Founding Software Engineer

Career Renew
San Francisco, California, United StatesFull-time$200,000–$225,000Posted Sep 18, 2026

About the role

Career Renew is recruiting for one of its clients a Founding Software Engineer - this is an onsite role in San Francisco. Salary range: 200-225K USD base plus benefits plus equity.

We are looking for a Founding Software Engineer with 0-8 years of experience to join our founding team and help build AI systems that control enterprise spend at scale. You'll work alongside former early leaders at Zip ($2.2B procure-tech startup) to solve complex data problems for F500 customers: think dirty data, massive volume, and real bottom-line impact. This is not a flashy consumer AI play; it's a deeply technical, enterprise-grade challenge backed by $5M from 8VC and Jeff Lawson (Twilio founder). If you want to found a company in the future, this is the perfect training ground.

What will you be doing?

Building and shipping full-stack product features end-to-end as a core member of the founding engineering team

Solving hard data problems at scale: continuously verifying what enterprises have negotiated vs. what they've paid across massive volumes of dirty data

Making strategic product and technical decisions that shape the company's direction from day one

Working directly with enterprise customers (F500s in CPG, retail, healthcare) to understand their problems and deliver solutions

Contributing to AI/LLM systems that drive millions in savings for the world's largest organizations

Requirements:

Impressive,​ relevant work history at top-​tier companies:​ FAANG,​ brand-​name tech (Airbnb,​ Figma,​ Datadog-​tier),​ or Series A/B+ startups backed by reputable VCs

Excited about working in a deep enterprise B2B / procurement space:​ solving dirty data problems at massive scale for F500s

0 -​ 8 years of experience in full-​stack software engineering

Full-​stack,​ front-​end,​ or back-​end product engineering experience shipping real products (leaning either direction is fine)

Top CS program required for new grads

Full-​stack application development (shipped real products end to end)

Nice-to-have:

Former founder or founding engineer at a reputable,​ VC-​backed startup (highest-​caliber profile)

Experience with modern LLM systems,​ evals,​ or frameworks

Enjoys talking to and helping enterprise customers

Culture fit with a 25-28 year old founding team (early-​career,​ high energy,​ wants to build 0-​1)

Responsibilities

  • Building and shipping full-stack product features end-to-end as a core member of the founding engineering team
  • Solving hard data problems at scale: continuously verifying what enterprises have negotiated vs. what they've paid across massive volumes of dirty data
  • Making strategic product and technical decisions that shape the company's direction from day one
  • Working directly with enterprise customers (F500s in CPG, retail, healthcare) to understand their problems and deliver solutions
  • Contributing to AI/LLM systems that drive millions in savings for the world's largest organizations

Qualifications

  • Impressive, relevant work history at top-tier companies: FAANG, brand-name tech or Series A/B+ startups backed by reputable VCs
  • Excited about working in a deep enterprise B2B / procurement space: solving dirty data problems at massive scale for F500s
  • 0 - 8 years of experience in full-stack software engineering
  • Full-stack, front-end, or back-end product engineering experience shipping real products
  • Top CS program required for new grads
  • Full-stack application development (shipped real products end to end)

Benefits

  • Benefits
  • Equity

Skills mentioned

Frontend DevelopmentBackend DevelopmentSystem DesignDistributed SystemsSQLData EngineeringData PipelinesGenerative AILarge Language ModelsModel Evaluation

About Career Renew

Career Renew aims to transform the job search process by making it easier for candidates

Business Consulting and Services2-10 employeesBucharest