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$917.80M Raised in 38 Funding Rounds in the past 7 Days - View All

Funding Round Profile

Span(US)

start up
United States - San Francisco
  • 18/11/2025
  • Seed
  • $25,000,000

Span is the AI-native developer intelligence platform that helps software engineering leaders cut coordination costs and drive performance at scale.

Span brings clarity to engineering organizations with a holistic, human-centered approach to developer productivity. World-class companies like Ramp, Vanta, Carvana, Writer, and Braze use Span to get a complete picture of engineering impact and health, drive high performance, and make smarter business decisions.

We recently launched an AI Code Detector. It's powered by span-detect-1, a state-of-the-art machine learning model for chunk-level detection of AI generated code at 95% accuracy. The model ties AI coding assistants to code shipped into production for the first time, creating clearer visibility into adoption, impact, and ROI.

Span is backed by Alt Capital, Craft Ventures, SV Angel, Bling, BoxGroup, and dozens of founders, CTOs and CPOs at places like Slack, Notion, Rippling, and Square.


Related People

J Zac SteinCo Founder

J Zac Stein United States - San Francisco, California

Span is a passion project, it's the tool we wish we'd had in previous roles - one that automates away busywork, improves decisionmaking, and helps fight against the forces that make R&D teams slow as they grow. We're growing quickly and we're hiring; if you’re interested in joining us, please shoot a brief note to careers@span.app

Most recently, I spent five years at Lattice before transitioning into an advisory role. Lattice helps companies align, engage and grow their employees. As COO, I supported our business teams – sales, marketing, customer experience, analytics, operations, finance and HR. As President & CPO, I supported our engineering, product and design organizations. During my tenure, we grew from 1M to >100M in ARR, 28M to 3B valuation, >60 NPS, >120% NDR, burn multiple <1.25 and earned Best Place to Work awards by Fortune and Glassdoor. I’ve also had the pleasure of serving as an angel and/or advisor to 40 startups, four of which have gone on to become unicorns with several others on their way.

Prior to Lattice, I was GM and VP at Zenefits, where I built, launched and scaled the payroll business before leading company operations. I had previously co-founded and led Ceiba College Prep, a nonprofit public charter school that prepares historically under-resourced students for success in college and life.

Technology is once again magic. While I have experience directly managing large (500+) person teams across GTM, EPD, as well as G&A, I've always felt most fulfilled when making new and impactful things with people that I enjoy and admire. Come join us!