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What is Java?

Java is a general-purpose programming language and once compiled can run on multiple platforms, including desktop, mobile and the web.

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At Freelancer.com you will find Java coders to help you with all your Java needs. From Java games to desktop Java applications...and more!

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Silvyster A.

4.9

1932

8.2

99%

Baguio City, Philippines

$30 USD per hour

We're a community driven by a passion for computing technology. Our group consists of fellow enthusiasts, architects, engineers, hackers, and analysts, all for advancing information technology and computer science. Our goal is to contribute to knowledge through research, experiments, and practical experiences. We leverage this knowledge to develop innovative solutions for the digital world. We are expanding our services to reach more people. For more information and inquiries, send us a message, and let's discuss it over a cup of coffee.

Java PHP ASP C Programming JavaScript

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Jestoni A.

5.0

330

7.2

98%

Quezon City, Philippines

$15 USD per hour

Speed & Quality I am a web developer with 14 years of experience. I love to do automation ~ Languages => PHP, JavaScript, Python Laravel , Node , React ~ Databases => Mysql, MongoDB, Firebase, postgreSQL ~ APIs => Google,Here.com, Facebook, Microsoft Graph,Twitter, Paypal, Stripe, TMDB, IMDB, Alibaba, AliExpress, Twilio, Quickbooks ---- Ubuntu, Centos, Windows, macOS ~ Other Fix/Create Data Entry, WHM, Cpanel, Shopify, Magento, Drupal, Prestashop, Wordpress(Taxonomy,Custom Post Type,shortcode,plugin,child-theme), CSS, JQuery, BootsStrap, PSD/Image to HTML, Datatables, Web Scraping(Selenium,bs4,Php,jS), SSL, Htaccess, XCrud, (JSON,CSV,EXCEL), Scripting and more..

Java JavaScript XML AJAX CSS

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Joven R.

5.0

5.2

100%

Digos, Philippines

$5 USD per hour

Working with Fillable PDF, Data Entry, Excel, Photoshop, SEO, Flyers, Brochure, Images Background Removing, Shopify Store upload & update Product,

Java PHP Graphic Design Banner Design Data Processing

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Mark B.

5.0

98%

Avalon, Philippines

$55 USD per hour

Quite some JAVA. This account exists solely for the purpose of testing features on this website. If you are an official employer looking for a freelancer, please ignore this account. Thank you for your cooperation and for using our website. ${Cool}

Java PHP JavaScript Adobe Flash Website Design

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Dexter Vincent M.

4.7

3.3

88%

Cebu, Philippines

$30 USD per hour

BS Architecture Graduate in Cebu Institute of Technology University, Philippines with 8 years full-time and freelance of work experience in 3D Architectural Modeling and Rendering. Provide 3D models and photo realistic render for presentations and drawings submissions to the clients. Skills: • Autodesk 3ds Max • V-ray • Autodesk AutoCAD • Adobe Photoshop • Sketchup • 360 • Panorama

Java PHP C Programming JavaScript Adobe Flash

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Jushua M.

4.9

6.0

93%

Taguig, Philippines

$30 USD per hour

Java PHP JavaScript Python Internet Marketing

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Christian Joseph V.

5.0

5.4

100%

Bacoor, Philippines

$40 USD per hour

I am a highly skilled and experienced software engineer with a strong background in full-stack web development. With over 5 years of professional experience, I have successfully delivered complex software projects for clients worldwide. My expertise includes front-end and back-end development, database design, API integration, and performance optimization. I am proficient in multiple programming languages, frameworks, and tools, and have a proven track record of meeting project deadlines and exceeding client expectations. Skills: Full-stack web development (JavaScript, Python, PHP, Ruby) Front-end development (HTML5, CSS3, React, Angular, Vue) Back-end development (Node.js, Express, Django, Laravel) Database design and management (MySQL, MongoDB, PostgreSQL) API integration (RESTful, GraphQL) Performance optimization and debugging Git version control Agile development methodologies (Scrum, Kanban) Test-driven development (TDD) and continuous integration/continuous delivery (CI/CD)

Java C Programming JavaScript Python Visual Basic

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Jean Patrick R.

4.8

5.3

91%

Taytay, Philippines

$25 USD per hour

Hi! I'm Jean, a Filipino AI/ML Engineer and Full-Stack Developer with over 8 years of experience working on production-grade AI systems, enterprise web apps, and mobile applications. I’ve collaborated with teams in the Netherlands, Germany, and the Philippines, helping companies build efficient, scalable, and secure digital products. I specialize in machine learning, React/Next.js, Node.js, Flutter, and cloud technologies such as AWS and GCP.

Java PHP Python .NET Website Design

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Nicky John L.

5.0

5.6

100%

Alaminos, Philippines

$40 USD per hour

I specialize in building AI-powered web applications from concept to production, combining modern full-stack development with LLM integration, scalable cloud infrastructure, and automated data pipelines. Whether you're developing an AI SaaS platform, internal business tool, or enterprise application, I can help you deliver a reliable, production-ready solution. My expertise includes: Frontend: React.js, Next.js, TypeScript, Tailwind CSS, Material UI Backend: Python (Django, FastAPI), Node.js, Express.js AI & LLM: OpenAI, Anthropic Claude, Gemini, Llama, LangChain, RAG, vector databases, AI agents, prompt engineering Data Engineering: Python ETL pipelines, data processing, web scraping, automation, PostgreSQL, MongoDB Cloud & DevOps: AWS, Docker, Kubernetes, CI/CD, REST APIs, GraphQL I have experience developing: * AI chatbots and intelligent assistants * LLM-powered business automation platforms * Healthcare and telehealth applications * Student enrollment and management systems * SaaS dashboards and enterprise web applications * Automated ETL and data processing pipelines I focus on writing clean, maintainable code with an emphasis on performance, scalability, and security. I enjoy collaborating with startups and growing companies to transform ideas into high-quality software that delivers measurable business value. If you're looking for a developer who understands both modern full-stack development and AI technologies, I'd be happy to discuss your project.

Java PHP JavaScript Python WordPress

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How to hire a great freelance Java Developer

A Java developer is a software engineer who designs, codes, tests, and maintains applications written in Java, including backend services, enterprise systems, Android apps, and high-traffic web platforms. Hiring a skilled Java developer means bringing in expertise that powers everything from banking systems to e-commerce checkouts to mobile apps used by millions.

What does a Java developer do?

A Java programmer builds software using the Java language and its surrounding ecosystem. The work spans server-side application logic, RESTful APIs, microservices, database integration, performance tuning, and integration with messaging systems and cloud platforms. Java engineers also write unit and integration tests, debug production issues, refactor legacy code, and deploy services into containerised environments.

Java remains one of the most widely deployed languages in enterprise software because of its stability, mature tooling, and write-once-run-anywhere portability across the JVM. A capable Java developer translates business requirements into reliable, maintainable code that scales — directly affecting product reliability, system uptime, and engineering velocity.

Common deliverables from a Java developer

Backend REST and GraphQL APIs built with Spring Boot or Jakarta EE

Microservices architectures using Spring Cloud, Kafka, and RabbitMQ

Database layers built with JPA, Hibernate, JDBC, MySQL, PostgreSQL, Oracle, or MongoDB

Android applications developed in Java, often paired with Kotlin interop

Batch processing pipelines using Spring Batch or Apache Camel

Authentication and authorization layers with OAuth 2.0, JWT, and Spring Security

Unit and integration test suites using JUnit, Mockito, and Testcontainers

CI/CD pipelines using Maven or Gradle with Jenkins, GitHub Actions, or GitLab CI

Containerised deployments to Docker, Kubernetes, AWS, Azure, or Google Cloud

Legacy system modernisation, including migrations from older Java versions to Java 17 or Java 21

Tools and frameworks Java developers use

The Java ecosystem is broad, and strong Java engineers are fluent in the frameworks and tools that match the project type. For backend work, Spring Boot dominates, alongside Spring Data, Spring Security, and Spring Cloud. Hibernate and JPA handle persistence. Apache Kafka and RabbitMQ are standard for event-driven systems.

For builds and dependency management, expect Maven or Gradle. For IDE work, IntelliJ IDEA and Eclipse are the most common. Testing typically involves JUnit 5, Mockito, AssertJ, and Testcontainers. Observability often relies on Micrometer, Prometheus, Grafana, and the ELK stack. For cloud-native work, Java engineers commonly use Docker, Kubernetes, Helm, and AWS SDK for Java.

Industries that hire Java developers

Java is the workhorse language for industries that demand reliability and scale. Financial services and banking firms use Java for trading systems, payment processing, and core banking platforms. Telecommunications companies rely on Java for billing and provisioning systems. E-commerce businesses build catalogue, checkout, and order management services in Java.

Healthcare, insurance, logistics, government, and large SaaS providers also lean heavily on Java engineers. Startups frequently hire Java developers for Android apps, API backends, and integrations with enterprise customers who require Java-based connectors.

How to evaluate a Java developer

Look beyond years of experience and assess depth in the parts of the ecosystem that match your project. A Java developer building a Spring Boot microservice needs different signals than one maintaining an Android codebase or a legacy Java EE monolith.

Portfolio or GitHub repositories showing production-quality Java code, clean package structure, and thoughtful test coverage

Demonstrated experience with the specific framework you need — Spring Boot, Jakarta EE, Android SDK, or Quarkus

Familiarity with the Java version your stack uses, including modern features like records, sealed classes, and virtual threads

Experience with relational and non-relational databases, plus ORM patterns and SQL tuning

Understanding of concurrency, memory management, and JVM performance tuning

Track record of writing tests and working within CI/CD pipelines

Client reviews referencing communication, code quality, and on-time delivery

Sample interview questions you can copy and use:

Walk me through how you would design a REST API in Spring Boot for a high-traffic checkout endpoint.

How do you handle database transactions and isolation levels when using JPA and Hibernate?

What is the difference between a HashMap and a ConcurrentHashMap, and when would you choose each?

How would you debug a memory leak in a long-running Java service in production?

Describe your approach to writing unit tests versus integration tests, and how you decide what to mock.

Why hire Java developers on Freelancer.com

Freelancer.com hosts millions of developers worldwide, including a deep pool of Java engineers spanning backend, Android, enterprise, and cloud-native specialisations. You can review verified profiles, portfolios, certifications, and client reviews before shortlisting, then compare competitive bids on your specific brief.

Whether you need a short engagement to fix a production bug, a long-term contractor to build a microservices platform, or a Java consultant to advise on architecture, you can hire on Freelancer.com with the confidence of Milestone Payments, escrow protection, and a global talent pool covering every time zone. Clients set their own budget and receive proposals from freelancers who match the scope.

Post a project on Freelancer.com today and connect with skilled Java developers ready to build, scale, and maintain the software your business depends on.

What are the steps to hiring a freelance Java developer?

Hiring the right Java engineer comes down to a clear brief, careful review of proposals, and a final evaluation grounded in profile evidence. The process below walks you through each stage so you end up with a developer whose skills match your stack, not just their bid price.

Step 1: Post your project on Freelancer.com

Your project post is the single biggest determinant of bid quality — a precise brief filters for Java developers whose experience genuinely matches your stack. Head to the post project page , where you fill in the brief, scope, timeline, and budget before publishing the project for freelancers to bid on. The more specific you are about frameworks, Java version, and deliverables, the better the bids you will receive.

State the Java version (Java 8, 11, 17, 21) and target frameworks (Spring Boot, Jakarta EE, Android SDK, Quarkus)

List required integrations — databases, message brokers, third-party APIs, cloud providers

Describe deliverables clearly: REST endpoints, microservices, Android APK, library upgrade, or full application

Include test coverage expectations, CI/CD requirements, and deployment targets such as Docker or Kubernetes

Set a timeline and indicate whether the engagement is fixed-price or hourly

Step 2: Review bids from freelancers

Bids are short proposals, not just price quotes. A strong proposal from a Java developer shows they have read your brief, understood the technical context, and have a realistic plan. Use this stage to shortlist candidates whose interpretation of the work matches yours.

Look for proposals that reference your specific frameworks, Java version, and architectural patterns

Note whether the developer raises clarifying questions about scope, performance targets, or existing code

Check the proposed timeline against the complexity — overly optimistic estimates often signal weak scoping

Look for sample work, GitHub links, or descriptions of similar Java projects they have delivered

Use Freelancer.com chat to ask shortlisted candidates technical questions before deciding

Step 3: Evaluate freelancers and award the project

The final decision combines proposal quality with profile evidence. Look for consistency across past Java work, not just one impressive sample, and weigh client reviews that speak to code quality, communication, and reliability under pressure.

Review portfolio depth, especially Java projects similar in scale and framework to yours

Check star ratings alongside the volume of completed projects

Read written client reviews for mentions of code quality, testing discipline, and on-time delivery

Confirm verified payment method, completion rate, and on-time delivery rate on the profile

Award the project and use Freelancer.com Milestone Payments to release funds as the developer hits agreed checkpoints, protecting both sides during the engagement

How long does a Java development project take?

Timelines depend on scope. A bug fix or small API endpoint can take a few days, while a full Spring Boot microservices build or Android app can run weeks to several months. Share your requirements in the brief so freelancers can quote realistic timelines.

Can I hire a Java developer for a one-off project?

Yes. Many clients post a project on Freelancer.com for short engagements such as code reviews, performance tuning, library upgrades, or migrating an application to a newer Java version. You can also hire on an hourly basis for ongoing work.

What is the difference between a Java developer and a full-stack developer?

A Java developer specialises in server-side and JVM-based work, typically using Spring Boot, Hibernate, and related frameworks. A full-stack developer who works in Java handles both backend Java services and frontend technologies like React, Angular, or Vue. If your project needs UI work as well, look for Java developers with full-stack experience.

Should I hire a Java developer or a Kotlin developer for Android?

Both can build Android apps, and the two languages interoperate on the JVM. Many Android developers are fluent in both. Choose based on your existing codebase — legacy Android apps are often Java, while newer apps are typically Kotlin-first.

Do I need a Java developer or a software architect?

For implementation work, a Java developer is sufficient. If you are designing a large distributed system, choosing between microservices and monolithic patterns, or planning a multi-year platform, hiring a senior Java engineer with architecture experience or a dedicated software architect is worthwhile.