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Quick Answer
Launching a DeFi protocol requires a 27-week execution plan: Weeks 1-4 for architecture and specification, Weeks 5-16 for development (including 95%+ test coverage), Weeks 17-22 for audit, Weeks 23-26 for launch preparation, and Week 27+ for mainnet deployment with monitoring. Common failure reasons include TVL concentrated in protocol-owned token emissions and lack of genuine utility beyond yield farming.
Weeks 1–4: Architecture and Specification
Week 1: Define the core mechanism. Write a 2-page plain English description of what your protocol does and how it works. Show it to 10 potential users. Can they explain it back to you? If not: simplify.
Week 2: Platform selection. Which chain? Document the decision with specific reasons tied to your use case (liquidity depth, user base, gas costs, ecosystem).
Week 3: Technical specification. Every function, every state variable, every event. The spec should be detailed enough that two different teams could independently implement the same contract.
Week 4: Oracle design. Draw the oracle architecture: which price feeds, what divergence threshold, what happens if the oracle fails. This is non-negotiable before writing code.
Weeks 5–16: Development
Weeks 5–8: Smart contract development. CEI pattern throughout. No external calls before state updates. Custom errors. OpenZeppelin for standard components.
Weeks 9–12: Testing. 95%+ line coverage mandatory. Fuzz tests on all critical math functions. Invariant tests. Fork tests against mainnet state.
Weeks 13–14: Internal security review. Run Slither, Aderyn, Mythril. Review every finding. Fix all Critical and High.
Weeks 15–16: Frontend development. Transaction status management. Gas estimation. Error handling. WalletConnect + RainbowKit.
Weeks 17–22: Audit
Week 17: Submit to audit firm. Prepare documentation package: architecture diagram, invariants list, known issues, integration points.
Weeks 18–21: Audit execution. Answer auditor questions promptly. Begin remediation planning as findings come in.
Week 22: Receive draft report. Triage findings. Prepare responses. Implement Critical and High fixes immediately.
Weeks 23–26: Launch Preparation
Week 23: Remediation complete. Submit to auditor for re-review. Bug bounty launched on Immunefi (minimum $50K Critical bounty).
Week 24: Deploy to mainnet testnet (Sepolia/Arbitrum Sepolia). Run for 1–2 weeks. Test with team members using real workflows.
Week 25: Multi-sig configured and tested. All keyholders execute a test transaction. Emergency pause tested.
Week 26: Final audit report received. Publish publicly. Announce launch date.
Week 27+: Launch and Monitor
Deploy to mainnet via multi-sig. Initial TVL cap (e.g., $500K max for first 30 days). Monitor Forta alerts and Tenderly alerts 24/7 for first week. Daily metrics review for first 30 days.