JavaScript is one of the most popular programming languages in the world. If you are looking for a website to be created with sophisticated interactivity or in search of an impressive mobile app, using JavaScript is the way to go. With the help of our expert Javascript Developers, you can bring your idea to life.

A Javascript developer on Freelancer.com can create dynamic web applications with extended features and improved user experiences. They can also design advanced gaming applications, develop cloud applications, and create powerful websites that work with less coding and low complexity.

Here's some projects that our expert Javascript Developers made real:

  • Developed interactive websites & apps with detailed user accounts experience
  • Created powerful applications that streamline complex data into actionable insights
  • Built custom Windows and Mac software designed to fit client specifications
  • Developed mobile apps that enables customers to access data from their phones
  • Connected databases to web interfaces with easy input/output functionality
  • Optimized existing code for faster loading pages and smoother user workflows

Javascript Developers on Freelancer.com know how to turn ideas into reality. They are experienced professionals dedicated to excellence and creating top-notch scripts that are easy to use, reliable and fast. If you have an idea but don’t know how to turn it into technical reality, Freelancer.com is the place to post your project. Hire our expert Javascript developers today!

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    692 trabalhos encontrados, preços em EUR

    Olá, quero automatizar apostas recebidas desse telegram 1º Queria poder mudar os valores de cada aposta das cores e do empate (aposta,gale 1 e gale 2 ) conforme eu nécessite. 2º Queria a opção de poder ou não apostar no empate. 3º Gostaria de apostar especificamente nesta casa de aposta Pinnacle() 4º obs: As apostas tem que ser 100% em sincronismo

    €434 (Avg Bid)
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    2 ofertas
    Sistema ERP 5 dias left

    Estou em busca de alguém com experiência que desenvolva um sistema ERP completo focado para oficinas mecânicas em Node.js.

    €2227 (Avg Bid)
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    Olá, abaixo está tudo o que o bot precisa fazer, o jogo em questão é o Bac bo, não há um prazo determinado. 1° Possibilidade de adicionar e remover padrões 2° Quantidade editáveis de gale(até 3 gales com valores editáveis) 3° Opção de cobrir empate 4° Opção de não considerar empate como perca 5° Valores editáveis de stopwin e stoploss 6° Valores de aposta editáveis 7° Funcionamento em casas de apostas definidas (betano e pinnacle

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    1 ofertas

    A ideia do projeto é super simples (web scraping), criar um "robô" que simule o acesso num site, efetue a autenticação (usuário/senha), em seguida verifique se determinada informação foi postada na página, caso positivo, o robô deve enviar um alerta, como uma mensagem no WhatsApp ou até mesmo uma ligação "fake" no celular, apenas pra avisar que a informação está disponível. Caso essa informação não esteja disponível na página, o robô deve efetuar um "refresh" (entrar em loop) até que esteja disponível, ou se possível, que possa ser configurável, por exemplo, rodar até determina...

    €115 (Avg Bid)
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    I am Looking for a Chrome Extension expert , we have one extension which we want same to same nothing special , if you can get it cloned that is also fine

    €13 (Avg Bid)
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    12 ofertas

    I am looking for a freelancer to create a landing page for product promotion. I have specific design ideas and elements that I would like to include in the page. Ideal Skills and Experience: - Proficiency in web design and development - Experience in creating landing pages for product promotion - Creative and innovative mindset to incorporate design ideas and elements provided by the client

    €18 / hr (Avg Bid)
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    I am looking for a freelancer who can help me with code optimization for my React website project. The main tasks involve manipulating the array and finishing up the project. Specific requirements for the project include: - Code optimization to improve the performance of the website. - Manipulating the array to ensure smooth functionality. - Assisting with any remaining tasks to complete the project. - It will require you to have experience with the rest interface as we'll be fetching and posting data in an API. Ideal skills and experience for the freelancer: - Intermediate, Expert level of experience with React - Strong understanding of array manipulation and code optimization techniques The deadline for the project is within the next week, so I need someone who can start immediat...

    €12 (Avg Bid)
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    Web Interface Development with Rough Idea of Functionalities using JavaScript We are looking for a skilled developer to create a web interface with a rough idea of the functionalities. The ideal candidate should have experience in JavaScript and be able to design a user-friendly and responsive interface. Key Requirements: - Proficiency in JavaScript and its frameworks - Strong understanding of web development principles - Ability to create a visually appealing and intuitive interface - Familiarity with responsive design and cross-browser compatibility - Attention to detail and ability to meet project deadlines Responsibilities: - Collaborate with the client to understand the rough idea of functionalities - Design and develop a user-friendly web interface using JavaScript - Implement res...

    €16 (Avg Bid)
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    5 ofertas

    Update my website, removed the old installation and installed the new one, I want my website to be indexed and I want my website to be accepted and approved through Google AdSense. fix my website performance and indexing issues on Bing and Yandex added Facebook and google login API. payment will be made when the website is error free and accepted by Google AdSense, and completed as I say in my description

    €50 (Avg Bid)
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    I am seeking a talented web designer to create a website for university past papers. I want the website to have a modern, minimalistic design. The website must also contain user login and registration features. There is already a sizeable collection of past papers available, so although some additional papers may be required to complete the library, I am expecting the majority of them to already be provided. To download a question paper the student will have to upload 3 more which will enable students to share questions papers with each other. I am not expecting any fancy animations or anything like that, but it should be visually appealing and user friendly. I am open to any suggestions on how to improve the website, so please feel free to make as many suggestions as possible.

    €162 (Avg Bid)
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    This is exactly how is works in the video. Contact me for more details

    €497 (Avg Bid)
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    42 ofertas

    Necesitaria modificar un mapa ya creado de leefleet. en html, css y javascript, el cual tiene marcadores de playas, al clikear un marcador sale un pop up con nombre de la playa, lo que quiero incluir alli en cada pop up, es informacion del clima. como temperatura, velocidad de viento, direccion de viento. Estube viendo proveedores de apis, como windy, pero me gustaria alguien que tenga mas experiencia en javascript para llevarlo a cabo.

    €134 (Avg Bid)
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    16 ofertas
    Odoo 16ee POS Modifications 6 dias left
    VERIFICADO

    My goal is to modify the Odoo 16 ee POS system to improve the user experience, and I am looking for someone to customize the user interface. Specifically, I am aiming to add more visual elements to the interface in order to make it more engaging. I need someone experienced with the Odoo platform who can customize the user interface with powerful visual elements to create a more satisfying experience for my customers. The modifications should also be able to stand the test of time so they can operate effectively for years to come. My hope is to find a creative freelancer who can take my project to the next level.

    €159 (Avg Bid)
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    11 ofertas

    We are looking for a full stack dev for ongoing work. Our goal is to provide this basic API project as a test to see how you do. This project will be for one aspect, google conversion tracking. Overview: ------------------------------------------------ When a conversion event occurs, we will post the event (purchase, addtocart, etc) to our new webhook system. The system will then lookup the correct conversion even and google account to post the data to. All responses, success/partial/failure will be recorded so we can fix the issues on on going basis. This will require a basic password protected web gui to view the tables, inbound webhooks, outbound api requests, responses, etc. Sample webhook (broken up to make easier to read) we might post to "" : ---------------------------...

    €486 (Avg Bid)
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    Opción 1 - Proxys: La extensión permite configurar un proxy y un puerto. Puede configurar un nombre de usuario y una contraseña para el proxy. Si no se agrega un proxy, la extensión utilizará la conexión de la PC por defecto. Opción 2 - Creación de Cookies: Permite subir un archivo de texto (txt) con palabras clave. Puede configurar si la extensión debe buscar palabras clave de forma aleatoria en el archivo txt. La extensión debe tener la opción de aceptar automáticamente las cookies en sitios web que muestran el banner de cookies. Opción 3 - Cantidad de Palabras: La extensión buscará una cantidad aleatoria de palabras entre un mínimo de 30 y un máximo de 45 palabras en...

    €6 / hr (Avg Bid)
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    5 ofertas

    Create a plugin for woocommerce. In dashboard plugin add User: Password: Token: Gain: Product details add a new field Postal Code This new filed is required to calculate the shipping cost for this product If all products have the same Postal Code the shipping cost will be 1, if two product have different postal code the plugin will calculate the shipping cost from two differente postal code to the client postal code. It's necessary user has to add his postal code in cart to calculate the shipping cost. Then with the product info: weight, length, width and height the plugin will calculate volumetric weight (length * width * height / 5000) and se wich is bigger weight or volumetric weight. in background plugin will do and ajax SOAP to get the available carriers.. The client cand sel...

    €20 / hr (Avg Bid)
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    quasar-vite with electron 6 dias left
    VERIFICADO

    I am trying to publish a version of my code for distribution. I am getting an error SQLITE_CANTOPEN. The distribution .exe file runs, but I cannot login because the database is not available. I need someone to guide me to fix it. I am using these versions: Operating System - Windows_NT(10.0.19045) - win32/x64 NodeJs - 14.19.0 Global packages NPM - 6.14.16 yarn - 1.22.17 @quasar/cli - 2.3.0 @quasar/icongenie - Not installed cordova - Not installed Important local packages quasar - 2.12.3 -- Build high-performance VueJS user interfaces (SPA, PWA, SSR, Mobile and Desktop) in record time @quasar/app-vite - 1.4.3 -- Quasar Framework App CLI with Vite @quasar/extras - 1.16.5 -- Quasar Framework fonts, icons and animations eslint-plugin-quasar - Not installed vue - 3.3.4 --...

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    Hi, This is the open-source code I'm using for analytics. It displays website visitors, visited pages, countries, etc. Among the given data I have Company IP. You'll find an example of the actual output in this link: Now, I have another local database that holds many company details such as name, business, social media, contacts, etc, and even their employees. What I want to do is : 1/ Using the IP coming from the open source, I need to display, on a new page, all the company data coming from my local database. So, a new API would be developed. 2/ Among the new data displayed, I need to have a link to the employees' list of that company. It should be displayed in a new page, tab, or popup (I'm open to any other user-friendly suggestion). So, another new API wou...

    €156 (Avg Bid)
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    Full Stack Django Developer 6 dias left
    VERIFICADO

    hi, we have a full react template and we want to develop a big django website like youtube. we needed an Django expert do manage our new team for this project and work on it.

    €1094 (Avg Bid)
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    My project is for a Full Stack Web Developer. As the project owner, I seek someone proficient in HTML/CSS, JavaScript, and Python. The main functionality I need on the website is e-commerce. My preferred timeline for completing the project is 2-4 months. So if this sounds like a project you are up for, I encourage you to apply.

    €25 / hr (Avg Bid)
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    I am looking for a skilled developer who can sync Hubspot with UPS to streamline our shipping label printing process. The ideal candidate will have experience with API integration and be able to work with Hubspot and UPS APIs. Key Requirements: - API Integration: The preferred method for syncing Hubspot with UPS is through API integration. - Data Fields: We only need the customer name and address from Hubspot for the UPS shipping labels. - Error Handling: We require detailed logs for error handling during the sync process. Skills and Experience: - Experience with API integration, specifically with Hubspot and UPS APIs. - Strong understanding of data fields and how to extract the required information for shipping labels. - Proficient in error handling and logging to ensure a smooth sync p...

    €459 (Avg Bid)
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    Requisitos: Experiencia demostrable en desarrollo web, con un enfoque en diseño responsivo. Conocimiento profundo de HTML5, CSS3 y JavaScript. Experiencia en WordPress: El candidato debe tener experiencia sólida en el desarrollo y administración de sitios web de WordPress. Esto incluye la capacidad de instalar, configurar, personalizar y mantener un sitio de WordPress. Experiencia en Elementor: experiencia en el uso de Elementor, ya que esta es una herramienta esencial para la creación de contenido y el diseño en tu sitio web. Deben estar familiarizados con la interfaz de Elementor y sus capacidades. Diseño web: experiencia en diseño web, incluida la capacidad de crear diseños atractivos y funcionales utilizando Elementor. Optimi...

    €15 / hr (Avg Bid)
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    I am writing to express my interest in the ongoing project and to offer my services as a proficient React.js and Node.js developer. With a strong background in both frontend and backend development, I am confident in my ability to contribute to the success of your project.

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    Looking for a front-end developer to re-create the front-end of some modules of my system in vuejs 3x with Tailwind css.

    €145 (Avg Bid)
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    82 ofertas

    I am looking for a full-time python developer with 2-4 years of experience to handle web development tasks for a web application development project. The ideal candidate should have experience in the following areas: Tasks: - Web development Type of project: - Web Application Development Time frame: - 1-3 months Skills and experience required: - Proficiency in Python programming language - Experience in web development using frameworks such as Django or Flask - Knowledge of HTML, CSS, and JavaScript - Familiarity with database systems such as MySQL or PostgreSQL - Understanding of software development principles and best practices - Strong problem-solving and debugging skills - Ability to work independently and as part of a team - Excellent communication and collaboration skills If yo...

    €279 (Avg Bid)
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    I am looking for an experienced developer to fix a functionality issue on an existing JSP page. The specific problem is with the form submission, as it is not working correctly. When the form submission fails, there is an error message displayed, which I can provide. Skills and experience needed: - Strong knowledge of JSP - Proficiency in form submission troubleshooting - Ability to identify and fix errors in JSP pages

    €10 (Avg Bid)
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    I need to integrate mapindoors with qliksense objects so for eg if user selects specific lat or longitude he should be able to go to specific floor for the adress. I am looking for someone expert in javascript and qliksense

    €19 (Avg Bid)
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    I am looking for a skilled web developer to build a website for personal use. The main purpose of the website is to provide a face-replacement feature, where users can swap one face for another in videos. The level of customization required for the face-replacement feature is basic, meaning that users should be able to simply swap one face for another without adjusting any features or expressions. In terms of design preferences, I am looking for a modern and minimalist style for the website. I want the design to be clean and simple, with a focus on functionality and ease of use. Ideal skills and experience for this project include: - Proficiency in web development languages such as HTML, CSS, and JavaScript - Experience with video editing and manipulation - Knowledge of face recognit...

    €18 / hr (Avg Bid)
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    120 ofertas
    Django webscraper Expert... -- 2 6 dias left
    VERIFICADO

    I need django backend Expert for Web Scrapper Application Strat your bid with django to be considered

    €12 (Avg Bid)
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    20 ofertas
    api fetching 6 dias left

    I am looking for someone to help me fetch data from a specific website. The data that I need to be fetched is user data , in the form of JSON, XML, or CSV. The purpose of fetching this data is so that I can use it to my advantage in the future. I am knowledgeable on this task, and I make sure that the safety of the data is kept as priority. Please let me know if you are interested in taking up this task.

    €84 (Avg Bid)
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    Fix jsp existing page issue 6 dias left
    VERIFICADO

    I am looking for an experienced developer to fix a functionality issue on an existing JSP page. The specific problem is with the form submission, as it is not working correctly. When the form submission fails, there is an error message displayed, which I can provide. Skills and experience needed: - Strong knowledge of JSP - Proficiency in form submission troubleshooting - Ability to identify and fix errors in JSP pages

    €3 / hr (Avg Bid)
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    Developer must work on PHP as a major development language to make following 1) Connect external API to do the booking cancelation / exchange 2) API documentation will be provided to follow the steps Expert developer will be able to do this in a day, future regular work will be guaranteed Key requirements: - PHP developer with experience working with external APIs - Proficient in retrieving data from APIs - Strong understanding of PHP and its frameworks - Familiarity with API documentation and integration - Attention to detail and ability to troubleshoot and debug code The deadline for this project is within a week.

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    Pose estimation to AR dress fit 6 dias left
    VERIFICADO

    Project Title: Pose estimation to AR dress fit Description: I am looking for a skilled developer who can help me with pose estimation for an AR dress fitting project. The main goal is to create a realistic and accurate virtual fitting experience for different types of dresses. Using Blazepose TF model and or Babylon.js. Level of Detail: - The AR fitting should provide a detailed fit for the dresses, with some minor inaccuracies allowed. - The developer should be able to ensure that the virtual dress fits the user's body shape and movements as closely as possible. Skills and Experience: - Experience in JavaScript and web technologies. - Experience in pose estimation and AR development is required. - Knowledge of computer vision and image processing techniques would be beneficial. ...

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    Hello, we have an Android WebView application developed in Java and are seeking assistance with two distinct tasks: ### Task 1 of 2: Excel Sheet Opening ### Currently, our app successfully downloads and opens an Excel sheet when using our test page. However, the application crashes when attempting the same on our customer's actual site. We suspect the issue arises due to the site utilizing blob URLs rather than pure data:// links. Our goal for this task is: - Ensure smooth downloading and opening of the Excel sheet from the customer's page. - Address issues with the Android download manager not downloading data from blob URLs. For this task, we will provide: - The existing Java code. - Demo login credentials. - Two video demonstrations: one showcasing the successful open...

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    ADC
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    I need a movie website 6 dias left
    VERIFICADO

    Project Description: I am looking for a skilled developer to create a movie website using custom coding. The website should have the following features and requirements: Features: - Movie database and search functionality - Movie trailers and reviews section - Responsive design for optimal viewing on different devices User Registration and Personalized Features: - User registration and login functionality is not necessary for this project Preferred Platform or Technology: - The website should be built using custom coding, rather than a specific platform or technology Skills and Experience Required: - Proficiency in programming languages such as HTML, CSS, and JavaScript - Experience in building dynamic websites with database integration - Familiarity with movie database APIs and searc...

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    Need help with mobile CSS 6 dias left
    VERIFICADO

    Hello I need help with mobile CSS, will need max one hour if work We pay 20 usd for the few tasks. Start asap Thank you

    €18 (Avg Bid)
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    89 ofertas

    Looking for tiktok tracking expert who can fix little issue. my titok tracking work perfectly but when i check on test event it show also empty event no idea. i have attached screenshoot please look thanks

    €19 (Avg Bid)
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    6 ofertas
    need 2 page web designer 6 dias left
    VERIFICADO

    Need Deposit page and Refferal / Affillieat

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    I need a web developer who is good with ui/ux design. He have to implement the website directly from idea. html, css javascript,

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    119 ofertas

    Looking for tiktok tracking expert who can fix little issue. my titok tracking work perfectly but when i check on test event it show also empty event no idea. i have attached screenshoot please look thanks

    €10 (Avg Bid)
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    4 ofertas

    I need a simple webpage with a form. The form will have the following fields: - First name, mandatory, at least one letter - Last name, mandatory at least one letter - Age or year born, age 16-120 and born year 1900 or younger - Zip code or city, zip is 4 digits, city at least one letter. We will have autocomplete. So if use starts to type either a zip or city, he will get a list of options to pick from (or keep on typing to make list shorter). If the user has started to type a zip, the options will contains both zip and city, but when the user selects one, we will store only the zip. - Email address, mandatory, valid email address - Send-button If something is wrong, we need to mark the field with error and give an error message below the field. When form is ok and Send is clicked: - up...

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    Yetishare Script 6 dias left
    VERIFICADO

    Hello, I need someone to manage my yetishare script. Thanks.

    €25 (Avg Bid)
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    30 ofertas
    SCHOOL MANAGEMENT SOFTWARE -- 2 6 dias left
    VERIFICADO

    I need a school management web app with the following features, AMONG OTHER USUAL FEATURES. It's for a primary and secondary school in Nigeria. 1. Proper site syncing without redirecting anyone to Thinkally 2. Prospect purchase of admission forms online 3. Online entrance examinations and other school examinations 4. Video Conferencing (live video lessons) 5. CBT questions to encourage direct upload or copy and paste of questions 6. Live chat box to attend to prospects directly in real-time. 7. No Thinkally advert on our SMS 8. School's workspace (Google Workspace with customised email addresses for members of staff) 9. Assured backup of data in the case of disengagement. Can our data with you be transferred to another platform or a storage device? I prefer someone who alreddy ...

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    Title: Advanced Java Programming Tutor needed for Online Sessions I am seeking a knowledgeable and experienced Java programming tutor who can assist with advanced level concepts. Topics and Areas of Focus: - Data Structures: I require guidance in implementing and manipulating various data structures in Java. - Object-Oriented Programming: I need assistance in mastering the principles and best practices of OOP using Java. - Algorithms: I am looking for a tutor who can help me understand and implement complex algorithms efficiently. Preferred Mode of Communication: - Online/Video Call: I prefer to have tutoring sessions conducted remotely, through a reliable online platform or video call. Ideal Skills and Experience: - Strong proficiency in Java programming, with a deep understanding o...

    €139 (Avg Bid)
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    Dev Support for GLPI 6 dias left
    VERIFICADO

    Dev Support for GLPI I am looking for a developer to provide support and assistance with GLPI, specifically in the areas of Customization and Plugin Development. Specific Requirements: - Customization and modification of existing plugins - Development of new functionalities or plugins for GLPI Ideal Skills and Experience: - Strong knowledge and experience with GLPI - Proficiency in PHP and MySQL - Experience with plugin development and customization - Ability to troubleshoot and fix bugs in plugins Duration: - The dev support for GLPI is on-demand and will vary based on the project needs.

    €12 / hr (Avg Bid)
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    43 ofertas

    Title: Advanced Java Programming Tutor needed for Online Sessions I am seeking a knowledgeable and experienced Java programming tutor who can assist with advanced level concepts. Topics and Areas of Focus: - Data Structures: I require guidance in implementing and manipulating various data structures in Java. - Object-Oriented Programming: I need assistance in mastering the principles and best practices of OOP using Java. - Algorithms: I am looking for a tutor who can help me understand and implement complex algorithms efficiently. Preferred Mode of Communication: - Online/Video Call: I prefer to have tutoring sessions conducted remotely, through a reliable online platform or video call. Ideal Skills and Experience: - Strong proficiency in Java programming, with a deep understanding o...

    €108 (Avg Bid)
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    4 ofertas
    develop a tool 6 dias left

    I am looking to develop a desktop application with an overall purpose of task automation. The tool should be developed for the purposes of making everyday tasks easier and more efficient. I do not have a preferred programming language, so expertise in all options is most welcome. I am open to suggestions about how best to create the tool and the most appropriate programming language so that it will be both effective and user-friendly. I want frontend tool for hall ticket generation. for an examination if i want to issue hall tickets to candidates, i have to create dynamic pdfs for each candidates, having their details, photo, signature, date of examination, time of examination etc etc. upto 4 pages of each hall ticket. Every time different format. Its more like mail merge but in mail merg...

    €100 (Avg Bid)
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    I have several problems in a custom made plugin, which means functions not working right on frontend. The site is a football statistics website: Plugin is made with PHP and JS. Also we have several cronjobs running daily and updating through API. After fixing the problems I want to know who can optimize the code / setup, since I guess threre are a lot of bugs and the cronjobs often stops and not getting finished (most likely because timeout or to much data). Right now I have list with 4-5 task, which needs to be fixed asap.

    €443 (Avg Bid)
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    150 ofertas

    I am looking for a WordPress developer who can adjust a Radio player in my project. I have this theme Wordpress: And i have this player: We need know how implement continuous audio playback using AJAX. Example: Skills and experience needed: - Strong proficiency in WordPress development - Experience in creating custom themes - Knowledge of AJAX for continuous audio playback - Ability to work with audio streaming technologies - Attention to detail in implementing design specifications

    €18 / hr (Avg Bid)
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    103 ofertas

    The app takes care of the student from registration for a course, leave management, facility management, faculty management, class scheduling and so on

    €662 (Avg Bid)
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    27 ofertas

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