Estimating time complexity before coding is crucial for developers, especially during interviews. This practice helps avoid Time Limit Exceeded (TLE) errors and demonstrates structured thinking. Interviewers expect candidates to reason from constraints first, choose an appropriate algorithm, and explain their choices.

A pre-coding checklist, which involves mapping constraints to allowable complexities, is essential. For instance, understanding that `n` <= 1e5 usually implies `O(n log n)` rather than `O(n^2)` is key. This approach helps in selecting the right algorithm class, which is a sign of senior-level judgment.

Developers are advised to glance at constraints, translate them into complexity requirements, and dry-run small examples to verify their approach. This method not only prevents TLEs but also showcases a mature and organized mindset, which is highly valued in the industry. Additionally, tools like LeetCopilot can assist in validating planned complexities, ensuring that the chosen algorithm is efficient and effective.