Prepd is an interactive gym for software engineering interviews, focused on system design. Instead of watching videos about caching, you open a real problem, draw the architecture on an interactive whiteboard, and get AI feedback on your solution in seconds. It launched on Hacker News on November 2, 2026.
The platform covers three tracks: system design (HLD) with distributed systems, caching, load balancing, and microservices; low-level design (LLD) with SOLID principles, design patterns, and API contracts; and AI/ML systems with feature stores, model serving, recommendation engines, and MLOps. Every exercise is based on a system running in production at a real company, from Netflix cold-start to Uber-scale pricing.
Key features
- Interactive whiteboard: drag components, draw connections, add caches, queues, and databases, then get instant evaluation of missed components, scaling bottlenecks, and unnecessary complexity.
- Phased AI mock interviews: a realistic flow from requirements and scope through estimation, API design, high-level architecture, and deep dive, ending with a detailed scorecard.
- AI-assisted coding round pack: 50 original problems and 250 drills for the newer interview format where companies hand you a real codebase and an AI assistant.
- Three practice modes: Learning Mode for quick daily drills, Interview Mode for full timed simulations, and Instant Feedback for evaluation after every exercise.
- Skill radar and analytics: track progress across 12+ dimensions and see your readiness score improve over time.
- BYOQ: bring your own question and practice with any design problem you want.
Who it is for
Prepd is for software engineers preparing for system design and coding interviews, especially at companies that run FAANG-style loops. It suits people who learn by doing rather than by watching, and the AI-assisted coding pack is aimed squarely at the newer interview format where candidates work alongside an AI assistant.
Pricing
The Curious plan is free, with 7 exercises per month and no card required. Paid access is sold as one-time 30-day passes with no auto-renewal: Starter $10, Serious $18 (adds AI mock interviews), Focused $30, and Relentless $60. The AI-assisted coding round pack is sold separately as a one-time purchase with no expiry. Payment is via Razorpay or PayPal. Pricing details are based on the official website; prices may change, so check prepd.tech for the latest.
Information based on the official Prepd website, checked November 3, 2026.
