Intern – Software Engineer, Legacy Systems (Hybrid: Onsite & Remote)
Posted Sep 1, 2026 · We last checked this listing on Oct 6, 2026
Likely interview questions for this role
Written from this job description, not a generic list. Each one notes what the interviewer is really checking.
About your past
Tell me about a time you had to learn something that felt outdated or difficult. How did you approach it?
What they are checking: Willingness to learn unglamorous but important skills with a positive attitude.
How do you ask experienced engineers for help without taking too much of their time?
What they are checking: Respectful, prepared questions that show they tried first, which builds trust with senior staff.
What would you want to learn from a summer working on legacy systems?
What they are checking: Genuine motivation for the role rather than seeing it as a lesser internship.
What would you do
You need to change code you did not write and that has no documentation. How do you start?
What they are checking: A careful approach of reading, tracing and testing before changing anything in a critical system.
How would you document what you learn about a legacy system so the next person has an easier time?
What they are checking: Habit of leaving things better than they found them, which legacy teams value.
About the work
What do you think makes working on legacy systems different from building something new?
What they are checking: Understanding that legacy work means care, testing and respect for systems the business still runs on.
Have you worked with older languages or platforms like COBOL, mainframes or older Java? How do you feel about learning them?
What they are checking: Openness and honest experience with the technologies legacy systems often use.
Why might a company keep an old system running instead of replacing it right away?
What they are checking: Business awareness of cost, risk and reliability tradeoffs in modernization.
How would you make sure a small change does not break something else in an old system?
What they are checking: Awareness of regression testing and the risk of hidden dependencies in older code.
Explain how you would debug a batch job that produced wrong totals overnight.
What they are checking: Methodical debugging using inputs, logs and step-by-step checks in a batch process.
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As published by US Foods.