Top Tech Startups in San Francisco, CA in 2027

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.

Briidge.one, builds applied AI into how professional firms actually operate, not as another bolt on subscription but as systems grounded in a firm's own record, running inside the workflows people already use and owned outright once we hand over the keys. Another AI subscription doesn't change a firm. AI changes a firm when it runs inside the actual work, grounded in the firm's own data. Most professional firms, MSPs, private equity, investment firms, law firms, real estate, other professional services carry client relationships and institutional knowledge scattered across 5-10, sometimes 15 disconnected tools. Hours leak, records fragment and decisions wait on someone's memory instead of on data that should already be there. How we work We're a company, not a subscription. Every engagement runs through five stages: 1.Diagnose- an audit of how the firm actually operates, run by the people who will build the solution 2.Design- a roadmap naming which workflows, in what order, and what each is worth 3.Build- AI grounded in the firm's record, shaped to the workflow rather than a template 4.Integrate- connected to the tools the firm already runs, so one record moves instead of being retyped between systems 5.Improve- iteration after handover, sized to what's at stake. We build on the platforms professional firms already rely on Atera, ConnectWise, NinjaOne, HaloPSA, Datto, Autotask, DealCloud, Affinity, Datasite, Intralinks, Carta, PitchBook, Clio, iManage, NetDocuments, DocuSign, Yardi and MRI rather than asking firms to rip out what already works. What we put our name on: No outside logos to borrow. Clients own the code, the schema and the data outright with documentation complete enough for another team to take over. No lock in, nothing trained on a client's record and an exit built into every engagement from day one. We're building the team that will define what applied AI looks like for the firms that run the professional world.

Exponent is a community-based learning platform that helps you prepare for tech interviews in product management, engineering and more. Exponent offers premium courses, hands-on coaching and a community of learners to help you advance your career.

Nexalink builds healthcare AI infrastructure-as-a-service that helps organizations deliver clearer, more actionable member experiences. Our flagship product, CareCompass, is a configurable SDK that lets payers, providers, employers, and healthcare partners embed a branded care-navigation assistant directly into their existing web and member portals. CareCompass helps users understand benefits and bills, find and book in-network care, and identify the next best step in their healthcare journey. We pair a developer-first implementation path with tenant-scoped access, configurable branding, usage visibility, and healthcare-oriented security controls. Our mission is to make healthcare easier to navigate: less administrative friction for patients, faster access to appropriate care, and measurable improvements in conversion, in-network steerage, digital containment, and time-to-care.

LinkedUp Career Solutions (LinkedUpCv) is a boutique, remote-first talent acquisition and executive search firm built to help funded, high-growth companies hire the specialist and leadership talent that general recruitment cannot reach. Founded by Magugu Marylin Mhlanga, a Talent Acquisition Partner with 14 years of experience delivering recruitment outcomes across Africa, EMEA, Europe, the US, UK and the Netherlands, the firm combines full-cycle recruitment delivery with market intelligence, structured hiring advisory and a career-coaching practice that strengthens the candidate experience on both sides of the hire. Founded by Magugu Marylin Mhlanga, a Talent Acquisition Specialist with over 14 years of recruitment and executive search experience, LinkedUpCV provides tailored solutions for both employers and jobseekers. Our Mission : To empower professionals to achieve their career goals while helping organisations attract, engage, and retain top talent through strategic, people-centred recruitment solutions. Our Vision : To become a trusted talent and career solutions partner across Africa and globally, bridging the gap between opportunity and talent. What Makes Us Different ✔ Over 14 years of recruitment and talent advisory experience ✔ Local, African, and international market expertise ✔ Personalised, high-touch client service ✔ Strategic approach to career branding and talent acquisition ✔ Passion for empowering people and transforming careers At LinkedUpCV, we believe that every professional has a unique story, and every organisation deserves access to exceptional talent. Our role is to help both achieve their full potential. LinkedUpCv is purpose-built for venture-backed companies whose hiring needs have outgrown ad-hoc recruiting but who are not yet ready for (or don't want) a large in-house talent function. LinkedUp Career Solutions (LinkedUpCV) – Connecting Talent. Creating Opportunities. Building Careers.

Nest Navigate™ is a gamified AI education platform that helps renters become confident homeowners. We turn the homebuying journey into interactive lessons, personalized action plans, and real rewards. As users progress, they earn Nest Coins™ they can redeem for everyday savings and services that make the path to purchase more achievable. The problem we’re solving: Millions of renters feel locked out of homeownership due to credit readiness, budgeting gaps, and confusing processes. Traditional “education” is boring, one-size-fits-all, and not connected to tangible benefits. Our solution: AI-guided learning that adapts to each renter’s financial starting point. Milestone-based rewards (Nest Coins™) to build momentum and offset real costs along the way. A growing partner rewards marketplace with national and local brands so users save money now while preparing for tomorrow. Clear progress tracking across key steps (credit, savings, pre-qualification, touring, and closing). Where we are now: MVP built, early user traction, and expanding partner offers while we iterate toward a nationwide launch. We’re an edtech/fintech platform (not a brokerage), designed to complement— not replace—professionals who support buyers. Our mission: Turn aspiration into action by giving renters the knowledge, plan, and rewards to move from renting to owning.