Skip to content

feat: add /cfo skill — technology cost analysis and ROI#159

Open
HMAKT99 wants to merge 1 commit intogarrytan:mainfrom
HMAKT99:arun/cfo-skill
Open

feat: add /cfo skill — technology cost analysis and ROI#159
HMAKT99 wants to merge 1 commit intogarrytan:mainfrom
HMAKT99:arun/cfo-skill

Conversation

@HMAKT99
Copy link

@HMAKT99 HMAKT99 commented Mar 18, 2026 •
edited
Loading

"What does our technology actually cost per user?"

The board asks every quarter. Engineering guesses. Nobody knows the real infrastructure cost per user, which services scale linearly vs exponentially, or that the abandoned Redis cache is still costing $200/month.

What /cfo does

You:   /cfo

Claude: INFRASTRUCTURE COST MODEL
        Service          Cost Driver        Est. Monthly    Scaling
        Database         Storage + IOPS     ~$400/mo        Linear
        Redis            Memory             ~$80/mo         Linear
        CI/CD            Build minutes      ~$150/mo        Linear w/ PRs
        Monitoring       Per-host           ~$200/mo        Step function ←

        TECHNICAL DEBT BALANCE SHEET
        Category          Items   Est. Hours   Interest Rate
        Missing tests      12      ~40 hrs      Medium
        Deprecated deps     8      ~20 hrs      High (security)
        Manual processes    3      ~6 hrs/mo    Continuous ←

        TOTAL PRINCIPAL:    ~80 engineering hours (~$12,000)
        MONTHLY INTEREST:   ~6 hrs/month in friction

        BUILD vs. BUY:
        Auth (Auth0)     $300/mo   ~8 eng-weeks to build   → BUY
        Search (Algolia) $500/mo   ~3 eng-weeks to build   → EVALUATE

Maps services to cost drivers. Quantifies tech debt as a balance sheet. Build-vs-buy scorecards. Scaling projections at 10x/100x. Engineering ROI from git history.

Only .tmpl committed — bun run gen:skill-docs generates the rest.

Test plan

  • .tmpl follows template pipeline
  • Registered in gen-skill-docs.ts, skill-check.ts, test files

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment

Reviewers

No reviews

Assignees

No one assigned

Labels

None yet

Projects

None yet

Milestone

No milestone

Development

Successfully merging this pull request may close these issues.

1 participant

@HMAKT99