Numeral is transforming how taxes get done. Digital businesses are currently bogged down by a painful web of regulations across 47 states and 70+ countries. We’re eliminating this burden so teams can focus on their core mission.
We’re the largest and fastest-growing AI-native tax solution. Started in 2023, Numeral has raised over $57M from Benchmark, Mayfield, Y-Combinator, and many others. We now serve over 3,000 paying customers and have more than tripled our revenue every year in our history.
About the role:
We’re looking for a Foundational AI Engineer who thrives in ambiguity, enjoys building real-world AI systems end-to-end, and wants to define the technical and architectural foundations of an early-stage startup.
This is a hands-on role for someone who wants to design and implement LLM-powered automation systems: model orchestration, tool calling, MCP-style integrations, agentic workflows, and automation-driven tooling.
What you’ll do:
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Design, build, and operate production AI systems, including tool-calling agents, model orchestration layers, and RAG.
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Implement and maintain AI integrations using modern frameworks, MCP servers, and external model providers.
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Build and evolve scalable backend services and APIs that power automated workflows and customer-facing features.
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Think in automation and workflows: design systems using tools like n8n, Claude Code-style agents, or similar orchestration approaches.
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Make architectural decisions that balance latency, cost, reliability, and iteration speed.
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Own infrastructure, observability, and performance for both AI and non-AI services.
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Collaborate closely with product, design, and data teams to ship features that solve real customer problems.
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Help define engineering best practices, AI safety/reliability norms, and our overall technical culture.
What you’ll bring:
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7+ years of experience building products in high-growth environments.
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2+ years of experience building with LLMs.
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Avid use of state-of-the-art AI development tools such as Cursor and Claude Code.
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Fluency with backend technologies like PostgreSQL, Redis, and cloud services (AWS preferred).
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Experience with frontend development, especially TypeScript and its ecosystem.
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Strong product sense, balancing performance, flexibility, and speed.
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Comfortable working in dynamic startup environments with evolving needs.
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Excellent communication and collaboration skills.
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Startup mindset: Not scared of ambiguity and hungry for rapid growth
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Intensity & Ownership: This is not a 9-5 — we’re scaling rapidly and have a massive opportunity ahead of us.
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Customer Obsession: You deeply care about the user experience and solving their problems
Even better:
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Experience in payments, tax, accounting, or regulatory tech.
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Experience with automation tools (n8n, Zapier-style systems, workflow engines) or building internal automation platforms.
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Familiarity with MCPs, tool calls, agent frameworks, or model orchestration patterns.
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Understanding of vector databases and concepts (such as Pinecone, HNSW).
What we offer:
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Competitive salary and equity - you’ll share directly in the company’s success
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Full medical, dental, and vision coverage
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Wellness perks like Headspace and the Peloton One App
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401(k) to help you build long-term financial security
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Lunch and snacks when you’re in the office
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Regular team offsites and company events as we grow
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A culture built on ownership - your work matters and people will see it!