Cinder helps high-growth companies design, automate, and scale modern trust and safety operations. Backed by Accel.
About the role
This isn't a generic full-stack role. Here's what's actually on the roadmap right now and what you'd be contributing to: AI agents that review content against customer policies, callable from within our durable workflow engine. We're moving from hardcoded LLM prompts to a configurable agent spec that customers can edit and deploy themselves.
What they're looking for
- 5+ years building production software, with experience across the stack: Django or similar backend frameworks, React or similar on the frontend, relational databases, and message/event systems
- You have a real point of view on how AI tooling has changed the way you write code. We use it extensively and expect engineers to be fluent and opinionated, not just familiar
- End-to-end ownership. Even as AI code gen changes how frontend code gets written, you need to understand how the backend is designed to build something usable from start to finish. You'd own features from data model through API through UI
- Clear written communication. We're a distributed team with a concentration in NYC, and we work closely with customer-facing teams. You need to write clearly in PRs, Slack, and customer-facing documentation
More about this role
Cinder is the mission-critical infrastructure that keeps the world's most important digital platforms true to what they stand for. The internet has always been abused by bad actors, and AI is making it exponentially worse, driving fraud, abuse, and manipulation at a scale and speed no human team can fight alone. Cinder gives platforms one command center to fight back: to write and enforce policy, deploy AI agents against abuse in real time, investigate threats, file NCMEC reports, and prove their safety programs are working.
Our customers are some of the largest internet platforms in the world. The decisions made in our software directly determine what stays up, what comes down, and how users are treated.
We're a small, fast-moving team backed by Accel and Y Combinator. We care about being intentional, direct, and deeply focused on solving real customer problems.
You'd be building the infrastructure that some of the largest online communities in the world depend on to function. The problems aren't hypothetical: state-sponsored disinformation, CSAM reporting, coordinated abuse at scale. The software you build is used daily by the reviewers, investigators, and T&S leads making the...
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