Senior Software Engineer, Annotations
Handshake, San Francisco, CA
The role
We’re looking for a Senior Software Engineer to join our Annotations team and build the systems that power high-quality human data for frontier AI companies. You’ll work at the intersection of product engineering, distributed systems, and AI data operations—designing tools that help operators manage annotation projects, improve task quality, and scale expert workflows.
This is a high-ownership role in a fast-moving environment. You’ll partner closely with product, design, data, operations, and engineering teams to turn ambiguous problems into reliable, intuitive software used across the annotation lifecycle.
What you will do
- Build and scale operator tooling that enables teams to create, manage, prioritize, and audit annotation projects.
- Design workflows and quality-control systems that improve task accuracy, throughput, and customer outcomes.
- Develop performant full-stack features using Node.js/TypeScript, React, PostgreSQL, GraphQL and tRPC..