Senior CNC Machining Specialist - Rubric Author & Validator

Obsidian; San Francisco (CA); On-site; USD 70,000 - 110,000; Full time

Job summary

Obsidian is assembling a team to build a high-quality evaluation dataset for CNC manufacturing. We seek experienced CNC machinists to author and validate grading rubrics for CNC machining work, bringing real production-floor judgment to determine whether a machining approach would be approved or rejected for a production run.

You will write clear verification rationales for each criterion, contribute to objective rubrics across CAD models and machining context, and review sample solutions to

Qualifications

• 5+ years of hands-on CNC machining experience.
• Strong production judgment - able to tell what would and wouldn't run safely on a real machine.
• Written English fluency (all deliverables are text-based).
• Experience with hobbyist machines (Makera Carvera) and Haas machines (VF-2).

Responsibilities

• Contribute to text-only, objective, verifiable rubrics for grading CNC machining solutions across provided CAD models and machining context (stock, machine, tooling).
• Write clear verification rationale for each criterion.
• Review sample solutions and explain pass/fail outcomes.

Skills

CNC machining

Production judgment

Technical documentation

Tools

Haas VF-2

Makera Carvera

Job description

Obsidian is assembling a team to build a high-quality evaluation dataset for CNC manufacturing. We seek experienced CNC machinists to author and validate grading rubrics for CNC machining work, bringing real production-floor judgment to determine whether a machining approach would be approved or rejected for a production run.

You will write clear verification rationales for each criterion, contribute to objective rubrics across CAD models and machining context, and review sample solutions to