How do you effectively collaborate with Product Managers and Designers during the discovery and sprint planning phase?

In Simple Words: Engage early during discovery, not after Figma designs and PRDs are finalized. Help PMs understand technical constraints and help designers understand edge cases (empty states, errors, high latency).

Key Practices:

• The "Three Amigos" Meeting: Product Manager (What & Why), Designer (User Experience), and Lead Engineer (Technical Feasibility) meet before sprint planning.
• Surface Invisible States: Remind designers about loading skeletons, offline states, 500 error boundaries, and edge cases with long user names.
• Provide Cost Estimates Early: "Option A with instant real-time WebSockets takes 4 sprints. Option B with 10-second polling takes 3 days and delivers 95% of the same user value."

Practical Script & Summary Template

### Engineering & Design Edge-Case Matrix:
- **Empty State**: What does the dashboard display when a customer has 0 orders?
- **Loading State**: Are skeleton loaders or spinners displayed during slow 3G connections?
- **Error State**: How does the UI gracefully inform the user if the payment gateway rejects their card?
- **Extreme Inputs**: Does the user profile card break when a customer has a 50-character name?