Software Engineer (Product)

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 looking for a foundational Full-Stack Engineer who thrives in ambiguity, enjoys building complex distributed systems, and wants to define foundational architecture in a fast-growing early-stage startup. You’ll lead the design and implementation of APIs, services, and infrastructure that underpin our platform. You’ll also help drive engineering strategy, product execution, and cultural foundations alongside leadership.

• Design and build scalable, secure backend services and APIs from scratch.

• Make architectural decisions that optimize for speed, data integrity, and long-term maintainability.

• Collaborate closely with product, design, and data teams to develop performant systems that power key customer workflows.

• Own infrastructure, observability, and performance for the services you build.

• Help shape engineering best practices, code quality, and our overall backend culture.

• 7+ years of experience building backend systems in high-growth environments.

• Fluency with backend technologies like Node.js, PostgreSQL, Redis, and cloud services (AWS preferred).

• Experience designing robust APIs and distributed systems at scale.

• Strong product sensibility—able to balance performance, flexibility, and speed.

• Comfortable working in dynamic startup environments with evolving needs.

• Excellent communication and collaboration skills.

• Experience in payments, tax, accounting, or regulatory tech.

• Infrastructure or platform engineering background (e.g., CI/CD, observability).

• Experience scaling monolith-to-service architectures or event-driven systems.

• Familiarity with GraphQL, Kafka, Terraform, or container orchestration tools.

• 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 culture with strong mentorship and ownership opportunities.