Demo

Founding Engineer

TechTree
San Francisco, CA Full Time
POSTED ON 11/27/2025
AVAILABLE BEFORE 1/3/2026
About The Company

An innovative company is building the simulation, evaluation, and observability layer for voice and text AI agents. We work with Fortune 500s, multinational corporations, and startups to ensure their AI agents perform as intended. We raised a $4M seed round backed by prominent investors in June — and have doubled our growth every 3 months since inception.

About The Role

Join an innovative company as a full-stack founding engineer to build and QA voice and text AI agents, collaborating with Fortune 500s and startups.

We are seeking Full-Stack Founding engineers to join our innovative company that is building the simulation, evaluation, and observability layer for voice and text AI agents. As part of our team, you will collaborate with some of the largest companies in the world to quality assure their voice and text AI agents. You will work across the stack, take full ownership of your projects, and operate in a small, high-output team.

Responsibilities Include

  • Architecting and developing systems that simulate, analyze, and evaluate conversational AI agents, including voice and multimodal systems.
  • Designing resilient, scalable infrastructure using AWS (Lambda, EC2, WebSockets, SIP) to handle thousands of real-time conversations.
  • Developing algorithms and pipelines that surface insights, detect failure modes, and ensure AI agents are safe, reliable, and aligned with human intent.
  • Working on-site with customers to help build, sell, and deploy the product directly.

We are hiring full-stack engineers who are highly specialized in either frontend or backend, ideally one of each, but both with full-stack experience. This role offers a massive impact opportunity as an early founding engineer, working on cutting-edge voice AI technology at a fast-growing startup. You will have the chance to collaborate with high-profile customers, including leading tech companies and Fortune 50 enterprises.

Requirements

  • Experience with Python, FastAPI, Supabase, and AWS
  • Full-stack experience with a specialty in either frontend or backend
  • 0–3 years of experience
  • Willingness to work ~70 hours per week
  • Strong communication and interpersonal skills

Required Skills

  • React
  • Tailwind
  • TypeScript
  • Next.js
  • Python
  • FastAPI
  • Supabase
  • Redis
  • AWS
  • LiveKit
  • Deepgram
  • Cartesia
  • ElevenLabs
  • Gemini
  • Pydantic AI
  • OpenAI
  • agentic frameworks
  • WebSockets
  • CI/CD expertise
  • communication
  • interpersonal skills

Benefits

  • Competitive compensation and generous equity
  • Heavily discounted housing / room & board option
  • Massive impact opportunity as an early founding engineer
  • Work on cutting-edge voice AI technology at a fast-growing startup
  • Collaborate with high-profile customers including leading tech companies and Fortune 50 enterprises

Salary: 120000 - 170000 USD

Equity: equity, Generous equity as part of the compensation package.

Salary : $120,000 - $170,000

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