How I Built a Full Escrow System with Milestone-Based Payouts

The Challenge

When building SkillFund — a creator-investor marketplace — I needed to solve one of the hardest problems in fintech: how do you hold investor funds securely while ensuring creators are protected from arbitrary withholding?

The answer was a milestone-based escrow system.

How the Escrow Works

Funds flow through three stages:

1. Investor locks funds — money enters the escrow wallet immediately on investment

2. Creator submits proof — deliverables, screenshots, revenue records

3. Investor approves or disputes — funds release or enter a 48-hour mediation window

If an investor doesn't respond within 72 hours, funds auto-release to protect creators from bad-faith investors.

The Technical Architecture

The escrow state machine has seven states: Locked, Active, Proof Submitted, Approved, Disputed, Auto-Released, and Completed. Each transition is validated server-side and logged with timestamps.

For payments, I integrated Paystack's transfer API for Nigerian naira payouts, with server-side webhook verification to prevent spoofed confirmations.

Lessons Learned

Never trust client-side payment events. Always verify on the server. Always have a rollback strategy for failed transfers. And always log every state transition — disputes are won or lost on audit trails.