# Founding Engineer - Fullstack
**Company:** [DiligenceSquared](https://hotfix.jobs/companies/diligencesquared)
**Location:** New York, NY
**Salary:** $120K-$200K
**Experience:** 3+ years
**Skills:** React, TypeScript, Python, Postgres, SQL, LLMs, OpenAI, Anthropic, Next.js, FastAPI, Supabase
**Posted:** 2025-12-10
> 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.
## Job Description
## 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.
**Apply:** https://hotfix.jobs/jobs/founding-engineer-fullstack-at-diligencesquared-864585b3-09bc-4dc2-b2f7-9e41203e7a29
**Canonical:** https://hotfix.jobs/jobs/founding-engineer-fullstack-at-diligencesquared-864585b3-09bc-4dc2-b2f7-9e41203e7a29