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How do you decide what to automate or what to build from scratch?

General/Othereasy0.2 min readPremium
Frequency
Low
Asked at 1 company
Category
243
questions in General/Other
Difficulty Split
151E|43M|49H
in this category
Total Bank
1,863
across 7 categories
Asked at these companies
Netflix
Expert AnswerPremium
45 wordsInterview-ready
**Framework**: (1) Frequency—recurring = automate; one-off = manual; (2) Complexity—simple/stable = automate; (3) ROI—effort vs time saved; (4) Existing tools—managed/OSS before custom; (5) Maintenance cost. Rule: automate after 3rd repetition. Build vs buy: buy when fits + support; build when differentiation....
The complete answer continues with detailed implementation patterns, architectural trade-offs, and production-grade considerations. It covers performance optimization strategies, common pitfalls to avoid, and real-world examples from companies like Netflix. The answer also includes follow-up discussion points that interviewers commonly explore.

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