Hey Product Hunt! 👋

I built Fault Tolerant after failing my own system-design rounds — I knew the concepts but had never practiced the performance: scoping out loud, drawing under time pressure, defending trade-offs.

What makes it different:

• The AI interviewer watches your canvas and interjects as you draw — add a load balancer and it'll ask about failover
• Three linked design layers: high-level architecture, database schema (ERD), and low-level class design
• A strict timed mode that pushes back if you skip clarifying questions
• A scored 5-dimension review after every interview

Free plan: 3 full timed interviews, no card required.

I'd love your feedback — especially from folks currently prepping or folks who interview candidates. What would make this a must-use for you?

— Harjaspreet

Hey Product Hunt! 👋

I built Fault Tolerant after failing my own system-design rounds — I knew the concepts but had never practiced the performance: scoping out loud, drawing under time pressure, defending trade-offs.

Free plan: 3 full timed interviews, no card required.

I'd love your feedback — especially from folks currently prepping or folks who interview candidates. What would make this a must-use for you?

— Harjaspreet

Fault Tolerant · System Design

AI system-design mock interviews with live whiteboard review

AI system-design mock interviews with live whiteboard review