Top 3 tricky Interview questions

 2025: In this Code Decode video, we break down the top 3 tricky senior developer interview questions and their answers.

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Interview questions 

✅ What is a Cold Start in Spring Boot?

Understand why your app’s startup time can cause autoscaling failures, serverless timeouts, and production delays — and learn how to fix it.

✅ Real Cold Start Optimization Techniques:

Use of /actuator/startup to find bottlenecks

Enable lazy initialization

Exclude unused auto-configurations

Tweak DB and Liquibase setup

Use Spring AOT + GraalVM Native Image to reduce startup to lest than 1 second

✅ REST vs gRPC vs Event-Driven: What’s Best in 2025?

We explain:

When to use REST for simplicity

When to choose gRPC for speed

Why event-driven architecture is the backbone of scalable, decoupled systems

Real-world hybrid strategies that work in production

✅ Handling Breaking API Changes in Microservices

Learn how to implement:

API versioning

Separate DTOs for v1/v2

Feature toggles

Contract testing (Spring Cloud Contract)

Safe rollout and deprecation strategies

✅ Dealing with Large File Uploads in Spring Boot

Avoid memory bloat with streaming

Secure your uploads with size limits, antivirus, and safe naming

Scale to 100MB+ using pre-signed URLs (e.g., S3)

Offload heavy processing to background queues (Kafka, RabbitMQ)

🚨 Plus:

We cover the top 10 real production issues in Spring Boot microservices — from memory leaks, thread pool exhaustion, and cascading failures to logging, observability, and retry nightmares — with proactive fixes you can apply today.

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