Hire Spring developers to build and scale your software.

There is no single rate for Spring developers. Cost depends on the seniority you need, the engagement model you choose (adding developers to your team, a dedicated team, or a fixed-price project), how long the engagement runs and the scope of the work. For Spring work, the biggest drivers are the Spring Boot and Java versions you are starting from, how many services and shared libraries must be upgraded together, and the security and compliance requirements around authentication and data access. Share your requirements and we will come back with a quote for your situation.

You tell us the technology, seniority, role and team structure you need. We recommend Spring developer profiles that match those requirements, and you review the profiles and speak with the engineers yourself before anyone joins your team. When you interview, the areas worth testing are auto-configuration, profiles and externalized configuration; the javax to jakarta migration and Spring Boot 3 upgrade path; securityFilterChain setup and OAuth2 resource server configuration; transaction boundaries and propagation with @Transactional; choosing between Spring MVC, virtual threads and WebFlux; and slice tests and Testcontainers-based integration tests.

It depends on which engineers with the right skills are available when you get in touch, so we do not publish a fixed start date. Availability is part of the conversation when we recommend profiles, and the start date is agreed with you before the engagement begins.

Because you interview the engineers before anyone joins, fit is tested before work starts. If concerns come up once the engagement is running, raise them with us directly. How changes to the team are handled is set out in the terms you agree with us at the start.

A freelancer suits small, well-defined tasks you can manage yourself. A dedicated developer joins your team under your direction. A dedicated team adds several roles around your product, and a project-based team delivers a defined outcome end to end.

Spring Boot 3 requires Java 17 or later and moves from javax to jakarta package names, so imports, servlet filters and many libraries must change together. Teams typically upgrade to the last 2.x release first, clear deprecation warnings, then use automated recipes such as OpenRewrite for the namespace switch before testing thoroughly.

Spring MVC remains the right default for most services, especially those using JPA and blocking JDBC drivers. WebFlux suits streaming, gateway and high-connection workloads where the whole stack, including database drivers, is non-blocking. With virtual threads available on modern Java, MVC now handles many concurrency needs that once pushed teams toward reactive code.

Current Spring Security uses a SecurityFilterChain bean rather than the removed WebSecurityConfigurerAdapter. A typical API acts as an OAuth2 resource server validating JWTs from an identity provider, with method-level rules via @PreAuthorize. CORS, CSRF and session policy are set explicitly so behavior is clear instead of inherited from defaults.

Where it adds value. Spring Cloud Config, Gateway and OpenFeign clients help on self-managed platforms, while on Kubernetes some concerns such as service discovery are better handled by the platform itself. We pick components based on where the services run rather than adopting the whole suite.

With a mix of plain unit tests, slice tests such as @WebMvcTest and @DataJpaTest, and a smaller number of full integration tests. Testcontainers runs real PostgreSQL, Kafka or Redis instances in tests, so database-specific behavior is caught before deployment rather than after.

Yes. Spring has first-class Kotlin support, including null-safety annotations, coroutines in WebFlux and Kotlin DSLs for configuration. Java and Kotlin classes can live in the same project, so teams can adopt Kotlin for new code without rewriting existing modules.

Spring Boot Actuator exposes health, metrics and info endpoints, and Micrometer exports metrics and traces to tools such as Prometheus, Grafana or an OpenTelemetry collector. Custom business metrics are added alongside the defaults, so dashboards show order or payment flow as well as JVM health.