Founding Solutions Engineer

Numeral is building the automation backbone for internet commerce — starting with the painful world of sales tax compliance. We handle everything from registration to remittance, delivering a white-glove service so e-commerce businesses can stay laser-focused on what they do best: growing their products, customers, and teams.

We’re one of the fastest-growing companies from Y Combinator’s W23 batch, backed by top-tier investors including Benchmark Capital. Our team has deep roots from the early days at Stripe, Airbnb, Notion, and other breakout companies — and now we’re bringing that same level of craft, speed, and ambition to a space that’s long overdue for reinvention.

Numeral is small but mighty. Growth is already borderline unmanageable — which means every hire we make now will directly shape the trajectory of the company. If you’re excited about joining as an early team member and want the kind of ownership that defines careers, we want to meet you.

Running an online business today means wearing a thousand hats — most of them not the reason founders started their company. Our mission is to eliminate the administrative and accounting burdens that distract businesses from doing what they love.

We’ve already helped hundreds of merchants avoid the headache of building giant finance teams just to manage tax compliance. Tomorrow, we’re scaling that impact even further: building the automation layer that lets internet businesses stay nimble, compliant, and future-proof.

• We’re hiring a Founding Solutions Engineer who thrives at the intersection of software engineering, customer engagement, and product design. You’ll own the full technical sales lifecycle — from designing pre-sales demos to advising on architecture, and all the way through post-sales implementation. This role is ideal for an engineer who loves being customer-facing and wants to build product, not just pitch it. You’ll work cross-functionally with Sales, Engineering, and Product to not only drive customer success, but also directly shape the features we build based on real customer needs. You’ll be our first hire in this function — which means you’ll have significant autonomy, impact, and ownership.

• Partner with Sales to lead technical discovery, run product demos, and scope integrations for prospective customers.

• Own the technical onboarding and implementation process — from solution design to production launch.

• Build and maintain demo environments, proof-of-concepts, and integration documentation to streamline customer onboarding.

• Work directly with Engineering and Product to translate customer requirements into new features and improvements.

• Serve as a trusted advisor to customers on architecture, APIs, and best practices.

• Create internal tools and automations that improve solution delivery.

• Be the voice of the customer — bring learnings back to the product and engineering team to inform roadmap decisions.

• 8+ years of experience as a Software Engineer, Solutions Engineer, or Sales Engineer at a SaaS company.

• Strong coding skills (ideally in Python, JavaScript, or similar) and experience working with APIs.

• Proven experience working directly with customers in a technical capacity.

• Excellent communication skills — ability to explain technical concepts to both technical and non-technical audiences.

• Strong problem-solving mindset and ability to operate in ambiguous, fast-paced environments.

• Experience building or supporting integrations in the fintech or tax compliance space.

• Familiarity with sales tax systems, accounting software, or ERP platforms.

• Prior experience in a startup or early-stage environment.

• Previous work in both pre-sales and post-sales engineering.

• Be a core builder in an ambitious, globally minded startup.

• Learn hands-on how to scale international compliance systems.

• Work across functions and with leadership early in your career.

• Make a visible impact immediately through enablement and operational design.

• Enjoy a flexible, remote-first culture with strong mentorship and ownership opportunities.