Senior Human Resources Generalist

Job Summary

The Senior Human Resources Generalist supports HR Business Partners in delivering a full range of HR services within Masimo’s dynamic environment. This position plays a critical role in executing and enhancing core HR processes across the employee lifecycle, including employee relations, organizational changes, performance management, engagement initiatives, training, and compliance with employment laws.

Acting as a trusted resource to employees and managers, the Senior HR Generalist independently manages employee relations matters and provides guidance on day-to-day HR issues, while partnering closely with HR Business Partners on more complex or strategic initiatives. This role operates with a high level of autonomy within defined scope and serves as a key extension of HR Business Partners in managing day-to-day people matters. 

Please note this is an onsite position at our Irvine, CA. office

Duties & Responsibilities

• Support HR Business Partners in delivering HR services across assigned client groups 
• Serve as a primary point of contact for employees and managers, providing guidance on HR policies, procedures, and day-to-day HR matters 
• Independently manage employee relations matters, including investigations, performance concerns, corrective actions, and involuntary separations; assess risk, recommend appropriate action, and escalate higher-risk situations as appropriate
• Coach and influence managers on employee matters, including performance management, feedback, documentation, and policy application 
• Execute onboarding and offboarding processes, ensuring a compliant, efficient, and positive employee experience
• Manage employee lifecycle changes (e.g., promotions, transfers, organizational updates, compensation changes) with a high level of accuracy and judgment 
• Ensure compliance with federal, state (California), and local employment laws and company policies; independently manage workplace accommodations and the interactive process; proactively identify and escalate potential risks
• Partner cross-functionally with Payroll, Talent Acquisition, Legal, and other teams to ensure aligned and efficient HR operations 
• Support and drive execution of HR programs, including performance management, engagement initiatives, and training efforts 
• Track and analyze trends in employee relations, turnover, and other HR metrics; provide actionable insights and recommendations to HRBPs 
• Identify and lead process improvements to enhance efficiency, scalability, and employee experience 
• Support HR audits, documentation, and maintenance of employee records to ensure compliance 
• Manage unemployment (EDD) claims and workers’ compensation cases, including follow-up and resolution 
• Develop and distribute HR communications, tools, and resources for employees and managers 
• Lead or contribute to HR projects and initiatives, driving execution and outcomes 
• Exercise sound judgment in interpreting policies and making recommendations with minimal oversight

Minimum & Preferred Qualifications and Experience

Minimum Qualifications

• 5–8+ years of progressive Human Resources experience 

• Strong employee relations experience, including independently managing investigations and workplace issues 

• Demonstrated ability to coach and influence managers 

• Solid knowledge of California employment law and HR best practices 

• Ability to operate with a high level of autonomy while effectively partnering with HR Business Partners 

• Strong organizational skills with the ability to manage multiple priorities 

• Strong HRIS proficiency (e.g., Workday, Oracle), including transactions, reporting, data audits, and workforce analytics support.

• Proficiency in Microsoft Office Suite (Excel, Word, Outlook, PowerPoint) 

• Excellent interpersonal and communication skills

Preferred Qualifications:

• Experience in medical device, healthcare, or a regulated industry 

• Experience leading HR projects or process improvement initiatives 

• HR certification (PHR/SPHR or SHRM-CP/SCP)

Education

Bachelor’s degree in Human Resources, Business Administration, or related field required.

Language requirements