Racster is building a racket sports community and booking platform. Pre-incorporation; early-stage venture aiming to define architecture, product direction, and technical standards for a scalable, AI-assisted SaaS booking platform built around Laravel. 100% remote; equity-based long-term ownership; currently validating MVP with hundreds of club clients; independent/pre-incorporation stage.

Founded by the youngest US radiologist in history, Rad AI empowers physicians with AI to save time, reduce burnout, and improve the quality of patient care. By combining deep expertise in healthcare and AI and using one of the largest proprietary radiology report datasets in the world, Rad AI has uncovered hundreds of new cancer diagnoses for patients and reduced the error rate in tens of millions of radiology reports by nearly 50%. The company has raised $80+ million to date from venture funds and just closed on its series B financing with investors Khosla Ventures, Gradient (Google’s AI fund), and ARTIS. Rad AI has also formed a partnership with Google to collaborate on the future of generative AI to redefine healthcare.

Radar Labs is the location infra dev tool. Doing 1B+ API calls per day. Our main languages are Rust and TypeScript, we also use mobile and offline pipeline languages (Python, Scala, and Terraform). We're based in NYC with our HQ in Union Square. Interesting things we're working on include HorizonDB, our Geospatial database written in Rust, precise indoor location more accurate than iOS and Android leveraging Ultra-wideband, other sensors on the device and ML models, mobile infrastructure that automatically configures itself optimizing battery-life and location accuracy for different use-cases over time, multi-region AWS deployment, 99.99%+ availability, speeding up deploys of backend data services with EC2 Warm Caches, automating security posture with Vanta, and frontend tools to visualize and debug location data at scale.

Radiance is a design agency powered by The Source®, our Creative OS that combines design, automation, and AI to scale brands. We’re backed by Invisible and are looking for a founding engineer to help us build LLM-native tools that power real creative workflows.

Radical AI is a company focused on changing the way materials are designed, developed, and discovered. They aim to build a full stack solution from AI generated materials to autonomous, high-throughput experimentation, resulting in a new paradigm of scientific discovery.

Radical Numerics is an AI research lab building general biological intelligence. We're bringing the rigor of distributed systems, model architecture, and numerics research to biology. Our team created Evo and helped start the field of generative genomics — our work has been on the cover of Science, featured in Nature, and presented at TED2025. We're now scaling our research and infrastructure teams to build the next generation of scientific world models.

Raidium develops a radiological foundation model as the 'GPT' of radiology. This new generation of AI will enable the building of an imaging biomarker factory for both clinical practice and research, tackling the complexity of precision medicine. We are a team of 10, with machine learning engineers, researchers, and doctors.

Raiffeisen Software is involved in building and evolving a company-wide Design System used across more than 400 applications in over 7 business units.

Rail Europe is a global travel tech company and the reference brand for European train booking.