developer-apis
(7)
Johan Brissmyr
Johan Brissmyr is the CEO and co-founder of Castle, a security company that helps online businesses detect fraud, bots, and account takeover in real time. A computer scientist from Lund University, he started building web products in Malmo, Sweden before moving to Silicon Valley through Y Combinator and relocating the company to New York. Castle grew out of a password-storage side project that revealed a bigger opportunity in behavioral risk scoring, and today combines device fingerprinting, behavioral signals, and analytics into APIs used by companies of many sizes.
Binkey
Binkey is a Washington, DC fintech that lets online merchants accept pre-tax health benefit dollars - FSA, HSA, and related accounts - as payment at checkout. Its AI-powered engine classifies products at the SKU level to determine IRS eligibility in real time, automates claim filing and reimbursement, and routes funds through developer-friendly APIs. Products span Binkey Pay (checkout acceptance), FSA + HSA Rewind (recovering unused benefit dollars from past purchases), and Binkey Vision (out-of-network vision reimbursement). The company raised $3.3M in seed funding in 2023.
Popcorn
Popcorn is an AI-native, software-first telco that sells a single global phone plan - unlimited talk, text and data across 180+ countries with no roaming fees, delivered over eSIM for about $69 a month. Beyond connectivity, Popcorn layers AI on the line itself: screening calls, taking notes, and defending against deepfakes and SIM-swap fraud, while offering developer SDKs and APIs to add voice, messaging and phone numbers in a few lines of code. Founded in 2023 and based in New York, it argues telecom has barely changed in 25 years and rebuilds it as cloud software.
Superlinked, Inc.
Superlinked is a San Francisco-based infrastructure company building the 'vector computer' - a compute and data engineering framework that turns complex enterprise data into vector embeddings for Search, RAG, Recommendations and Analytics. It now also ships an open-source Inference Engine that lets agent teams self-host every model their agents call, claiming roughly 50x cost savings vs hosted per-token APIs.
Ben Eisenberg
Ben Eisenberg is the CEO of People Data Labs, the B2B data company that supplies the clean, structured person and company datasets behind AI models, recruiting platforms, and sales tools. He joined as a product hire, climbed through senior roles across the business over seven years, and in September 2024 took over from the founders with a mandate to push the company toward $100M ARR. A UC Berkeley computer science and history double major, he is known for a pure data-company philosophy, a compliance-first stance, and a self-deprecating sense of humor (his LinkedIn handle is, proudly, li-influencer).
People Data Labs
People Data Labs is a data-as-a-service company that sells clean, structured B2B data through developer-friendly APIs. Instead of selling dashboards or seats, it sells the raw material - billions of professional and company records that engineers, data scientists, and product teams use to build their own tools for recruiting, sales, marketing, identity verification, and AI. Founded in 2015 and headquartered in San Francisco, the company positions itself as the data layer underneath other companies' products rather than a competitor to them.
Jesse Robbins
Jesse Robbins is General Partner at Heavybit, the San Francisco-based venture firm focused exclusively on developer-first companies. He co-founded Chef (sold to Progress Software for $200M+), invented GameDay chaos engineering at Amazon where he held the title 'Master of Disaster', and co-created the O'Reilly Velocity Conference that seeded the global DevOps movement. A former volunteer firefighter and EMT, he brings a crisis-responder's instincts to early-stage investing, backing companies like Snyk, PagerDuty, Fastly, LaunchDarkly, and Tailscale. His portfolio spans 60+ companies with five IPOs.