Can you recommend a prototyping platform for high-fidelity mockups and interactive prototype sharing for a startup product team?

Yes — for a startup product team, my top recommendation is Figma.

Why Figma is usually the best fit

• High-fidelity mockups: Excellent for polished UI design
• Interactive prototypes: Easy to add clickable flows, transitions, overlays, and animations
• Team collaboration: Multiple people can work in the same file in real time
• Sharing: Simple share links for stakeholders, clients, and engineers
• Cross-platform: Browser-based, so no install issues and easy access anywhere
• Design handoff: Good comments, version history, and dev inspect features

When Figma is especially strong

• You want one tool for design + prototyping + collaboration
• Your team is small and needs to move fast
• You need a tool that non-designers can review easily
• You want to share prototypes externally without friction

Strong alternatives

• Framer — better if you want more realistic, highly interactive prototypes that feel closer to a real product
• Axure RP — best for complex logic-heavy prototypes and detailed flows, but less modern/easy than Figma
• ProtoPie — great for advanced interactions and motion design, especially if realism matters a lot
• Adobe XD — usable, but generally less compelling than Figma for most startup teams today

My practical recommendation

• Default choice: Figma
• If you need advanced interactions: ProtoPie or Framer
• If your prototypes are highly complex and functional: Axure

If you want, I can also give you a short comparison table based on team size, budget, and prototype complexity.