Top Tech Startups Hiring Remote Workers 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.

MedReveal is building the rate intelligence layer for healthcare contracting. Since 2022, federal Transparency in Coverage rules have required insurers to publish what they pay every provider for every service. The data is public, but it’s practically unusable: petabytes of machine-readable files, each payer with its own format, and nothing a practice or consultant can actually query. We turn that raw data into clean, searchable benchmarks and an AI copilot, so independent practices, IPAs, MSOs, and healthcare consultants can see what UnitedHealthcare, Aetna, Cigna, and Blue Cross pay in their market and negotiate contracts with real numbers instead of guesswork.

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

Apt is building an AI-native workplace for building and measuring professional capability through real work. Today, people are largely evaluated through CVs, degrees, interviews, and credentials, claims about what they can do. We believe a better signal is what someone actually does when given meaningful work. Apt gives people a realistic workplace where they can take on roles, solve real problems, collaborate with AI coworkers and other people, make decisions, and build a verifiable history of how they think, collaborate, and execute.

We work hands-on with ventures from early validation through scale-up, providing shared infrastructure, operational excellence, and execution discipline — while keeping ventures autonomous and founder-led. Our model is decentralized and pragmatic: - flat hierarchies - strong ownership - decisions grounded in data The venture builder exists to accelerate execution, not to centralize power or slow teams down.

We work with leading AI labs to make advanced models deployment-ready, across the post-training and assurance stack: red teaming, vulnerability discovery, safety evaluations, agent-behavior testing, and the datasets and frameworks that make it measurable. If capability asks "what can the model do?", we ask "what happens when it fails, and how do we prevent it?" Why this matters: Every technology cycle begins with capability and matures through trust. The internet, cloud, mobile, and social all ran the same arc, with security and governance becoming indispensable only after the first wave of scale. AI is crossing that threshold now, and the assurance layer is becoming foundational. We're building the firm that does it to a benchmark standard.

Sittsy is a pet-sitter marketplace connecting pet owners with trusted local sitters - boarding, doggy day care, home visits, dog walking and house sitting. Free messaging, secure in-app payment, the Sittsy Guarantee up to €20,000, and identity-verified sitters. Operating in France (3,656 sitters), Spain, Italy, Poland and 90+ countries. Founded in 2025.