TCS interviews are moderately challenging, with a strong emphasis on core DSA and problem-solving. Typically, allocate 8-12 weeks for preparation, solving 200+ LeetCode problems focusing on medium and hard difficulties. Practice with TCS-specific tagged questions to understand the common patterns and difficulty level.

Prioritize arrays, strings, linked lists, trees (binary, BST), graphs, and dynamic programming. TCS often tests string manipulation, tree traversals, and graph algorithms. Ensure you can implement these in Java or Python, as these are commonly used, and practice coding without an IDE to simulate interview conditions.

Avoid starting to code without clarifying problem constraints and edge cases. Another mistake is not optimizing brute-force solutions; always discuss time and space complexity. Communicate your thought process aloud, test with examples, and ensure clean, error-free code to demonstrate proficiency.

Highlight projects with tangible outcomes and quantifiable impact, linking them to TCS's focus on innovation. Prepare behavioral responses using the STAR method, emphasizing adaptability and teamwork—key at TCS. Showcase any experience with agile practices, cloud technologies, or TCS's core domains like digital transformation.

After applying, expect an online assessment within a week, followed by technical and HR rounds over 2-4 weeks. Final offers may take 1-2 months due to high volume. If no response, follow up politely after 10-14 days via email, but remain patient as TCS processes numerous applications.

SDE-1 interviews test fundamental DSA and coding skills; SDE-2 adds basic system design and complex algorithmic problems; SDE-3 focuses on large-scale architecture, distributed systems, and leadership. Tailor preparation: for SDE-2/3, study scalability, databases, and design patterns relevant to TCS projects.

Use LeetCode with TCS company tags for targeted coding practice. Refer to 'Cracking the Coding Interview' for concepts and 'Designing Data-Intensive Applications' for system design. Also, explore TCS's career blogs for insights, and take mock interviews on platforms like HackerRank or Pramp to simulate real rounds.

TCS emphasizes collaborative teamwork, continuous learning, and agile methodologies. New hires are expected to be proactive communicators, adaptable to client projects, and committed to upskilling. Understand TCS's focus on digital services and be prepared for a structured onboarding with mentorship and performance-driven growth.