8 Claude Code skills worth building based on Reddit posts with 9000+ upvotes

I went through the skill threads that did best on Reddit, 20 of them with 9,143 upvotes between them, and grouped them into 8 skills worth building.

1. Job application skill ($29 one time). Scores a job post against your CV, tailors the resume and tracks applications. From "I built an AI job search system with Claude Code that scored 740+ offers and landed me a job" (2,913 upvotes)
2. Design taste skill ($39 per style pack). One clear visual style so new screens stop looking like generic AI UI. From "I condensed 8 years of product design experience into a Claude skill" (875) and a list of 48 design skill files (1,077)
3. Launch checklist skill ($19). Auth, rate limits, backups and secrets before anything goes live. From "If you're about to launch a vibe coded app… read this first" (1,205)
4. Docs to skill ($9/mo for updates). Turns a library's docs into a skill the agent checks before it guesses an API. From a skill that turns technical book PDFs into something you can query (516)
5. Your voice skill ($19). Learns how you write and strips the patterns that read as AI. From unslop-text (424)
6. Demo video skill ($29). Scripts and records a product walkthrough from your running app (283)
7. Founder ops skills ($49). Support replies, store listings and weekly metrics. From "My iOS app is 4 months old and does $944 MRR. Every 'department' is a Claude Code skill" (220)
8. Session handoff skill (free). Writes a handoff note when a session ends and loads it when the next one starts

Each one has build steps and the threads behind it, free: Claude Code skills ideas