Sales Tax Expert

About the role

Firstbase.io is on a mission to build an “All-In-One Company OS” to enable global founders to launch, operate, and grow their businesses using Firstbase’s suite of products.

As a Sales Tax Expert at Firstbase, you will play a key role in delivering a seamless, reliable, and fully managed compliance experience for our clients. Acting as their main point of contact, you’ll guide them through complex state sales tax obligations while our team handles all filings, registrations, and government interactions on their behalf. You’ll collaborate closely with our Sales Tax Specialists, Product, and CX teams to ensure each client is properly onboarded, their tax setup is accurate, and their ongoing needs are met with clarity and speed. You’ll advise on nuanced scenarios like marketplace facilitator rules and changing nexus thresholds, always translating complexity into practical guidance. Your role will also support commercial efforts, helping articulate our value to prospective clients through demos and onboarding conversations.

About Firstbase.io

Firstbase.io is building an all-in-one Company OS to help define how founders across the globe launch, manage, and grow their businesses.

More than twenty thousand founders from over 180 countries have used our incorporation product, Firstbase Start, to launch their startups. For many founders, "firstbase.io" has become what they type into their address bars when considering incorporating a business. 

We are backed by Y Combinator & our team, investors, and advisors include people from Apple, Gusto, Carta, Wise, Plaid, and many other great companies.

Why you should join

Firstbase is much more than just incorporation. Our team is dedicated to building products & solving some of the startups’ hardest problems, with particular focus on:

• Democratizing access to financial infrastructure

• Automating tasks every founder faces when running a business

• Making tools and resources more accessible to everyone, everywhere

• Building integrated solutions for founders and removing friction

• Delivering opportunities to traditionally overlooked founders and companies

• Democratizing access to knowledge

Join us on a mission to help more companies succeed!

Who are we looking for

We are looking for risk-takers with diverse experience who can provide fearless feedback.

You will have the following duties

• Serve as the main point of contact for clients on all sales tax matters — guiding them through obligations and directly managing registrations, filings, notices, and state communications.

• Be the primary liaison to our internal Sales Tax Specialists, who are responsible for onboarding clients and setting up the platform.

• Advise clients on nuanced scenarios such as marketplace facilitator rules, taxability differences by state, or nexus changes — ensuring they understand the implications while we handle execution.

• Respond to client questions and proactively communicate key updates related to filings, payments, and government notices, keeping them informed without burdening them with the details.
  Occasionally support commercial efforts such as product demos or onboarding calls to help prospective or new clients understand our process and value proposition.

You should meet the following requirements

• Solid understanding of U.S. sales tax concepts, including nexus, taxability, registration, and filing requirements across states.

• Experience handling or supporting sales tax compliance for U.S.-based businesses, either in-house, at a consultancy, or through a SaaS platform.

• Strong communication and client-facing skills — able to explain complex tax concepts in simple terms and build trust with a wide range of business profiles.

• Commercial mindset — comfortable interacting with startups, founders, and finance teams to support onboarding and ensure client satisfaction.

• High attention to detail and ability to manage multiple clients and deadlines simultaneously.

• Nice to have: Previous experience in a customer-facing tax advisory, sales tax tech, or fintech/compliance SaaS company.

Some perks you might enjoy

• Competitive salary & equity

We lean on some of the best market data to ensure that we offer the most competitive compensation.

• Hybrid work environment

We work both remotely & from our office in New York City – optimizing for collaboration while providing flexibility to team members.

• 21 days of PTO + birthday off

We offer flexibility to allow people to relax and recharge whenever they need it.

• Build your ideal work setup

We understand that how you work is extremely important, so we provide a stipend to set you up for success here at Firstbase.

• Health benefits

Firstbase offers health insurance reimbursements to both US and international employees

• Learning & development

We provide a stipend together with resources to help people grow and develop in their careers.

• Amazing annual bonuses

Every team at Firstbase has a bonus structure which usually accounts for 10% of OTE.

Even if you don’t check every single box but you’re passionate about the role and want to help build something great, we still want to hear from you. We value diverse experiences, unique perspectives, and people who are driven to make an impact. If that sounds like you, we’d love to meet you.