Cantina Labs is building AI-powered characters that help people tell stories, connect, and create — and we are looking for a Senior Backend Engineer to help scale the platform behind it all. As part of the backend team, you'd be designing and building the systems that drive how users find, onboard to, and stick with the product. A lot of the work is growth-focused — improving acquisition flows, optimizing user journeys, and experimenting with new tech to make the experience feel seamless. You'd also be contributing to the broader infrastructure to keep things reliable as the platform grows. What's great about this role is the ownership. It's built for someone who can run independently, work cross-functionally with product and design, and care about business outcomes — not just clean code. You'd be working on one of the faster-growing social AI products out there, which means real exposure to how AI systems operate at scale. If you're excited about AI, characters, and creative social experiences — and you want your engineering work to have a direct impact on how people actually use the product — this one's worth a look.