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 188,251 reviews, clients rate our API Developers 4.87 out of 5 stars.
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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...

    $2651 (Avg Bid)
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    34 bids

    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...

    $2383 (Avg Bid)
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    76 bids

    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...

    $1104 (Avg Bid)
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    140 bids

    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...

    $3305 (Avg Bid)
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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...

    $30 / hr (Avg Bid)
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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.

    $172 (Avg Bid)
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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.

    $25 (Avg Bid)
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    11 bids

    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:

    $6 / hr (Avg Bid)
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    API Research 5 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.

    $24 (Avg Bid)
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    16 bids

    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

    $28 (Avg Bid)
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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

    $161 (Avg Bid)
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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...

    $12 / hr (Avg Bid)
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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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    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...

    $4354 (Avg Bid)
    NDA
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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 ...

    $4266 (Avg Bid)
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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.

    $267 (Avg Bid)
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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.

    $60 (Avg Bid)
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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.

    $112 (Avg Bid)
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    11 bids

    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.

    $30 (Avg Bid)
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    10 bids

    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

    $479 (Avg Bid)
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    34 bids

    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.

    $26 (Avg Bid)
    $26 Avg Bid
    14 bids

    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...

    $280 (Avg Bid)
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    I am looking for a skilled programmer with experience in algo trading using Python - preferably with experience with crypto exchange API. I already have a specific strategy in mind, so I would like someone who can work with me to implement it. Ideal skills for this job include proficiency in Python and experience in API trading. I am looking for a programmer who can work with me on a long term basis with support. Details can be discussed.

    $15 / hr (Avg Bid)
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    Language: Python Description: I am currently developing a Python application using PyQt to integrate with the Vipps payment API. The application is intended to initiate a payment process through Vipps, and upon successful completion of the payment, it should update the GUI to indicate a successful transaction or revert to the initial state if the payment fails or is aborted. Problem: The main challenge I am facing is that the application does not correctly detect and handle the completion of the payment process. Specifically, the application struggles to: Detect when a payment has been successfully completed or when a payment has failed. Execute subsequent actions based on the payment's outcome. This issue appears to be related to the handling of the API's responses and the a...

    $40 (Avg Bid)
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    Multi-Website Price Scraping 2 days left
    VERIFIED

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

    $11 / hr (Avg Bid)
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    62 bids
    React CRM Development 1 day left
    VERIFIED

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

    $33 / hr (Avg Bid)
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    131 bids

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

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

    $14 / hr (Avg Bid)
    NDA
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    I'm seeking a professional who can help me to integrate vapi and gohighlevel. Freelancer who has already experience will be easy to do this. If I confirm, then I will release immediately.

    $167 (Avg Bid)
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    We are seeking a highly experienced Senior AI Engineer who has a proven track record of working with Solana. As a Senior AI Engineer, you will be responsible for developing and maintaining high-performance applications using AI and Solana. This role requires a deep understanding of Rust programming language and Solana blockchain technology. You will collaborate with our team to design and implement efficient and scalable solutions. The ideal candidate should have excellent problem-solving skills, strong communication abilities, and a passion for clean and efficient code. Skills required: - Strong experience with AI - Solid understanding of Solana blockchain technology - Proficient in designing and developing efficient and scalable applications - Excellent problem-solving and troubleshoot...

    $50 / hr (Avg Bid)
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    28 bids
    Algo Trading setup 6 hours left
    VERIFIED

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

    $127 (Avg Bid)
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    I need a custom plugin designed to integrate with WooCommerce. This plugin must interface with three travel agency operators using an XML API. It should include a daily cron job set for a specific time to update travel packages, fully integrated with WooCommerce. This ensures that when a travel purchase is made, it verifies availability with the operator’s API before proceeding with the purchase. The plugin will manage travel packages from the backoffice but also needs to support a shortcode for frontend implementation, displaying a search and filters along with a listing. A similar plugin can be found at However, my requirement is slightly different, as it must utilize the operator’s XML API and confirm the package's availability with the operator before purchas...

    $513 (Avg Bid)
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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...

    $2952 (Avg Bid)
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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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    Atualmente utilizo o ERP Sige Cloud e gostaria de migrar os dados para OMIE, existem 2 formas de migração, api ou excel. A melhor opção para mim seria por API pois vi que há uma forma de importar pedidos ja existentes

    $16 / hr (Avg Bid)
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    3 bids

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