Which Programming Language Is Best for Getting a Job at Google?
Google does not hire for a programming language. The coding interview lets you use the language you know best, and Google's own interview guidance says to know one language well, with C++, Java, Python, Go, or C preferred. Inside the company, the largest codebases are in C++, Java, Python, Go, and TypeScript, and a new hire is expected to learn whichever one their team uses. So the best language for getting a job at Google is the one in which you can write correct code fastest inside a 45 minute round. For most candidates, that is Python, Java, or C++.
Which Language to Use in the Google Coding Interview
The interviewer grades correctness, complexity, code quality, and how clearly you explain your reasoning. The language affects only how fast you can express the solution. Three languages cover most Google loops.
| Language | Why candidates choose it | What to watch |
|---|---|---|
| Python | Shortest code; lists, dicts, heaps, and sorting are built in | Know the complexity of every built-in you call |
| Java | Strong typing makes intent clear; the standard collections cover interview needs | Verbose; practice writing it without an IDE |
| C++ | The STL has every container an interview needs | Pointer and memory mistakes cost time |
| Go, JavaScript, Kotlin | Accepted; sensible when it is your daily language | Fewer built-in structures, so you may write a heap by hand |
Two rules apply whatever you choose. Use the language you write every day, because a language learned last month fails under time pressure. Do not switch languages between the phone screen and the onsite.
The online assessment that precedes some loops accepts the same languages. Its format is described in what the Google Online Assessment is.
What Programming Languages Google Uses Internally
Google keeps most of its code in one shared repository and supports a short list of languages in it. That list answers the "what is Google written in" question.
C++ runs the performance-critical systems: web search serving, the Bigtable and Spanner storage systems, and the Chrome browser.
Java runs many large backends, including much of Gmail and the Ads systems, and is one of the two official Android languages.
Python is used for tooling, data analysis, and machine learning research. The public interface of TensorFlow is Python.
Go was created at Google for infrastructure and is the language of Kubernetes and of much of Google Cloud's tooling.
JavaScript and TypeScript run the web frontends. Angular, Google's web framework, is written in TypeScript.
Kotlin is the preferred language for new Android app code, and Dart is the language of the Flutter user interface toolkit.
A new hire is not expected to know the team's language on day one. Google runs an internal certification called readability, in which an experienced engineer confirms that you write the house style of a language before your changes can be submitted without a second reviewer for that language.
Programming Languages Created by Google
Google created Go, a compiled language for servers and tools. It created Dart, the language behind Flutter. It also created Carbon, an experimental successor to C++, and Sawzall, an older language for log processing that is no longer in use. Kotlin is often listed here in error. JetBrains created Kotlin, and Google adopted it for Android.
How Google Grades the Code, Not the Language
An interviewer writes feedback in four areas. Is the solution correct? Is its time and space complexity the best available? Is the code readable? Did you explain your reasoning? None of the four names a language. A clean Python solution with the right complexity scores higher than a clumsy C++ one, and the reverse is also true.
The language has one indirect effect. Candidates who use a language with rich built-ins spend less of the 45 minutes on boilerplate and more on the harder follow-up question. That is the main argument for Python and Java. The questions themselves are collected in the top coding interview questions for Google.
Which Language to Learn First for a Google Job
If you are choosing now, pick by the role. For a general software engineer role, learn Python or Java to interview depth, which means you can implement a heap, a trie, and a graph search from memory. For infrastructure or Cloud roles, add Go. For Android, add Kotlin. For frontend, add TypeScript.
Learn one language deeply before a second. Google hires for depth of understanding, not for the length of the language list on a resume. The interview-specific comparison is in which language is best for the Google coding interview.
How to Prepare
- Practice with Google's own question style. Google questions are usually one known pattern with a twist in the follow-up. Grokking the Google Coding Interview works through them in that form.
- Learn patterns, not problems. Sliding window, two pointers, and graph search cover a large share of what Google asks. Grokking the Coding Interview teaches the patterns in Python, Java, C++, and other languages.
- Rebuild the data structures by hand once. Writing a heap and a trie yourself in your chosen language removes the fear of a question that needs one. Grokking Data Structures for Coding Interviews covers each one.
- Settle the language choice at least two months out. Every practice problem after that point should be in the language you will interview in.
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