Top Tech Startups in California, US in 2026

Earthinia is building an AI workforce platform designed to help businesses automate and coordinate real operational work through specialized AI roles. Our platform enables organizations to create **Clusters** that represent their businesses or operational environments and deploy specialized **Instances** for functions such as management, sales, marketing, finance, customer support, human resources, operations, analytics, and other business activities. Each AI instance can be configured with the tools, permissions, knowledge, models, and integrations required for its responsibility. Instances can work independently or collaborate within a cluster to handle multi-step business workflows. Through the Earthinia Console, API, SDKs, and communication-channel integrations, businesses can connect their AI workforce to websites, internal systems, data sources, and customer communication platforms. Earthinia does not require companies to build their own AI infrastructure or AI engineering teams. We provide the orchestration, execution, security controls, integrations, and management layer needed to turn modern AI models into practical business capabilities. Our mission is to make intelligent automation accessible to businesses of every size by allowing them to build, manage, and scale AI-powered operations from one platform. We envision a future where people and AI systems work together across organizations, enabling businesses to operate more efficiently, respond faster, and focus human talent on the work that requires creativity, judgment, leadership, and innovation.

Realm is building the modern financial advisor for your house. Primary residences account for 62% of the average American’s total assets, but there’s no accessible platform homeowners can turn to for unbiased, actionable advice — until now. From the day you buy your home to the day you sell it, you’re making a series of expensive and confusing decisions. To navigate these decisions, homeowners try to cobble together information from biased experts, googling, and friends. Realm's free insights and tools help homeowners across the US make informed decisions. Our nationwide product is powered by technology, with a human touch. Our insights help homeowners navigate complex & expensive home decisions, ranging from how much to spend on a kitchen renovation to when to refinance.

Lunar is a stealth hospital technology company building a new type of software platform for hospitals. Built on a foundation of two years of research and development, the Lunar cloud platform brings state-of-the-art technology to solve some of the most frustrating challenges faced by hospitals today. The company focuses on using smarter automation, better data, and sensible machine learning to empower hospitals with the tools to provide more precise and effective care, doing things they can't today. This next-generation platform is a fundamental rebuild of the information infrastructure that runs health systems. All of it – from doctors, nurses, pharmacists, lab technicians, coders, billers, supply chain, and even patients – Lunar’s software powers everything, soup-to-nuts. We believe that this mission is the moon landing of healthcare – something so consequential and ambitious that most people believe it to be impossible. Backed by Silicon Valley’s preeminent venture capital firms, we believe in the power of a small, high performance team of seasoned professionals operating at the peak of their abilities. We value people who are driven, curious, have sound judgement, and care about doing the best work of their careers.

Hiring has a trust problem. Fake candidates, stolen identities, proxy interviewers and AI-fed answers are now common enough that most teams have met one without knowing it. A resume is easy to fake. An interview is easy to outsource. By the time it surfaces, the cost has already landed on the team. Aperture is the human intelligence platform. We make sure the person you hire is the person who interviewed. We bring identity verification, candidate fraud detection, background verification and threat intelligence together with adaptive AI interviews and λ-CORE, our candidate evaluation engine, so hiring teams can see who is real and who is actually good long before a final round.

Metriport is an open-source platform that makes it easy for healthcare organizations to access and exchange medical data for their patients.

Behind every opportunity is someone who introduced you. The investor who funded your company. The customer who changed its trajectory. The person who introduced you to your co-founder, next hire, mentor, or partner. Yet our professional networks have never been larger, and we still struggle to answer a simple question: Who should I know? Introd helps you discover the people you should know, understand how you're connected, and find the right path to an introduction. We’re building the relationship layer for opportunity: intelligence that turns fragmented professional networks into an understanding of who knows whom, which relationships actually matter, and where the strongest opportunities exist. Underneath Introd is a relationship graph that brings together signals across the places professional relationships already live. AI and graph intelligence help identify relevant people, understand relationship strength, rank connection paths, and surface opportunities that would otherwise remain hidden. For a founder, that might mean discovering the right investor or customer. For an investor, the right founder. For an executive, a strategic partner or key hire. For a community, it means turning hundreds or thousands of members into relationships that actually create value. We don't believe the future of professional networking is another feed, another directory, or collecting more connections. It's knowing the right people at the right moment. That’s what we’re building. The right people. Stronger relationships. Real opportunities. You’re one introduction away.

Green is building a global consumer neobank. We're merging international banking and payments into a single product. Our mission is to enable all of our customers around the world to spend, save and earn in USD. We'll be starting the US and select international markets with ambitions to scale far beyond. Green is built by a small group of highly experienced operators and engineers. We're a small, senior-only team, with no layers, politics, or slow decisions. We've built, founded, and owned services used by hundreds of millions of people and generating billions in revenue. Green is the next step and mass distribution is readily available via our day-one partners. Every person on the team ships product and shapes the direction of the company. Why Work Here * Build a product used globally from day one * Work with an extremely high-caliber team * Own major parts of the product and infrastructure * Ship fast and avoid corporate overhead * Compensated at the top of the market