Executive Assistant

SewerAI Corp; Walnut Creek (CA); Hybrid; USD 90,000 - 100,000; Full time

Benefits offered by this job

Medical coverage

Dental coverage

Vision coverage

Equity

Flexible work

Learning budget

Unlimited PTO

Collaborative team

Job summary

SewerAI Corporation in Walnut Creek, CA is hiring an Executive Assistant to support two co-founders, managing calendars, travel, and day-to-day operations. This hybrid role requires 2 in-office days per week with remote work on other days.

You will handle complex scheduling, travel itineraries, board materials, and liaison with internal teams and external partners. Strong judgment and organizational skills are essential in a fast-paced startup.

Qualifications

• 3+ years of experience as an Executive Assistant supporting C-level or founder-level executives, ideally in a startup or fast-paced environment.
• Excellent judgment with confidential and sensitive information.
• Strong written and verbal communication — comfortable representing the founders in external-facing correspondence.
• Highly organized, detail-oriented, and able to juggle competing priorities without dropping things.

Responsibilities

• Manage complex, frequently-changing calendars for two co-founders, proactively resolving conflicts and prioritizing time against shifting business needs.
• Book and manage domestic and international travel, including itineraries, changes, and day-of issue resolution.
• Coordinate internal and external meetings end-to-end — scheduling, agendas, logistics, room/video setup, and follow-through on action items.
• Coordinate with home managers to flag prioritize and help manage at-home obligations against a very dynamic and demanding work schedule.
• Own light office management for the Walnut Creek office: supplies, vendor relationships, mail, seating/space needs, and general upkeep.
• Serve as a key point of contact between the founders and internal team, external partners, investors, and candidates.
• Prepare and organize materials for board meetings, investor updates, and leadership offsites.
• Handle expense reports and other administrative tasks with discretion and accuracy.
• Anticipate needs before they're asked — flagging conflicts, prepping context, and removing friction from the founders' day-to-day.

Skills

Executive support

Calendar management

Travel coordination

Communication

Tools

Google Workspace

Notion

Expense systems

Job description

SewerAI is on a mission to give infrastructure professionals superhuman capability, and we're looking for exceptional people to help us build it. Join a fast-growing team doing work that protects the underground systems millions of people depend on every day.

SewerAI is a fast-growing infrastructure tech company on a mission to modernize how utilities manage their underground assets. You'll work alongside world-class engineers, data scientists, and sewer industry experts, building software that directly improves the safety and efficiency of critical infrastructure for millions of people.

We believe the best work happens when people are empowered, trusted, and challenged. Our culture is built on transparency, accountability, and a shared passion for impact. We move fast, take ownership, and celebrate wins together.

• Mission-driven: every action improves real infrastructure
• Ownership mentality: we trust you to lead your work
• Transparent by default: open communication at every level
• Diversity of thought: we value different perspectives and backgrounds
• Work-life balance: we work hard and respect your time outside work

RECOGNITION

RECOGNIZED AS A TOP PLACE TO WORK

SPOTLIGHTS

MEET OUR SUPERHUMANS

Sabrina Constance Kall, Senior Software Engineer

“In my time as a software engineer at SewerAI, I've had the joy of working on interesting and varied challenges in a field most people never think about—despite relying on it every day. I've had the privilege of being part of a kind, welcoming team full of people whose incredible skills I learn from daily. And I've experienced the real satisfaction of contributing to solutions that address real-world infrastructure problems, supporting systems that are essential to both public health and the environment.”

Jonathan Dattoma, Account Executive

“I joined SewerAI in August of 2024 to a tiny SDR team of 3 people. Fast forward and the company has doubled size with a robust go to market team. From when I first joined as an SDR to now, managing Go-To-Market for the North East, there wasn’t a time where I felt like the company wasn’t focused on providing the best possible service to its customers - even taking in suggestions from a total newbie like I was. Ultimately, if the idea helps the people who were focused on helping, then it was always worth hearing. The truth is, if you’re a part of the SewerAI team, than you’ve got a voice in helping improve the greatest infrastructure services this century.”

Jonathan Fong, Product Designer

“When I joined SewerAI, the HR team immediately set the tone for the entire company culture. Honestly, in my past roles at bigger companies, HR felt like an invisible force, focused solely on protecting the business and enforcing policies, which made it hard to feel seen as an actual person.My experience here has been the complete opposite. From the start, my expectations for how a company treats its people have been exceeded. Our HR has been the heart of it all, proving that caring deeply and being responsive to the people who make up the company is the main initiative.My positive experience with the culture at SewerAI began with our HR lead and continues to be led by them as I continue my journey and as the company quickly expands!”

Hear from CEO and Co-Founder Billy Gilmartin on what drives SewerAI and the kind of people who thrive here.

One week. The whole team. Our favorite customers. This is SewerAI at its best.

Sales team member Marissa Oudt on building a career with purpose, breaking into male-dominated industries, and why SewerAI is worth betting on.

A love letter to the infrastructure professionals keeping cities moving — and a better way to help them get it done.

PERKS & BENEFITS

WHY YOU'LL LOVE WORKING HERE

• Comprehensive medical, dental, and vision coverage for you and your family.

Equity

• Meaningful equity so you share in the company's long-term success.

Flexible Work

• Remote and Hybrid friendly environment with flexible hours.

Learning & Development

• Annual learning budget for courses, conferences, and professional growth.

Unlimited PTO

• Take the time you need to recharge and bring your best self to work.

Great Team

• Work alongside talented, mission-driven people who genuinely care about impact.

OPEN ROLES

JOIN THE TEAM

Executive Assistant

Location

Employment Type

Location Type

Compensation

• $90K – $100K

About SewerAI Corporation

SewerAI is transforming underground infrastructure management through AI-powered inspection and risk analysis. Our platform helps contractors, engineering firms, and utilities unlock valuable insights from sewer inspection data—turning hours of manual video review into actionable intelligence in minutes. After doubling our customer base over the past year, we’re now entering an exciting phase of accelerated growth.

About the Role

We're hiring an Executive Assistant to support our Co-CEO Co-Founders (2 people) keeping their calendars, travel, and daily operations running smoothly. This role also owns light office management for our Walnut Creek office, making sure the space runs well and the team has what it needs on the days people are in.

This is a hybrid role: 2 scheduled days/week in the Walnut Creek office to handle office management and in-person coordination, with the remaining days remote. Because this role supports two founders directly, some issues — a same-day travel change, a last-minute meeting conflict, an office vendor no-show — won't wait for your next scheduled office day. We're looking for someone comfortable being reachable and responsive on remote days when something time-sensitive comes up, in exchange for the flexibility the rest of the week.

Manage complex, frequently-changing calendars for two co-founders, proactively resolving conflicts and prioritizing time against shifting business needs

Book and manage domestic and international travel, including itineraries, changes, and day-of issue resolution

Coordinate internal and external meetings end-to-end — scheduling, agendas, logistics, room/video setup, and follow-through on action items

Coordinate with home managers to flag prioritize and help manage at-home obligations against a very dynamic and demanding work schedule

Own light office management for the Walnut Creek office: supplies, vendor relationships, mail, seating/space needs, and general upkeep

Serve as a key point of contact between the founders and internal team, external partners, investors, and candidates

Prepare and organize materials for board meetings, investor updates, and leadership offsites

Handle expense reports and other administrative tasks with discretion and accuracy

Anticipate needs before they're asked — flagging conflicts, prepping context, and removing friction from the founders' day-to-day

3+ years of experience as an Executive Assistant supporting C-level or founder-level executives, ideally in a startup or fast-paced environment

Excellent judgment with confidential and sensitive information

Strong written and verbal communication — comfortable representing the founders in external-facing correspondence

Highly organized, detail-oriented, and able to juggle competing priorities without dropping things

Comfortable with ambiguity and last-minute changes; calm under pressure

Based in or near Walnut Creek, CA, and able to be in-office 2 days/week (with occasional flexibility for additional in-person needs)

Experience with tools such as Google Workspace, Notion, calendar/travel management platforms, and expense systems

Prior experience supporting multiple executives simultaneously

Experience in a venture-backed or PE-backed startup environment

Some exposure to office management or facilities coordination

Medical, Dental, Vision, Basic Life, 401(k), and more

Unlimited PTO

Tools and resources to support success

Competitive compensation with high-growth potential

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.

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SewerAI is proud to be an Equal Opportunity Employer. We are committed to providing a workplace free from discrimination or harassment on the basis of age, disability, sex, race, religion or belief, gender reassignment, marriage/civil partnership, pregnancy/maternity, or sexual orientation. All your information will be kept confidential according to EEO guidelines.