River builds voice AI agents for B2B companies. Our agent talks with prospects in real time, answers hard questions, and demos the product by actually controlling a browser while it speaks. Every call runs on a sub-second loop: speech, a rendered avatar, several LLMs, and a live browser-use agent, in front of real buyers. $2M pre-seed backed by founders of Ramp, Kalshi, and JumpCloud. Hiring two roles: Founding Engineer (5+ yrs): own the live-call pipeline (real-time voice, avatar, browser streaming) and the infra behind it. Looking for strong backend/infra plus real-time experience (WebRTC, voice/video, websockets). Stack: TypeScript, Node, Next.js, Postgres, Redis, LiveKit. Product Engineer, full-stack (1-3 yrs or exceptional projects): build the services behind live calls, LLM workflows, and the browser-use agent that runs demos. Backend-leaning, TypeScript. Both on-site in NYC, working directly with the founders. Try the product yourself at rivergtm.com/start. Email me (co-founder/CEO): tarek@rivergtm.com

River is a client-focused Bitcoin financial institution committed to empowering the long term investor. We focus on providing industry-leading security, robust financial services, and a world-class client experience to individuals and businesses looking to invest in Bitcoin.

Riverline is building AI agents for debt collections — think voice + WhatsApp agents that negotiate, resolve, and collect at scale. Backed by South Park Commons, DeVC, and gradCapital.

Rivet is an AI marketing platform that boosts D2C revenue for brand and creator teams by growing their communities and powering their direct-to-fan marketing and sales across all channels. Artists like Chance the Rapper, Major Lazer, and John Legend use Rivet to engage their fans.

The ultimate goal of Rivian's new AI Hub in London is to accelerate the development of our Autonomy Platform to achieve higher levels of autonomous capability, making our vehicles safer, more technologically advanced, and "time-restoring" for our users. About us in general: We’re a US-based EV company building groundbreaking electric trucks, SUVs, and commercial vehicles — and an integrated ecosystem of hardware, software, and services in order to keep the world adventurous forever.

Rivio embeds procurement intelligence directly into sourcing and negotiation workflows — helping teams capture savings and build institutional knowledge without adding headcount. Backed by Google, MIT, S32. Customers include Checkr, Cribl, Brex, Harvey, Oura.

We provide isolated runtimes for executing untrusted code, mostly generated by LLMs. Our sandboxing is powered by a combination of WebAssembly, V8, and microVMs. Our customers do things like extract data from log lines at run time by asking claude-3-7-sonnet to generate a parsing function on-the-fly and then sending it to us for execution.

We use WASM to provide isolated runtimes for executing untrusted code, mostly generated by LLMs. Our customers do things like extract data from log lines at run time by asking claude-3-5-sonnet to generate a parsing function on-the-fly and then sending it to us for execution.

Ltsyyw LLC

Ro is building an end-to-end healthcare platform (telehealth + labs + pharmacy) used by 2M+ patients. We’re hiring senior backend engineers who want end-to-end ownership: you’ll drive projects from problem framing → architecture → shipping incremental improvements → measurement and iteration, partnering closely with product/design/clinical.