee-relations issues with professionalism and discretion.
• Excellent communication and interpersonal skills; credible, empathetic and commercially minded.

Responsibilities

• Partner with leaders to provide expert HR advice and coaching.
• Embed company values and foster an inclusive, high-performance culture.
• Lead on organisational design and talent reviews as the company scales.
• Design and deliver performance review cycles, goal-setting frameworks, and feedback tools.
• Maintain and update policies and the employee handbook; ensure compliance across jurisdictions.
• Support managers with capability, coaching, and development conversations.
• Manage employment documentation, contracts, and visa support with external providers as needed.
• Work closely with payroll and external providers to ensure accurate people administration.
• Oversee onboarding and induction processes, ensuring consistency across global offices.
• Manage probation processes and provide structured feedback.
• Own employee data accuracy and HR systems (HRIS).

Skills

HR advisory

Stakeholder management

Communication

Discretion

Org design

Education

CIPD qualification or equivalent

Tools

HRIS

ATS

Payroll systems

Job description

Phasecraft is the quantum algorithms company. We are building the mathematical foundations for quantum computing applications that solve real-world problems. Founded in 2019 by Toby Cubitt, Ashley Montanaro, and John Morton, we are based in London and Bristol in the UK and opened an office in Washington DC in 2024, led by Steve Flammia. In 2025 we completed a $34m Series B funding round co-led by Plural, existing investor Playground Global, and Novo Holdings' Quantum Fund in its first direct quantum software investment.

Phasecraft's unprecedented access to today's best quantum computers - through partnerships with Google, IBM, Quantinuum and QuEra - provides us with unique opportunities to develop foundational IP, inform the development of next-generation quantum hardware, and accelerate the commercialisation of high-value breakthroughs.

As we grow, we are committed to maintaining a collaborative, mission driven culture where our people feel supported, developed and inspired. To support this we are looking to hire a HR Business Partner to join our team as a trusted advisor to our founders, managers and staff, delivering outstanding people support while helping us scale effectively and sustainably. The HR Business Partner will balance strategic input such as organisation design, engagement, and development with hands-on execution in areas such as employee relations, performance, onboarding and compliance.

Job Description

• Partner with leaders and managers to provide expert HR advice and coaching.
• Partner with leadership to embed company values and foster an inclusive, high-performance culture.
• Lead on organisational design and talent reviews as the company scales.
• Build trusted relationships across all levels, ensuring employees have a consistent and positive experience.
• Design and deliver performance review cycles, goal-setting frameworks, and feedback tools.
• Maintain and update company policies and the employee handbook; ensure compliance with employment law across multiple jurisdictions.
• Support managers with capability, coaching, and development conversations.
• Manage employment documentation, contracts, and visa support with external providers as needed.
• Work closely with payroll and external providers to ensure accurate and timely people administration.
• Oversee onboarding and induction processes, ensuring consistency across global offices.
• Manage probation processes and support managers in providing structured feedback.
• Own employee data accuracy and HR systems (HRIS).

Essential Criteria

• 5+ years' HR experience, including time as a business partner or HR generalist in a deep-tech, R&D, or engineering-led start-up or scale-up.
• Proven ability to operate independently with excellent judgment and pragmatism in ambiguous, complex environments.
• Experience building scalable people processes in a growing company.
• Strong working knowledge of UK employment law and exposure to international employment contexts (US ideal).
• Proven ability to manage employee-relations issues with professionalism and discretion.
• Excellent communication and interpersonal skills and a track record of being a trusted, credible, empathetic, and commercially minded HR professional.

Desirable Criteria

• Experience implementing or optimising HR systems (HRIS, performance tools, ATS) and building scalable workflows.
• CIPD qualification or equivalent HR certification.

The closing date for applications is 4 October 2026.