HR Generalist

About the role

SewerAI is hiring an HR Generalist to help scale our People function and support an exceptional employee experience as the company continues to grow past 100 employees. This role adds dedicated, experienced capacity across People Operations, HR administration, the employee lifecycle, and HR compliance.

What You'll Do

• Core HR & People Operations Support day-to-day HR activities across the full employee lifecycle.
  • Administer benefits, 401(k), and leave programs — processing, changes, and audits — and serve as a first point of contact for employee questions.
  • Partner with the Head of People on benefits renewals and Open Enrollment, including employee communications, coordination, and enrollment support.
  • Care for payroll inputs and changes in partnership with Finance, ensuring accuracy and timeliness.
  • Own HRIS data integrity — records, reporting, and system hygiene — and generate People reports and dashboards for leadership.
  • Carefully maintain headcount data in Rippling, keeping records current and reporting-ready, and ensure employee data accuracy across People systems such as Rippling and Carta.
  • Care for offboarding logistics and equipment returns.
  • Support HR compliance initiatives, audits, and documentation across applicable federal and California requirements.
  • Maintain People policies, documentation, and internal People resources, and support and maintain the People intranet workspace in Notion.
• People Programs & Employee Experience
  • Administer engagement and pulse surveys and prepare clear reporting on the results.
  • Support the company's 360 performance review program, including coordination, communications, tracking participation, and supporting leaders through the review cycle.
  • Aid in training managers on HR procedures, policies, and People processes to ensure consistent and compliant practices across the organization.
  • Create and distribute a monthly internal employee newsletter and support company-wide communications related to People programs and initiatives.
  • Supply day-to-day employee relations support and escalate sensitive matters to the Head of People with sound judgment.
  • Support employee engagement activities, internal People programs, onsites, offsites, and company travel logistics.
  • Partner with Recruiting on joint initiatives such as employer branding, candidate experience, and hiring events.

Who You Are

• 5 years of hands-on HR experience, as a generalist or in a specialty area (e.g., benefits, HRIS, compliance, or employee relations).
• Comfortable owning HRIS, payroll coordination, and benefits/401(k) administration.
• Technology savvy and comfortable across multiple systems — experience with Rippling, Carta, Notion, and Google Workspace (Docs, Sheets, Slides, Drive, Calendar), or the ability to quickly become proficient.
• Makes effective use of HR and AI tools (e.g., Notion, HRIS, and AI assistants) to work more efficiently and improve People processes.
• Highly organized, detail-oriented, and execution-focused, with a self-starter mindset and strong bias toward action.
• Comfortable in a fast-paced startup environment where priorities move quickly and there is always something to build, improve, or solve.
• Strong judgment and discretion with confidential and sensitive information.
• Able to be in the office at least 2 days per week and reside within a 40-mile radius of Walnut Creek, CA.

Growth Opportunity

This role is designed as a pipeline into a more senior HR position. As SewerAI grows, it will take on deeper ownership across benefits and compliance strategy, policy administration, employee relations, People program design, and cross-functional partnership with Finance, Recruiting, and leadership.

Compensation & Benefits

• Competitive salary ($108,000–$115,000 base, commensurate with experience).
• Full benefits package.
• Hybrid schedule based in Walnut Creek, CA.
• High-growth environment with real advancement opportunity.
• The chance to help shape People Operations at a fast-growing company.

Why Join SewerAI?

Join the fastest-growing team in wastewater tech and help modernize critical infrastructure with AI. You’ll own high-visibility projects, influence how our brand meets the market, and see your work drive measurable impact for customers and communities.