Backend Developer (Java, Spring Boot)
A Java backend developer builds services with Spring Boot: APIs, business logic, and the relational data underneath.
- Build REST services and validate requests
- Use JPA and SQL to read and write data
- Write unit and integration tests
- Run and monitor services in containers
- A Spring Boot REST API with JPA
- Tests for the service layer
- A containerised deployment
Where it leads: Senior backend engineer, then distributed systems and architecture.
Every skill, at the level the job needs
Updating… · change the level or company to see how it shifts
api-design
core- HTTP URL
- What are APIs
- Content Negotiation
- HTTP: HyperText Transfer Protocol
- HTTP messages
- Understand TCP / IP
sql
core- Relational DB theory
- Relational Data Model
- RDBMS Benefits and Limitations
- SQL and Databases
- NoSQL DBs
- Basics SQL
java
core- Basic Syntax
- Strings
- Calling methods
- Processing strings
- Lifecycle of a Program
- Operations on primitive types
spring-boot
core- Terminology
- Introduction to software architecture
- Why use Spring?
- Configuration
- Dependency injection
- IoC Container
git-github
core- git init
- What is Version Control?
- Why use Version Control?
- git config
- Local vs Global Config
- Git
backend
core- HTTP: HyperText Transfer Protocol
- Domains
- DNS
- Browsers
- Frontend
- Why use Rust?
datastructures-and-algorithms
core- Introduction to Java
- Language Syntax
- Control Structures
- Pseudocode
- Pseudocode basics
- Functions
What the levels mean
- L1 · AwareKnows what it is and when it's used
- L2 · BasicsCan use it with guidance
- L3 · WorkingUses it independently on the job
- L4 · StrongHandles hard cases, reviews others
- L5 · ExpertDesigns with it, teaches it
Interviews, by kind of company
Your route adds an interview track that matches the company you choose.
Large IT services firms: aptitude, fundamentals, technical and HR rounds.
Online assessment, coding rounds, a design round.
Hard timed coding rounds, system design, behavioural interviews.
Questions
What does a Backend Developer (Java, Spring Boot) need to know?
API Design, Backend Developer, Java Developer, Spring Boot Developer, SQL Roadmap at a working level, plus Docker Roadmap, Learn Git and GitHub, Linux Roadmap. The skills section above lists every one with its level.
How long does it take to become a Backend Developer (Java, Spring Boot)?
About 336 hours of study from scratch. At 10 hours a week that's roughly 34 weeks; anything you already know is skipped after the readiness test.
I already know some of this. Do I start from zero?
No. The optional readiness test finds what you already know and your route skips it.
Does the route change for product companies or senior roles?
Yes. Choose your level and the kind of company above: the skills and target levels adjust, for example deeper data structures and system design for product companies.
Other roles in the Backend track
They share many skills with this one, so progress carries over if you switch.
APIs and services in Python with SQL databases.
APIs with Node.js and Express.
Fast, concurrent services in Go.
Services and APIs with C# and ASP.NET Core.