Java is a versatile, object-oriented programming language that is widely used for software development across various industries. Java Developers can help clients create anything from complex web applications to automated trading bots and mobile apps. With their advanced skills and knowledge, they can turn your vision into reality, providing you with tailored solutions that align with your business goals. Here are some recent projects that our expert Java Developers made real:

  • Developing custom GUIs for existing codebases
  • Creating encrypted, secure crypto apps
  • Designing cross-platform audio merging tools for mobile devices
  • Building sophisticated trading bots for the cryptocurrency market
  • Implementing open-source virtual machines in C
  • Collaborating as senior developers on large-scale Android projects
  • Solving server request errors for mobile applications
  • Running and optimizing code from Git repositories
  • Designing and implementing web services for seamless integration

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    334 份搜到的工作,货币单位为 USD

    Queremos meter una actualización de funciones a un programa de Escritorio programado en Java e insertar tambien funcionalidad online para que los datos que recoge los mande directamente a la nube en vez de en local como hace actualmente. Es un programa de Cronometraje deportivo que trabaja con la API de dispositivos Impinj.

    $534 (Avg Bid)
    $534 平均报价
    10 个竞标
    Api Whatsapp 6 天 left

    I need to implement whatsapp on my business.

    $197 (Avg Bid)
    $197 平均报价
    12 个竞标

    I require a freelancer, who owns any of the Zebra devices (TCX, MCX) and can test the scenarios and deployment to be working before delivering. We have a fleet of Zebra MC3300 handheld scanners. We have our own warehouse picking Android apps to be installed on them. We also wish to use Enterprise Home Screen to limit access to apps by warehouse workers. And lastly, we wish to update Android OS + StageNow app to a certain version. For this, we need to create StageNow scenarios for easy and mass deployment. We need someone who did this before and is experienced with StageNow deployment. * We have scanners purchased at various times, so they are running Android 8, 9, and 10. * The scanners are running various MXMF versions: / 8.0.0.10 / 7.2.1.0 We wish the output to be several individual ...

    $110 (Avg Bid)
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    Hello, I have an API java script which fires a custom conversion pixel to an ad network every time an action is completed on my webpage. However, this conversion pixel is not firing properly, and the issue is on my side. I am using the method as "GET" and the mode as "no-cors" and it is not working. My console error message says that the API call was "stalled". I'm able to fire the pixel manually by visiting the webpage however, so it's definitely an issue with my code. I'm looking for someone to fix the code so that it fires successfully. My website is located at so you can see the script in action on the homepage by viewing network details under console. I need this completed today. So please only respond if you're able to do it right...

    $18 (Avg Bid)
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    I'm looking for someone to help me with a programming language Java project. The purpose of the project is to solve a question, though I'm not sure which version of Java should be used. The type of file I need is a tar file. Therefore, I'm looking for an experienced programmer who can use Java to generate a tar file to provide a solution to this project. Please let me know if you are able to help with this. Thanks!

    $2 / hr (Avg Bid)
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    7 个竞标

    The project rules are: ● The goal and details of the competition are described on the Kaggle competition page itself. In summary, it is about designing an algorithm that predicts the 1000 missing links for a social network of members of a Spanish university.

    $206 (Avg Bid)
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    Simple Java Assignment 6 天 left
    已验证

    I need to implementation a program in Java. You may use Swing or AWT, whichever you prefer. Provide comments in your code to show the patterns design must correctly apply the controller and command patterns AND the implementation must also correctly implement these patterns. A partially correct implementation is considered incorrect. I will send you in chat, its very basic and small task max budget 10$

    $50 (Avg Bid)
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    3 个竞标

    Tengo un problema con una aplicación que estoy desarrollando con Android Studio y trato de realizar una conexión vía Bluetooth, pero he hecho lo que sale en el manual de Android y al simular en un móvil real no me pregunta si doy permisos para la conexión por Bluetooth. Lo deniega directamente. En un emulador virtual sí funciona Necesito un Activity que haga la conexión Bluetooth y funcione

    $179 (Avg Bid)
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    I'm looking for a talented developer to build a School Paying System. This system will not require integration with any external systems. It's expected launch date is 3 months from now. The School Paying System will provide an easy way for student to pay at the canteen. Its not for a single school its for all schools at the city. It will also he used out of the school so at libraries, study rooms, coffee shops and stores thats we give permission to use our technology The system will be built using the latest industry standards and the highest quality coding practices. All the data will be securely stored and will use robust encryption to ensure the safety and privacy of the school's information. And for faster paying solutions, every school going to have its own small serv...

    $1283 (Avg Bid)
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    This is POC for the client. I just want direct developer, please sales or business development person avoid connecting. There is existing project in andriod with code. You need to use the functionality and develop a simple logic on the same. A fix price work as the project file is alredy availble. once this POC is approved, want to go for more features.

    $148 (Avg Bid)
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    We need an Android app for time in and time our for daily attendance . but restricted to log in from allowable gps coordinates. Send the data to firebase and downoad to local server and send the logs through text messages also

    $226 (Avg Bid)
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    I am in need of a talented Python Selenium developer who can complete a project within 1-2 weeks. This project will require the integration of an pass the recaptcha using python-capmonster. Expert Python programming skills are essential for the successful completion of this project. The successful candidate will be expected to provide source code and documentation upon completion.

    $16 / hr (Avg Bid)
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    I have some GitHub Smart contract code which is I want to modify. one smart contract code is want change ERC20 to BEP20 for token creation with price another one is sale contract which is I want 1 BEP20 token selling cost is 1 USDT

    $30 (Avg Bid)
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    I would like to get a python based software developed to auto login and mimic orders from one Zerodha account to another account. Basically the software will monitor the primary account continuously and whatever trades get triggered in the primary account, it will copy those into secondary and all attached accounts. All the Auto Login can be done through selenium and Data like username/password/TOTP can be taken from excel sheet per user . Also a separate same Python based Dashboard to monitor all account activity. I have attached the file needed to get basic idea.

    $509 (Avg Bid)
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    Teach me software basis, terminologies and make me understand enough to manage team. PHP and JAVA

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    Producto minimo viable de un aplicacio de delivery tipo uber, con pequeños cambios

    $560 (Avg Bid)
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    I am looking for a web-based chatting application that is coded in Any language and has messaging and voice calling features. I want the application to be secure and have a user database. Required features • A user can send a message to friends, and message can be text, picture, or short video. • A user can receive a message from a friend. • A user can search its chat history (only consider text). • All chat histories are stored in the cloud server. • We do not want the cloud server to learn anything about any chat history. • Ideally, we do not want the cloud server to learn anything about a user, e.g., communication pattern and connections with other users. Deliverables Three items need to be submitted, the source code, the document, and the presentation sl...

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    Android işletim sistemli kiosk uygulaması yapılmasını istiyorum. Kaynak koduyla birlikte Daha sonradan değişiklikler ve ekleme yapabilmem için gerekli talimatları içeren bir çalışma istiyorum. Sadece birkaç sayfadan oluşuyor. Tasarım için örnek göndereceğim. Anasayfada sol bölümde resimli kategoriler ve kalan bölüm boyunca ürünlerin yer aldığı bir sayfa. Ürünlerin altında + butonu olacak. + ya basıldığında altında 1 ve - işareti çıkacak. Ürüne tıklandığında ürün resmi genişleyecek ve ürün ayrıntıları yazacak sepetle ekle ve +,- pozisyonu burada da olacak. Köşede sepet simgesine tıklandığında sepete eklenenler çıkacak. Sepetten ürün ç...

    $147 (Avg Bid)
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    The project includes creating UI for a form and write service/DAO layers. UI code already exists in other forms, code can be copied/reused. Once the data is entered in the form - Save and Cancel buttons functionality implementation. I will walk you through the tables/.js files/controllers etc. Mockups are available for the form. This is only one form.

    $158 (Avg Bid)
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    I am looking for an AWS Expert with an excellent combination of Java skills who can take on a challenging but exciting project. The primary task is to maintain our existing AWS infrastructure and to understand how it works and how to properly use it. We have a plan in place and source code is not in place yet, however, this is a new project and we need an Expert with the right qualifications to help complete it. This person should understand the complexities of AWS and have highly developed Java skills and experience to handle the tasks required. We are searching for an individual who is confident, reliable and capable of working through challenges while also providing timely solutions. If you have the necessary qualifications and experience, please apply today and together we can make thi...

    $13 / hr (Avg Bid)
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    Project to develop backend of a web application using Java. Developing Business logic, writing unit tests, integration tests Preferred candidate to have 4+ years of Java experience. Must be proficient in back-end Java development and React for frontend. We expect the project spanning over 3-6 months. Compensation can be discussed once you understand the project requirement in our first meeting. Key Responsibilities: 1. Design and develop high-performance and scalable applications using Java. 2. Collaborate with cross-functional teams to implement new features. 3. Optimize application performance by resolving bottlenecks. 4. Perform unit testing, code reviews to ensure delivery of high-quality software. Requirements: --Full time free lancer --10 years of Java experience -- India location...

    $2464 (Avg Bid)
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    We are atempting to create a simple comunication simulator between a student pilot and a teacher. The student will receive instructions from the teacher, and will need to enter the request onto the walkie talkie. The teacher will need the ability to verify that the student has enter the information correctly. At all times there needs to be communcation(voice) between the parties logged in. I have attached a simple idea of what is needed.

    $500 (Avg Bid)
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    Extract data from print job 6 天 left
    已验证

    I need a program tht able to extract print job data. Eg. My POS system will send a print job to receipt printer. Before print receipt, the program should be able to extract the data from print job. Eg prod sku and description

    $477 (Avg Bid)
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    Need website for Artymonkeys 6 天 left
    已验证

    I am looking for assistance in creating a business portfolio website for my hobby business, Artymonkeys. The website won't need any hosting as I won't be implementing e-commerce on this platform. Specifically, I am looking for a freelancer who can develop a website that can showcase my service, and display my contact information. I expect the website to be made with modern standards and technologies to ensure optimal performance and functionality.

    $504 (Avg Bid)
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    Need installation of free web server panel on linux GCP server Need to install cassandra database

    $104 (Avg Bid)
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    8 个竞标

    app development ...........................................................................

    $142 (Avg Bid)
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    Android App requirements Epub reader with general features as below 1. Scan and load available epub files in mobile. 2. Select & Copy , share text options 3. Change font size option 4. Epub font will be devnagari 5. Few Default links to download epub files from Google drive 6. Then open to read. This will resume from last accessed page. Resume from last accessed page. (Book wise resume history , if possible) 7. search text within book option 8. Menu (& action) : A. Contents : show contents of book B. Search : Search text within book and show search results and open that searched text page. 9. Category : 1. Create category and 2. add/remove books to/from category. 3. Onselecting specific category, show books in that category. 10. Download Books : 1. Open static pag...

    $196 (Avg Bid)
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    Hello, I'm looking for a freelancer to help me understand a web application code written with Angular and Java. Specifically, I'm looking for a freelancer who can do a full code review in order to help me gain an understanding of the existing code. My team has an advanced level of experience with Angular and Java, so the freelancer needs to have an equally advanced level of knowledge. So if you think you've got the expertise necessary to give me the insights I need to understand this piece of code, get in touch! The source of the project is on github , it is a open source code application. You can check the code then quote your proposal. Would request to please go through the code and then only bid

    $197 (Avg Bid)
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    Android penetration testing 6 天 left
    已验证

    As an Android app developer, I'm looking for someone to provide ethical hacking and penetration testing services for one specific application. The successful freelance will have a solid track record in penetration testing and demonstrate experience in this field.

    $174 (Avg Bid)
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    We are looking for a Java developer who can do Technical reviews, Code reviews & Mentor the Team Well-versed with Java language, Core Java, Client-side programming, Server-side programming, and J2EE technologies. Knowledge of presentation languages such as JSP, HTML, Style Sheets, and JavaScript. Familiarity with AJAX, JQuery, and equivalent technologies Good understanding of relational databases, SQL & MySQL Understanding of Struts, Hibernate framework. Responsibilities and Duties Develop & implement new software programs. Maintain & improve the performance of existing software. Test & maintain software products to ensure strong functionality & optimization. Recommend improvements to existing software programs as necessary. Required Experience, Skills, and Quali...

    $364 (Avg Bid)
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    11 个竞标

    Looking android app developer for manage my application and host on g.p console my budget is 7$ per application for this

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    6 个竞标

    This is a test task to find the right partner for onging work on this topic. Expected solution time: in a few weeks, we focus on quality-delivery & honest-estimation more than "quick & dirty" or "overseller" Your task is to help us to build the evil side ;-) MAC (we provide linux+windows) In the case you have to build a dll of pjsip for macOS x64 and ARM, along with the dependent libraries. This libraries have to be loaded via java 17+ Examples of required work: ) So the app has to work on a desktop (macOS) and have to communicate with a SIP provider only. e.g (we will share you a fully working sip account after award) Later (not scope here) ports to iOS/Android required too your tasks will be to help to port a application to MAC You need to implement fo...

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    Data Structure 6 天 left

    I need help in help in data structure related project. Let me know if any one interested. Please Apply

    $29 (Avg Bid)
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    E-Book Store 6 天 left

    need a ecommerce website for selling books its for my college final year project. the project should have login and sign up page as usual and the user should be able to add to cart and proceed for payment. cod is fine and the bill should be able to be downloaded as pdf. front end: html css back end: jsp servlet database: mysql

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    I need software developers who can build saas driving school scheduling software

    $1277 (Avg Bid)
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    48 个竞标

    Project Google Drive Link :-

    $12 / hr (Avg Bid)
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    I provide AAB or apk, and the technicians who are proficient in the Google store help me to obfuscate the code and avoid review, and successfully publish the application to the store

    $1073 (Avg Bid)
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    Hello, I'm looking for an experienced expert in AWS and programming languages such as Java and Python. I am working on a software development project that is time sensitive and I need someone with the right expertise to help move it along quickly and efficiently. If selected, you will need to know how to work with a variety of AWS services, such as Lambdas, EC2, S3, etc. You'll also need to have a solid understanding of both Java and Python syntax and how they can be combined to create effective applications. Quality and performance are important considerations, so please be prepared to show your experience and qualifications. Thanks in advance for your interest.

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    Kotlin Developer require Two module develop

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    NO COMPANY AND AGENCY, ONLY FOR INDIVIDUAL FREELANCERS Hiring Android Native Developer for Jaipur Initially, it is WFH then it will be Work from Office(Jaipur). The developer should have at least 4 years of experience and can handle the project alone. Thanks

    $695 (Avg Bid)
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    ERP web based 6 天 left
    已验证

    I am looking to build a cloud-based enterprise resource planning (ERP) system. I have existing ERP business logic that needs to be ported into the new system, as well as needing additional business logic developed from scratch. The system requires Supplier Access, Client Access and Admin Control Panel to manage both supplier and client, so I need a multi-user login setup to be included. I am looking for a Freelancer who can develop and implement the new ERP system in a timely manner while adhering to deadlines and communicating effectively throughout the development process. This Freelancer should have experience in ERP web-based systems and in developing complex business logic. Project Time frame: 60 To 70 days Go through the high-level document for more clarity. NOTE: FREELANCE ...

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    I'm looking for a freelancer to help me convert my web application from a Java Angular platform to C# .NET Core. I already have existing code and the current platform of the web application is Java. I'm looking for someone who has experience in both Java and C# .NET Core to provide the conversion. The conversion should include all aspects of the application, including the UI and any underlying architecture. All code must be clearly commented for later reference. Experience with both Angular and .NET Core is also invaluable, as I want the finished product to be as bug-free, modern and intuitive as possible. Please get in contact if you think you are the one to help me out with this project. The source of the project is on github , it is a open source code application

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    Web App Development 6 天 left
    已验证

    App is around 80% complete but currently paused because developer has urgent project commitments. This project now needs an experienced developer who can take ownership and finish the loose ends, including bug fixes, enhancements, some new features. We require a full-stack Java developer with proven experience in jhipster, springboot, vue.js. database is postgresql builds done using maven and deployed to test environment on AWS Must be able to design and develop front-end components and features. Good written and spoken English communication skills are essential. Analysis experience is a plus to help with defining new features. We estimate around 40-60 hours is needed to complete this phase. However, handover will be given by current developer and we expect work estimates to be revi...

    $34 / hr (Avg Bid)
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    It is an eyewear dApp and it is built 3 years ago, there's a lot of bugs inside now. But we would like to solve the following issues only: 1) whole order flow 2) multi-vendor system from backend to frontend (Premium, Confidence Icon, Background check, and Background Verification dynamic System) 3) showcase of hyperledger network that controls security and timestamp of transaction

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    Service app - Admin login - Engineer Login - Customer Login - Customer - customer sign up with mobile and get address / manual - Request for Repair (selection for hardware repair suggestion and manually also upload image option) - Display status of request and also see assigned engineer detail - QR code for gpay Admin - Admin get notifications of request - Assign Engineer(send notifications and engineer detail shown in request with ETA date and time) - Update status Engineer - Accept / Reject request - Get Customer location detail and issue detail(admin get notifications of accepted request) - status update with remark

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    In this project, you will design and implement a stackable file system running on Linux, which uses Amazon's S3 as backend storage. It needs to meet the following requirements: Once mounted, a bucket in S3 appears as a local directory on your Linux machine; Any updates ( creation, deletion or modification of files and subdirectories ) in the local directory are reflected in the corresponding S3 bucket, and vice vera; A stand-alone rc4, fully compatible with "openssl rc4", with both nosalt and salt options, i.e., any files encrypted by the stand-alone rc4 should be able to be decrypted by "openssl rc4", and vice versa; all files in the file system are automatically encrypted using rc4 with salt, and applications can transparently operate on the files without explic...

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    AES Encryption source code. Perform some tasks and take screenshots of results.

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    My project involves to be change the previously existing code and by implementing six new changes according to the description that I am uploading in files. The main requirement is that the project need to be satisfied creational patterns such as Abstract Factory Pattern, Builder Pattern and Singleton Pattern. And some instructions too.

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    Android Mobile Developer 6 天 left
    已验证

    Need a full-time Android Mobile Developer for SaaS Application Mobile Development. Mon thru Friday from 3.00 pm to 12.30 am IST.

    $9 / hr (Avg Bid)
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    Thiefimage -- 2 6 天 left
    已验证

    Trying to get facial images enhanced well enough to use facial recognition software

    $201 (Avg Bid)
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    12 个竞标

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