Prompt Engineering Lead (Contract)

Nebulai; United States; On-site; USD 120,000 - 180,000; Full time

Job summary

Nebulai in the United States is seeking a leader to craft and maintain prompts and instructions for our AI assistants in a real-world marketplace.

You will write system prompts, tool instructions, and examples that guide model behavior, build evaluation sets to detect regressions, and coach product and engineering teams on prompt changes without breaking existing work.

Qualifications

• Written and maintained prompts for an LLM product used by real users.
• Measure prompt changes with evaluation sets rather than gut feel.
• Read failed conversations and explain exactly why the model went wrong.
• Write clearly so others can pick up and extend prompts.

Responsibilities

• Lead prompt and instruction work for Nebulai's marketplace.
• Coach product and engineering teams on how prompts should evolve without breaking existing work.
• Develop test sets to catch regressions before release.

Skills

Prompt engineering

Prompt writing

Evaluation/benchmarking

Communication/writing

Team leadership (bonus)

Job description

Lead the prompt and instruction work that turns AI assistants and agents into tools people trust at work.

Through Nebulai's marketplace, you join companies putting LLM features in front of real users. You write and version the system prompts, tool instructions, and examples that shape model behavior, build test sets that catch regressions before release, and coach product and engineering teams on how to change prompts without breaking what already works.

You'll be a strong fit if you:

• Have written and maintained prompts for an LLM product that real users rely on
• Measure prompt changes with evaluation sets instead of gut feel
• Can read a failed conversation and explain exactly why the model went wrong
• Write clearly enough that other people can pick up your prompts and extend them

Bonus if you've led a small team or set prompt standards across several products.