Top Tech Startups in California, US in 2026

We are a fully funded, early stage healthcare technology company building a SaaS platform that will serve millions of patients across the US. We have strong institutional backing, a built-in customer base, product champions and a founding team with deep expertise across healthcare operations, clinical care, and software engineering. We are not outsiders looking in. We are deeply embedded in the industry we are building for, and that gives us a clarity of vision and direction that most startups spend years trying to find. The destination is clear. We are building a team that makes getting there the best part. We are hiring Senior and Staff engineers who want to help us go from 0 to 100 and shape the culture along the way.

SportsReflector is the first multi-sport AI coaching platform — combining AI video analysis, real-time AR form correction, AI workout planning, and AI nutrition tracking across 22+ sports and every gym exercise. We're collapsing three software categories that have each produced billion-dollar outcomes independently — AI sports coaching (HomeCourt, SwingVision), AI fitness planning (Fitbod, Future), and AI nutrition tracking (Cal AI, MyFitnessPal) — into a single integrated platform at half the price. On-device inference via CoreML means zero GPU cloud costs per analysis. Gross margin scales with subscriptions, not usage volume. Pre-seed. Solo technical founder. Live on iOS App Store. 25 languages. Weekly shipping cadence.

Early-stage startup.

Atreo has revolutionized the client experience by harnessing industry expertise and modern technologies to thoughtfully create the next-generation RTSM platform. The Atreo team, comprised of RTSM SMEs and Advisors, has addressed all the pain points common of legacy RTSM deployments, offering novel advantages with specific emphasis on: • Speed: 1 - 2 week RTSM build from Kickoff to Go-Live - Atreo’s revolutionary System Design Experience allows systems to be built within 1-2 weeks, including system specifications • Rapid Prototyping: Preview your RTSM, tailored to your protocol, at Bid Defense & throughout System Design Experience • Quality Quantified: Atreo’s modern architecture and process provides unmatched and quantifiable quality advantages through a hybrid of modern testing practices, allowing for unmatched testing coverage and time savings • Agility: Atreo RTSM offers unmatched configurability and Post Go Live System agility, including the majority of system changes at no cost Atreo's mantra is Time Better Spent. Please reach out to our team to learn how our mantra will become your reality and expectation when partnering with Atreo.

Hiring is broken on both sides. Candidates fire hundreds of resumes into black boxes and hear nothing back. Companies make six-figure decisions on a one-page PDF and a good interview performance, then hope for the best. Cruitical is an AI-native hiring platform built to fix that. Instead of resumes and phone screens, we show how a candidate actually works before the first interview. Candidates build a deep profile, have a real conversation with our AI about how they think and what they've built, and complete a short work trial in a lifelike sandbox using the same AI tools they'd use on the job. Companies get honest signal on real ability, not keywords. For candidates, it means one application that opens many doors. We work with a growing roster of venture-backed startups, get to know each candidate once, and route them to the teams where they're the strongest fit. Everyone gets evaluated on what they can do, everyone gets real feedback, and strong matches get introduced directly to founders who are already hiring. We're a team out of Carnegie Mellon, backed by Founders Inc., and we've assessed over 4,000 candidates so far. We're building toward a world where getting hired comes down to two honest questions: can you do the job, and do you care about doing it well. Making hiring human again.

Eudia is revolutionizing legal work with AI-powered Augmented Intelligence, empowering Fortune 500 legal teams to act swiftly, manage risks with precision, and unlock transformative business value. With $105M in Series A funding led by General Catalyst, we’re crafting a category-defining platform that fuses AI-driven automation with human expertise, reimagining legal as a strategic growth engine rather than a cost center. Our pace is relentless—shipping solutions in days, not months—for global giants like Cargill, Coherent, DHL, and Duracell. We’re tackling one of AI’s toughest challenges: delivering trust, accuracy, and security in legal automation. At Eudia, we’re a team of bold builders and problem-solvers, driven to reshape an industry ripe for disruption. If you’re obsessed with redefining the future, we want you with us.

FleetHD is the intelligence layer for fleet maintenance — turning raw diagnostic, inspection, and operational data into the alerts, priorities, and insights that commercial fleet teams rely on, from the maintenance office to the shop floor to the roadFleetHD ingests and cross-references data from telematics providers, sensors, DVIRs, and other fleet systems — including fault codes, malfunction indicators, sensor readings, and inspection results — and processes it through a configurable intelligence engine that separates actionable signals from noise. The platform delivers prioritized alerts, vehicle health scoring, diagnostic insights, and resolution tracking to maintenance teams through real-time notifications, dashboards, and mobile tools.

River is the first social app that works for you, not the algorithms. Search, post, chat, call and shop exactly like you do on Facebook, Whatsapp, TikTok, or ChatGPT—only every data point you share is permissioned, bank-grade encrypted, and pays you a cut when brands want access. One tap to consent, one tap to cash in. Same fun scroll, none of the silent surveillance.