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 187,968 reviews, clients rate our API Developers 4.87 out of 5 stars.
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    37 jobs found, pricing in NZD

    looking for some one expert on python and how to use huggingface models llama3 an how install any model from huggingface and create API with python with JSON to consume it by Another and have experianse on tranning LLama3 to make it able to learn i want this expert to train a team from 4 people online to do this - know the basics of llama3 - how to use huggingface models - create API with python with JSON to consume it by Another - training LLama3 to our own data

    $743 (Avg Bid)
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    I'm seeking a professional API developer to help me create a Chatbot API that will seamlessly integrate with multiple third-party systems, primarily Twitter, Facebook, WhatsApp, Snapchat, and TikTok. Key Responsibilities: - Develop a Chatbot API that can facilitate communication and transactions among different platforms. - Specifically, the API should be able to: - Implement an automated customer service bot using the source file provided understand text and Pic and reply accordingly to the customers in real time using your api and acounts as demo. Ideal Candidate: - Proven experience in API development, particularly within social media and messaging platforms. - Familiarity with Twitter, Facebook, WhatsApp, Snapchat, and TikTok APIs. - Knowledge of chatbot development and the...

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    I have a Shopify store and Catalogue A, an online jewelry wholesale catalogue. I'm looking for a skilled developer who can link the two using API requests. Key Requirements: - Linking my Catalogue A with my Shopify store. - Implement Product listing synchronization from to Shopify. Ideal Skills and Experience: - Prior experience with Shopify and API integration. - Proficiency in working with e-commerce web development sites. - Familiarity with jewelry and e-commerce industry is a plus. Please note, I have API access credentials for Stuller readily available. The main focus of this project is to ensure that all products listed in Stuller are synchronized and updated on my Shopify store. If you're confident in your ability to do this efficiently and accurately, feel free to...

    $640 (Avg Bid)
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    I am looking for a skilled programmer with experience in algo trading using Python - preferably with experience with crypto exchange API. I already have a specific strategy in mind, so I would like someone who can work with me to implement it. Ideal skills for this job include proficiency in Python and experience in API trading. I am looking for a programmer who can work with me on a long term basis with support. Details can be discussed.

    $25 / hr (Avg Bid)
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    Language: Python Description: I am currently developing a Python application using PyQt to integrate with the Vipps payment API. The application is intended to initiate a payment process through Vipps, and upon successful completion of the payment, it should update the GUI to indicate a successful transaction or revert to the initial state if the payment fails or is aborted. Problem: The main challenge I am facing is that the application does not correctly detect and handle the completion of the payment process. Specifically, the application struggles to: Detect when a payment has been successfully completed or when a payment has failed. Execute subsequent actions based on the payment's outcome. This issue appears to be related to the handling of the API's responses and the a...

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    Multi-Website Price Scraping 5 days left
    VERIFIED

    I need a professional who can scrape product prices from Starbucks and Dunkin Donuts' websites. The main focus will be Coffees, Beverages, and Food items. Key Requirements: - Scraping: Extract product name and price from two apps/websites. - Data Organization: Provide the scraped data in a clean and organized format. Ideal Skills: - Proficient in Web Scraping: Experience in scraping data from various websites. - Data Management: Ability to organize and present scraped data efficiently. This project will require attention to detail in maintaining the data integrity throughout the scraping process. The scraped information should be accurate and up-to-date.

    $17 / hr (Avg Bid)
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    React CRM Development 5 days left
    VERIFIED

    ** If your English level is not fluent, please do not bid ** I'm in need of an experienced React developer, proficient in user authentication, data visualization, and responsive design, to craft a CRM application. Key requirements: - User Authentication: Create a secure login system to ensure the safety of our customer's data. - Data Visualization: Implement interactive graphs and charts to help us analyze customer interactions and make informed decisions. - Responsive Design: Ensure the application is user-friendly and functional across all devices. In addition, the CRM must integrate seamlessly with a customer support ticket system, allowing us to manage client inquiries efficiently. Your expertise in React and CRM development will be essential to the successful completio...

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    I'm looking for a developer who can implement Google Apps Script and the Shipsgo API in order to create custom functions and track containers/Bill of Ladings. Shipsgo : Key Responsibilities: - Develop custom functions using Google Apps Script - Implement Shipsgo API for shipment tracking - Ensure the system can manage more than 500 daily shipments efficiently Skills & Experience: - Proficiency in Google Apps Script - Experience with Shipsgo API (or similar APIs) - Previous experience with data processing - Strong problem-solving and system optimization skills I have already developed something and I need some additional inputs (foundations have already been setup and I simply need some further features through the API - API returns a Json response).

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    Please do not use AI to bid, it will never be accepted. We are seeking a highly experienced Senior React Developer who has a proven track record of working with Solana. As a Senior React Developer, you will be responsible for developing and maintaining high-performance applications using React and Solana. This role requires a deep understanding of React language and Solana blockchain technology. You will collaborate with our team to design and implement efficient and scalable solutions. The ideal candidate should have excellent problem-solving skills, strong communication abilities, and a passion for clean and efficient code. Skills required: - Strong experience with React - Solid understanding of Solana blockchain technology - Proficient in designing and developing efficient and scalabl...

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    We are seeking a highly skilled Python developer with expertise in Microsoft 365, Azure, and Selenium automation to develop a sophisticated account management and reporting system. This project involves integrating Microsoft 365 with Bitwarden or a secure credential management system, automating user account management, and implementing Selenium scripts for login verification and automated reporting from web portals. Responsibilities: Integrate Microsoft 365 and Bitwarden APIs to automate the creation and management of user accounts and secure credentials. Develop and maintain Selenium automation scripts to validate logins and pull reports from web portals. Implement robust error handling and reporting mechanisms for failed logins and other issues. Schedule automated task...

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    I'm seeking a professional who can help me to integrate vapi and gohighlevel. Freelancer who has already experience will be easy to do this. If I confirm, then I will release immediately.

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    We are seeking a highly experienced Senior AI Engineer who has a proven track record of working with Solana. As a Senior AI Engineer, you will be responsible for developing and maintaining high-performance applications using AI and Solana. This role requires a deep understanding of Rust programming language and Solana blockchain technology. You will collaborate with our team to design and implement efficient and scalable solutions. The ideal candidate should have excellent problem-solving skills, strong communication abilities, and a passion for clean and efficient code. Skills required: - Strong experience with AI - Solid understanding of Solana blockchain technology - Proficient in designing and developing efficient and scalable applications - Excellent problem-solving and troubleshoot...

    $81 / hr (Avg Bid)
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    Algo Trading setup 3 days left
    VERIFIED

    Algo Trading setup Description: We are seeking an experienced individual in algorithmic trading and API integration to assist in setting up automated trading signals. Our algorithm, currently operating on the TradingView platform, generates precise buy and sell signals. However, we require assistance in seamlessly translating these signals into actionable trades on our trading platform. The primary objective of this project is to integrate our existing algorithm with the trading platform's API to automate the execution of trades based on generated signals. The selected freelancer will be responsible for establishing a robust connection between the algorithm and the trading platform's API, ensuring timely and accurate execution of orders. Key tasks include: 1) API Integration:...

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    small tasks: I need a professional to integrate Matecat API with my existing Chrome extension so as to calculate word count. The ideal freelancer for this project must have: - Previous experience with API integration - Understanding of JavaScript and Chrome extension development - Knowledge or experience with Matecat would be a major advantage The features I require are: 1. Trigger for Word Count: The word count operation should begin by using the Matecat API. 2. Word Count Results: The results of the word count computation should be displayed as a pop-up on the screen. If you have extensive experience with API integration and feel confident in tackling this project, I invite you to bid.

    $71 (Avg Bid)
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    I'm in need of a skilled Flutter developer with knowledge of ONNX model integration for offline classification. I will provide the model in that format and also the flutter project. I need you to integrate so tbat it runs offline on device. They are finetunes distilbert model. My budget is 30 euros and 2 days maximum. If you are interested only then bid

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    Algo Trading API setup Description: We are seeking an experienced individual in algorithmic trading and API integration to assist in setting up automated trading signals. Our algorithm, currently operating on the TradingView platform, generates precise buy and sell signals. However, we require assistance in seamlessly translating these signals into actionable trades on our trading platform. The primary objective of this project is to integrate our existing algorithm with the trading platform's API to automate the execution of trades based on generated signals. The selected freelancer will be responsible for establishing a robust connection between the algorithm and the trading platform's API, ensuring timely and accurate execution of orders. Key tasks include: 1) API Integrati...

    $398 (Avg Bid)
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    I am looking to find someone with Sage 200 on premise knowledge to find out how to connect to the API. I have the api_status url working but cannot find what the url should be for the API calls. The documentation seems to be for the cloud connection not a on premise setup. So looking for someone who has done that before to give a hand. Need someone with knowledge on Sage 200 API setup on premise.

    $56 / hr (Avg Bid)
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    I need a professional with experience in API integration and data handling to assist me with incorporating meter reading systems Tehama, Cereniti, and Inovonics into our existing system. This integration is referred to as MDM, or meter data module, with our software provider Utility Trackr. Key Project Requirements: - Extracting specific data: The project requires the extraction of meter readings, property information, and other necessary data from the aforementioned meter reading systems. Specifically, I need to extract Meter ID, Unit ID, and Date of read, Current Read. Dual transmitters require a unique ID. - Generating CSV or Text files: The extracted data should be organized and formatted into CSV or TXT files. Each property in the system should have its own file containing the relev...

    $960 (Avg Bid)
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    I’m looking for a Flutter Developer who can integrate in-app purchase to my existing Flutter Project. My Backend is built on Laravel and I can provide API’s for Packages and Subscription. Need Android, iOS, Windows and MacOS in App Purchase integration. My budget is CAD$100 and anyone bidding over $100 will be ignored. Need to complete it in the next 3-4 days.

    $172 (Avg Bid)
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    I'm looking for someone to create an API connection between Zapier/google sheets and Hubstaff. Our end goal is to automate the creation of client, project and geofence locations in Hubstaff whenever a row gets filled with data in google sheets, essentially populating Hubstaff with the same jobs as what is in google sheets. Currently I have an automation which copies the job name and location from into a google sheet so I am hoping you are able to set up an API that can read this Google sheet and create a client, job, geofence location (100m radius)m Select all team members, automatic timer to start and stop upon entering/leaving radius. Key Project Requirements: - Transfer of job details and customer information from Zapier to Hubstaff. - A good understanding of Zapier and Hubstaf...

    $191 (Avg Bid)
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    I'm in urgent need of a skilled developer who can integrate a product API into my Shopify store. Key Requirements: - Full Product Synchronization: Ensure all products from the API are properly integrated into my Shopify store, with accurate information and formatting. - Inventory Management: Keep track of stock levels and ensure that they match with the API. - Order Management: Ensure orders are properly updated and synced between my store and the API. - Pricing: Full control over pricing, ensuring it's accurate and in sync with the API. I need this project completed ASAP, so I'm looking for someone with solid experience in Shopify app development and API integration, preferably with Amazon, eBay or Walmart product APIs. Please only apply if you can start immediately and d...

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    I am in need of an experienced developer to create a custom Google Sheets Add-On that will enable data import/export, custom formatting and seamless integration with Plaid API. Key Project Requirements: - **Data Import/Export**: The add-on should facilitate the smooth import and export of data in and out of Google Sheets. - **Custom Formatting**: The tool should allow for flexible, user-defined formatting options for the data within the sheets. - **Plaid API Integration**: The developer should be well-versed in integrating with the Plaid API, ensuring a seamless and reliable connection. Ideal Skills and Qualifications: - Proven experience in Google Sheets Add-On development. - Strong background in custom software development and API integration. - Familiarity with Plaid API is a signific...

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    We are looking for a skilled full-stack web developer with expertise in Golang for back-end development and ReactJs for front-end development. The ideal candidate will have hands-on experience in developing web applications using these technologies. Responsibilities: - Collaborate with the team to design and develop high-quality web applications - Write clean and efficient code in Golang for the back-end - Develop user-friendly and responsive front-end components using ReactJs - Integrate APIs and third-party libraries as needed - Troubleshoot and debug any issues that arise during development Skills required: - Proficiency in Golang programming language - Strong knowledge of ReactJs and its core principles - Experience with RESTful APIs and web services - Familiarity with Git version co...

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    I'm urgently seeking an experienced developer proficient in and Payload CMS. Your task will be to create a user-friendly Institution profile listing/rating platform. Primary Features: - Search functionality: Allows users to easily search for institutions - Institution profile creation: A space for institutions to create comprehensive profiles Institution Profile Contents: - Name and logo of the institution - Contact information such as address, phone number, and email - Clear and compelling institution’s mission statement and description - Visual content: Photos and videos demonstrating institutional environment and facilities - A detailed section on programs and courses offered - User reviews and rating system: Encouraging candid user feedback for prospective users' und...

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    We are looking for a skilled and experienced full-stack developer.

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    Chargebee integrations 13 hours left
    VERIFIED

    I want to create an automatic billing system with chargebee and gocardless for getting money from clients in an automatic way depending on the usage of the product (online ordering ofr restaurants)

    $27 / hr (Avg Bid)
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    As the driving force behind our new project, I'm searching for an advanced Python programmer who can bring a wealth of expertise and precision to the table. -Ideal Skills and Experience: • Proven skills and experience in Python programming • Ability to adapt to the project's complexity and provide innovative solutions • Effective communication skills to handle any discrepancies professionally To ensure a perfect match, I'd appreciate it if your application could provide: • Detailed project proposals: Please outline your approach to Python coding projects, paying close attention to how you plan, execute and troubleshoot during the development phase. API skills are a part of the solution, so knowledge and competencies in this field are also re...

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    I am seeking a web developer with vast experience in creating functional, user-friendly websites that provide trading services. Key project components: 1. **Internal Portal**: The website needs to have an internal portal that should contain the following features: - Partner Management: Should have a signup and login functionality for partners. The portal should also have a feature enabling partners to track clients introduced by them. - Client Management: Requirement for a well-ordered system to monitor and manage our clientele. - Trading Room Interface: A feature for real-time trading must be incorporated. 2. **Dashboard**: A comprehensive dashboard through which we can view the metrics related to both clients and partners is necessary. 3. **Partner Earning Reports**: Pa...

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    Relativity UI & API Expert 6 hours left
    VERIFIED

    Please contact ONLY if you know this API I'm seeking a professional with a strong background in user interface design and API integration for the development of a Relativity system. Key Tasks: - User Interface Design: The ideal candidate should be able to create a moderate level of UI complexity. This includes providing customized UI elements and incorporating some dynamic content. - API Integration: Experienced in integrating APIs seamlessly into the system to ensure a smooth and efficient operation. Design Theme: - The project should reflect a corporate and professional design style. Ideal Skills & Experience: - Proven experience in UI design and API integration, preferably within the Relativity development environment. - Strong portfolio demonstrating previous work on pro...

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    I am looking for an experienced developer to build a robust API that will convert JSON data from our custom software into Xero. Key Functionalities: - Uploading bills: The API must have the capability to upload bills to Xero. This involves including the necessary data fields in the JSON, and ensuring they are correctly mapped in Xero. Specific Fields: - When uploading bills, it's crucial that the documents are included and handled correctly. Required Skills: - Strong experience in API development, particularly with Xero. - Proficiency in working with JSON data. - Attention to detail and ability to ensure accurate data mapping between different systems. - Prior experience with uploading documents through APIs is a plus. Please include any relevant experience you have working with ...

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    I am in need of an expert Flutter UI developer to craft a straightforward and intuitive interface for a Laundry Service application on iOS and Android. Your work will involve developing an easy-to-navigate UI which is already designed on figma, that encapsulates simplicity and enhances user productivity. – Required Skills and Experience: • Proven experience in developing UIs in Flutter. • Strong knowledge of iOS and Android development. • Solid understanding of intuitive and simplistic interface design. • Prior experience in the productivity app category beneficial but not mandatory. To submit an informed bid, please provide a brief of your Flutter UI development process and any relevant work in the productivity application sector.

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    Listing of New Companies profile which data taken from Ministry of Corporate Affairs MCA GST, PAN, and Other Govt Certificate search data directly taken from respective departments SCOPE OF WORK for Freelancer To enhance the visitors in website , consider the following scope of work: 1. Collection of API from Respective department: To reach our milestone our first job is collection data from various department like, • Ministry of Corporate Affairs [Register Companies data collection] • Goods and Service Tax [GST Register Companies data collection] • Income Tax [PAN Information Search] • Just Dial [All new business listing data collection] • Any other govt sites [all other available database collection] 2. Control Panel for Data Validation and edition or delecta...

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    Hello! I have integrated a Custom Post Type with a ACF. The idea of this ACF is that when I choose certain options, it will trigger an WpAllExport job, and once the job is finished it should send an email to the user that requested that file. This is happening in a Wordpress backend Admin, so we already know who the user is because it is logged-in. There are going to be 10 different options, and user can choose which wpallexport job to export. In the code the jobs need to be identified by job name, not by id. They will have unique names. For this task a Ihave a budget of 70usd. Don't bit with bots I will automatically drop your request.

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    I am looking for a skilled Python developer who specializes in VoIP and PJSIP development. The successful candidate would ideally have experience creating SIP trunking solutions focused on handling incoming and outgoing calls with a Python bot. Key Features: - Set up SIP trunking for call recording and monitoring, IVR system, and SIP trunking. - Convert my analog phone system to a VoIP system. - Implement Direct Inward Dialing(DID) support for calls between multiple company sites. - Configure the Python bot to manage incoming and outgoing calls. Bot Functionality: - Answer and route incoming calls to appropriate destinations. - Initiate outgoing calls based on specific triggers or events. - Handle real-time call transfers and call forwarding. Skills Required: - Proficient in VoIP and PJ...

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    I need a custom plugin designed to integrate with WooCommerce. This plugin must interface with three travel agency operators using an XML API. It should include a daily cron job set for a specific time to update travel packages, fully integrated with WooCommerce. This ensures that when a travel purchase is made, it verifies availability with the operator’s API before proceeding with the purchase. The plugin will manage travel packages from the backoffice but also needs to support a shortcode for frontend implementation, displaying a search and filters along with a listing. A similar plugin can be found at However, my requirement is slightly different, as it must utilize the operator’s XML API and confirm the package's availability with the operator before purchas...

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

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    Atualmente utilizo o ERP Sige Cloud e gostaria de migrar os dados para OMIE, existem 2 formas de migração, api ou excel. A melhor opção para mim seria por API pois vi que há uma forma de importar pedidos ja existentes

    $23 / hr (Avg Bid)
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