Software engineer interview problems

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Hearing your experience of resolving bugs explores several aspects of your skills including critical thinking and how well you handle stress and pressure. Example: "I received a bug report from our DevOps team about one of our databases being stressed from an expensive query being called excessively from the UI.

I first checked the logs to find out when the trouble started. This gave me the rough commit range in which the bug was introduced. I was able to reproduce the bug on the latest piece of code, but only in production. I ran a git bisect to isolate the specific commit that introduced the bug and pulled the branch. However, I was not able to reproduce the issue. I went to the UI to debug using the browser devtools.

Sourcemaps are not available in our production environment, so I had to map the minified JavaScript code to the source CoffeeScript code. I was able to determine that the offending method was being called on every page as opposed to the occasional call from a lesser-used specific feature.

I decided to deploy some distinct logging statements to ensure that I had correctly identified the method. My logging confirmed the connection. Businesses form software development teams to solve problems for real people. Unforeseen obstacles often present themselves in one form or another, requiring a conversation on how to best solve the problem. Employers want to know that you are able to clearly communicate these obstacles to non-technical stakeholders, ensuring all parties are fully informed when decisions are made.

The quality of software is often a matter of balancing scope, cost and time. That balance is a business decision as opposed to a technical one. Rather, I come up with some potential alternatives and present their impact on that balance. For example, if an impediment may significantly push delivery beyond what was projected, I might present an alternative that can meet the current timeline with much of the same scope but will likely diminish the quality and degrade the user experience.

This collaborative process ensures that all parties are confident in the final decision. Retention is a high priority for many employers.

Replacing a team member can be quite expensive in cost terms of recruitment and training time. Asking questions to ensure your interests and motivations align with that of the company can reduce the risk of losing you as a team member.

Example: "I was watching an interview with your CEO about your product that aims to disrupt the lending industry. Streamlining arduous tasks like loan applications has huge potential. I think the growth in this sector over the last year is a big indication of things to come. I see this as giving your company the competitive advantage in this space as the verifiable auditability will reduce compliance costs. Employers want to know that you are thinking beyond the technical aspects and aim to solve real-world problems.

This often comes down to identifying a metric to improve and creating a testable hypothesis of your expected project impact. Example: "Before a project is even started, success metrics are laid out. I will identify the key performance indicator KPI that we are hoping to impact and begin gathering information to formulate ideas.

These ideas are stated as a falsifiable hypothesis. Here are some additional questions grouped by category that you can practice answering in preparation for an interview:. Some questions you may face in a software engineer position interview are general. The purpose of these questions is to get to know more about your personality and how you could fit in the workplace culture, such as:. What were your main responsibilities in your previous job?

When was the last time you were in a crunch? What could have prevented the situation and what changed to avoid it in the future? Why should we hire you as a software engineer on our team?

What are your favorite software engineering books and why? How do you work independently and as part of a team? Which do you prefer?

What are your greatest strengths and weaknesses? Describe a time you overcame a non-technical obstacle at work. In addition to the general questions, a hiring manager could ask, you will likely also need to answer questions about your background and experience in the software engineering industry. These questions will allow you to elaborate more on the skills you have gained through your education and work experience.

Describe your process for completing a project from start to finish. What scaling issues have you had to deal with on past projects? How could it have been avoided and how did you solve it?

Tell me about a time that you had to collaborate with other people on your team or other teams to solve a complicated problem. Discuss things like:. For Web Crawler, we have to design a scalable service that can crawl the entire Web, and can fetch hundreds of millions of Web documents. Following are some resources that can help you prepare for software engineering interviews. If you have any feedback, reach out to me on Twitter.

Fahim is the co-founder of Educative. We are building the next generation interactive learning platform for software engineers and instructors. Learners learn by going through interactive courses.

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