# Founding Engineer - Fullstack

**Company:** [DiligenceSquared](https://hotfix.jobs/companies/diligencesquared)
**Location:** New York, NY
**Role:** Fullstack Engineering
**Salary:** $120k – $200k/yr
**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.

## Similar roles

- [Full Stack Engineer](https://hotfix.jobs/jobs/ed62e574-fd84-4844-bdf0-e82fb36c467f) - Quindar - Arvada, CO - $120k – $180k/yr
- [Fullstack Engineer](https://hotfix.jobs/jobs/3ed82dcd-442b-4ef5-9c61-32e583fbb443) - Lightning AI - Remote - $120k – $250k/yr
- [Founding Product Engineer](https://hotfix.jobs/jobs/81aa304c-13d5-4152-81b5-0b6f837abcb7) - Bild AI - San Francisco, CA - $120k – $180k/yr
- [Forward Deployed Engineer](https://hotfix.jobs/jobs/7448225d-4669-4c40-b527-f7107e3edc4c) - HappyRobot - San Francisco, CA - $120k – $200k/yr
- [Full-Stack Software Engineer](https://hotfix.jobs/jobs/66ae5156-e6f1-4f4d-b981-05407b1d3284) - Spruce ID - Remote - $120k – $200k/yr

**Apply:** https://hotfix.jobs/jobs/864585b3-09bc-4dc2-b2f7-9e41203e7a29
**Canonical:** https://hotfix.jobs/jobs/864585b3-09bc-4dc2-b2f7-9e41203e7a29