How to answer this Technical interview question about Scalability for Senior-Level Software Engineer?

How do you ensure the scalability of an application during the development process?

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Software Engineer

Technical

Asked at

Google

Difficulty :

Hard

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Explanation

This question assesses your understanding of designing scalable systems, a critical skill for building applications that accommodate growth. Recruiters want to see how you apply principles such as load distribution, database optimization, and modular design. A strong answer includes specific techniques and instances where you successfully designed for scalability. Avoid vague responses or failing to address both software and infrastructure aspects.

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Answer Example

I ensure scalability by designing modular architectures, using load balancers, and optimizing database queries. For instance, while developing a real-time messaging app, I implemented a microservices architecture and used NoSQL databases to handle spikes in traffic. This approach allowed the system to scale seamlessly, supporting 10 million concurrent users with low latency.

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