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 180,997 reviews, clients rate our API Developers 4.87 out of 5 stars.
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    43 jobs found, pricing in USD

    I am looking for a talented developer to help create an application that integrates healthcare APIs with both SMS Messaging platform and SMTP server. The goal is to enable - automated SMS reminders for appointments - automatically SMS or email survey requests to patients at the end of their consultations The main healthcare API we want to integrate is Optomate Touch - extensive technical documentation is provided and attached to their brief. We already have both an existing SMS Messaging platform (Sinch MessageMedia) and SMTP server so the developer won't need to build those from scratch. The job requires a deep understanding of healthcare APIs, SMS Messaging platform, and SMTP server. The developer will develop and code the application, create the necessary integrations require...

    $2623 (Avg Bid)
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    118 bids

    I am looking for a Zapier Expert who have experience with hubspot as well , we need 2 automation to be setup and want someone who is experience in these and can setup these with me on call , This is very Quick and Easy Job for expert and this needs to be done Right Now with them on call

    $14 (Avg Bid)
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    4 bids

    Custom WordPress E-commerce Website Completion Project Type: Hourly Budget: $10 per Hour AUD Project Duration: 2 Weeks & Ongoing --- Project Description: We are looking for an experienced and dedicated WordPress developer to help us complete a custom e-commerce website within a tight deadline. The majority of the work has already been done, and we need your expertise to finalise the remaining tasks to ensure the website can go live in just 2 weeks. Project Details: Website Type: E-commerce Deadline: 2 Weeks Existing Work: Most of the work is already completed. Future Enhancements: Further improvements and enhancements are planned after the initial release. Key Requirements: 1. WordPress Expertise: Proven experience in WordPress development and customisation. 2. E-commerce Experien...

    $7 / hr (Avg Bid)
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    142 bids

    I am looking for a skilled freelancer to help with the integration between our multi Fidelio PMSs, RADIUS server, and Internet Billing System. The primary goal of this integration is to enhance our customer experience. Currently, these systems are not integrated at all, and we are looking to streamline our operations by connecting them seamlessly. Skills and Experience: - Strong knowledge and experience in integrating multiple systems - Expertise in working with Fidelio PMSs, RADIUS server, and Internet Billing System - Familiarity with streamlining operations and enhancing customer experience - Flexibility and adaptability to meet our specific integration requirements, while also providing suggestions for improvements - Attention to detail and ability to troubleshoot any issues that may...

    $783 (Avg Bid)
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    27 bids

    Blockchain Development Project (2+ Year long project) I am looking for a skilled blockchain developer to assist with the development of a crypto exchange project using Ethereum or similar suitable blockchain. The main purpose of this project is to allow safe transactions and exchanges cross-chain and always show the latest rates. Skills and experience required: - Proficiency in blockchain technology - Strong understanding of smart contracts - Experience in blockchain APIs - Experience in back-end development - Long term work is required (2+ years) Please note that assistance with front-end development is not required for this project. The focus will solely be on the back-end development.

    $20 / hr (Avg Bid)
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    37 bids
    looking for a zapier expert 6 days left
    VERIFIED

    I am looking for a Zapier Expert who have experience with hubspot as well , we need 2 automation to be setup and want someone who is experience in these and can setup these with me on call , This is very Quick and Easy Job for expert and this needs to be done Right Now with them on call

    $27 (Avg Bid)
    $27 Avg Bid
    6 bids

    I am in need of an IICS application integration and B2B gateway specialist for my project. I require specific integrations with Salesforce, Shopify, and QuickBooks. The main requirement for the B2B gateway is API integration. The timeline for this project is 3-4 weeks. Skills and Experience: - Experience with IICS application integration - Proficiency in integrating with Salesforce, Shopify, and QuickBooks - Strong knowledge of API integration for B2B gateway - Ability to work within a 3-4 week timeline

    $22 / hr (Avg Bid)
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    10 bids

    I am working on a voiceflow chatbot for which is have used the stackai and zapier .I need assistance in migrating that workflow from stackai to flowise and from zapier to n8n.

    $480 (Avg Bid)
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    1 bids

    I need a mobile APP made with react native that will be sending a message by the user to an existing api and will return a modified text. The api is ready. The user should be able to login via facebook and google. The admin user should be have a web based dashboard in order just to enable or disable some users. The complete UI will be given on Figma and detailed documentation. The db should be Azure SQL Database or Cosmos DB The Authentication method can be Use Azure Active Directory B2C (Azure AD B2C) or other method If you can only implement that using mongodb or firebase also please place an offer

    $440 (Avg Bid)
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    98 bids

    I am working on a voiceflow chatbot for which is have used the stackai and zapier .I need assistance in migrating that workflow from stackai to flowise and from zapier to n8n.

    $70 (Avg Bid)
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    2 bids

    As a business looking to improve the performance of my application, I am now seeking to integrate the Pushr CDN for laravel. While I am not currently using a CDN, I am expecting less than 10k users on my application, with no definitive region or countries from which the majority of the users originate. As a result, I am looking for someone to assist in integrating Pushr CDN with my laravel application for improved performance. and to upload the images and videos from the application to the CDN.

    $162 (Avg Bid)
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    65 bids

    Medial Journal Research Project 1. The system should allow a researchers to register and then to let them to select their interested topics ex: • Cancer research papers. • Covid-19. • Heart dieses. • Pharmacology • Toxicology • Insulin resistance. • AIDS/HIV • Mental diseases • Latest innovations in medical instruments and so on…… 2. The system admin has the ability to register users on behalf of them via their emails like (VIP users and Ministers). 3. The system and using the given API should crawl local (in Oman) and online papers and reports available in different resources like : • Google directories (International research). • GCC research centers and research resources (International research) • Any other...

    $546 (Avg Bid)
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    40 bids

    I have subscription with fast account and also woocomerce website, and i want accounting software will be sync my all order and customer detail via API. accounting software share the api keys with us. and provide developer section. link is below

    $43 (Avg Bid)
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    8 bids
    Web3 Auth & Messenger 4 days left
    VERIFIED

    Looking for blockchain expert who can create a messenger with web3 auth and blockchain messaging.

    $16 (Avg Bid)
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    10 bids

    Hello, I will try to be as specific as possible so that you do not ask me the same thing that I already mentioned here, I am looking for a programmer with experience in API, I have an online store in Woocomerce which I want to connect to an external API of my recharge provider, I have created custom fields where you select country, provider, mobile number and amount, said data must be sent to my recharge provider so that he can automatically recharge, Do not worry about the payment method, since it will be using the balance of the Woocomerce wallet, so the order will always be made as completed. In summary, it is to send the data that the client has selected to my provider's API and it will then carry out the recharge and deduct the balance from my provider's panel. I am looki...

    $43 (Avg Bid)
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    25 bids

    The project can be finished by delivering 2 desktop app for 2 functionalities or if its easier 1 app for each of the functionalities. Attachment has all the details needed. - The app should be able to handle HTTP and also selection of an USB Security token and POST requests for seamless communication. - The desktop app needs to be completed within 1 week. - Ideal skills and experience for this job include expertise in desktop app development for Windows, proficiency in communication protocols, and experience in handling HTTP and POST requests.

    $158 (Avg Bid)
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    14 bids

    PaidMembershipsPro/Gravity Forms/Stripe Integration Project We are looking for a skilled developer to integrate PaidMembershipsPro, Gravity Forms, and Stripe. Functionality to integrate includes: Seat and Sponsored memberships configured in PMP for access to different forms to submit There is a cost per form submission - i.e. - $50/mo + $2 per submission Gravity Forms has the Stripe and Webhook Plugins installed Need to be able to charge a member the seat fee plus total of submissions for the previous month and have everything tracked/synced. The integration needs to be completed within two weeks. Would also like to possibly explore using Chargebee for seat and usage management. Ideal Skills and Experience: - Proficiency in PaidMembershipsPro, Gravity Forms, Stripe, and Chargebe...

    $538 (Avg Bid)
    NDA
    $538 Avg Bid
    20 bids
    mern``needed`` 4 days left
    VERIFIED

    BUDGET > $120 / DEADLINE > 5-7 DAYS IF YOU DO NOT AGREE WITH MY BUDGET & DEADLINE, PLEASE DO NOT BID. AND FOR LANGUAGE BARRIER, PLEASE DO NOT BID IF YOU'RE FROM ANY SOVIET/BALKAN COUNTRY!!! Hi there, I need a MERN developer, who can build a business phone app using the VoxImplant [] Platform APIs & SDKs. The app will have a simple dashboard, where each app user, who is a site owner, can: 1- create an account ~ we will use NextAuth; 2- subscribe to a monthly payment plan ~ we will use Stripe ~ 85% COMPLETED; 3- buy a mobile number ~ we will use VoxImplant Platform APIs & SDKs; 4- configure the number to receive/make calls & send/receive texts ~ we will use VoxImplant; 5- track number activities i.e. total calls, made calls, received calls, etc.; * I am looki...

    $115 (Avg Bid)
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    8 bids

    Hello, Here is website dbflaot what i want to do is that make something bot or program which fetch all newly data at once . its look like hard but easy i think its need to save some data . i will award since i will check that everything done in my pc

    $468 (Avg Bid)
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    25 bids
    ETL project using airbyte 3 days left
    VERIFIED

    Hi! I’m in need of a skilled freelancer who is reliable and effective. I want to create an interface that likely react because that goes fast and then I want to integrate Airbyte to let my customers be able to export data to big query. The initial project is for 2 sources (Facebook/Instagram organic) and 1 destination big query. This is a urgent project with short timeline reckon about 10-15h work. added a picture of process

    $159 (Avg Bid)
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    28 bids

    I am looking to convert a Telegram Crypto Trading Bot built with Python into a fully functional web application. To do this, I will be using and Typescript for the development of the web application. Additionally, I would like to add real-time market data updates as an additional feature so that users can easily view up-to-date information about various markets on the web application. The project scope also involves enhancing the existing trading strategies, as well as providing user authentication and account management.

    $18 - $150
    $18 - $150
    0 bids

    Need to fix this part or add a function. When I send one user's data the API works { "EMAIL": "", "FIRST_NAME": "Subscriber1 Fname", "LAST_NAME": "Subscriber1 Lname" } [ { "EMAIL": "", "FIRST_NAME": "Subscriber1 Fname", "LAST_NAME": "Subscriber1 Lname" }, { "EMAIL": "", "FIRST_NAME": "Subscriber2 Fname", "LAST_NAME": "Subscriber2 Lname" } ] But when I send several I get a response 403 { "EMAIL": [ "The Email is required" ] }

    $22 (Avg Bid)
    $22 Avg Bid
    19 bids
    mern``needed 2 days left
    VERIFIED

    NO PLACEHOLDER BIDS! NO PLACEHOLDER BIDS!! NO PLACEHOLDER BIDS!!! AND FOR LANGUAGE BARRIER, PLEASE DO NOT BID IF YOU'RE FROM ANY SOVIET/BALKAN COUNTRY!!! Hi there, I need a MERN developer, who can build a business phone app using the VoxImplant [] Platform APIs & SDKs. The app will have a simple dashboard, where each app user, who is a site owner, can: 1- create an account ~ we will use NextAuth; 2- subscribe to a monthly payment plan ~ we will use Stripe ~ 85% COMPLETED; 3- buy a mobile number ~ we will use VoxImplant Platform APIs & SDKs; 4- configure the number to receive/make calls & send/receive texts ~ we will use VoxImplant; 5- track number activities i.e. total calls, made calls, received calls, etc.; * I am looking for a full-time freelancer, who can complete ...

    $181 (Avg Bid)
    $181 Avg Bid
    13 bids

    I am looking for a skilled developer who can create an APEX application for me. The main goal of this project is to accept CSV files as input and store the data in tables in an Oracle Database. Requirements: - Develop an APEX application that can handle CSV files as input - Use procedures to convert the data from the tables into the desired format - Create an API integration that allows users to upload data for time entry Ideal Skills and Experience: - Strong knowledge and experience with APEX development - Proficiency in working with Oracle Databases and SQL - Familiarity with CSV file handling and data conversion - Experience in creating API integrations Please note that the expected timeframe for completing the project and the desired format for the data conversion were not provided...

    $56 (Avg Bid)
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    7 bids
    WB Data MVC 2 days left
    VERIFIED

    Already awarded to someone else. Thanks

    $3 / hr (Avg Bid)
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    4 bids

    I'm looking for a Senior WP Plugins + watchnet API Engineer. I have a WordPress site. This site sells subscriptions to a shooting range. Watchnet is used as a security system at the shooting range. The purpose of this project is to develop a plugin that takes data from the watchnet database and combines it with the wordpress database. I will wait for your bid.

    $174 (Avg Bid)
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    35 bids

    I am looking for a Mirakl Marketplace expert and someone who has had experience also with Omnivore Australia marketplace API software who can assist me with optimizing my Shopify website to external marketplace on an as-needed basis. The main goal of the optimization is to enhance product listings, and I require assistance with this task whenever it is necessary. My Shopify site only has approx 100-120 products. Skills and Experience: - Must have expertise in Mirakl Marketplace. I am based in Australia - and this sync is linked to Bunnings . Omnivore is a software I may have to use soon to connect to Kogan and Catch. I currently use Catchfeeder marketplace software which flows product to Catch. Omnivore API helps is here: Mirakl help support shows the product updating instructions et...

    $9 / hr (Avg Bid)
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    25 bids

    Powerful scraping Python API for Linux - I am looking for a Python developer to create a powerful scraping API specifically for Linux. - The API should be able to scrape data from specific websites that I will provide. - I only need the data to be scraped and no further processing is required. - The scraped data should be stored in a database of my choice. - The ideal candidate should have strong experience in Python programming, particularly in web scraping. - Knowledge of Linux systems and database management is also required.

    $178 (Avg Bid)
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    42 bids
    Python developer 2 days left

    Hello, and thank you for taking the time to consider my project! I am looking for an intermediate Python Developer to complete some work that I have in the pipeline. The specific Python skills required for this project are API integration, and no specific framework or library is needed.

    $11 / hr (Avg Bid)
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    31 bids
    NetSuite technical resource 2 days left
    VERIFIED

    I am looking for a NetSuite technical resource with advanced SuiteScript development experience. The main focus of this project is NetSuite customization. Skills and Experience: - Advanced SuiteScript development skills - Strong knowledge of NetSuite administration - Experience in NetSuite customization - Workflows and Customisations - WMS and Scanning - pick, pack and ship - EDI and API's Timeline: - The work needs to be completed as soon as possible.

    $16 - $32 / hr
    Local Featured Urgent Sealed NDA
    $16 - $32 / hr
    11 bids

    I'm going to build a mobile application that allows my customers to exchange their betting currencies(1XBET, LINEBET, BETWINNER, PERFECT MONEY) from or to local or fiat currencies using my application with the help of MobCash API. So what am looking for is a MobCash API that allows me to send money from my account to a user using the API.

    $494 (Avg Bid)
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    34 bids

    I'm looking to create code in Google AppsScript that uses OAuth to interact with the API for our door locks. At this stage, all I want it to do is use a list of user identifiers in Google Sheets to update those users' access codes and then export the new codes to the same Google Sheets file. The API documentation is here:

    $222 (Avg Bid)
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    I am looking for a developer with experience working with APIs to connect our vacation rental system (which is made in Laravel) to using the API. The ideal candidate will have the following skills and experience: - Experience working with APIs, specifically the API. - Ability to complete the integration within a 3-4 week timeline. - Knowledge and understanding of integrating availability and rates, content, photo and get reservation functionality. If you meet these requirements and have the necessary skills and experience, please submit your proposal.

    $1249 (Avg Bid)
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    116 bids
    Chatgpt API integration 1 day left
    VERIFIED

    Need someone experience developer to integrate ChatGPT/OpenAI API and also to integrate Twitter API. Details are straights forward. and I will share details to the persons who worked on openAI API

    $327 (Avg Bid)
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    24 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...

    $384 (Avg Bid)
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    6 bids

    I am looking for a skilled Flutter developer to create a social wishlist site. The site should allow users to create wishlists and share them with others. Users should also be able to follow other users' wishlists. Design/Scope of project/Functionality that must be supported: Timeline: The project should be completed within 1-2 months. Please use the sigma file to estimate effort/pricing. The SRS document might contain fewer features than shown in the FIGMA file. Ideal skills and experience: - Experience with Flutter development - Proficiency in creating social networking sites, API integrations, and payment platforms. - Strong communication skills to ensure timely completion of the project

    $2303 (Avg Bid)
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    192 bids

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

    $470 (Avg Bid)
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    29 bids

    Tengo una tienda en woocomerce y he creado un producto con campos personalizados en los cuales puedes selecionar. - Pais - Operador - Monto/precio - Numero movil. Tengo un provedor de recarga y quiero que dichos datos se le envie a el provedor para que el ponga la recarga automaticamente. El trabajo seria conectar la api con woocomerce para que el producto al completarse envie los parametro a la api y se ponga la recarga movil automaticamente. El proveedor es: Persona que hablen español ya que el sitio y la api estan en espàñol.

    $49 (Avg Bid)
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    10 bids

    ****PS: ONLY FOR BRAZILIANS******SOMENTE BRASILEIROS ******* Olá. O desenvolvedor deverá saber instalar a versão mais recente do open cart 4 (última versão) 100% em português (brasil) em 2 ambientes: dev e produção na minha atual hospedagem. Efetuar a integração com o Tiny ERP e já baixar para a loja os produtos que estão lá cadastrados. Regras: 1. Aloja já deverá vir com integração com a KANGU para o cálculo dos fretes. 2. Integrar com apenas meio de pagamento: STRIPE (já tenho conta lá).

    $203 (Avg Bid)
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    Hola, Busco quien pueda integrar etpay en mi codigo laravel de eventmie esta realizado en laravel 8. link de api:

    $45 (Avg Bid)
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    8 bids

    El sistema funciona a través de un webhook a una Api no oficial de whatsapp. El trabajo consiste en adaptarlo para que funcione con la Api OFICIAL. Si necesitan más información, pueden consultar.

    $161 (Avg Bid)
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    16 bids

    Нужен бот для сайта который будет мгновенно покупать заданные мной вещи. Обьяснение что и как. На сайт в 10:00, 11:00 и тд (каждый час дня с 00:00 до 24:00) поступают новые предметы с ботов, у каждого вида предмета есть своя страница, нужно моментально сканировать наличие вещей в 10:00, 11:00 и тд и моментально покупать их, т.е. эти действия должны производиться в течении нескольких секунд после того как предметы поступили на сайт. Важная часть это время покупки, т.к. буквально за секунд 5-10 предметы скупают другие пользователи. Так же нужна функция чтобы я самостоятельно мог добавлять и удалять тот или иной предмет из списков бота. Все остальное в лс

    $213 (Avg Bid)
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    3 bids

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