Manpower Belgium Software Engineer interview experience: hashmap and Spring Boot

The first round felt strong and deeply technical. I was asked how a hashmap works internally, how I would handle a race condition, what rehashing means, and why Spring Boot differs from the broader Spring framework. Another stage went further into Java and backend work: Java, Spring Boot, microservices, REST APIs, SQL, and system design. We also discussed my projects, problem-solving approach, an…

Shared by a candidate · reported Jul 2026. Interview formats change; use it as a guide, not a script.