Senior Software Engineer, Annotations
Core
Build systems and tools that power high-quality human data for frontier AI companies, enabling operators to manage annotation projects and scale expert workflows.
Role type
Senior Software Engineer (Platform/Operations)
Builds
Operator tooling, quality-control systems, and full-stack features for the annotation lifecycle.
Domain
AI data operations / Human-in-the-loop systems
Deliverable
production ML models
Required skills
Python, Node.js, TypeScript, React, PostgreSQL, backend APIs, scalable system design, architectural tradeoffs, project ownership, product judgment, code quality, mentoring (via careerplan.io/jobs/d0920e75-c872-4f73-87a2-c54ee84725bc-senior-software-engineer-annotations-at-handshake)
Preferred skills
workflow/marketplace/platform software, AI/ML data pipelines, annotation systems, distributed teams, open source contributions
Technologies
Python, Node.js, TypeScript, React, PostgreSQL
Responsibilities
Build and scale operator tooling for project management and auditing; Design workflows and quality-control systems; Develop performant full-stack features; Establish technical direction for complex projects; Lead projects from concept to production delivery; Mentor engineers and improve engineering processes
Seniority
Senior, hands-on IC with mentorship responsibilities
