Certified Experts Java 21 / Spring Boot 3.3

Java & Spring Boot
Enterprise Java. Virtual Threads. Native Image.

We build Java 21 + Spring Boot 3 applications with virtual threads, GraalVM native compilation, and the full Spring ecosystem for enterprise-grade reliability.

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☕

Enterprise Java. Virtual Threads. Native Image.

✓ Spring Boot 3

✓ Spring Security

✓ Spring Cloud

✓ Reactive Spring

✓ Testing

What We Build

Every type of
java project

We build Java 21 + Spring Boot 3 applications with virtual threads, GraalVM native compilation, and the full Spring ecosystem for enterprise-grade reliability.

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🏢

Enterprise APIs

Spring Boot REST APIs with OpenAPI and enterprise patterns

⎈

Microservices

Spring Cloud with service discovery and distributed tracing

⚡

Reactive Systems

Spring WebFlux for non-blocking high-throughput services

📊

Spring Batch

Large-scale ETL and report generation with Spring Batch

⬆

Java Modernisation

Migrating Java 8/11 monoliths to Java 21

📱

Kotlin / Android

Kotlin backend services and Android development

Services

What our Java engineers deliver

🏗

Spring Boot 3

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Virtual Threads & Native

✓ Modern Spring Boot 3 with virtual threads, native image, and Spring Data JPA.

🔐

Spring Security

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OAuth2 · JWT · RBAC

✓ OAuth2 Resource Server, JWT, and method-level security.

📦

Spring Cloud

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Microservices Platform

✓ Service discovery, config server, circuit breaker with Spring Cloud.

⚡

Reactive Spring

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WebFlux & Reactor

✓ Non-blocking Reactive APIs with Spring WebFlux and Project Reactor.

🧪

Testing

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JUnit 5 & Testcontainers

✓ JUnit 5, MockMvc, Testcontainers, and WireMock for full coverage.

📊

Persistence

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JPA · Flyway · jOOQ

✓ Hibernate 6, Flyway migrations, and jOOQ for complex SQL.

Our Process

How we deliver java projects

01

Architecture Design

Week 1

Package structure, domain model, aggregate boundaries, and config strategy.

02

Project Setup

Week 1

Spring Initializr, Java 21, Docker, Flyway, GitHub Actions, SonarQube.

03

Core Development

Week 2–7

Feature by feature with JUnit 5, @DataJpaTest, and MockMvc alongside each feature.

04

Performance Tuning

Week 6–7

Virtual thread config, HikariCP pool tuning, N+1 fixes, and JVM tuning.

05

Security Review

Week 7

Spring Security audit, OWASP checklist, dependency scanning.

06

Production Deploy

Week 8

Docker + Kubernetes or ECS deployment, Actuator monitoring, documentation.

Ecosystem

The Java ecosystem

CATEGORY

Java Core

Java 21 (LTS)

Virtual Threads

Records & Sealed

GraalVM Native

CATEGORY

Spring

Spring Boot 3

Spring Security

Spring Data

Spring Cloud

CATEGORY

Database

Hibernate 6

Flyway

jOOQ

R2DBC

CATEGORY

Testing

JUnit 5

Testcontainers

Mockito

ArchUnit

CATEGORY

DevOps

Docker

Kubernetes

GitHub Actions

SonarQube

FAQ

Java
questions

Straight answers before you hire.

Have a project?

Our engineers answer — not a sales team.

Talk to an Engineer →

Java 21 vs older LTS — should we upgrade?+

Yes — Java 21 brings virtual threads (Project Loom) for massive concurrency improvements, pattern matching, records, and sealed classes. The startup improvements with GraalVM native make Java competitive for serverless.

Spring Boot vs Quarkus vs Micronaut?+

Spring Boot for most teams — largest ecosystem, most tutorials, easiest hiring. Quarkus when startup time is critical (Kubernetes). Micronaut for compile-time DI without reflection. We primarily build Spring Boot.

Can you modernise our existing Java application?+

Yes — Java 8/11 → Java 21 upgrades, EJB → Spring Bean migration, monolith → microservice decomposition, and Hibernate 5 → 6 upgrades. We do it incrementally to avoid big-bang rewrites.

How do you handle enterprise integration?+

Spring Integration for EIP patterns, Apache Camel for complex routing, Spring Batch for bulk processing, and Kafka/RabbitMQ for event streaming.

Java & Spring Boot
Enterprise Java. Virtual Threads. Native Image.

Every type of
java project

What our Java engineers deliver

How we deliver java projects

The Java ecosystem

Java
questions

Often used alongside Java

Start your java project
the right way

Java & Spring BootEnterprise Java. Virtual Threads. Native Image.

Every type ofjava project

What our Java engineers deliver

How we deliver java projects

The Java ecosystem

Javaquestions

Often used alongside Java

Start your java projectthe right way

Java & Spring Boot
Enterprise Java. Virtual Threads. Native Image.

Every type of
java project

Java
questions

Start your java project
the right way