Should Coding Interviews be Conducted in a Specific Language or Pseudo-Code?

The decision between using a specific programming language or pseudo-code in coding interviews is multifaceted and influenced by several factors including the goals of the interview, the candidate's background, and the specific role they are applying for. This article explores the pros and cons of both approaches and suggests best practices for conducting effective interviews.

Using a Specific Programming Language

Pros:

Real-World Application: Candidates demonstrate their proficiency in a language relevant to the job, which is crucial for assessing their practical skills. Syntax Familiarity: Candidates can show their understanding of language-specific features, libraries, and idioms, providing a deeper insight into their coding expertise. Immediate Feedback: Interviewers can immediately see how candidates handle language-specific issues such as type errors or syntax mistakes, helping to gauge their coding ability in real-time.

Cons:

Language Bias: Candidates may excel in one language but struggle in another, which may not reflect their overall coding ability. Nervousness: The focus on syntax and language specifics may divert candidates' attention from problem-solving, increasing their anxiety and impacting their performance.

Using Pseudo-Code

Pros:

Focus on Logic: Candidates can concentrate on problem-solving and algorithm design without being bogged down by syntax, allowing for a more focused discussion on their solution approach. Language-Agnostic: Candidates from diverse backgrounds can express their ideas without being restricted by their language proficiency, leveling the playing field. Clarity of Thought: Pseudo-code can help clarify the candidate's thought process and approach to solving a problem, making the interview more transparent and insightful.

Cons:

Lack of Practicality: Pseudo-code may not fully reflect how solutions would be implemented in a real-world scenario, potentially leading to a disconnect between theoretical and practical skills. Ambiguity: Different interpretations of pseudo-code can lead to misunderstandings between the candidate and the interviewer, affecting the clarity and effectiveness of the discussion.

Best Practices

Hybrid Approach: Consider starting with pseudo-code to outline the solution and then asking candidates to implement it in a specific language. This approach allows for the evaluation of both their problem-solving skills and their coding proficiency, providing a well-rounded assessment.

Context Matters: Tailor the approach based on the role. For example, if hiring for a backend developer position in a specific language, prioritize that language during the interview to ensure a relevant and practical assessment.

Clear Expectations: Communicate clearly with candidates about what is expected in terms of language or pseudo-code to minimize confusion and ensure a fair and effective interview process.

Ultimately, the choice between using a specific language or pseudo-code should align with the objectives of the interview and the skills being assessed. By considering these factors and adopting best practices, interviewers can conduct effective and fair interviews that truly evaluate a candidate's coding potential.