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DiligenceSquaredDiligenceSquaredNew York, NY

Founding Engineer - Fullstack

Founding fullstack engineer building end-to-end AI-powered features for a commercial due diligence platform used by PE funds, including backend agentic systems, voice AI, and interactive UIs. Requires 3+ years experience with React/TypeScript, Python, production LLMs, and SQL databases.

120k – 200k/yr
On-site3+ YOEFullstack Engineering

About the role

Responsibilities

  • Build new product features and experiences end-to-end, from database models to API endpoints, integrating with UI components for Web App and AI Voice Agent.
  • Design and build new AI-powered modules (e.g., market sizing, competitive analysis) for the research platform.
  • Build and own product foundations across the stack (AI agent orchestration, voice AI pipelines, interactive data visualization, app/API performance, intelligent automations).
  • Apply learnings from projects to continuously improve the product.

Qualifications

  • 3+ years of professional full-stack development experience.
  • Strong proficiency in React/TypeScript and Python.
  • Experience building agentic systems with LLM platforms (Anthropic, OpenAI, or similar).
  • Deep hands-on experience with LLMs in production (reliable agentic systems).
  • Experience with PostgreSQL and SQL database design.
  • Experience with modern frontend architecture, state management, and API design.
  • Track record of shipping user-facing products end-to-end.

Bonus

  • Experience with Next.js and FastAPI.
  • Experience with Anthropic Claude API and Agent SDK.
  • Familiarity with agent orchestration frameworks.
  • Background building interfaces for AI/ML products or data-intensive applications.
  • Familiarity with vector databases and semantic search.
  • Experience with Supabase.
  • Previous startup experience.

Skills

ReactTypeScriptPythonPostgresSQLLLMsOpenAIAnthropicNext.jsFastAPISupabase

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