Online meeting with a technical recruiter. We discussed relevant work experience and the hiring process.

The next step is three online technical interviews, all on the same day:

• LeetCode-style interview with two questions
• System design interview
• Object-oriented programming design interview

Coin change: Find all combinations of coins https://leetcode.com/problems/coin-change-ii/

Postfix calculator: Evaluate given formula https://leetcode.com/problems/evaluate-reverse-polish-notation/

OOP: Design a Logger with several formats (JSON, XML) and writers (console, file). Use DEBUG, INFO, ERROR levels.

System Design: Implement a public transportation system:

• Buses send current locations.
• Riders choose routes.
• Riders get updates and alerts.
• Data analysts analyze traffic patterns.
• The system can suggest new routes based on historical data.