HR Manager / Senior Manager, Synchron

• The ideal candidate is a proactive problem solver, highly organized, detail-oriented, and excited to create and execute HR strategies that support our growth from startup to a company of 100+ employees and beyond
• Bachelors degree in Human Resources or related field
• 5+ years of HR experience in a fast-paced, scaling startup environment
• Experience supporting a company as it grew beyond 100 employees
• Able to work onsite in our Brooklyn, NY office
• Strong knowledge of HR processes, compliance, and labor laws
• Hands-on experience with HRIS, payroll, and ATS
• Exceptional organizational skills and meticulous attention to detail
• Ability to handle sensitive information with discretion and confidentiality
• Strong verbal and written communication skills
• A proactive mindset: able to think long-term while executing in the short-term

Desirable

• We are seeking an HR Manager/Sr Manager to be the cornerstone of our growing people function. As the sole HR professional in our organization, you will report to the VP of Finance (who oversees all G&A functions) and have the opportunity to build and shape HR practices from the ground up
• This is a unique chance to play a strategic and operational role in a scaling startup, creating programs and processes that support our engineers, scientists, and broader team while fostering a culture of excellence, innovation, and belonging
• This is not a “back-office” role — you will have a front-row seat to groundbreaking work and the ability to directly shape the employee experience
• Partner with hiring managers to draft and post job descriptions
• Host hiring kickoff meetings with hiring managers and interview teams
• Configure interview phases and plans in our ATS (Greenhouse)
• Conduct phone screenings, cultural interviews, and coordinate candidate feedback
• Manage the offer process and employment documentation
• Act as internal champion and “super user” of Greenhouse
• Serve as onboarding champion: coordinate pre-hire activities, ensure smooth day-one new hire orientation, maintain compliance posters and relevant federal and state trainings, and handle I-9/W-4/all things hiring processes
• Ensure new hires are set up in HRIS, payroll, and benefits systems
• Implement terminations, promotions, and other employee life cycle events (title/department changes, etc.), including documentation and compliance
• Partner with Finance/Accounting to ensure payroll changes (additions, terminations, adjustments) are accurate and timely
• Process payroll with appropriate checks and balances from internal stakeholders
• Ensure compliance with federal, state, and local labor laws (familiarity with CA and NYC labor law is a major plus)
• Maintain HR databases and employee records in compliance with regulations
• Coordinate mandatory trainings (e.g., anti-harassment)
• Design and manage the employee experience program across the full lifecycle
• Lead performance review cycles and coordinate career development discussions with managers
• Partner with leadership to run engagement surveys and implement action plans
• Support implementation of our career track guide and coordinate talent review sessions
• Work with leadership to identify and launch learning & development programs
• Act as in-house benefits point of contact; coordinate with brokers during renewals and support employees with benefits questions
• Administer benefits and payroll programs in alignment with leadership direction
• Provide confidential support on employee relations matters, assisting with investigations and documentation as needed
• Partner with admin team to plan team-building events, company celebrations, town halls, investor visits, and board meetings
• Champion culture and employee experience initiatives, ensuring our values scale alongside our growth