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 186,908 reviews, clients rate our API Developers 4.86 out of 5 stars.
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    38 jobs found, pricing in NZD

    I'm in need of an experienced developer who can confidently implement Fedapay payment on my website. The site has been built on CodeIgniter. Key Requirements: - Perform comprehensive API integration, not just basic payment processing or recurring bill payments. - Clearly display extensive experience in similar projects. Application Requirements: - Showcase your experience with API integration projects, especially ones involving payment systems. Only experience-demonstrating applications will be considered. This project requires a deep understanding of Fedapay API integration. Let's discuss details further upon your application!

    $311 (Avg Bid)
    NDA
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    I'm looking for someone to create an API connection between Tradify and Hubstaff for an existing business running on Windows. Our end goal is to automate the creation of geofence locations in Hubstaff whenever a job gets created in Tradify, essentially populating Hubstaff with the same jobs as Tradify. Key Project Requirements: - Transfer of job details and customer information from Tradify to Hubstaff. - A good understanding of Tradify and Hubstaff and their API integrations. - Experience in creating API connections and automations. Ideal Skills and Experience: - Proven track record in API integration - Experience with Tradify and Hubstaff platforms - Expertise in Windows OS - Exceptional problem-solving skills

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    I am looking for someone adept in Python and knowledgeable about cryptocurrency trading, specifically Bitcoin (BTC), to develop a custom trading bot for me. The bot will be interacting with the Kraken exchange. I also have started to build this project, but at the point to pass it along for some help. im not sure if its better to start from a brand new project or work with some of the code I have already. Here is a quick overview of the job: - Python development: You'll need to create a bot to automate Bitcoin trading. You must have some experience with Python and be able to work confidently in this language. - Cryptocurrency trading: The bot will be trading on the Kraken exchange. You should have experience with this exchange and a clear understanding of cryptocurrency trading. - ...

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    I need a developer who is proficient in Python and familiar with API integration to update my current automation script. I'm looking to add a user input functionality. Additionally, as an extension of this function, I'm interested in having textual data scraped as an output. Ideal Skills: - Strong Python programming skills - Experience with automation scripts - Familiarity with API integration - Knowledge of data scraping, particularly text data. Please note, specifics regarding the data to be scraped will be provided upon project initiation. Previous experience in similar projects will be highly regarded.

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    I need a developer who is proficient in Python and familiar with API integration to update my current automation script. I'm looking to add a user input functionality. Additionally, as an extension of this function, I'm interested in having textual data scraped as an output. Ideal Skills: - Strong Python programming skills - Experience with automation scripts - Familiarity with API integration - Knowledge of data scraping, particularly text data. Please note, specifics regarding the data to be scraped will be provided upon project initiation. Previous experience in similar projects will be highly regarded.

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    I need a developer who is proficient in Python and familiar with API integration to update my current automation script. I'm looking to add a user input functionality. Additionally, as an extension of this function, I'm interested in having textual data scraped as an output. Ideal Skills: - Strong Python programming skills - Experience with automation scripts - Familiarity with API integration - Knowledge of data scraping, particularly text data. Please note, specifics regarding the data to be scraped will be provided upon project initiation. Previous experience in similar projects will be highly regarded.

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    Jr. Python developer 6 days left
    VERIFIED

    I'm looking for Jr. Python developer to create a few functions that get all get a specific email send email based on this API:

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    I'm seeking a developer to assist me with custom algo gathered data feeding to tradingview advance charts. There will 4 datas, buy/sell pressure, momentum and average weighted price. Key requirements: - Displaying stock prices: The primary focus of the project is to display stock prices in real-time. - Real-time updates: It's crucial that the chart updates dynamically to reflect the latest stock prices. I have algo compiled data that I want to see on tradingview charts m 4 data primarily very important , buying pressure, selling pressure, momentum and average weighted price gathered by the algo. Data is pushed from windows server running in colo to an api and then programmer will get the api including the data in it and put it on tradingview charts. It would be gre...

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    I'm in need of a developer to create a paid online store for me. The store would be used to sell digital products. I want to link APIs to the store in order to facilitate certain functionalities: - Product Catalog: The store needs to have a clear, user-friendly product catalog where visitors can browse and view the items available for sale. - Shopping Cart: I'm looking for a basic shopping cart system that allows users to add products to their cart and proceed to checkout. - Payment Gateway: The store must integrate with a reliable payment gateway to process transactions securely and promptly. Digital Product Delivery I envision a straightforward process for handling digital product delivery. After a successful payment has been made, the digital product should be automatically a...

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    Please read completely before placing a bid ! Please bid only if you also plan to respond... Please someone who is interested in doing several projects Please make realistic offers and no fake offers where the price multiplies afterwards. Please keep in mind that changes can still be made during the testing phase ! Hello, I am looking for a programmer for regular collaboration, who can write an upload/download tool for usenet in the first step. Thank you! My Requirements are: -Combine the settings of the programs mentioned (ngPost, Nyuu, NewsUP, SabNZBd) -download functions like the program "sabNZBd" -for Windows (With a proper installation routine and as an .exe file!!) -Python -NNTP (Network News Transfer Protocol) -modern GUI and a nice logo :) -source code, commenting o...

    $255 (Avg Bid)
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    Please read completely before placing a bid ! Please bid only if you also plan to respond... Please someone who is interested in doing several projects Please make realistic offers and no fake offers where the price multiplies afterwards. Please keep in mind that changes can still be made during the testing phase ! I am looking for a talented web developer to launch a Usenet search engine website. This is a unique opportunity for someone with hands-on experience in building secure, efficient and user-friendly search platforms. Here's a snapshot of what's on my wish list: Skills and experience: - Knowledge of HTML (as stated, but ideally also Python, JavaScript or PHP). - In-depth knowledge of NNTP (Network News Transfer Protocol) - Good track record of creating well-documented,...

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    As an online publisher, I am seeking to integrate document editing and management functionality using NextJS(React) and Onlyoffice. To be a good match for this project, your skills should include: - High proficiency in NextJS(React) and Onlyoffice - Experience with document editing and management integrations - Deep understanding of manipulating 'Word' document formats Key aspects of the project include: - Configuring the document editing and management features of Onlyoffice within a NextJS platform - Ensuring the smooth handling and manipulation of 'Word' document formats within the system Finally, it's essential for the system to be easy to navigate. Users should be able to access documents seamlessly within this NextJS project. To apply, please provide ex...

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    I need a telecommunication website with API integrations. You need to understand the whole API workflow of the services going to be implemented aswell as making a modern futuristic dashboard design. Check out the requirements inside the document What i need: - free bug and security maintenance - modern futuristic design - understanding the whole API of sms-activate and plivo

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    I am seeking an experienced AWS developer to assist me in integrating the AWS API, setting up Amazon Cognito, and developing AWS Lambda Functions for my project. NEED TO COMPLETE WITHIN 2 DAYS. Project high level design attached. Key Tasks: - AWS API Integration: Integrate AWS API into our existing architecture. - Amazon Cognito: Set up Cognito and ensure smooth user registration, login, and access control. - AWS Lambda: Develop necessary Lambda functions for various operations related to the project. The suitable candidate should be proficient in JavaScript or Python or Java or Node.js, have in-depth knowledge of Amazon Web Services. Experience in setting up role-based user authentication and multi-factor authentication using Cognito will be a major plus. Your primary focus will ...

    $22 / hr (Avg Bid)
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    1. Virtual Printer driver API a. To be send to NFC Device and the same data to be transmitted to mobile. b. Virtual Printer Data to be send to the application hosted onto cloud and also to be send to Mobile ( Once User authenticate, the data is send to the mobile Device ) Objective Create virtual printer with a window custom printer settings. NFC device driver for accepting the data and transmitting to the mobile device 1 A) Task 1. It should be an installer that will create a printer in the panel Windows devices as if it were a conventional printer. 2. It must be valid Windows/MAC 3. When it is sent to print a document a. The document that will be stored in a pre-defined folder b. The folder will read the xml configuration file. ...

    $4050 (Avg Bid)
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    We use a Custom GPT Assistant Api, connected to our website, that provides quotes with our users. If a user wants a quote pdf, we want the GPT assistant to post the conversation data to a webhook in We need help connecting this assistant and a specific conversation to Once this data is in we can produce the pdf (no help required here).

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    Crypto Algo-Trading - Python 4 days left
    VERIFIED

    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.

    $27 / hr (Avg Bid)
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    Update an Existing Zapier App 3 days left
    VERIFIED

    I have a custom Zapier app using my API (JSON RPC, NodeJS). I want to add a new Action to it that uses Elevenlabs' Text-to-Speech API (Post). When calling Elevenlabs's API, currently the result is a binary file. The goal is to be able to use the file/s in my Zapier app, since the generated audio will be part of another content. However, in order to achieve this, we would need to find the best approach. For instance: Option 1: Change the way my app in Zapier currently works so that it accepts "File" AND "URL" for audio content. The current approach is URL, however, Elevenlabs' doesn't provide a URL for the generated audio, but a File. If we add the "File" option to my app in Zapier, we need to send the file to a specific media upload e...

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    I have an existing PHP script that handles text translation, and I need an exact replica of it in Google App Script. Ideal Skills and Experience: - Proficiency in both PHP and Google App Script - Experience with text translation APIs or libraries - Understanding of database operations in Google App Script Key Points: - The current PHP script specifically handles text translation from Gujarati to Hindi and Gujarati to Latin. You'll need to ensure that the same functionality is replicated in Google App Script. - The project is time sensitive, so I need it completed ASAP.

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    I currently use Hawksoft CMS and Marketing 360 CRM. My project requires a platform that integrates these systems with a document signer and a calculator. Key Features: - A user-friendly log in system with multiple users. - Integration of Hawksoft CMS and Marketing 360 CRM into the platform. - A document signer with the ability for electronic signatures and document tracking. - A calculator that includes formulas for interest and payment schedules. Ideal Skills: - Proficiency in CMS and CRM integration, particularly with Hawksoft CMS and Marketing 360 CRM. - Experience in developing document signing features with elements such as electronic signatures and document tracking. - Strong background in building calculators with advanced financial formulas, particularly those re...

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    I am searching for someone who can just show me how can I set the HTTP request from inside ManyChat flow builder, so I became able to make POST/GET from ManyChat to Dialogflow. The image attached to this offer shows exactly the module I need to configure.

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    I'm in need of a skillful API expert who can complete the creation of my app on Zapier. I've already managed the authorization part; now what's required is the trigger setup. I have comprehensive API guides at hand and simply need someone with the right expertise to get the trigger implemented. Key Tasks: - Creation of a trigger that will add a new client to a specific list - Implementation of the trigger in accordance with the API guides The trigger that needs to be created will involve gathering and adding the following information: - Name - Email - Phone number I'm seeking a professional with the following skills: - Strong experience in developing APIs - Proficiency in working with Zapier and creating triggers - Excellent attention to detail to ensure the trigger ...

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    multer node js task 2 days left
    VERIFIED

    i need to upload user image with user id (name) by using multer node js and also can be able to replace it work by anydesk or teamveiwer

    $7 / hr (Avg Bid)
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    I am in need of a competent developer to code my existing trading strategy tu run on Freqtrade. We will integrate the bot to Bybit. Key requirements: - Understanding of Freqtrade software - Prior experience in developing trading strategies - Knowledge of the Cryptocurrency market - Familiarity with the Bybit platform The ideal candidate will have a proven track record in developing strategies to run on Freqtrade and a comprehensive understanding of crypto trading.

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    Hello, I just need a quick solution to send Whatsapp message using twilio API. In my twilio account, I have already [Whatsapp Business Account ID], [Meta Business Manager ID], [WhatsApp number] That is it. Thank you for your time and look forward to working with you.

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    Need C# developer to integrate zatca and below actions, Please contact if you have previous experience in zatca einvoice integration. Prefer to develop a rest Api to call zatca and input parameter will provide invoice in Json. Anyone has previous experience on zatca integration is preferred, we need to complete as soon as possible. 1. Create CSR certificate 2. Compliance Invoice with simulation and production 3. Clear Invoice with simulation and production 4. Report Invoice with simulation and production Note: We need source code, and it should be configured on our system.

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    I'm looking for a skilled professional to help me install the eBay API on my existing Ubuntu 22.04 server for the primary purpose of showing orders on webpage. here is the sdk - Key Responsibilities: - Installation of the eBay API on the Ubuntu 22.04 server. - Ensuring the API is correctly set up to show orders on webpage. Ideal Skills and Experience: - Proficiency in working with Ubuntu servers, particularly version 22.04. - Prior experience installing and configuring the eBay API. - Ability to implement API functionalities for showing orders on webpage. If you have a good understanding of eBay's API and are experienced in working with Ubuntu servers, I'd be interested in hearing from you. Please share your relevant experience and explain how you would tackle this tas...

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    I've got around 50 image folders with less then 1000 files in jpg format, each with GPS metadata. I need an expert to convert this metadata into Google Earth points. Key requirements: - **Automatic Generation:** The points should be created by extracting metadata from the images, not manually added. - **Output Format:** I need the final points to be saved in KML format, for easy integration into Google Earth. - **Quality Assurance:** Accuracy is key, the points should correctly represent the image positions. They will be broken into 3 colours depending on the date they were taken, the data is in the folder name and file name. Ideal Skills: - **GPS Data Handling:** Understanding of how to extract and work with GPS metadata from images. - **Google Earth Proficiency:** Experie...

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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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    Desktop AI App for Mac 20 hours left
    VERIFIED

    I am seeking a proficient developer to build a a Mac desktop application, primarily assisting with generative AI by allowing users to call both proprietary LLMs like OpenAI, Claude , Gemini and open source self hosted LLMs using ollama, LMstudio. The expected functionalities should include: • Image Generation: The app should be capable of rendering unique creations from existing databases, or random generation with specifications. • Music Composition: The app should generate original music based on selected parameters, showing its understanding of various music theories. • Text Generation: The app should produce coherent and relevant texts depending on the context provided. The ideal candidate would have prior experience in building Mac desktop app, AI apps and a solid un...

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    We are in need of a proficient Flutter developer to enhance our mobile application. The focus of this project is to refine the functionality of the Trending Screen, specifically to display products currently available on Wishive, which are integrated with Woo-Commerce and modify the click behaviour for in-app web-view. API calls will be provided. Below is a detailed breakdown of the tasks involved: 1. **Modify Trending Screen:** - Remove the search bar object located under the Wishive Live Marketplace bar. - Delete categories (breadcrumb) displayed under the search bar. - Eliminate the "Add to Cart" button from the products taxonomy. - Modify the display of thumbnail product images to fetch from the CDN entry from API dataset instead of the internal media gallery. 2...

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    I want a python script that will check the balance of my four wallets inj1.... (injective blockchain), cosmos1.... (cosmos blockchain), osmo1.... (osmo blockchain) and juno1.... (juno blockchain) every 5 seconds. And in case the INJ balance increases, ATOM. OSMO or JUNO, then the entire balance will be transferred fully automatically to another wallet inj1...., cosmos1...., osmo1.... and juno1.....

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    Create a web application that combines information or functionalities from two or more web APIs in a useful and sensible way. This is called a Web Mashup. You are free to decide on the purpose of your application, and which Web APIs you use. However, the Web APIs you have selected need to work together to fulfil the purpose of your application. An example: An intelligent Flickr photo browser that displays photos related to user’s interest. This can be done by fetching user’s “like” from Facebook web API, and then use this information to retrieve Flickr photos (using Flickr search) related to user’s like. (Note: A good implementation of this application would be at a pass level) In a more sophisticated implementation, an analysis of user’s Facebook posts ...

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

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    ¡Hola! Estamos buscando un desarrollador experto para crear una API personalizada que nos permita integrar la aplicación de Loyverse con el Ministerio de Hacienda de El Salvador para la facturación electrónica. La API debe cumplir con los estándares establecidos por el Ministerio de Hacienda y garantizar una comunicación eficiente entre Loyverse y los servidores del Ministerio. *Requisitos del Proyecto:* 1.⁠ ⁠Desarrollo de API: Creación de una API que genere y envíe facturas electrónicas al Ministerio de Hacienda de El Salvador. 2.⁠ ⁠Integración con Loyverse: Sincronización de datos de productos, clientes y transacciones entre Loyverse y la API de facturación electrónica. 3.⁠ ⁠Pruebas y Depuraci&oa...

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    Experto en Api´s 3 days left
    VERIFIED

    Se necesita experto en apis para que forme parte del equipo y poder desarrollar apis y trabajar con las que tenemos actualmente.

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    I need an experienced WordPress developer to create a custom plugin for my site. This plugin will communicate with the Transmission shipping company's REST API. Key Requirements: - 2 buttons are needed in backend wp. 1: ADR shipment (dangerous goods) 2: normal package - After generating the shipping label the custumor should receive the trackingcode. - After generating label is must be printed automatically on a zebra printer. - The plugin must be able to communicate with the Transmission shipping company's REST API. - Data exchange should be smooth and secure. - The plugin should be well-organized within WordPress, and easy to understand and use. Ideal Skills: - Strong experience with WordPress plugin development. - Good understanding of custom API integration. - ...

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    Türk varolan bir web panelin düzeltilmesini veya yeniden yazılmasını istiyoruz. Tüm detaylar belli

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