Software Engineer (Full-stack, AI Team) at Numeral

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 focused on growing their products, customers, and teams.

Founded by early Stripe employees, backed by Benchmark Capital, and part of Y Combinator's W23 batch, Numeral has raised $57M+, has 2,500+ customers, and has tripled revenue year-over-year.

About the Role

We are hiring a Foundational AI Engineer to join the AI team. You will define the technical and architectural foundations of an early-stage startup building LLM-powered automation systems for an AI-native tax compliance platform.

What You'll Do

Design and deploy production AI systems including tool-calling agents, model orchestration layers, and RAG pipelines.

Implement LLM integrations using modern frameworks, MCP servers, and external model providers.

Build backend services and APIs powering automated workflows.

Make architectural decisions balancing latency, cost, reliability, and iteration speed.

Own infrastructure and observability for AI and non-AI services.

Define engineering best practices and AI safety standards.

Qualifications

7+ years building products in high-growth environments.

2+ years of LLM development experience.

Active use of state-of-the-art AI development tools such as Cursor and Claude Code.

Backend fluency: PostgreSQL, Redis, AWS.

Frontend experience with TypeScript.

Startup mindset and comfort with ambiguity.

Bonus

Experience with fintech or tax systems.

Experience with automation platforms (n8n, Zapier).

Experience with MCP servers and agent frameworks.

Experience with vector databases (Pinecone, HNSW).

Compensation & Location

$175,000 to $300,000 + equity.

New York or San Francisco (hybrid), remote considered in some cases.

Benefits

Competitive equity.

Medical, dental, and vision coverage.

Wellness perks.

401(k).

Office amenities and team events.