45-day interview roadmap

5+ years · Product · Product companies · 5+ years

45-Day Product-Based Company Roadmap (5+ years)

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3 min read August 1, 2026

45-day plan — 5+ years · Product

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Day 1–9 Foundations & Core Java
Day 10–19 DSA & database
Day 20–30 Spring, REST & messaging
Day 31–39 System design & cloud
Day 40–45 Delivery & interview prep

Curriculum

Phase 1: Programming Foundations (Day 1–4)

Day 1 – Programming Foundations

Topics

Java syntax refresh
OOP
SOLID
Design principles

Day 2 – Programming Foundations

Topics

Clean Code
Exception handling
Generics

Day 3 – Programming Foundations

Topics

Reflection
Annotations
Serialization
Records
Sealed classes

Day 4 – Programming Foundations

Topics

Virtual Threads
Project Loom
Java 8–21 features

Phase 2: Core Java (Day 5–9)

Day 5 – Core Java

Topics

Collections Internals
JVM Architecture

Day 6 – Core Java

Topics

Memory Management
Garbage Collectors
Class Loading

Day 7 – Core Java

Topics

JIT Compiler
Escape Analysis
String Pool

Day 8 – Core Java

Topics

Concurrency
Locks
Atomic Classes

Day 9 – Core Java

Topics

CompletableFuture
Fork Join
Executor Framework

Phase 3: DSA (Day 10–15)

Day 10 – DSA

Topics

Arrays
Strings
Linked List

Day 11 – DSA

Topics

Stack
Queue
Heap
Tree

Day 12 – DSA

Topics

Trie
Graph
Union Find

Day 13 – DSA

Topics

Segment Tree
Fenwick Tree

Day 14 – DSA

Topics

Dynamic Programming
Backtracking

Day 15 – DSA

Topics

Greedy
Sliding Window
Binary Search
Bit Manipulation
Interview patterns
Top 200 problems

Phase 4: Database (Day 16–19)

Day 16 – Database

Topics

SQL
Advanced SQL
Query Optimization

Day 17 – Database

Topics

Indexing
Partitioning
Sharding
Replication

Day 18 – Database

Topics

Transactions
Isolation Levels
MVCC
Deadlocks
Locking

Day 19 – Database

Topics

Stored Procedures
Views
Triggers
NoSQL
MongoDB
Cassandra
Redis

Phase 5: Spring Framework & Boot (Day 20–25)

Day 20 – Spring Framework

Topics

Spring Core
Bean Lifecycle
IoC
Dependency Injection
AOP

Day 21 – Spring Framework

Topics

Spring MVC
Validation
Profiles
Events
Scheduling
Async

Day 22 – Spring Boot

Topics

Auto Configuration
Starters
Configuration
Logging
Actuator

Day 23 – Spring Boot

Topics

Monitoring
Health Checks
External Configuration
Profiles
Production Best Practices

Day 24 – Spring Data JPA & Hibernate

Topics

ORM
Entity Lifecycle
Persistence Context
Dirty Checking

Day 25 – Spring Data JPA & Hibernate

Topics

Fetch Strategies
N+1
Caching
Locking
Specifications
Pagination
Criteria API
QueryDSL
Performance

Phase 6: REST & Microservices (Day 26–28)

Day 26 – REST API Design

Topics

REST
Versioning
Pagination
Filtering
Sorting
HATEOAS
Validation
Error Handling
Idempotency
Rate Limiting
OpenAPI
Swagger

Day 27 – Microservices

Topics

Discovery
Gateway
Configuration
Feign
Resilience4j
Circuit Breaker
Retry
Bulkhead

Day 28 – Microservices

Topics

Saga
CQRS
Event Sourcing
Distributed Transactions
Idempotency
Service Mesh
gRPC

Phase 7: Messaging & Caching (Day 29–30)

Day 29 – Messaging

Topics

Kafka
RabbitMQ
ActiveMQ
Producer
Consumer
Consumer Groups
Partitioning
Delivery Semantics
DLQ
Kafka Streams

Day 30 – Caching

Topics

Redis
Local/Distributed Cache
Cache Patterns
Eviction
Write Through
Write Back
Stampede
Bloom Filters

Phase 8: System Design & LLD (Day 31–35)

Day 31 – System Design

Topics

Scalability
CAP
Consistent Hashing
CDN
Load Balancer
Reverse Proxy

Day 32 – System Design

Topics

Database Scaling
Queue
Search
Storage
Distributed Locking
Rate Limiter

Day 33 – System Design

Topics

Notification
URL Shortener
WhatsApp
Uber
Netflix
YouTube
Payment Gateway
E-commerce
Ride Sharing
Chat Systems

Day 34 – LLD

Topics

SOLID
Design Patterns
UML
Parking Lot
Splitwise

Day 35 – LLD

Topics

Chess
Elevator
Hotel
Library
Food Delivery
ATM
Vending Machine

Phase 9: Cloud & Containers (Day 36–39)

Day 36 – Cloud

Topics

AWS
EC2
ECS
EKS
Lambda
S3
RDS
IAM

Day 37 – Cloud

Topics

VPC
CloudWatch
API Gateway
SNS
SQS

Day 38 – Docker & Kubernetes

Topics

Docker Internals
Images
Containers
Networking
Compose

Day 39 – Docker & Kubernetes

Topics

Kubernetes Architecture
Pods
Services
Deployments
ConfigMaps
Secrets
Ingress
Autoscaling

Phase 10: Delivery & Production (Day 40–45)

Day 40 – CI/CD

Topics

Git
GitHub
Jenkins
GitHub Actions
Maven
Gradle
SonarQube
Nexus
Pipelines

Day 41 – Observability

Topics

Logging
Logback
ELK
Loki
Prometheus
Grafana
OpenTelemetry
Jaeger
Tracing
Metrics
Alerts

Day 42 – Security

Topics

Spring Security
OAuth2
JWT
OIDC
CSRF
CORS
OWASP Top 10
SQL Injection
XSS
Secrets Management

Day 43 – Performance Engineering

Topics

JVM Tuning
Profiling
Memory Leaks
CPU Bottlenecks
Thread Dumps
Heap Dumps
GC Tuning
JMeter
Load Testing

Day 44 – Testing

Topics

JUnit
Mockito
Testcontainers
Integration
Contract
Performance
Mutation Testing

Day 45 – Production Capstone

Topics

Operating Systems
Computer Networks
Behavioral & Leadership
Production Engineering
End-to-End Production Project

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