API stands for Application Programming Interface, and it is an layer of interface that allows programs to interact with each other. An experienced API developer can build complex interactions between applications, making them faster, more reliable, and accurate. Whether you need a second opinion on your existing application or you want to create an entirely new application for your business, an expert API Developer can do the job for you.

An API Developer's job does not stop at developing. They can also work on design and implementation testing, guide through the entire architect process from prototyping to implementation, create custom system integration solution based on the project requirements, and collaborate with other teams to develop systems that meet customer expectations.

When hiring an API Developer through Freelancer.com, rest assured that they are as competent as any hired onsite software engineer.

Here’s some projects our experts have worked on:

  • Building custom interfaces to move large amounts of data efficiently between applications
  • Working with Javascript to allow websites to access external information relating to weather conditions
  • Creating Grafana dashboards for quick and easy visualization of data points
  • Developing scripts to connect external APIs with more heavy-duty platforms like Microsoft Azure
  • Debugging mobile apps involving fishing
  • Integrating AI capabilities into online shops
  • Automating regression tests so developers can work faster and more accurately

No matter what your business needs are in terms of API development, our expert freelancers are ready to take on the challenge and provide support whenever you need it. With expertise in debugging applications and web development, you're guaranteed to find the right developer for your project! So why wait? Post your project today at Freelancers.com and reap the benefits of working with an expert API Developer now!

From 180,176 reviews, clients rate our API Developers 4.86 out of 5 stars.
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    46 jobs found, pricing in USD
    GraphQL to create an open api 6 days left
    VERIFIED

    Hi! I'm looking to hire an experienced developer for a project that requires creating an open api using GraphQL. The purpose of the api is to integrate with third-party apps. I have a specific platform and language preference for the API development is GraphQL. The data to be handled has a moderate level of complexity. The ideal candidate should be highly knowledgeable in developing api’s with GraphQL, as well as comfortable with working with a specific platform and language. Ideally, you should also have experience in dealing with moderately complex data structures. If you think you would be a great fit for this project, please contact me.

    $1496 (Avg Bid)
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    15 bids

    I am looking for a skilled developer who can create a trading platform with basic features and requirements. The ideal candidate should have experience in Java programming and be able to complete the project within a timeline of 1-2 weeks. Specific features needed for the trading platform include: - Real-time streaming quotes: The platform should be able to fetch and load real-time quotes and options-chain in MySQL. - Place equity and complex option trades including advanced orders. - Fetch positions, balances and other account related details. A fully functional or UX is not necessary. Only void methods are needed to complete the following functionality: Fetch real-time market data: get quotes, get option chains, get option strikes, get option expirations, lookup option symbols, get hi...

    $365 (Avg Bid)
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    8 bids

    I am looking for a developer who can help me access CRM data from Microsoft Dynamics via API on my WordPress website. Here are the details of the project: Functionalities: - The main focus will be on accessing CRM data from Microsoft Dynamics. - Sales data and inventory data are not required for this project. Data Presentation: - I have a detailed plan for how I want the data to be presented on my website. - The developer will need to follow the specific layout and design requirements. Security Measures: - I have specific security requirements that need to be implemented. - The developer should have experience in implementing security measures for accessing Microsoft Dynamics via API. Ideal Skills and Experience: - Strong knowledge of Microsoft Dynamics and its API. - Experience with W...

    $128 (Avg Bid)
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    35 bids

    I have an excel file with all the data that needs to be uploaded via click up API and also attaching a pdf while making request. Let’s connect on chat to discuss more

    $30 (Avg Bid)
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    4 bids

    Project Description: Fixing Zapier SSL Certificate Error - I am experiencing an SSL certificate error with Zapier and need it fixed as soon as possible. - I have access to my server's SSL configuration details. - The deadline for fixing this issue is ASAP. Ideal Skills and Experience: - Strong knowledge and experience with Zapier and SSL certificate management. - Expertise in troubleshooting and resolving SSL certificate errors. - Familiarity with server configurations and SSL configuration details. - Ability to work quickly and efficiently to meet tight deadlines.

    $36 (Avg Bid)
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    15 bids
    API Setup & Configuration 6 days left
    VERIFIED

    We require someone to assist in the setup troubleshooting and configuration of our API project in the cloud. This project has a maximum budget of $180.

    $154 (Avg Bid)
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    48 bids

    We are looking for a skilled team with expertise in both Node.js for backend development and Windows-based application development for our integrated biller services API project. The robust backend will be built using Node.js and will run on Kubernetes, managing various modules like API Gateway, Data Transformation, and more. The Kiosk application, running on Windows 10, will interact with the backend to provide biller services. A strong background in secure API connections, real-time updates, and system monitoring is essential. Detailed project plans and specifications will be shared with the shortlisted candidates. Please write green at the beginning of your proposal if you read this and you can work on both platforms/coding languages. Proposals without it will be ignored

    $15288 (Avg Bid)
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    90 bids

    I am looking for a skilled Senior VueJS developer to help me migrate/rebuild my VueJS frontend to Vue3. Job Details: We are currently looking for a skilled Vue developer to join our team for a short-term project, lasting between 1 to 2 months, depending on the pace of the development process. The primary goal of this project is to migrate/rebuild an existing VueJS-based frontend to Vue3. Additionally, the developer will be responsible for incorporating new features based on API connections. Project Overview: Duration: 1 to 2 months Primary Objectives: Migrate/rebuild VueJS frontend to Vue3 Implement additional features based on API connections Requirements: - Experience in VueJS 2 and Vue3 - Familiarity with the differences and new features in Vue3 - Ability to implement ...

    $2039 (Avg Bid)
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    60 bids
    Klaviyo Api integration 5 days left
    VERIFIED

    I'm looking for someone to help me integrate the Klaviyo API with Lightspeed eCom. There's a Klaviyo app available for Lightspeed, but it's designed for Lightspeed POS and doesn't cover eCom.

    $174 (Avg Bid)
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    37 bids

    I am looking for an experienced Google Chrome Extension developer to build a translation and captioning tool. Project Overview: The extension should be capable of: Translating text from any language to the user's desired language. Automatically detecting and adding captions to videos played on web pages. Key Requirements: Expertise in Chrome Extension development. Familiarity with relevant APIs, such as Google Cloud Translation and Google Cloud Speech-to-Text, or alternatives. Strong background in JavaScript, HTML, and CSS. Ability to design a user-friendly and intuitive UI/UX for the extension. Respect for user data and privacy - no unnecessary data collection, and clear communication about any required permissions. Proven track record of developing extensions or similar projects. ...

    $424 (Avg Bid)
    NDA
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    29 bids

    I am searching for API experts who have experience in utilizing various APIs, ideally knowledge of game devs. api's as Valve API, Blizzard, EA Games, and more. Ideal candidates should have a strong background in API integration and be familiar with the specific APIs mentioned above. For their application, successful freelancers should include their past work and experience in working with APIs. This is an ongoing work opportunity, providing the chosen freelancer with continuous projects and collaborations.

    $39 / hr (Avg Bid)
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    27 bids
    Pinduoduo API 5 days left

    I am looking for someone who speak on Chinese language and can help me to get token of Pinduoduo API. You should login to my Pinduoduo developer account and fill all requested data to get access to API key. Please, write me only if you have same experience

    $23 (Avg Bid)
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    6 bids

    I'm looking for a skilled Ruby on Rails developer to build a backend for a file hosting application. It will need to include functionality for file upload and download, as well as a payment gateway and a user management. The project will take advantage of PostgreSQL as the database of choice. The application will need to meet high security and encryption standards with robust user management. Providing an intuitive user experience with a secure, reliable and easy-to-use interface are key features I’m looking for in this project. Experience designing large scale web applications would be an advantage. If you're confident in your skills and have a great track record of delivering successful projects, then I'd love to hear from you.

    $10 / hr (Avg Bid)
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    11 bids
    Netsuite Api sync 5 days left
    VERIFIED

    Project Title: Netsuite Api sync Description: I am looking for a developer who can help me with syncing sales orders from NetSuite to our fulfillment center using API. The ideal candidate should have experience working with Netsuite API and be familiar with its integration process. We will also be looking to bring tracking information from the fulfillment center back into netsuite Requirements: - Ability to sync data Netsuite API in real-time. - Experience with real-time data synchronization. - Familiarity with Netsuite API and its capabilities. - Proficient in programming languages used for Netsuite integration. - Knowledge of best practices for data synchronization. This project requires the developer to sync sales orders with Netsuite API in real-time. The ideal candidate should ha...

    $862 (Avg Bid)
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    96 bids

    I am looking for a freelancer to help me create a DMN (Decision Model and Notation) and Workflow on JBPM. The purpose of this project is decision-making and simple workflow design, as I need to automate certain processes and integrate them with other systems. Requirements: - Experience with DMN and Workflow creation on JBPM / Kogito - Proficiency in using specific tools and methods that I will provide - Ability to handle a simple project with ease If you have the necessary skills and experience, please submit your proposal.

    $498 (Avg Bid)
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    We currently have an API that pulls data from our Project Management software, Procore, into PowerBI. We would like a few new workspaces to show us additional data/dashboards. Data would be pulled from multiple fields in Procore and give us information such as: Win rate by month, state, city, estimator, architect.

    $12 / hr (Avg Bid)
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    15 bids

    looking for a Laravel dev using lunarphp to develop a car dealer api for a app. Similar to

    $13 / hr (Avg Bid)
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    108 bids

    We Backend completed and need development in frontend . Key Responsibilities : 1. Flutter App Development 2. Node.js API Building 3. API Integration 4. Collaboration 5. UI & UX

    $132 (Avg Bid)
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    20 bids

    I am looking for a developer who can help me implement the TecDoc API for parts search on my eshop that uses Joomla platform (VirtueMart). The ideal candidate should have experience in implementing APIs on Joomla and be familiar with the TecDoc API. The main requirements for this project are: - Implement the TecDoc API on my Joomla platform for parts search functionality. - Ensure seamless integration and compatibility between the TecDoc API and Joomla. - Optimize the performance of the API to ensure fast and accurate search results. - Troubleshoot and resolve any issues or errors that may arise during the implementation process. Skills and Experience: - Proficient in Joomla development and customization. - Experience in implementing APIs on Joomla. - Familiarity with the TecDoc API and...

    $1291 (Avg Bid)
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    41 bids

    We have 23 API 's which require completion of adding to our environment which is based on WSO 2 and Choreo. We require assistance in completing the setup of them.

    $153 (Avg Bid)
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    16 bids

    There is a program that was written by a freelancer earlier that could parse some messages from discord channel which give options trading signals and trade those stock options using API with a trading account. The code is already there in python for it and some setup instructions. Only thing that is needed is to do setup of that program on my system. It can be done either if I give remote access to my system or otherwise do the same locally on your system and if it works, can replicate the same steps on my system. If there are any bugs and need some fixes, that has to be done and resolved. The program should be working and we should be able to see the results. If you already have trading account with Interactive brokers than that would be ideal as you can set in up yourself in your loc...

    $110 (Avg Bid)
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    22 bids

    I am in need of a React coder who can work with APIs. The ideal candidate should have expert level experience in React. Project Requirements: - Develop and implement React components that integrate with the 3rd party API - Ensure seamless integration and functionality of the APIs within the React application Skills and Experience: - Expert level proficiency in React and JavaScript - Strong understanding of API integration and usage - Familiarity with backend technologies and data flow - Strong problem-solving skills and attention to detail Timeline: - The project has a specific deadline. Further details will be provided to the selected candidate. Note: Please include relevant portfolio or project examples showcasing previous experience with API integration in React.

    $184 (Avg Bid)
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    123 bids

    I am looking to create a web application with backend functionality made with the Flask framework. It is important that the application include data management capabilities which is why I am open to database suggestions. This project will involve building a web application with functionality necessary to complete the desired objectives. Additionally, I would like to include the code for the home page, the booking page, and the end page. Please provide a GitHub link where I can access the information and copy the code. Also, please include an API.

    $140 (Avg Bid)
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    16 bids

    MAXIMUM - $4,000 USD DO NOT WASTE YOUR TIME OR MINE IF YOU DO NOT HAVE THE CRM BUILDING EXPERIENCE TO COMPLETE THIS PROJECT. YOU MUST PROVIDE PROOF OF YOUR CRM BUILDING EXPERIENCE. This project will require the freelancer awarded the project to sign NCA and NDA documents. Complete the project within 30 days. Build a CRM capable of Calling, SMS, Emailing, and RVM. CRM REQUIREMENTS: The system should be capable of the user calling up to 5 different phone numbers for each PRIMARY contact. The system should be capable of the user leaving a ringless voicemail for up to 5 different phone numbers for PRIMARY contact. The system should be capable of the user sending 5 SMS for each PRIMARY contact. The system should be capable of the user emailing up to 5 different email addresses for e...

    $4044 (Avg Bid)
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    59 bids
    coding a trading bot 4 days left
    VERIFIED

    I am looking for an experienced freelancer to code a trading bot that will be used on the tastytrade platform. The ideal freelancer should have a track record of successfully developing and coding trading bot solutions in the past. The bot should implement options trading strategies. If you think you have the skills and experience to take on this project, please include your relevant credentials in your application.I look forward to hearing from you.

    $1326 (Avg Bid)
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    23 bids

    We are seeking an experienced developer to create a custom plugin app for our Shopline e-commerce platform. The primary functionality of this plugin will be to modify the standard URL structure Shopline generates, specifically by removing the 'collections' and 'products' segments from the URLs. Objectives: URL Customisation: The plugin must allow Shopline store administrators to customise their URL structure by removing unnecessary path segments like '/collections/' and '/products/' from the standard URL structure. The goal is to have cleaner, more concise, and user-friendly URLs. SEO Maintenance: While altering the URL structure, it's crucial to maintain SEO best practices. The plugin should automatically handle 301 redirects to ensure...

    $305 - $914
    Sealed
    $305 - $914
    68 bids

    Need someone to create api design using There are 30 database tables/models and would like to create CRUD - Create, Read, Update, Delete, List and 10 custom endpoints. I have nearly all of the endpoints defined in a word document and need it created and api design tool. Once the creation of the api, models etc has been done in spotlight, I would like to use it to export the documentation

    $287 (Avg Bid)
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    21 bids

    Copy-pasted bids will be rejected. We are working on a project where we have a printer(USB printer) and we want to make it wireless. So essentially we are looking to build a system that can be connected to the printer on the USB port which will do all the mods. We are open to suggestions. Operation: This system must show up as an air printer on phones and computers. the way it does for actual air printers. Once the user sends a print command to this air printer, the system must receive that and send that file to a server, AWS or anything else that can work for 1000 devices without an issue. Once the server receives the file, it must be able to make some changes to the file, mostly the pdf/image would be cropped and rescaled to a preset dimension. Once this is done, the server sends this c...

    $11 / hr (Avg Bid)
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    8 bids

    I need this completed Quickly Integrate into the existing WordPress Site Supporters Login/Renew Directory Forum Bylaws Hall of Fame HOF Application Search HOF Members Wall of the Fallen/Survivor Fund Wall of the fallen form Survivor fund form Survivor Fund FAW and policies Search the wall Make a Pledge

    $164 (Avg Bid)
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    Python Developer Needed to Debug Backend Code within 24 Hours Skills and Experience Required: - Strong proficiency in Python programming language - Extensive experience in debugging backend code - Familiarity with database management systems Project Details: We are seeking a Python developer to help us debug a backend code that is causing issues. The code is written in Python, and the problem lies in the backend. We need someone who has a strong understanding of Python and experience in debugging backend code. The ideal candidate should be able to quickly identify and resolve the issues within 24 hours, as we are looking for a fast turnaround time. Familiarity with database management systems is also required, as the code interacts with the database. If you have the necessary skills an...

    $82 (Avg Bid)
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    21 bids
    Web development 3 days left
    VERIFIED

    Hello, I am looking for someone to make a plugin project for WordPress, a custom website with integration to apirestful He must know: -Create plugins in WordPress (mainly to create posts and upload files) -PHP, HTTP Method Server, APIRestFul

    $479 (Avg Bid)
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    116 bids

    Flight, hotel and car booking with all functionalities of multi vendor ecommerce system

    $436 (Avg Bid)
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    41 bids

    Looking for someone who can set up Google Sharer Drive with Rclone login auth and Direct Download Method

    $20 (Avg Bid)
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    9 bids

    I am looking for a skilled developer/agency to build a ChatGPT based Resume Builder for Finance Professionals The interface and features will be quite similar to Please familiarize yourself with - our product will be very similar The flow is this: Step 1: The user is asked a few questions such as qualification, areas of work experience etc. e.g. The user is a Chartered Accountant having experience in Internal Audit Step 2: This data should flow into the prompts I have developed. (The developer does not need to design the prompts, I have good prompts with me) e.g. I am a Chartered Accountant with experience in Internal Audit. You are a professional resume consultant. Give me points to write in my CV. Ensure that they are specific, contain action words, showcase impact and give quantitat...

    $346 (Avg Bid)
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    19 bids

    My project is to customize my Wialon dashboard application with special layout and design, based on specific design references that I have. I am looking for a specialist who can program this application according to my needs. Once the project is completed, I desire that the specialist provide ongoing support for any major issues that could arise. Need a very simple one-page dashboard with Login/Logout screen for device/object visibility Screens: 1) Login 2) Main Dashboard with overall device status for logged in user and left side menu 3) Menu Items e.g. Device Summary, Fuel Summary Report Data must be populated using Wialon API and web based fully responsive application development.

    $366 (Avg Bid)
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    I am looking for a freelancer who can build a system for fulfilling orders and managing my Etsy account. Features Needed: - Order fulfillment: The system should be able to handle the process of fulfilling orders efficiently. - Inventory management: It should have the capability to manage inventory and keep track of stock levels. - Sales analytics: I would like the system to provide sales analytics and reports to help me analyze my Etsy business. Integration with Other Platforms: - Yes, I require integration with other platforms to streamline the order fulfillment process and sync data across different systems. Order Volume: - I typically fulfill 100-500 orders in a month, so the system should be able to handle this volume efficiently. Skills and Experience: - Experience in developing ...

    $12 / hr (Avg Bid)
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    34 bids
    Configure API's 1 day left
    VERIFIED

    We require assurance in setting up our API's on the Choreo platform. Please only respond if you have experience with this product. They have already been setup and only require assistance in configuring them. The budget for this project is $40 as it is only config changes on the environment.

    $22 (Avg Bid)
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    13 bids

    We are seeking an experienced and talented WordPress developer to join our team on a long-term basis. Specific Wordpress development skills we are looking for include: - Theme customization - Plugin development - Website optimization - API integration - Website Designer - Website Developer Our ideal candidate would have an advanced level of experience in WordPress development. The expected duration of the project is long-term, lasting more than a month, with potential for full-time. If you have a strong background in WordPress development and are looking for a challenging and rewarding opportunity, we would love to hear from you. Join our team and contribute to the success of our projects.

    $20 / hr (Avg Bid)
    NDA
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    138 bids

    I am looking for a full-stack developer for a multi-vendor eCommerce platform project I'm working on. I prefer the development to be done in PHP, with MySQL as the database management system, and LARAVEL as the eCommerce platform. I require that the developer possess the knowledge and experience necessary to customize the template designs, build the back-end logic & front-end, and ensure scalability. You should understand modern frameworks, have expertise with JavaScript and its libraries, and be comfortable working with APIs. I expect the developer to have an in-depth knowledge of object-oriented principles and design patterns so that the code can be extended and maintained easily. The application is mission-critical, so robust debugging and testing skills are a must. As the app...

    $3964 (Avg Bid)
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    I am looking for a C# developer with experience in Dot Net Core and MVC to help me with my project. I need to fetch 1 million records from a Dot Net Core API within 2-3 seconds and display them in a jQuery datatable on the MVC UI application. Skills and Experience Required: - Strong knowledge of C# and Dot Net Core - Experience working with APIs and fetching large amounts of data - Familiarity with MVC architecture - Proficient in jQuery and datatable - Ability to optimize performance to achieve a response time of 3 seconds or less Specific Requirements for UI Presentation: - The UI presentation should be detailed and comprehensive, providing all the necessary information for the user - It should be able to handle mixed data, including textual and numerical data - The UI desi...

    $499 (Avg Bid)
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    Hi, We are looking for a Senior JavaScript developer to write a script to be used on website's header to: - Track if the website user is coming from a Google Ad Campaign - If yes, then pass on the below information to an API call: --- IP Address of the user, Serial number for the website (pre-defined in JS), Google analytics session code (if GA is installed already), User's device info (OS, Browser, Screen) We are open for discussion, but the selected developer can decide if the code is to all inclusive in the header (if it has a small footprint) Or code can call another script when conditions are matched to send information to the API. We need the code to be very optimised, have a small(est) footprint and size, and just works every time :) Ideally JS code is to be written in...

    $30 - $250
    Sealed
    $30 - $250
    31 bids

    Explicit Filtering Phase project as discussed in chat for phrase detection and resultant redirect.

    $470 (Avg Bid)
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    29 bids

    Цель проекта: Разработать чат-бота для обработки запросов клиентов и предоставления технической поддержки.

    $457 (Avg Bid)
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    Aplicaciones de consola con ejecutable .bat que lea archivos json de una carpeta y envie mediante una api Aplicación debera distinguir entre los tipos de documentos json y enviar cada tipo a su json correspondiente La aplicación debera generar una carpeta con logs despues de ejecutar la accion La aplicacion debera mover los archivos json ya insertados a la api hacia otro carpeta de procesados

    $141 (Avg Bid)
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    29 bids

    necesito un desarrollo de e-commerce con WordPress, diseño(plantilla), implementación de pasarela de pago, redes sociales. Aparte necesito que la persona que haga este desarrollo tenga conocimientos en consumo de API REST, ya que necesito que desde la api pueda llenar los productos en la pagina ejemplo: fotos, precio, descripción, etc esto es la documentación de la api

    $198 (Avg Bid)
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    55 bids

    Halo saya ingin membuat sistem untuk menarik mutasi dari ewallet Dana . Bisa multiple login akun dana Bisa cek mutasi dan detailnya Cek saldo Apabila bisa untuk ewallet lain seperti gopay , ovo dan linkaja akan lebih baik silahkan tawarkan penawaran anda

    $533 (Avg Bid)
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