Back End Engineer Interview Questions

1,086 back end engineer interview questions shared by candidates

¿Qué es la programación orientada a objetos (OOP) en Java? ¿Qué diferencias hay entre == y .equals() en Java? ¿Qué es una clase interna o anónima en Java? ¿Qué son las expresiones lambda en Java? Da un ejemplo. ¿Qué es una interfaz funcional? ¿Qué paradigmas incorpora Java desde la versión 8? ¿Qué patrones de diseño has utilizado?
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Java Back-end Developer

Interviewed at NTT DATA

3.7
Sep 17, 2025

¿Qué es la programación orientada a objetos (OOP) en Java? ¿Qué diferencias hay entre == y .equals() en Java? ¿Qué es una clase interna o anónima en Java? ¿Qué son las expresiones lambda en Java? Da un ejemplo. ¿Qué es una interfaz funcional? ¿Qué paradigmas incorpora Java desde la versión 8? ¿Qué patrones de diseño has utilizado?

After submitting the assessment, the interviewers reviewed my implementation in detail. One of the main things they asked me about was the design decisions I made, particularly around: How I handled authentication and authorization, and why I chose a specific approach (e.g., JWT vs. session-based, role hierarchy). My microservice setup, especially how I structured inter-service communication and ensured decoupling. Security considerations, such as how I protected file uploads and prevented common vulnerabilities. They were especially interested in understanding my reasoning behind certain architectural choices and how I ensured scalability and maintainability.
avatar

Back End Developer

Interviewed at JK Tech

4.4
Jun 20, 2025

After submitting the assessment, the interviewers reviewed my implementation in detail. One of the main things they asked me about was the design decisions I made, particularly around: How I handled authentication and authorization, and why I chose a specific approach (e.g., JWT vs. session-based, role hierarchy). My microservice setup, especially how I structured inter-service communication and ensured decoupling. Security considerations, such as how I protected file uploads and prevented common vulnerabilities. They were especially interested in understanding my reasoning behind certain architectural choices and how I ensured scalability and maintainability.

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