Top Tech Startups in California, US in 2027

Compute is a commodity. We think people should buy it like one. Startups shouldn’t be forced to buy a year’s worth of compute time in order to get market rate and compute providers shouldn’t go bankrupt because they can’t fully book their clusters. At SF Compute , our goal is to solve this issue the same way this was solved for every other commodity — by building a venue where compute contracts are traded in real-time and by bringing a new kind of participant into the supply chain, traders. If we succeed, buyers will be able to get a good price for any order, whether it’s 32 H100s for a month or 8,000 H100s for an hour, and sellers will instantly book out their clusters because traders will speculatively buy them, for a spread. Every FLOP will flow through us somewhere in the supply chain. What Brent is for oil, we will be for compute.

Assured QA is an enterprise-grade automated software testing infrastructure designed to eliminate bottlenecks in modern development cycles. Legacy QA pipelines slow down deployment, drain engineering resources, and break under scale. We solve this by providing a robust, self-serve automated testing machine that integrates directly into enterprise workflows, allowing engineering teams to ship code faster with absolute confidence. We are an engineering-led startup. We have successfully built, launched, and bootstrapped version 1 of our architecture to active revenue, achieving definitive market validation. We are currently scaling our proprietary version 2 infrastructure to handle complex, high-velocity enterprise demands. Our foundation is rooted in deep systems architecture, autonomous execution, and solving the hardest infrastructure problems in the developer tools space.

CommodityAI builds software and AI agents for physical commodity trading—the industry that moves the world's energy, metals, and agricultural products. Behind every trade and shipment, teams coordinate contracts, documents, logistics, and payments across emails, spreadsheets, and existing systems. We turn that scattered information into reliable workflows, helping commercial, logistics, and finance teams keep records in sync, handle routine work, and focus on exceptions that need their judgment. Our agents work with real operational data and tools to support execution across the trade lifecycle. The engineering challenge is making them useful and dependable: connecting complex systems, handling messy inputs, evaluating behavior, and knowing when to bring a person into the loop. We are a Y Combinator W24 company based in San Francisco. We recently raised our Series A and are growing our engineering team. Engineers work closely with the founders and customers, own meaningful parts of the product from idea through production, and see their work used in real operations. We're building a team that values ownership, practical technical judgment, and clear communication. If you enjoy turning ambiguous problems into software people rely on, we'd like to meet you.

SkyAccess is a US-based private jet marketplace for empty leg flights: private jets repositioning without passengers, which usually sell 25 to 75% below a comparable full charter. SkyAccess is the world's largest empty leg marketplace by listing volume, with 5,000+ live empty leg flights from 900+ FAA Part 135 (and international equivalent) certified charter operators across North America, Latin America, Europe, the Caribbean and beyond. Travelers search and book empty leg flights directly on SkyAccess, with no membership required. Prices are for the whole aircraft, and taxes and fees are shown at checkout. Popular routes connect New York, Miami, Los Angeles, Dallas, Scottsdale and Las Vegas, plus international flights to Mexico, the Bahamas, Canada and Europe, with new empty legs added throughout the day.

The global economy doesn’t move people, goods, nor services without the 100M fleet vehicles on the road. At the center of every fleet, is the fleet manager. They’re responsible for evaluating data and making decisions on purchasing, maintaining, training, reporting, and upselling. Yet a majority of these managers still rely on Outlook and Excel to get their job done. Colin, Drake, and Jamie are the co-founders of Proaction, a growing B2B SaaS startup with one mission: make fleet management simple. We leverage AI to rapidly deploy software that fits our fleet managers’ day-day like a glove.

HackerRank provides a platform that helps companies to evaluate technical skills and create opportunities. The company helps in hiring skilled developers by allowing tech recruiters and hiring managers to evaluate talent at every stage of the recruiting process.

We are building some cool stuff using AI that will help anyone prepare for interviews more efficiently