Describe the most difficult or unsuccessful project you participated in, and tell about the problems you faced.

In one of the projects, I participated in the development of a big data processing system, where I encountered several problems:

• Unclear requirements: the client often changed requirements, which led to constant rework of the architecture.
• Performance issues: the initially chosen technologies could not handle the volume of data, so I had to optimize algorithms and use more efficient tools.
• Team communication: the distributed team had difficulties with synchronization, which slowed down the development process.

These problems taught me the importance of clear task setting, choosing appropriate technologies, and effective communication within the team.