Founding Engineer | Python / TypeScript | AI Systems | NYC (Onsite)

Sartre Group
New York, US
On-site

Job Description

Role:

Founding Engineer / Member of Technical Staff

Location:

New York City (in-office)

Compensation:

$150k–$250k base + meaningful equity

Stage:

Venture-backed, early-stage AI company

Why this role

  • One of the first engineers in a newly funded AI company
  • Build core systems from scratch, not maintain legacy
  • Work directly with the founder on product and architecture
  • Ship real AI systems used in production from day one

What you’ll be doing

  • Building backend and product systems in a 0→1 environment
  • Integrating LLMs and agents into real workflows
  • Designing systems that handle real-time decisioning and user interaction
  • Shipping quickly in a small, high-ownership team

Tech

  • Python
  • TypeScript / Next.js
  • Cloud (GCP or AWS)
  • LLMs, agents, embeddings

What we’re looking for

  • Strong backend or full-stack engineer
  • Experience building real systems in production
  • Clear, structured thinker who can explain what they’ve built
  • Comfortable in fast-moving, early-stage environments

Ideal background

  • Startup experience or strong product ownership
  • Exposure to AI systems (LLMs, agents, or similar) is a plus
  • Typically early to mid-career engineers who want to move faster and own more

Who this suits

  • Engineers who want

ownership, speed, and impact

  • Prefer small teams over large organisations
  • Want to build from first principles, not iterate on legacy

Compensation

  • $150,000 – $250,000 base
  • Meaningful early-stage equity

Comp reflects early impact and ownership, not just years of experience.

If you are interested in building ambitious AI systems early in a company’s journey and working closely with a founding team, we would be happy to hear from you.

Skills & Requirements

Technical Skills

PythonTypescript / next.jsCloud (gcp or aws)Llms, agents, embeddingsClear thinkingOwnershipImpactAi systems

Salary

$150,000 - $250,000

year

Employment Type

FULL TIME

Level

mid

Posted

4/20/2026

Apply Now

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