Route AI requests across frontier and open-source models. Turn verified production outcomes into private evaluations and company-specific models with Riften. Backed by Y Combinator.
About the role
As a Founding Engineer, you won’t just be writing code—you will be architecting our core platform from scratch, defining our engineering culture, and shaping the product roadmap alongside the founders.
What they're looking for
- The Ultimate Generalist: You are a full-stack product engineer who loves diving into complex infrastructure but equally cares about building a flawless, intuitive user experience
- 0-to-1 Builder: You thrive in ambiguity. You don't need a perfectly spec'd ticket to start building—you figure out what needs to exist and execute
- Product-Minded: You think like a founder. You care deeply about why we are building something and how it impacts the end-user
- High-Agility: You have a bias for action and are energized by a fast-paced startup environment
More about this role
We are an early-stage, fast-moving team building the next generation of data and AI infrastructure. Backed by top-tier venture capital, we are solving high-stakes, complex enterprise challenges by shifting traditional paradigms. We move fast, value extreme ownership, and prioritize shipping exceptional software over rigid processes.
As a Founding Engineer, you won’t just be writing code—you will be architecting our core platform from scratch, defining our engineering culture, and shaping the product roadmap alongside the founders.
- Architect & Build: Design, implement, and scale our core infrastructure, data pipelines, and end-to-end agentic workflows from the ground up.
- Own the Stack: Take complete ownership of entire product verticals—from robust backend systems and API integrations to custom frontend widgets and interactive developer tools.
- Ship at High Velocity: Rapidly prototype and deploy production-ready features, balancing speed with clean, extensible architecture.
- Shape the Culture: Help interview, mentor, and build out the initial engineering team while establishing robust development and deployment best practices.
- Collaborate Closely: Work directly with the...
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