Founding Full Stack Engineer

NxT Level; New York (NY); On-site; USD 140,000 - 200,000; Full time

Benefits offered by this job

Meaningful equity

Founding-level impact

Immediate customer exposure

Small team autonomy

Job summary

NxT Level is looking for a Founding Product Engineer for a seed-stage B2B SaaS startup in New York City. This role involves building and shipping full-stack features with a focus on React/TypeScript and Python, and offers a chance to shape the product and company direction. Candidates should have 4-8 years of experience, possess strong full-stack development skills, and be excited to work in-person in NYC. Competitive compensation includes a base salary of $140k–$200k and above-market equity.

Qualifications

• 4–8 years of professional software engineering experience.
• Strong full-stack capability (React/TypeScript + Python).
• Comfort operating in ambiguity and early-stage environments.

Responsibilities

• Build and ship full-stack product features used by real customers.
• Translate customer pain into shipped functionality, fast.
• Make pragmatic technical decisions that balance speed with scale.

Skills

Full-stack development

React/TypeScript

Python

Clear communication

High agency

Comfort with ambiguity

Job description

Founding Product Engineer (Client Search) | AI + B2B SaaS | NYC (In-Person)

We’re partnering with a seed-stage B2B SaaS startup building AI-powered sales software for the $9T chemicals industry, an industry still operating on PDFs, spreadsheets, and tribal knowledge.

Our client is tackling the “needle-in-a-haystack” problem for technical sales teams by combining deep domain expertise with AI agents. They have early customer traction, strong investor backing, and are now building their founding engineering team.

This is a confidential search for one of their earliest product engineers.

The Role

This is a founding-level Product Engineer role...high ownership, high trust, real influence.

You’ll work directly with the founders and customers to build the core product from the ground up, shaping not just features, but architecture, workflows, and engineering culture.

If you enjoy zero-to-one work, shipping quickly, and owning outcomes end-to-end, this role was designed for you.

What You’ll Do

• Build and ship full-stack product features used by real customers
  (React / TypeScript frontend, Python backend)

• Translate customer pain into shipped functionality, fast

• Make pragmatic technical decisions that balance speed with scale

• Influence product direction, engineering standards, and team culture

• Operate effectively without heavy process or rigid specs

What Our Client Is Looking For

• 4–8 years of professional software engineering experience

• Strong full-stack capability (React/TypeScript + Python)

• High agency: you unblock yourself, move fast, and take ownership

• Comfort operating in ambiguity and early-stage environments

• Clear communicator who enjoys working directly with customers

• Excited to work in-person in NYC (4–5 days/week)

Nice to Have

• Experience with LLMs, AI agents, or modern AI tooling

• Background building data-heavy or workflow-driven applications

• Previous startup or founding-team experience

Why This Opportunity

• Founding-level impact: your work will shape the product and company

• Immediate customer exposure: what you build gets used right away

• Meaningful equity: above-market equity for early builders

• Small, sharp team: autonomy, trust, and speed over bureaucracy

Compensation

$140k–$200k base
Generous, above-market equity

Interested?
Apply here or message us directly to learn more about the client, team, and opportunity.