You will get Build & Integrate Java/Spring Backend with Kafka & Nginx — Optimize & Fix
Project details
I help you build, fix, or improve Java/Spring backend systems — from resolving critical bugs and integrating external APIs to developing robust features from scratch. With 4+ years of experience, I prioritize clean architecture, performance, and reliability. I'm also an expert in database design and optimization, with a genuine passion for building fast, scalable, and well-structured data models. You’ll get fast delivery, clear communication, and solutions aligned with your business goals — without the overhead.
Technology stack I work with:
Java version 8, 11, 17
Docker, Kubernetes
Maven, Gradle
SQL – PostgreSQL, MySQL; NoSQL – Cassandra, Redis
CI/CD & VCS: Git, GitLab CI, Jenkins
Linux: Debian, Ubuntu
RESTful APIs, Microservices
JUnit, Mockito, Testcontainers
Prometheus, Grafana
Apache Kafka
Spring Boot & Data JPA, Hibernate
Spring Security, JWT, OAuth2
SOLID, Design Patterns, Clean Code
SonarQube, Checkstyle, PMD
SLF4J, Logback
Jira, Confluence
Technology stack I work with:
Java version 8, 11, 17
Docker, Kubernetes
Maven, Gradle
SQL – PostgreSQL, MySQL; NoSQL – Cassandra, Redis
CI/CD & VCS: Git, GitLab CI, Jenkins
Linux: Debian, Ubuntu
RESTful APIs, Microservices
JUnit, Mockito, Testcontainers
Prometheus, Grafana
Apache Kafka
Spring Boot & Data JPA, Hibernate
Spring Security, JWT, OAuth2
SOLID, Design Patterns, Clean Code
SonarQube, Checkstyle, PMD
SLF4J, Logback
Jira, Confluence
Programming Languages
Java, Scala, KotlinCoding Expertise
Cross Browser & Device Compatibility, Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$50
|
Standard
$150
|
Advanced
$500
|
|---|---|---|---|
| Delivery Time | 1 day | 2 days | 4 days |
Number of Revisions | 0 | 2 | 3 |
Design Customization | - | - | - |
Content Upload | - | ||
Responsive Design | - | - | - |
Source Code |
Frequently asked questions
About Andrew
Java Developer | Spring Boot Backend Engineer
Vilnius, Lithuania - 12:49 pm local time
I can help you build or maintain your backend, fix critical bugs or vulnerabilities, optimize database performance, refactor legacy code, or migrate your system to a modern Java stack. You bring the problem — I’ll bring the solution.
Tech stack: Java 8/11/17, Spring Boot, REST APIs, OAuth2, JWT, Docker, Kubernetes, CI/CD, Linux, JUnit, Mockito, Testcontainers, Git, GitLab CI, Jenkins, Prometheus, Grafana, Maven, Gradle, SonarQube, Checkstyle, Design Patterns, Clean Code, Jira, Confluence.
Let’s build something reliable.
Steps for completing your project
After purchasing the project, send requirements so Andrew can start the project.
Delivery time starts when Andrew receives requirements from you.
Andrew works on your project following the steps below.
Revisions may occur after the delivery date.
Analyze requirements, review logs/code, and deliver a solution promptly
Collaboratively or solo, I’ll document each step, diagnose issues or define requirements, review your architecture, and design & implement new features or integrations prioritizing reliability, performance and scalability.
Implement, test, and deploy the approved solution
I’ll write and run unit/integration tests, enforce code quality checks (Sonar, linting), then deploy changes to your environment. Finally, I’ll verify full functionality and ensure smooth operation with rollback plans in place.