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 188,766 reviews, clients rate our API Developers 4.86 out of 5 stars.
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    Hi! I’m looking for a developer to create an easy way for me to embed on my website custom chatbots I make in Claude, OpenAI GPT/Assistants etc., and limit each user’s access (by time spent and/or token amount). You’ll need to connect with APIs and create a very simple front-end interface for me to create chatbots (write prompts, upload files for training when applicable, choose OpenAI Assistants), manage the chatbots (edit/delete etc.), and see conversations and stats. Overview of what you need to develop and how it needs to work: 1. In the interface (which you will create) on my site, I create custom chatbots. The interface needs to have an orderly list of chatbots one beneath another. For each chatbot, I can select which primary service I want to use (Claude, Open...

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    API Integrations on WordPress 6 days left
    VERIFIED

    I need a capable developer with extensive experience in API integrations, specifically with WordPress, to integrate the PayPal API and a bank transfer payment method into my site. Key requirements include: - Fluent understanding and experience working with APIs, particularly PayPal's - Proficiency in WordPress and its various functions - Experience creating secure and reliable payment gateways One main feature that must be integrated within these payment methods is the functionality for subscription payments. This should be built with a user-friendly interface and have flawless functionality. Looking forward to people with the right skills sending in their bids for this project.

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    I'm seeking a skilled developer to help integrate the Shopify API with our Supplier platform. Our primary goal is to automate order request / fulfillment between these two platforms seamlessly. I synchronize products from the supplier using syncee. The problem with the data feed manager and external supplier at syncee is that you cannot make an order request to the supplier. Since the data feed contains special purchase prices, manual orders are not an option. I have attached a flow chart from the supplier on how the order request should be set up. Order request using POST. I assume this should be relatively easy to set up using the shopify api, php script and maybe webhooks. Key Requirements: - Build a reliable integration between Shopify and our Supplier platform. - Ensure the au...

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    necesito unas revisiones y personalizaciones de informes sobre un script comprado en codecanyon llamado Stock Manager Advance

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    I'm seeking an experienced Python developer with hands-on knowledge of stock market trading algorithms. The task primarily involves implementing proven trading strategies within a fully automated trading application. Below are my specific requirements: • Compatibility: The Python trading code must be compatible with the National Stock Exchange (NSE). • Algorithms: The code must incorporate 'moving averages' and the 'relative strength index (RSI)' into its algorithm to generate trading signals. • Data Sources: The software should leverage both real-time data feeds and historical data obtained from APIs to inform its trades. Programming in Python for algorithmic trading and understanding financial markets, especially the NSE, are essential qu...

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    I'm looking for an experienced widget developer who can create an inline code widget to be used with the ChatGPT API. The widget should display the results from this API on a specific page of my website. Here are specific requirements: - Search Box: A simple search box like google search bar - Display Area: display area should include text and link responses from chatgpt API. Skills and Experience Needed: - Expertise in widget development and inline code - Deep understanding of the ChatGPT API - Strong grasp on UI/UX for effective search box design

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    Looking for experience developer who can develop for me an arbitrage trading system. The requirements are the following: Connect 20 crypto exchanges (CEX) there API so can watch the prices of 100 cryptocurrencies which we will provide. Allow us to connect crypto exchanges accounts API with the arbitrage trading system and execute the trades by a single click. The system is for personal use. More details via call.

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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...

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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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    I have a current website setup where I sell digital products. My aim is to enable customers to complete their purchases using Payoneer payment links. I already have an active Payoneer account that can be used for this function. The job will involve: - Implementing Payoneer API to create payment links within my website. Your role will heavily rely on familiarity with Payoneer API and specifically leverage this resource: - Integrating the resulting code on my clickfunnels html, making it an adjustable feature On the payment page, I would like to capture various types of information: - Customer contact details - Customer preferences - Specific product details The ideal candidate for this project has experience in website development and has specifically worked with Payoneer API and Click...

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    I'm searching for a proficient PHP developer, armed with Javascript, MySQL, and API handling talents for my project. I aspire to build a custom jobs module on a site hosted using social networking script. • Essential Competencies: 1. Comprehensive module development 2. Expertise in PHP and Javascript 3. Firm understanding of MySQL and APIs • Project Objectives: 1. Job Search Functionality: Incorporate an effective search feature powered by job title or keyword, location, and industry or department filters. 2. Resume Submission and Storage: Establishment of a user-friendly interface that allows effortless resume submission and secure storage. 3. Application Tracking System: Implementation of a reliable tracking system to manage and monitor application statuses. The ...

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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.

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    I'm looking for a talented Power BI expert to create an interactive interface. The main requirements are: - Developing a Power BI interface where users can input an ID. - Calling a specific REST API using this ID (which requires authentication). - The hierarchical data received should be processed and transformed appropriately for display in a Power BI matrix. - The interface should offer intermediate levels of interactivity, such as drill-downs and data exploration. Ideal Skills and Experience: - Proficiency in Power BI. - Experience working with REST APIs, including handling authentication. - Strong understanding of hierarchical data structures. - Ability to process and transform data within Power BI. - Prior experience creating interactive and exploratory interfaces.] - Also unde...

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    We are seeking a software developer to create a solution that, through a form, allows the configuration of API usage parameters, such as headers and HTTP method (GET or POST), and the selection of data to send as filters, such as by name, identification number, or both, similar to the functionality of Postman for configuring requests on endpoints. This form should enable the creation of multiple API configurations for consumption. The initial response must be mapped with a list of preset fields and then generate a new response with the mapped information to standardize the response from all external sources to be configured. The results will be displayed independently in each API connector created in a table viewer as it comes from the source to perform mapping within the detail of the r...

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    We are seeking a software developer to create a solution that, through a form, allows the configuration of API usage parameters, such as headers and HTTP method (GET or POST), and the selection of data to send as filters, such as by name, identification number, or both, similar to the functionality of Postman for configuring requests on endpoints. This form should enable the creation of multiple API configurations for consumption. The initial response must be mapped with a list of preset fields and then generate a new response with the mapped information to standardize the response from all external sources to be configured. The results will be displayed independently in each API connector created in a table viewer as it comes from the source to perform mapping within the detail of the r...

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    I'm in need of a skilled and experienced WebFlow professional to incorporate a comprehensive membership system to my website. Here's a detailed account of the project requirements: - User Registration and Login: The primary requirement is that users can sign up and log in to the site. - User Profiles and Membership Levels: Each user should be able to create and manage their profiles. The system should support multiple membership levels for different types of users, such as consumers and business users. - Access Control and Content Restriction: Depending on their membership level, users should have access to different sections of the site, with content being restricted accordingly. - API Integration: I currently do not have an API set up for accessing data from WebFlow's MyS...

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    I'm seeking a skilled Python developer proficient in Selenium or other scraping tools, AI and others API integration. The main tasks in this project include: - Integrating APIs: You'll be responsible for seamlessly integrating the following APIs: - Send/reveive data from trained AI - Collect data using scraping - Payment Gateway - Other websites: API to integrate with other websites - Developing B2B Features: We're looking to expand our platform to cater for B2B transactions. Your role will be to create and incorporate features that facilitate B2B interactions. Key skills and experience required: - Proficient in Python - Experienced with Selenium or other scraping tools - Proven track record with API integration - exchange data with AI I'm looking for...

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    We are currently seeking a skilled developer to create a Chrome extension and associated API. This project will involve the development of an extension designed to interface with a specified financial website, which features dynamic data changes. The primary function of this extension will be to monitor the data displayed on the website's user interface (UI). When any alterations in this data occur, the extension should perform API calls to transmit this data to an API that stores it within a database. Additionally, there may be instances where the extension needs to make API calls based on UI events, retrieve data from the database, and display this information on the UI. There will also be certain situations requiring the extraction of data from external sources for storage in...

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    I'm seeking a skilled developer to assist in integrating a custom application with Constant Contact. Key Requirements: - Skilled in Pnp programming language - Experience with system integration - Able to work with Constant Contact APIs Your proposal should demonstrate your experience in integrating systems, particularly with Constant Contact. Prior work and references showcasing this expertise would be highly beneficial.

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    i need someone to work on my vps server where i am hosting a matrix homeserver. to create an iota identity management and integrate that with matrix sign up and log in authentication. the work needs to be done immediately. my budget is no more than 40 euros so please bid if you can work on that budget.

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    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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    API Research 2 days left
    VERIFIED

    As I mentioned in the Title. I need someone who can do the research for me to get some Important (and high quality) API‘s for me and my future Projects.

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    I am seeking a freelancer who specializes in ERP integration for a project involving the Dynamics GP and the Saudi Government's e-invoicing portal (Gov). Key responsibilities include establishing a connection to the Gov portal for e-invoicing, generating a QR code as part of the task, and ensuring complete compliance with the regulations in place. To be successful in this role, you should have: - Prior experience integrating ERP systems, particularly Dynamics GP - Familiarity with the Gov e-invoicing portal - Ability to generate QR codes - Understanding of compliance requirements in this context Please apply detailing your past experiences in similar roles. integration of ERP (Dynamics GP) with Government in Saudi Arabia for E-Invoice phase2. Some of Requirements: Connection to ...

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    I have the distilberd model in .onnx format. it cant be done with tflite as i have not used tensorflow in my project. i need a flutter developer to start the integration immediately. it is a model for text classification. my budget is no more than 25 euros for each model. i have 3 models in total all similar on the same application. please bid only if you have time and agree with the budget. i dont want any bargain

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    I'm looking for a Google Cloud Platform expert who specializes in Vertex AI Agents. Tasks: - Agents are all ready created and trained - Integrate Vertex AI - NOT the old Dialogflow - with a Wordpress website. - Create a UI on the website where users can interact seamlessly with the bot. Ideal Skills: - Deep knowledge in Google Cloud Platform and Vertex AI Agents. - Proven experience with Wordpress integration. - UI Optimisation skills for user-friendly bot interaction. - Strong understanding of google cloud platform credentials and permissions

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    I'm in need of an experienced AWS Java Specialist who can provide ongoing support for my project. My work involves the use of Lambda functions, DynamoDB integration, S3 bucket management, and CDK Implementation. The ideal candidate has a wealth of experience in these areas and can confidently assist me in navigating through the technical aspects of this project. Key Responsibilities: - AWS Lambda functions creation and management - Integration of DynamoDB - S3 bucket handling - Implementing and assisting with CDK Skills & Experience: - Proficient in AWS Java technologies - Past successful experience in the roles above - Understanding of Amazon Builds - a unique aspect of this task - Good communication skills and a team player mindset Please detail your past experiences relat...

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    PRIORITY IS TO HAVE A DEVELOPER ON OUR TEAM (LONG TERM) THAT CAN WORK WEEKENDS!! 1st task (IMMEDIATE): Fix pagination -> our webapp uses an api endpoint to load data from stored procedure that takes 30 seconds to run. Pagination + cache was implemented but the pagination was implements AFTER the api runs (30 second wait) and should be executed inside the stored procedure to start sending data to the front end immediately, after it has the first 30-50 records instead of waiting to receive the entire 6000+ current records. We implemented cache but would like developer to evaluate the possibility of using redis to improve performance. If you are awarded the task we expect you to accept IMMEDIATELY and if the project is not accepted immediatly we will award it to another developer. Thi...

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    I am seeking an experienced programmer for an API integration project between Close CRM and Grafana. Here're more details about the requirements: We can either use a JSON integration directly into Grafana or use a 3rd party tool like to fix it. Action Items / Visualisations to create: 1. Have a target for a segment (eg: x% of sales in segment) 2. Map out per rep 3. Need to evaluate Conversion rate for each step 4. Need to evaluate Conversion rate for Total Funnel (Lead to sale) 5. Need to evaluate Conversion rate for some sub steps (eg, Bill to Sale) - enables you to focus the team on key stages 6. In addition to company wide funnel, need to benchmark each BDM on the funnel stages 7. Understand where BDM's are strong and weak

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    We are seeking an experienced Azure/M365 developer to work on a project that involves fuzzy matching and data integration. The project involves taking 15-20 points of data from various sources, performing fuzzy matching, and integrating the data into our Azure/M365 environment. Requirements: Strong knowledge of Azure/M365 ecosystem, including Azure Data Factory, Azure Data Lake, and M365 Experience with fuzzy matching algorithms Proficiency in data integration and ETL processes Familiarity with MongoDB and data storage + M365 Integration Strong analytical and problem-solving skills Excellent communication and documentation skills Task Breakdown: Develop a fuzzy matching module to compare data across 15-20 points of data Implement additional...

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    Hi, Im looking for someone who helps me with my project. white label website with integrated TradingView libraries. We can break down the portal into different parts connected. 1 – SuperAdmin, For the owner that can overlook everything in the system (me) 2 - Admin will be the “shop owner” they can edit/add/remove products, and sell them (integrations) Admin can be a brand that will be editable and have its own logo and domain login with branding. 3 - User who log in to the “shop” and can purchase products 4 – Trading portal – Connecting Libraries from Tradingview with our own (redistributed by Admin) 5- Integrations – Possibility to add telegram/discord/chat between users / FB messenger/video presentation/YT -LIVE). For sure many more but ...

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    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.

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    Website on Wordpress License key generator with DB API for Excel Template connecting to DB for license key validation. Dashboard for administrator enter buyer/customer account credetials. The administrator must be able to enable and disablle accounts. Update Excel Template LicenseValidation code for connectiing to API/DB. I will privide this Excel Template code file.

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    I have a need for a desktop application that will integrate our SaaS web portal effectively with Tally for the purpose of incorporating a range of financial transactions. These will prominently feature: - Sales Transactions - Purchase Transactions - Expense Transactions - Receipts and Payments - Reports from Tally A successful applicant will have familiarity with TDL, data integration, specifically focused on Tally integration. Familiarity with financial data, particularly with Tally, is a necessity, as the project scope includes the integration of these financial transactions. With your expertise, I expect a user-friendly and versatile Tally Option, enabling smoother management of our financial data.

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    i need someone to work on my vps server where i am hosting a matrix homeserver. to create an iota identity management and integrate that with matrix sign up and log in authentication. the worn needs to be done immediately. my budget is no more than 40 euros so please bid if you can work on that budget.

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    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

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    i need someone to work on my vps server where i am hosting a matrix homeserver. to create an iota identity management and integrate that with matrix sign up and log in authentication. the worn needs to be done immediately. my budget is no more than 40 euros so please bid if you can work on that budget.

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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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    As a business, I am aiming to boost my inventory management processes by connecting my Point of Sale (POS), warehouse and inventory management to OpenAI chat GPT. Key Deliverables: - Integration with OpenAI chat GPT to improve inventory management and sales. - Implementation of predictive restocking to help forecast demand and avoid overstocking or stock outs. - Real-time inventory updates to keep the system current and reliable. - Automated inventory reporting to provide a clear overview of stock status, helping decision-making processes. - Daily advice on sales and discounts for clients based on the trends and patterns discerned from historical data. The ideal freelancer for this project should possess a strong background in AI and machine learning, with explicit knowledge of...

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

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    API Integration 6 days left

    Estamos buscando un desarrollador experto en WordPress para ayudar a terminar de crear nuestro sitio web de crowdfunding. Tenemos un sitio en WordPress y actualmente le falta el plugin (wp crowdfunding u otro que pueda funcionar de manera similar) para que funcione. Debería permitir a los usuarios ingresar con sus cuentas de Google y crear campañas. El único método de pago disponible en el sitio debería ser Mercado Pago (esto es esencial para el proyecto). Para referencia, debería funcionar de manera similar a GoFundMe, pero el método de pago debería ser Mercado Pago. El candidato ideal debería ser capaz de agregar el plugin y hacerlo funcionar, integrar Mercado Pago para las donaciones y garantizar que el sitio web sea segur...

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    Detin site pe platforma MerchantPro. Am anumite produse de pe o alta platforma adaugata si am nevoie de sincronizare de stocuri intre acestea. Sincronizarea se poate face cu ajutorul Postman prin API.

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    Je souhaiterai un développeur pour qu'il puisse me créer un CallBot, pour plus d'information, merci de me contacter.

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