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 184,412 reviews, clients rate our API Developers 4.86 out of 5 stars.
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    38 jobs found, pricing in USD

    I'm looking for an experienced developer to build a Forex trading platform with a simulation feature to facilitate practice trading. Key Functionalities: - Real-time data streaming: The platform should be able to provide live market data to users. - Practice accounts for users: Users should be able to create practice accounts to simulate trading without real money. - Integration with external APIs: The platform should be able to integrate with external APIs to retrieve additional data and features. Practice Account Features: - Simulated trading with virtual currency: Users should be able to trade with virtual currency, simulating real-life situations without any financial risks. - Real-time market data for accurate practice: The platform should provide users with real-time market da...

    $1140 (Avg Bid)
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    26 bids

    I need a skilled PHP developer to help me resolve an issue with the NOWPayments API. The problem is that the API is correctly receiving crypto from the gateway, however, it's not crediting the user accounts in my application after the deposit has been confirmed. **Key Tasks:** - Investigate why the API isn't crediting user accounts and fix the issue. **Your Responsibilities:** - You will be required to directly modify the existing code to resolve this issue. **Requirements:** - Proficient in PHP, and have experience working with external APIs. - Strong ability to troubleshoot and solve coding issues. - Experience working with cryptocurrency APIs will be an added advantage. I am open to suggestions on how we can best solve this problem and am looking for a developer who ca...

    $39 (Avg Bid)
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    2 bids

    Project Overview: We are looking for an experienced freelancer with knowledge or experience in the chinese shopping market industry with familiarity or knowledge about with shopping agents (superbut, pandabuy, Cssbuy etc), chinese marketplaces (taobao, weidian, 1688 etc), ecommerce/multivendor marketplaces, apis and documentation to create an information architecture (IA) diagram for our multivendor marketplace website. This website will streamline the purchasing process for global customers buying from Chinese sellers by integrating various functionalities from chinese shopping agents by APIs and inviting sellers to our platform. Key Features to Include (these arent the only things we want so we are relying on your experience and creativity to add more features and functionalities beside...

    $190 (Avg Bid)
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    20 bids
    Develop a Lead Generation Bot 6 days left
    VERIFIED

    I am seeking a talented, experienced developer to build an AI-powered lead generation bot. This bot will be designed to automate phone calls and interact with potential leads to qualify them and schedule follow-ups. The ideal candidate will have a strong background in AI and machine learning, experience with , and a proven track record of developing successful lead-generation tools. Design and develop an AI-driven lead generation bot using Bland.ai. Integrate the bot with our GHL CRM and marketing platforms. Create intelligent call scripts and workflows to qualify leads and schedule follow-ups. Test and optimize the bot for maximum efficiency and lead conversion rates. Provide documentation and training for our team on using and maintaining the bot.

    $519 (Avg Bid)
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    64 bids

    I want to add a limited amount of search results of vacations rentals from an API () to an existing Drupal 7 view. The existing view has an exposed filter (search box) and the search terms appear in the URL. So for example: The API results must be included inside the view (on top of my own Drupal results). The idea is to load the API results based on the filters given by the URL. So for example "available from date" of Drupal is the "arrival date" of the API. And amentityfilter "tid 12" of Drupal is "TERRACE" of the API. And so on for other amentities, amount of days and amount of persons. In the end, the search results should look more or less like the attached screenshot (including a picture and information about the price, the amount of days, ...

    $166 (Avg Bid)
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    35 bids

    We need a developer, not an accountant!!! and ONLY WITH EXPERIENCE WITH QUICKBOOKS ONLINE I need an expert in C# to integrate our Point of Sale/Enterprise Resource Planning (POS/ERP) system named "CIZARO" with QuickBooks Online. The goal is the seamless syncing of different modules, We already have a similar code we made integration with SAP Business One for example how to do integration, We have coded someone to start integrating directly with QuickBooks Online. we can share this code to have the fastest development, and we also have the code of a previous developer who made Quickbooks Online but it half done. This Milestones we will have Milestone 1: will be for 120 USD for Sync Products, categories, variants, discounts, pricelist dual CIZARO to QuickBooks Online and Quick...

    $512 (Avg Bid)
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    23 bids

    Project Title: Automated Copy Trading System for Quotex with Telegram Signal Integration Description: I am looking for a skilled freelancer to develop an automated copy trading system for Quotex with integration to Telegram signals. The system should be able to execute trades online and utilize martingale up to 3 steps. Preferred Trading Platform: - Quotex Level of Automation: - Full automation is required, eliminating the need for manual input. Risk Tolerance Level: - The system should be designed to accommodate moderate risk tolerance. Skills and Experience: - Strong knowledge and experience in developing automated trading systems. - Proficiency in Quotex trading platform. - Familiarity with Telegram signal integration. - Understanding of martingale trading strategy. - Ability to im...

    $112 (Avg Bid)
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    4 bids

    Project Title: Automated Copy Trading System for Quotex with Telegram Signal Integration Description: I am looking for a skilled freelancer to develop an automated copy trading system for Quotex with integration to Telegram signals. The system should be able to execute trades online and utilize martingale up to 3 steps. Preferred Trading Platform: - Quotex Level of Automation: - Full automation is required, eliminating the need for manual input. Risk Tolerance Level: - The system should be designed to accommodate moderate risk tolerance. Skills and Experience: - Strong knowledge and experience in developing automated trading systems. - Proficiency in Quotex trading platform. - Familiarity with Telegram signal integration. - Understanding of martingale trading strateg...

    $102 (Avg Bid)
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    3 bids

    WHAT YOU BID IS WHAT YOU BID. Site needs to be cleaned up, and redesigned for easier use. Mobile version must be built. New products will be added, one is a standalone site that it redirects too. New reporting functionality must be added to the current site, including daily sales exported to upload to quickbooks. Functionality must be added to see individual customers orders, set/reset customer passwords / delete customer accounts / set custom pricing for individual customer accounts. Shipping support must be cleaned up, and a new API shipper added. current site for viewing is I'm looking for a talented web developer to help revamp my current website. The main tasks involve restructuring the layout to enhance navigation, improving mobile responsiveness, and giving it a stylistic ...

    $348 (Avg Bid)
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    124 bids

    I need a custom dashboard built using Softr, to manage our business automation services. The dashboard should allow users to access and let them request, activate/deactivate, and track their automations. Key Features: - User Access Management: Users should be able to log in, view, and manage their automations. - Automation Request Form: A form should be available for users to request new automations. - Activation/Deactivation Functionality: An option to switch on or off the automations. - Billing Information: The dashboard should display relevant billing details of the automations. - Slack Integration: When automations are requested, this information should be posted to Slack for the team to pick up. Integrations: - Airtable: The dashboard should smoothly integrate with Airtable to ensur...

    $486 (Avg Bid)
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    22 bids

    I'm looking for an experienced developer to create a web-based voicemail drop app. This tool will be crucial for my business as it will allow me to send voicemail messages in bulk to multiple contacts. i prefer to work with someone that has already built similar application, so we can just replicate the same thing and add few customisation.

    $22 / hr (Avg Bid)
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    58 bids
    Realizar modulo para odoo 4 days left
    VERIFIED

    I need create an odoo module to send and receive message in whatsapp using wazzup API.

    $205 (Avg Bid)
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    29 bids

    POS App Points Required: I want one single page dashboard - Swiggy & Zomato API integration

    $128 (Avg Bid)
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    25 bids

    I have made a design for my app idea and I need a developer who can make the db and workflows in the app. This project needs to be done very fast. AND ONLY IN BUBBLE. Don't bid if you're not a developer!!!

    $11 / hr (Avg Bid)
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    20 bids

    I'm searching for an experienced AI/ML developer with comprehensive expertise in integrating external services, fine-tuning base models, and embedding graphics in the context of RAG approach. Key Responsibilities: - Utilizing comprehensive knowledge in AI/ML to consume external services and integrate them efficiently into the model. - Fine-tuning the base AI model to significantly enhance its accuracy. - Implementing the RAG approach by embedding graphics to facilitate a visual representation of the model's insights. Ideal Candidate: - Proficient in AI/ML techniques and methodologies, with a proven track record in model fine-tuning. - Experienced in consuming external services and implementing third-party integrations into AI models. - Familiar with the RAG approach and capable...

    $37 / hr (Avg Bid)
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    75 bids

    KINDLY INCLUDE LINK OF YOUR OWN WORK PLEASE. I need a skilled backend developer to work on a project of medium scale. The ideal candidate should be able to efficiently handle user authentication, database integration and API development and develop sleek admin backend. Key Responsibilities: - Implementing user authentication: the developer should be capable of establishing secure and efficient authentication protocols. - Database integration: the ability to seamlessly integrate and manage data within the project. - API development: creating well-documented and robust APIs is essential. Requirements: - Prior experience with medium-sized projects: The ideal candidate should be comfortable working on projects with moderate complexities. - Strong understanding of user authentication, datab...

    $671 (Avg Bid)
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    151 bids

    I'm in urgent need of a seasoned developer to support me in configuring an API for my ATS/CRM system, Ceipal. Here are the key aspects of the project: - **Integration with existing systems**: I require seamless integration between Ceipal and other systems within my business. Your expertise in this area will be pivotal in ensuring fluid data flow and system operation. - **Data extraction and synchronization**: Your responsibility will extend to setting up a reliable data extraction mechanism and ensuring that it's synchronized efficiently with Ceipal. This is crucial for the ongoing operational success of our systems. - **API customization**: I'm looking for a professional who can customize the API functionalities as per my business needs. Your ability to unders...

    $20 (Avg Bid)
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    10 bids

    The challenge is to develop a template that can integrate data from different API using script component and C#, from MS Integration Services (SSIS) The task involves: First Part: ($7) - Setting up correctly the SSIS environment for fluent integration with different API - Develop a template to read/write integration with APIS with no token - Develop a template to read/write integration with APIS with credentials Second Part ($7) - Nice to have any SAP hana account to develop the same job. - Develop a template to read/write integration with SAP APIS with credentials Ideal candidates for short task should have: - Experience with SSIS and C# - Proficiency in working with APIs - An account for a test db of SAP Hana Note, this is not a large project, this is only about develop a templa...

    $25 (Avg Bid)
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    14 bids

    I'm looking for a skilled professional who can integrate data from GoHighLevel and Encompass360 into Microsoft PowerBI. - Connect GoHighLevel and Encompass360: I need both of these data sources to be connected to our PowerBI for in-depth analysis. - Visualizing Sales Performance and Marketing Campaigns: I specifically want to focus on Sales Performance and Marketing Campaigns data from GoHighLevel. I need you to set up these visualizations in a way which is intuitive and easy to understand. I have identified the following KPIs to be tracked and displayed in PowerBI: - Revenue - Conversion Rate - Return on Investment (ROI) Ideally, the project requires: - Profound experience in setting up data connections and visualizations in PowerBI - Familiarity with GoHighLevel ...

    $1159 (Avg Bid)
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    63 bids

    Job Title: Experienced Developer Needed for API Integration of Property Channel Manager into WordPress Short-Term Rental Website Job Description: I am seeking a skilled and experienced developer to assist with integrating a booking engine from a 3rd party API Property Channel Manager/Property Management System (PMS) seamlessly into my WordPress-based short-term rental website. The integration needs to include customization to ensure it aligns perfectly with the existing design and functionality of the site. Responsibilities: - Integrate the 3rd party API from the Property Channel Manager/PMS into the WordPress website. - Customize the booking engine to fit with the current design and user experience of the website. - Ensure the integration is seamless, with no disruption to t...

    $316 - $949
    Featured Sealed
    $316 - $949
    142 bids

    I am looking for an experienced developer who have proven knowledge of working with WebEngage platform for custom Integrations. We offer APIs for sending SMS. We would like to integrate with WebEngage for sending SMSs through our platform. - Some of our customers uses WebEngage for marketing automation - We offer APIs for sending individual SMS - We would like to integrate our product (APIs) so if a customer of ours has an active account with us as well as WebEngage, they can use our APIs to send/ trigger SMS (for bulk sms as well as transactional) through their WebEngage CRM/ Marketing campaigns. We can make changes to our APIs if need be, however we would like a complete Integration Solution with WebEngage. Currently we offer SMS services only for Indian Mobile numbers. More det...

    $30 - $250
    Sealed
    $30 - $250
    16 bids

    I have an existing Flutter app that requires the integration of a crypto payment gateway. I've made the decision to use NowPayments specifically for this project. Requirements: - Integration of NowPayments: You need to be well-versed in integrating the NowPayments API into a Flutter app. - Cryptocurrency Support: The app payment should be able to accept both USDT and BTC. Kindly note that I've already set up an account with NowPayments, and there's a working Flutterwave payment API already on my app.

    $206 (Avg Bid)
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    63 bids
    Laravel VTU API Vendor Switch 15 hours left
    VERIFIED

    I need my API vendor on my Laravel website changed from to as soon as possible. The project involves switching the current VTU API vendor on my Laravel website to a different one. This needs to be done promptly, so I'm looking for a highly skilled Laravel developer with experience in API integrations. Key requirements: - Expertise in Laravel framework. - Proven experience with API integration. - Ability to execute the switch within a tight timeframe. Your task will be to seamlessly replace the existing API with the new one, ensuring all functionalities are maintained and that the new API is fully operational. Experience with VTU APIs will be a plus. Before you bid, please ensure you are well-versed in Laravel and API integrations. Your ability to deliver the project quickly ...

    $40 (Avg Bid)
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    Python Quote Bot Development 13 hours left
    VERIFIED

    I'm in need of a Python developer to create a sophisticated quote bot for my website. Key Features: - The bot should be able to generate quotes based on specific inputs provided by users. This will be its primary function. - It should also offer a range of customizable templates for the quotes it generates. This will help provide a personalized touch to the quotes. - The chatbot interface should be seamlessly integrated into my website, providing a smooth user experience. Ideal Skills and Experience: - Proficiency in Python is a must as it's the preferred language for this project. - Experience in building chatbots and working with natural language processing (NLP) would be highly beneficial. - Prior experience in developing similar quote generators or chatbots in Python is a...

    $533 (Avg Bid)
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    Project Objective: Develop 8 mini-games and collaborate with our developer to create an integrated system that allows the addition of games developed by you as well as third-party developers into our platform using a dedicated API. Role Description: • Multiplayer Game Development: Development of 4 skill-based games and 4 luck-based interactive and entertaining games, similar to those on poki.com. o Special Feature: Each game must include at least 8 power-ups that can be used during matches to enhance the gaming experience and introduce strategic elements. Each power-up must have 4 levels of potency, with higher levels yielding greater effects. Power-ups will be purchasable in-game items that users can buy and use during matches. Examples of power-ups for Tetris () can include: a) ...

    $1500 - $3000
    Featured Sealed
    $1500 - $3000
    28 bids

    I'm in urgent need of a skilled freelancer who can teach me how to make a Grafana dashboard. I have connected grafana to my SAP Cloud ALM system, and can see some data, so that is working fine. I have att a draft dashboard, we do not need to make them all, but just 2-3 widgets for this POC. And then more widgets later, if the end client buys the dashboard. What we need to do now, is to make sure, the data we need for the widgets are avaiable in the API from the link. I assume we can check this in 1 day The way of working is, that we sit together on a shared screen, and then you show me how grafana is working, and what to consider, while we are building 2-3 widgets. Please put ABC123 as the first word when you bid for the project, so I know you have read the description. Othe...

    $13 / hr (Avg Bid)
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    37 bids

    I'm looking for a skilled QA Engineer to help us capture the API requests and responses on our web pages. The primary focus of the project is to ensure the correct functioning of our JSON requests and responses. Key Responsibilities: - Capture and test authentication processes - Monitor and test CRUD operations - Validate error handling mechanisms - Identify and log all API requests and responses occurring on the frontend Your turn-around time is critical for us, and we need it completed as soon as possible. The ideal candidate should have: - Proficiency in using tools to capture JSON requests and responses - Extensive experience in API testing, particularly in Python or JavaScript - Strong understanding of authentication, CRUD operations, and error handling

    $5 / hr (Avg Bid)
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    23 bids

    I need a WordPress plugin that integrates my site with the VidaXL site via API. This plugin should enable the following functionality: 1. Import Products through API: Seamlessly import products from VidaXL to my WordPress site using the API. 2. Pricing Strategy Capabilities: Allow me to set pricing rules for the imported products to ensure competitive pricing and optimal profit margins. 3. Synchronize Orders: Synchronize orders between my site and VidaXL, ensuring consistent inventory management and order processing. Additional Details: 1. My website must be synchronized with the VidaXL website for dropshipping. 2. After receiving an order, it needs to be sent to VidaXL, which will then ship the product to my customer. 3. VidaXL will return the tracking number to the Danki website, wh...

    $180 (Avg Bid)
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    104 bids

    I am in need of a skilled Kotlin developer for an upcoming project. The project will involve advanced level Kotlin tasks, so an intermediate to advanced level of proficiency in this language is required. Candidate should be have minimum of 3 years of experience This project may involve: - Android app development - Backend programming - Code review and optimization It would be a plus if you have experience in a specific industry, but it's not a strict requirement. The most important aspect is your expertise in Kotlin and your ability to deliver high-quality work efficiently. Ideal Skills and Experience: - Proficiency in Kotlin - Previous experience working on Android apps and/or backend systems - Strong understanding of code review and optimization practices - Intermediate to advan...

    $313 (Avg Bid)
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    30 bids

    I'm in need of a developer who can create a mobile and web maze game that will captivate players of all ages. Key Requirements: - Development for both mobile and web platforms - Maze game genre - Appeal to a broad audience (kids, teens, and adults) ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- please note : * it is very sample and small game with 1 level (time from start until win is less than 4 minutes) * with 2 characters only (you will choice 1 chara...

    $1237 (Avg Bid)
    Featured NDA
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    Explicit Filtering Phase project as discussed in chat for phrase detection and resultant redirect.

    $470 (Avg Bid)
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    29 bids

    Um app onde os usuários interessados podem se cadastrar e ao informar o documento de registro de pessoa física, terão acesso a uma lista organizada por categorias de empresas fornecedores de produtos ou serviços. Estas empresas concedem descontos variados para seus usuários. Dados de origem : api rest nº 1 Dados de login e cadastro : Perfil deverá ser vinculado (completar) dados Nome, telefone, e-mail e mais alguns campos Consultar dados de convênios em catálogo e trazer informações sendo textos e imagens api rest nº 2 Consultar dados de convênios em catálogo e trazer informações sendo textos e imagens e exibindo como catálogo secundário. São dois catálo...

    $160 (Avg Bid)
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    6 bids

    Hola se necesita experto en Make para personalizar una API que conecte Bitrix24 y Quipu. EL objetivo es que una vez que se marque como pagada una factura en Quipu automáticamente también se marque como pagada en Bitrix24. Un saludo,

    $153 (Avg Bid)
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    11 bids

    Hola, estoy interesado en crear un sitio web con tecnologia de faceswap La idea central es que los usuarios puedan subir una foto para aplicar el efecto faceswapp generado por IA. Aca le envio el ejemplo de un juego dentro de facebook que realiza el intercambio. Mi idea es hacer algo similar pero no dentro de facebook app sino en una pagina web: aqui muestro un sitio web similar:

    $5153 (Avg Bid)
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    Dibutuhkan / dicari jasa pembuatan website slot/casino/judi online, yang sudah berpengalaman dalam pembuatan website slot/casino online, atau yang sudah menyediakan dengan white lable Tolong lampirkan juga portofolio website slot/casino online yang sudah pernah dibuat Di utamakan dari Indonesia Terima kasih

    $375 (Avg Bid)
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    19 bids

    Dibutuhkan / dicari jasa pembuatan website slot/casino/judi online, yang sudah berpengalaman dalam pembuatan website slot/casino online, atau yang sudah menyediakan dengan white lable Tolong lampirkan juga portofolio website slot/casino online yang sudah pernah dibuat Di utamakan dari Indonesia Terima kasih

    $20 / hr (Avg Bid)
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    24 bids

    Busco persona con conocimiento en Apis de mapa y que pueda modificar aplicaciones moviles, las apis se usaran en proyecto de reserva de taxi

    $183 (Avg Bid)
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    15 bids

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