Why are technical coding interviews so hard?

Technical coding interviews can indeed be challenging for many candidates. The perceived difficulty arises from a combination of factors related to the nature of the problems posed, the interview environment, and the skills being tested. Let's explore why these interviews are often seen as hard:

1. Complex Problem-Solving Under Time Constraints:

• Challenging Problems: The problems given in coding interviews often involve complex algorithms and data structures, requiring deep understanding and analytical skills.
• Time Pressure: Solving these problems under the pressure of a ticking clock adds to the challenge, as it can be hard to think clearly and quickly.

2. Testing a Wide Range of Skills:

• Broad Knowledge Base: Candidates are expected to have a strong grasp of various computer science concepts, from basic programming to advanced algorithms and system design.
• Application of Theory: It’s not just theoretical knowledge that's tested; you need to apply this knowledge to solve practical, often abstract problems.

3. The Need for Optimal Solutions:

• Efficiency Matters: It’s not enough to just solve the problem; solutions are often expected to be optimal in terms of time and space complexity.
• Code Quality: Interviewers also assess the readability, maintainability, and scalability of your code.

4. Unfamiliar Interview Format:

• High-Stress Environment: The interview setting can be intimidating, and the stress can affect performance, especially for those not accustomed to coding “on the spot”.
• Communication Skills: Candidates must not only code but also articulate their thought processes, decisions, and trade-offs clearly.

5. Psychological Factors:

• Fear of Failure: The high stakes of these interviews, especially when interviewing with major tech companies, can amplify nervousness and self-doubt.
• Impostor Syndrome: Many candidates, regardless of their actual skill level, suffer from impostor syndrome, feeling like they aren’t good enough.

6. Variation in Interviewer Style:

• Subjectivity: The experience can vary widely depending on the interviewer's style and expectations, leading to an unpredictable and sometimes inconsistent interview process.

7. High Competition:

• Standards are High: Given the competitive nature of tech jobs, especially in top companies, the bar is set high, and interviews are designed to identify the best talent.

Strategies for Success:

1. Practice and Preparation: Regular practice with a wide range of problems helps build familiarity and confidence.
2. Mock Interviews: Simulate interview conditions to get accustomed to the format and pressure.
3. Study Fundamentals: Ensure a strong grasp of computer science fundamentals.
4. Stay Calm and Positive: Develop strategies to manage stress and maintain a positive mindset.

In summary, technical coding interviews are tough because they aim to rigorously test a candidate's coding skills, problem-solving abilities, and theoretical knowledge, all within a limited time and often under stressful conditions.