Software Engineer, AI

Numeral is hiring a Software Engineer, AI to establish the technical foundations for its AI systems. The role designs, builds, and operates LLM-powered automation, backend services, and integrations, while owning infrastructure and collaborating across product, design, and data teams.

Responsibilities

• Design, build, and operate production AI systems, including tool-calling agents, model orchestration layers, and RAG
• Implement and maintain AI integrations using modern frameworks, MCP servers, and external model providers
• Build and evolve scalable backend services and APIs that power automated workflows and customer-facing features
• Think in automation and workflows: design systems using tools like n8n, Claude Code-style agents, or similar orchestration approaches
• Make architectural decisions that balance latency, cost, reliability, and iteration speed
• Own infrastructure, observability, and performance for both AI and non-AI services
• Collaborate closely with product, design, and data teams to ship features that solve real customer problems
• Help define engineering best practices, AI safety/reliability norms, and our overall technical culture

Preferred

• Experience in payments, tax, accounting, or regulatory tech
• Experience with automation tools (n8n, Zapier-style systems, workflow engines) or building internal automation platforms
• Familiarity with MCPs, tool calls, agent frameworks, or model orchestration patterns
• Understanding of vector databases and concepts (such as Pinecone, HNSW)
• Payments Technology
• Tax Technology
• Accounting Technology
• Regulatory Technology
• n8n
• Zapier
• Workflow Engines
• Internal Automation Platforms
• MCPs
• Tool Calling
• Agent Frameworks
• Model Orchestration
• Vector Databases
• Pinecone
• HNSW

Benefits

• Equity - you'll share directly in the company's success
• Full medical, dental, and vision coverage
• Wellness perks like Headspace and the Peloton One App
• 401(k) to help you build long-term financial security
• Relocation assistance to NYC or SF (if needed)
• Lunch and snacks when you're in the office
• Regular team offsites and company events as we grow
• Hybrid role, 3 days a week in the NYC office

Company

• Automated sales tax and VAT compliance for ecommerce and SaaS.
• San Francisco, California, USA
• https://www.numeral.com/
• Founded in 2022
• 51-200 employees

Qualifications

• 7+ years of experience building products in high-growth environments
• 2+ years of experience building with LLMs
• Avid use of state-of-the-art AI development tools such as Cursor and Claude Code
• Fluency with backend technologies like PostgreSQL, Redis, and cloud services (AWS preferred)
• Experience with frontend development, especially TypeScript and its ecosystem
• Strong product sense, balancing performance, flexibility, and speed
• Comfortable working in dynamic startup environments with evolving needs
• Excellent communication and collaboration skills
• Startup mindset: Not scared of ambiguity and hungry for rapid growth
• Intensity & Ownership: This is not a 9-5 — we're scaling rapidly and have a massive opportunity ahead of us
• Customer Obsession: You deeply care about the user experience and solving their problems
• Experience in payments, tax, accounting, or regulatory tech
• Experience with automation tools (n8n, Zapier-style systems, workflow engines) or building internal automation platforms
• Familiarity with MCPs, tool calls, agent frameworks, or model orchestration patterns
• Understanding of vector databases and concepts (such as Pinecone, HNSW)
• 7+ years of experience building products in high-growth environments.
• 2+ years of experience building with LLMs.

Required skills

• AWS, Accounting, Agent Frameworks, Claude Code, Cursor, HNSW, LLM Development, MCP Integrations, Model Orchestration, Pinecone, PostgreSQL, Redis, Regulatory Technology, Tax Technology, TypeScript, Zapier, n8n

Preferred skills

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

Experience

• 7+ years