Couchbase interviews are moderately difficult, with a strong emphasis on distributed systems and database concepts. Allocate 2-3 months for preparation, focusing on LeetCode (150+ problems), system design basics, and Couchbase's product knowledge. The coding rounds are similar to mid-level tech companies, but expect deep dives into scalability and data consistency.

Prioritize data structures, algorithms, and especially distributed systems topics like CAP theorem, sharding, replication, and NoSQL databases. Review Couchbase's architecture and features such as memcached, indexing, and query languages like N1QL. Practice coding in languages commonly used at Couchbase, like Java or Go.

Candidates often underestimate the behavioral round and fail to link their experiences to Couchbase's leadership principles. In technical rounds, they might skip discussing trade-offs in system design or not ask clarifying questions. Ensure you articulate your thought process clearly and relate solutions to real-world database scenarios.

Demonstrate genuine interest in Couchbase's technology by understanding their product stack and recent developments. Highlight experiences with scalable systems or database optimization. In behavioral questions, use the STAR method to showcase leadership and customer obsession, which are core to Couchbase's culture.

The process usually takes 4-6 weeks from initial screening to offer. After each round, feedback is collected within a week, but delays can occur due to committee reviews. Follow up politely after 10-14 days if you haven't heard back, and use the recruiter as a resource for updates.

SDE-1 focuses heavily on coding and data structures, with simpler system design questions. SDE-2 adds more complex system design and architectural discussions, expecting ownership of features. SDE-3 emphasizes leadership, scalability decisions, and mentorship, with deeper behavioral assessments tailored to senior impact.

Use LeetCode for DSA, focusing on medium/hard problems. Study system design through resources like 'Designing Data-Intensive Applications' and Couchbase's official documentation. Practice with mock interviews that simulate Couchbase's style, and review Glassdoor for recent interview experiences specific to the company.

Culture fit is crucial; Couchbase values collaboration, innovation, and customer-centricity. Expect behavioral questions assessing these traits. Research their core values, such as 'customer obsession' and 'invent and simplify,' and prepare stories that align with them. Show enthusiasm for their open-source contributions and community engagement.