30 Days to a Java Backend Offer with Zuber

(until Day 18 its completed other days are yet to be updated)

Days 1–8 — Core Java & JVM

Java fundamentals, Collections, Streams, JVM memory, GC, concurrency and interview-focused concepts.

Days 9–13 — Spring & Spring Boot

IoC, DI, bean lifecycle, REST APIs, validation, exception handling and common production issues.

Days 14–16 — Microservices

Service communication, API Gateway, resilience, distributed systems and real-world trade-offs.

Days 17–19 — Kafka

Producers, consumers, partitions, offsets, consumer groups, retries and event-driven architecture.

Days 20–21 — AWS

Core AWS concepts relevant to Java backend developers and cloud-native applications.

Day 22 — Docker

Containers, Dockerfiles and running Spring Boot applications with Docker.

Day 23 — CI/CD

Build, test and deployment fundamentals.

Days 24–25 — Testing

JUnit 5, Mockito, integration testing and Testcontainers.

Days 26–27 — SQL

Queries, joins, grouping, subqueries, CTEs, window functions and interview problems.

Day 28 — Production Debugging

Learn how to approach real backend issues using logs, metrics, stack traces and database investigation.

Day 29 — Interview Revision

100+ questions covering the key topics from the sprint.

Day 30 — Mock Interview Day

10 interview rounds covering Java, Spring Boot, Microservices, Kafka, SQL and System Design, followed by a readiness checklist.

By the end, you should have a structured revision path covering the core areas expected from a Java backend developer with 2–5 YOE.