Top Tech Startups in California, US in 2027

Riley AI builds adaptive artificial intelligence to help organizations easily transform their data into better strategies and decisions.

Galvix's core platform streamlines the sales tax compliance process, empowering SaaS companies to stay fully compliant while saving valuable time and resources. Galvix automates everything from sales tax calculations to filing returns, ensuring accurate and timely compliance with state and country-specific tax laws. By leveraging cutting-edge technology, we provide a comprehensive solution that helps businesses avoid penalties, mitigate risks, and focus on their core operations.

Resilient data movement for agentic AI with software, systems and silicon delivering low latency and high bandwidth data network between compute, memory and storage.

CROSSK is building Whitebrinjal — an AI-driven decision infrastructure for complex enterprise technology procurement. Enterprises struggle to evaluate emerging technologies because the hardest work happens before procurement: defining the problem, aligning stakeholders, comparing unfamiliar solutions, validating fit, and building the business case. Whitebrinjal structures this fragmented pre-procurement journey into a decision layer—helping enterprises move from complex problems to decision-ready engagement with the right technology providers, while helping providers reach qualified enterprise opportunities with context, intent, and stakeholder alignment. We are solving the gap between “we have a complex problem” and “we know what to buy, why, and from whom.”

Our goal at P-1 AI is to develop an artificial general engineering intelligence—and eventually superintelligence—that can help the human species design physical systems more efficiently and at unprecedented levels of complexity. Going beyond existing foundation models, our autonomous AI agent learns from synthetic training data and real-world feedback and reasons over an internal multi-physics representation of a product design that encompasses both geometry and function. We are a world-class team of AI researchers, engineers, and top industry executives backed by some of the best investors in Silicon Valley and beyond.

PhrasIQ builds decision infrastructure for enterprise finance. Enterprises have invested heavily in systems of record to store data, systems of analytics to understand it, and increasingly systems of intelligence to generate answers. Critical business decisions still move slowly, because finance teams must reconcile fragmented data, validate assumptions, investigate variances, and defend their reasoning before anyone can act. We call this decision latency. Our core belief: trust, not AI capability, is the bottleneck in enterprise decision-making. Rather than pointing AI at fragmented data, PhrasIQ establishes structured truth first, through deterministic reconciliation, lineage tracking, governance, and auditability. On that foundation we deliver explainable forecasts, variance analysis, anomaly detection, and decision recommendations that CFOs and VPs of Finance can act on. Beyond faster decisions, PhrasIQ captures the assumptions, reasoning, outcomes, and learnings behind every decision, so the organization gets smarter with each one. We believe this is the next foundational enterprise software category: systems of decision. We are focused on enterprise finance, where trust, accountability, and auditability are mission-critical, with a long-term vision of becoming the decision infrastructure layer for the modern enterprise.

Plato is an applied research lab that transforms real-world data into simulated environments for training and evaluating agents. We believe the future of model adoption belongs to organizations that can turn their data into structured systems for teaching agents new knowledge and capabilities. We currently work across a majority of the major AI labs every day and are hiring world class teammates to add to our small but growing team of elite engineers. We just raised significant capital to support our growth and are seeking the best talent to add to our team.

We aggregate federal and state geospatial datasets and regulatory documents and build AI systems to give project developers and contractors automated spatial intelligence from site selection to permitting to project development across carbon sequestration, geothermal, hydrogen, and minerals projects.

StimScience, the company using personalized neuroscience to improve sleep, is the developer of the revolutionary new consumer sleep aid, Somnee. Somnee is the first-ever electronic sleep aid headband to use personalized non-invasive brain stimulation to improve the wearer’s sleep quality. In a 1,500 night home pilot study, Somnee cut the time it took beta users to fall asleep in half, and it reduced the amount of overnight tossing and turning by more than one-third. Learn more and place pre-orders at trysomnee.com.

Kargo.ai is transforming the future of logistics through Physical AI. We're building the AI-powered infrastructure for an autonomous supply chain, combining computer vision, artificial intelligence, and purpose-built hardware to bring real-time visibility and intelligence to the movement of freight. Our technology transforms traditional loading docks into intelligent operations, automatically capturing and analyzing freight movement to help enterprises improve efficiency, reduce manual processes, and make smarter decisions across their supply chains. Trusted by global brands including McDonald's, Mercedes-Benz, Ford, Rivian, and DHL, Kargo's technology is deployed across logistics facilities in the U.S. and internationally, delivering measurable impact in real-world environments. Backed by leading investors, including Avenir, Kargo raised a $42M Series B in 2025 to accelerate our growth and expand our Physical AI platform. We're a team of engineers, innovators, and problem-solvers tackling complex challenges at the intersection of AI, hardware, and enterprise software. As a growing startup, we offer the opportunity to take ownership, move quickly, and make a meaningful impact while building technology that's shaping the future of global supply chains.