Senior People Business Partner

About the role

Antares is developing advanced nuclear microreactors to provide clean energy for terrestrial, underwater, and space applications. We are looking for a Senior People Business Partner to guide our leadership and staff as we scale our operations and maintain a high-performance culture.

Key facts

What you'll do

• Act as a primary advisor to managers regarding employee relations, organizational health, and performance management.
• Design and execute scalable HR policies, compliance practices, and operational workflows.
• Partner with leadership on workforce planning, headcount strategy, and organizational design.
• Coach managers on leadership development, feedback loops, and team dynamics.
• Manage the full employee lifecycle, including promotions, internal mobility, leaves of absence, and offboarding.
• Use workforce metrics and people analytics to identify trends and recommend data-driven improvements.
• Support cross-functional projects alongside Legal, Finance, IT, and Recruiting teams.

Requirements

• Bachelor's degree.
• 5+ years of progressive experience in HR or People Operations within high-growth, high-performance environments.
• Proficiency in employment law and HR best practices, with a focus on California regulations.
• Ability to work extended hours and weekends when necessary to meet company milestones.
• Must meet ITAR requirements: U.S. citizen, lawful permanent resident, refugee, or asylee.

Nice to have

• Experience as an early HR hire at a startup or scaling company.
• Background supporting engineering, manufacturing, or R&D teams.
• Experience managing both exempt and non-exempt employee populations.
• Proficiency with Rippling HRIS.
• Knowledge of employment laws in Washington, Idaho, or South Carolina.
• Experience with compensation planning and performance review cycles.

Skills & tools

• HRIS management
• Employment law compliance
• Organizational design
• Workforce planning
• Performance management
• Employee relations
• Data analytics

Practical notes

This role is based at our 322,000 square foot facility in Torrance, CA. We prioritize in-person collaboration and require 5 days per week on-site. Candidates must be comfortable working in a fast-paced environment that requires flexibility and a hands-on approach to problem-solving.