Senior Human Resources Manager

io – Software Driven Fabrics to increase GPU cluster utilization
Clockwork Systems was founded by Stanford researchers and veteran systems engineers who share a vision for redefining the foundations of distributed computing. As AI workloads grow increasingly complex, traditional infrastructure struggles to meet the demands of performance, reliability, and precise coordination.

Clockwork is pioneering a software-driven approach to AI fabrics by delivering cross-stack observability to catch and quickly resolve problems, workload fault tolerance to keep jobs running through failures, and performance acceleration that dynamically routes and paces traffic to avoid congestion. io – Software Driven Fabrics to increase GPU cluster utilization
Clockwork Systems was founded by Stanford researchers and veteran systems engineers who share a vision for redefining the foundations of distributed computing.

As AI workloads grow increasingly complex, traditional infrastructure struggles to meet the demands of performance, reliability, and precise coordination. Clockwork is pioneering a software-driven approach to AI fabrics by delivering cross-stack observability to catch and quickly resolve problems, workload fault tolerance to keep jobs running through failures, and performance acceleration that dynamically routes and paces traffic to avoid congestion.

About the Role
As our Senior HR Manager, you'll be the cornerstone of Clockwork's people function. This is a high-impact, hands-on role for someone who thrives in the builder phase: you'll own the full HR lifecycle, elevate our people programs, and serve as a trusted partner to leadership and employees alike.

You'll work closely with our executive team to shape the culture, policies, and infrastructure that will carry us through our next phase of growth — including our teams in the U.What You'll Do
People Operations
Own end-to-end HR operations: onboarding, offboarding, employee lifecycle management, and HRIS administration. Partner with our PEO on payroll, benefits administration, and HR compliance. Serve as the primary point of contact for employee relations, resolving issues with empathy, fairness, and good judgment.

Programs & Policy
Design, implement, and continuously improve HR policies, employee handbooks, and operational processes that scale with the company. Build and deliver onboarding, training, and manager development programs that reinforce our values and accelerate employee effectiveness. Compliance & Legal
Oversee employment-based immigration programs (H-1B, green cards, etc.) in partnership with outside counsel. Proactively identify compliance risks and implement controls before they become problems.

Strategic Partnership
Track and report on people metrics (attrition, engagement, hiring velocity) and surface actionable insights. Support our UK employees with region-appropriate HR programs and compliance requirements.

Contribute to culture-building initiatives, DEI programs, and employee engagement.
8–10+ years of progressive HR experience, with meaningful time in high-growth startup or scale-up environments.
~ Demonstrated ability to build HR programs from scratch — not just maintain existing ones.
~ Hands-on experience with compensation benchmarking, benefits administration, employee relations, performance management, and onboarding.
~ Familiarity with employment-based immigration processes (H-1B, PERM, etc.).
~ Experience working with PEOs and HRIS systems (e.g., Competitive compensation, equity, and benefits.

The chance to shape the HR foundations of a company at an inflection point. Challenging projects. Compensation for this position will vary based on the skills and experience you bring, as well as internal equity considerations. For candidates hired at the posted level, the expected base salary range is $140,000 - $180,000. The offered compensation package may also include stock options or other equity awards, subject to Clockwork's equity program and applicable approvals.

In addition to cash compensation, this role is eligible to participate in the company's equity program, which may include stock options granted in accordance with the company's equity plan and subject to approval and applicable vesting schedules. We are committed to building world-class teams by welcoming bright, passionate individuals from all backgrounds. All qualified applicants will receive consideration for employment without regard to race, color, ancestry, religion, age, sex, sexual orientation, gender identity or expression, national origin, disability, or protected veteran status.

We believe diversity drives innovation, and we grow stronger together.