Find the Best Java Development Jobs
Check out a sample of the 1,107 Java Development jobs posted on Upwork
Claude Code + GCP Developer - Live Client Deployment + Long-Term Per-Install Partnership
Hourly ‐ Posted 2 days agoHours needed
Duration
Experience level
We're ecomAIOS, a done-for-you AI Operating System for 7-figure ecom brands. We install a custom AIOS on the client's own infrastructu…
Windows Application Developer for Medical Research Tool
Hourly ‐ Posted 2 days agoHours needed
Duration
Experience level
We are seeking a skilled Windows Application Developer to create a lightweight desktop applet for medical research calculations. The ap…
Kotlin APP Development
Hourly ‐ Posted 2 days agoHours needed
Duration
Experience level
Our Kotlin-based CRM app already records and attaches sales calls to the correct lead cards without a hiccup on Samsung and Xiaomi devi…
Wordpress Website Child Theme Creation & Site Speed Optimization
Fixed-price ‐ Posted 2 days agoFixed-price
Experience level
I’m looking for a WordPress developer to help update my website with a child theme, footer design, & site speed optimization. ** What…
LATAM Dev Shop — TypeScript/AWS Serverless + Next.js Staff Aug — Rate Card + Paid Pilot
Hourly ‐ Posted 2 days agoHours needed
Duration
Experience level
We operate a multi-tenant consumer ordering platform for large enterprise restaurant brands. The core stack is ~44 TypeScript microserv…
Backend Developer for Blockchain Game Backend
Hourly ‐ Posted 2 days agoHours needed
Duration
Experience level
We are seeking an experienced backend developer to create a crypto game backend using React. The ideal candidate will have a strong und…
Mainframe Code Conversion Consultant (Part-Time)
Hourly ‐ Posted 2 days agoHours needed
Duration
Experience level
We are looking for a Mainframe-to-.NET modernization consultant with hands-on experience using AI tools such as Claude, Gemini, ChatGPT…
Trading System Development
Fixed-price ‐ Posted 2 days agoFixed-price
Experience level
Develop a trading system with a Renko EMA(6) strategy for signal generation. Create an execution engine to receive signals and decide o…
Inventory Software Development with Additional Features
Fixed-price ‐ Posted 2 days agoFixed-price
Experience level
I need to develop an inventory software from a given reference with basic additional features. The project involves enhancing the exist…
Web Developer
Fixed-price ‐ Posted 2 days agoFixed-price
Experience level
We are seeking a highly skilled and innovative Web Developer to join our dynamic team. The ideal candidate will be responsible for desi…
can earn $20–$40/hr.
$20$40
Median hourly rates (USD)
How to Become a Freelance Java Developer
Java is considered one of the best programming languages for enterprise software. What’s more,Java is one of the native programming languages supported by Android, so many mobile app developers use Java.
What does a Java developer do?
Java developers are responsible for architecting, designing, and developing software using Java, and many popular software libraries and frameworks are written in Java, such as Spring and Hibernate.
Java programmers and developers typically work as part of a team to design and develop software solutions for client requests. Java is famous as an embedded systems programming language, so many devices are powered using software written in Java.
Some other roles and responsibilities include:
- Designing, implementing, and maintaining Java applications
- Delivering applications with high availability and performance
- Ensuring designs comply with specifications
What skills do I need to become a Java developer?
To become a Java developer, experience is more important than a college degree, but a bachelor’s degree in computer science, software engineering, and another related field is often recommended.
Java developers must understand programming concepts such as object-oriented design and common frameworks and software libraries written in Java. Java developers will also be familiar with typical programming tools such as IDEs and version control software.
Common skills a Java developer should possess include:
- In-depth knowledge of OO design and programming
- Excellent analytical, problem-solving, and troubleshooting skills
- Knowledge of relational databases (Oracle, SQL Server, DB2)
- Experience with back-end application programming interfaces (APIs)
What are the job responsibilities of a Java developer?
A Java developer will build and maintain software applications to develop web apps, mobile apps, embedded system apps, server-side software, and more.
Typically, a Java developer will work as part of a team, using IDEs to write code and version control software to commit code as part of a team effort. A Java developer will be expected to:
- Plan, design, and code software solutions for new and existing projects
- Write efficient and reusable code
- Develop software using industry best practices
- Work with software engineers, product managers, software developers, web developers, and clients to ensure the software is designed well and meets user needs
Eager to learn more about Java development on Upwork? Check out these additional resources:
Upwork is not affiliated with and does not sponsor or endorse any of the tools or services discussed in this section. These tools and services are provided only as potential options, and each reader and company should take the time needed to adequately analyse and determine the tools or services that would best fit their specific needs and situation.
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