Can You Use Common Lisp in Google Internship Interviews?

Google internship interviews are rigorous affairs designed to evaluate your skills in data structures, algorithms, and problem-solving. Most candidates are expected to choose from a variety of mainstream programming languages such as Python, Java, and C, which are widely used in industry. However, the flexibility to use Common Lisp raises interesting questions for many candidates. Let’s explore the extent of this flexibility and the considerations involved.

The Scope of Common Lisp Use in Google Interviews

While it is indeed possible to use Common Lisp in Google internship interviews, there are significant factors to consider. The most common programming languages used in Google intern interviews are Python, Java, and C. However, candidates are given some leeway to choose their preferred language, provided it meets the requirements and standards set by the interviewers.

It's essential to check the specific guidelines provided by Google. The interview format and language options can vary depending on the role and the specific interview round. If you decide to use Common Lisp, ensure that it is allowed during your interview. Here’s a breakdown of the considerations:

Role-Specific Considerations

The choice of programming language can be influenced by the role you are applying for. For specialized positions that require extensive coding in Lisp, such as those involved with flight search products, Common Lisp would be a necessity. In such cases, you will likely encounter interviewers who are knowledgeable about the nuances of Common Lisp.

For a “generic” Software Engineer role, the likelihood of using Common Lisp is low, particularly since it is not a commonly used language at Google. The practical challenge of finding a panel of interviewers fluent in Common Lisp makes it less likely to be a choice unless you are applying for a specialized position involving Lisp.

Even in roles that don't strictly require programming skills, such as TPM (Technical Program Manager) or SRE (Site Reliability Engineer) positions, there is a chance that you might be required to demonstrate your coding skills. In these cases, proficiency in a less common language like Common Lisp might impress the interviewers but could also raise barriers due to the scarcity of experienced interviewers familiar with this language.

Encouragement to Use Preferred Languages

In many cases, Google encourages candidates to use their preferred programming language. This is because they want to see your actual skills and performance rather than your familiarity with their preferred tools. However, they also ensure that their interview process is fair and consistent across different languages and technologies.

As of the latest knowledge, the only significant use of Common Lisp in Google's production environment was by ITA Software, which handles flight search products. Given this historical context, it is reasonable to assume that if Common Lisp is used in the interview, it will be a rare occurrence.

Impressions and Insights

Using Common Lisp in an interview can be an impressive display of your coding versatility and proficiency. However, it’s crucial to balance this with practical considerations. While you might impress interviewers with your Lisp skills, it could also work against you if the interviewers struggle to follow your code or understand your approach.

Many candidates have reported that their use of Common Lisp did not significantly impact their chances of getting an offer. Nonetheless, being prepared to explain your choice and the benefits of Lisp in the context of the problem can help mitigate any potential drawbacks.

Conclusion

While it's possible to use Common Lisp in Google internship interviews, the decision should be carefully considered based on the role, your comfort level, and the interviewers' expertise. Flexibility and clear communication about why you've chosen a non-mainstream language can help you navigate the challenges of an interview process that typically relies on common languages.