The interview process started with a Hackerrank test. The questions included HTML/CSS/JavaScript, time complexity, and algorithms with average difficulty. The test of the last question that is given by Booking was wrong. I struggled a bit because I did not understand why my results are wrong. Input that was supposed to be correct was wrong. I realized that after 10 minutes. So, be careful with that! I passed the first part and got an email for the second phone interview with an HR. The interview was via an app called BlueJeans. It was so badly set up that another interviewer of Booking joined first (because HR provided the same link) and the HR was late for 5 minutes. I was so confused, and I thought he is the interviewer, and I started explaining myself. Then the HR woman joined and then we understood there is a problem. The other interviewer left, and I started explaining myself again. I was a bit nervous this time because of the things, and HR did NOTHING to calm me down or say no worries or sorry. She just waited for me to go on. She was so unprofessional and rude. Even though they returned to me, she said I don't have enough experience IN YEARS (She asked nothing technical). I said I still want to try my chance because I trust my knowledge. She just said no and asked me to try again after I get more experience. TL;DR: Overall, I got a very bad experience from a non-technical HR who did not even read my CV before.

. Data Structures & Algorithms Topics to cover: Arrays, Linked Lists, Stacks, Queues, Trees, Graphs, Heaps, Hash Tables, Tries. Algorithmic Techniques: Sorting, Searching, Dynamic Programming, Divide & Conquer, Greedy Algorithms, Backtracking. Complexity Analysis: Time and Space complexity (Big O notation). 2. Cloud Cloud Concepts: Cloud computing models (IaaS, PaaS, SaaS), Cloud providers (AWS, Azure, Google Cloud). Services: EC2, Lambda, S3, RDS, CloudFormation, CDK, Kubernetes. Deployment & Scalability: Autoscaling, Load balancing, Containers, Serverless architecture, CI/CD pipelines. 3. System Design Core Topics: High-level design, Low-level design, Designing scalable systems, Distributed systems, CAP theorem, Consistency, Availability, Partition tolerance. Architecture Patterns: Microservices, Monolithic, Event-driven architecture, CQRS. Tools: Databases (SQL, NoSQL), Caching (Redis, Memcached), Message Queues (Kafka, RabbitMQ). 4. Scalability Vertical vs Horizontal Scaling: When to use each approach. Load Balancing: Types (Round-robin, Weighted, etc.), Algorithms. Caching: Distributed caching systems, Strategies like cache eviction policies, Cache-aside pattern. 5. Behavioral Interview STAR Method: Situation, Task, Action, Result framework for answering questions. Leadership Qualities: Conflict resolution, Team collaboration, Problem-solving approach.