Freelance Java Spring Boot developer jobs in 2026: where to find contracts, day rates, how to prepare
Where to find freelance Spring Boot contracts in 2026, current day rates across Europe, and how to prepare for technical interviews.
Spring Boot
BACKEND
Reference Java framework for backend offering intelligent auto-configuration and complete ecosystem for REST APIs, microservices and reactive applications. Modular architecture with Spring Data JPA, Spring Security, and Spring Cloud for cloud-native apps.
What you'll learn
Intelligent auto-configuration and ready-to-use starters
Spring MVC & REST for modern APIs with validation
Spring Data JPA with Hibernate for persistence
Spring Security with JWT, OAuth2 and advanced authentication
Comprehensive testing (JUnit, Mockito, @SpringBootTest, slices)
Actuator for production monitoring and metrics
Reactive programming with WebFlux (Mono/Flux)
Microservices and Spring Cloud (Config, Discovery, Gateway)
Transactions, caching (Redis, Caffeine) and async/scheduling
Docker containerization and GraalVM native images
Key topics to master
The most important concepts to understand this technology and ace your interviews
1
Spring Core: IoC, Dependency Injection, beans and scopes
2
Auto-configuration, starters and configuration (properties/YAML)
3
Spring MVC, REST controllers (@GetMapping, @PostMapping, etc.)
4
Request/response handling (@PathVariable, @RequestBody)
5
Bean Validation and exception handling
6
Spring Data JPA: entities, relationships, repositories and queries
7
Spring Security: authentication, authorization, JWT, OAuth2
8
Transactions (@Transactional), propagation and isolation
9
Testing: unit tests (Mockito) and Spring Boot tests
10
Actuator, logging (SLF4J/Logback) and monitoring
11
Caching with @Cacheable, providers (Redis, EhCache)
12
Async (@Async), scheduling (@Scheduled) and events
13
WebFlux and reactive programming (Mono, Flux)
14
Microservices: Spring Cloud Config, Service Discovery, API Gateway
15
Performance, optimization, Docker and GraalVM native images
Today's Spring Boot challenge
One snippet a day. Find the bug, or prove there isn't one.
686 Spring Boot postings online
Permanent and freelance, with country, remote and salary when it is published. Updated every day, reserved for subscribers.
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