bugfree.ai

bugfree.ai is a practice platform for software engineers preparing for system design and behavioral interviews. It combines a structured, problem-based approach (similar to LeetCode) with scenarios that mirror real interviews at top tech companies.

System design practice

Work through 150+ system design prompts, from a classic URL shortener to designing Instagram-style, high-scale services. Each problem includes guided breakdowns to help you build a repeatable approach:

• Functional requirements and constraints
• Trade-off analysis
• Architecture choices
• Component diagrams

Behavioral and data interviews

In addition to system design, bugfree.ai includes behavioral practice and a data interview section:

• 30+ behavioral questions on teamwork, leadership, and conflict
• Data interview practice focused on analytical thinking

AI mock interviews with feedback

A core feature is AI-led mock interviews with immediate feedback. The AI reviews how you structure answers, the depth of your reasoning, and the clarity of your explanations, then suggests specific improvements for real interview performance.