Java Interviewer-Makakmayum @makakmayumjava
A Java+Microservices+System design interviewer's diary | I post scenario based questions asked in real interviews Joined May 2014-
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Discord cut its WebSocket traffic by 40% without adding a single server. It’s a masterclass in system design. Here’s the core problem, framed as a backend interview question you might actually get. You're building a real-time app like Trello. A shared dashboard is synced for…
Java Interview Scenario based question: You're using @autowired for field injection in your Spring project. It's simple and it works. @component public class UserService { @autowired private UserRepository userRepository; } Your team lead asks you to refactor this as…
Java/Backend Interview Question: How do modern apps keep you logged in without storing session data on the server? Meet JWTs (JSON Web Tokens)! →A compact, secure token that lets a server verify your requests without a database lookup every time. This makes apps fast,…
In Java interviews, you might be asked to give better options to HashMaps as they sometimes is not always the most performant or memory-efficient tool and can lead to subtle performance bottlenecks, memory leaks, and tricky bugs. Here are three powerful alternatives to HashMap…
In real world production code, using if-else condition becomes costly as one extra else could crash the application. Knowing proper replacements separates junior devs from seniors. if (paymentType.equals("creditcard")) { processCreditCard(payment); } else if…
Project Valhalla in Java: Heard about Project Valhalla? Not your typical after death heroes' meetup tale. Its a project set to revolutionize Java's performance! It introduces value types, allowing classes to behave like primitives. Wow!! What does this mean? This means massive…
Different versions of Java and their main features for any interview revisions. →Java 8 (2014) Introduced functional programming concepts, Lambdas and the Stream API, which totally changed how developers write code for processing collections. →Java 11 (2018 - LTS) The most…
In Java applications, one simple tweak can improve performance by 50x. @transactional public List<Order> getRecentOrders() { return orderRepository.findRecent(); } Do you find anything unusual here? Applying @transactional in a read/GET call. Worst part is by default,…
Java interview real incident based question: Scenario: When Green Tests Lead to Production Red Alerts You refactor a core part of your application—perhaps changing a package name or updating a dependency. Your entire test suite, filled with unit and integration tests, passes…
Java/backend scenario based question: Ever booked a flight, hotel, and car online, but the hotel fails? You wouldn't want to be stuck with a flight and car but no room! →The SAGA design pattern is your smart travel agent for microservices. It handles a sequence of operations…
System design is important for any Java/backend interview to get into well established companies. Once you know the thought process behind system design, it'll be easy to break down and design from scratch any scalable application. I am providing a blueprint to the thought…
In interviews we ask candidates if we want to build faster, more scalable Java/backend apps, what should be the priority approach. Well, caching is the answer. Crucial for reducing latency, cutting costs, and even enabling modern AI agentic architectures. → JCache, Java's…
A very frequent Java/backend interview scenario based question that one simply cannot ignore. Ever need to protect an API? 🤔 Scenario: Your login endpoint can only be hit 10 times per minute by a single user. → A simple approach is the Fixed Window Counter: count requests…
A high level scenario based question in Java/backend interviews related to Zero Downtime Migration that really tests a candidate's in depth knowledge related to migration. Scenario: Your application currently uses a users table with a single address column to store a user's…
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