Lessons from a 2020 intern assignment

In June 2020, Cloudflare doubled the size of its Summer intern class due to a huge influx of students interested in their engineering internships. The company sent out a take-home project for applicants, which involved building an A/B test application using their serverless product, Cloudflare Workers. This exercise was designed to gauge candidates' experience with JavaScript and the Workers APIs. Applicants were also encouraged to explore wrangler, a command-line tool used to deploy Workers applications. Extra credit sections of the project involved changing contents on the page using Workers APIs, persisting variants, and deploying to a domain that they owned. The most common mistakes made by applicants included writing unclean code, rushing through the exercise without ensuring the base implementation was working correctly, misunderstanding or incorrectly implementing the solution, and excessive bandwidth usage.