Top Tech Startups in California, US in 2027

Alva is your Quantamental Investing AI Agent. Designed to supercharge your investment process, Alva automates the entire research workflow – from initial idea generation and deep data analytics to real-time trend monitoring, robust strategy formation, and thorough backtesting. Built collaboratively with the investment community, for the community, we empower you to build, share, and grow your investment edge together.

UpSunday is a brand, web, software and motion design studio based in San Diego, California, designing and building brands, websites, custom software, and motion and 3D for ambitious companies worldwide. We work as one small, senior team from first idea to launch: brand identity and strategy, websites that load fast and rank, custom software and products, and motion and 3D that make a brand feel alive. Everything is designed and built in house, so what you approve is what ships. We work with founders launching something new and established companies ready for their next chapter, in San Diego and around the world. Our work has been recognized by Awwwards and CSS Design Awards. Great work doesn't wait for Monday.

Callab AI builds AI voice and text agents for enterprise contact centers. We help companies automate customer conversations while keeping the telephony, CRM systems, and workflows they already rely on. Many contact centers run on established on-premises phone systems. Bringing AI to those environments is an infrastructure challenge as much as a modeling challenge. Our SIP-native telephony stack connects directly to systems such as Cisco CUCM, Avaya, and Mitel, so customers can deploy AI agents without replacing their phone infrastructure. Our platform lets teams build agents around their knowledge and business rules, connect them to tools that complete customer tasks, and supervise conversations in real time. When a conversation needs human judgment, a team member can take over with the context preserved. Use cases include customer support, call routing, appointment scheduling, lead qualification, and outbound campaigns. Backed by Y Combinator, We serve customers across three continents and are expanding in the US. Our work spans enterprise software, AI, and the telecom infrastructure that makes reliable customer service possible. We're building the next generation of contact-center automation. Explore our open roles to help bring it to more businesses.

The money layer for agentic economy. AI agents act. Noesia makes them pay. AI agents can research, compare, write code and run entire workflows. Then they stop and ask a human for a credit card. Noesia gives every AI agent a financial identity one authority that decides every transaction across every rail, and adjudicates what happens when it goes wrong

Generate websites, text, images, and videos using the world's best AI models — all in one studio. Or connect smart API with 40+ ai models for your business.