How do I approach Software Engineering Fundamentals interview questions?

Software Engineering Fundamentals questions require understanding of core concepts and practice. PracHub provides solutions with explanations to help you master software engineering fundamentals interviews.

What difficulty level is this interview question?

This is a hard difficulty Software Engineering Fundamentals question, commonly asked during Technical Screen rounds at Microsoft.

What role is this question designed for?

This question is commonly asked for Software Engineer candidates at Microsoft during technical interviews.

Explain OOP design and API rollout | Microsoft Interview Question

Explain OOP design and API rollout

Last updated: Apr 22, 2026

Quick Overview

This question evaluates object-oriented design and API release engineering competencies, covering identification of core domain objects, separation of orchestration from business rules, testability and extensibility of backend logic, and safe modification of public APIs including backward compatibility, versioning, testing, rollout, monitoring, and client communication, and it is categorized under Software Engineering Fundamentals. It is commonly asked because employers need assurance that engineers can both conceptually design maintainable, extensible systems and practically apply release processes and testing strategies to evolve public interfaces without disrupting clients.

Microsoft

Apr 7, 2026, 12:00 AM

Software Engineer

Technical Screen

Software Engineering Fundamentals

In one interview round, the discussion focused on practical backend engineering rather than pure algorithms.

Discuss both of the following:

You are asked to implement a new piece of business logic for an existing backend service using object-oriented design. How would you identify the core domain objects, define responsibilities, separate orchestration from business rules, and make the implementation testable and extensible?
You need to modify an existing public API that is already used by clients. What release process would you follow to ship the change safely? Cover backward compatibility, versioning, testing, rollout, monitoring, and communication with clients.

Solution

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