Demanding and time-consuming hiring process with limited feedback What was good: 1. The initial conversation with the recruiter was positive and professional. 2. The technical task was relevant to the role and based on their actual codebase. 3. I appreciated the opportunity to improve the solution after submission. What to be aware of: 1. Unrealistic time estimate: The task was said to take ~3 hours, but in reality, it required much more. Understanding their internal codebase, custom DSL, and crypto domain logic took several hours by itself. Completing and polishing the solution took 8–12 hours total. 2. Task revisions required: After submission, I received feedback asking for improvements and refactoring. I fixed the key issue and quickly resubmitted the solution. 3. Slow and inconsistent communication: I was told to expect feedback by the end of the day, but received a response only a week later, after following up. 4. No chance to talk to engineers: Despite fixing the only major issue they mentioned, I was rejected without being invited to a technical interview. 5. Lack of actionable feedback: The final response was vague and high-level, with no specific examples or opportunity for technical discussion, making it difficult to understand what went wrong and how it could be improved. General impression: The process requires a significant time investment (unpaid) and prioritizes perfection in a complex domain over evaluating core engineering and problem-solving skills. Combined with delayed communication and limited feedback, it felt unbalanced and discouraging.