The Prompt Portfolio: A New Artifact for Senior Engineers
What to include, how to evaluate it, and why it's replacing the side-project portfolio for senior hires.
A side-project portfolio used to be the strongest signal for senior hires outside of references. In 2026, the equivalent artifact is a prompt portfolio — a curated set of prompts, eval sets, and outcome traces that show how you turn an LLM into a reliable tool.
What a prompt portfolio looks like
- A README describing the problem domain and your workflow.
- 3–5 flagship prompts with clear input/output contracts.
- Eval sets — examples, expected outputs, and measured accuracy.
- Trace logs showing failure modes you caught and fixed.
Why it signals senior
Anyone can write a prompt. Only engineers with taste can write an eval set. The eval set is where judgment lives — and interviewers know it.
How to host it
A public GitHub repo with a clean directory structure works fine. Don't overthink the platform. The artifact is the value.
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