API stands for Application Programming Interface, and it is an layer of interface that allows programs to interact with each other. An experienced API developer can build complex interactions between applications, making them faster, more reliable, and accurate. Whether you need a second opinion on your existing application or you want to create an entirely new application for your business, an expert API Developer can do the job for you.

An API Developer's job does not stop at developing. They can also work on design and implementation testing, guide through the entire architect process from prototyping to implementation, create custom system integration solution based on the project requirements, and collaborate with other teams to develop systems that meet customer expectations.

When hiring an API Developer through Freelancer.com, rest assured that they are as competent as any hired onsite software engineer.

Here’s some projects our experts have worked on:

  • Building custom interfaces to move large amounts of data efficiently between applications
  • Working with Javascript to allow websites to access external information relating to weather conditions
  • Creating Grafana dashboards for quick and easy visualization of data points
  • Developing scripts to connect external APIs with more heavy-duty platforms like Microsoft Azure
  • Debugging mobile apps involving fishing
  • Integrating AI capabilities into online shops
  • Automating regression tests so developers can work faster and more accurately

No matter what your business needs are in terms of API development, our expert freelancers are ready to take on the challenge and provide support whenever you need it. With expertise in debugging applications and web development, you're guaranteed to find the right developer for your project! So why wait? Post your project today at Freelancers.com and reap the benefits of working with an expert API Developer now!

From 186,760 reviews, clients rate our API Developers 4.86 out of 5 stars.
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    26 jobs found, pricing in INR

    I have flutter application I want to integrate the api in the api

    ₹1078 (Avg Bid)
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    7 bids

    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 am looking for a freelancer who can integrate the PayPal Checkout service into SendPulse service. The ideal candidate should have experience with API integration and be able to redirect users to a separate PayPal page for payment processing. We require this procedure: 1. SendPulse issues a PayPal link for the customer. 2. PayPal Payment page opens and there are option to pay by Debit Card , Credit Card. 3. After payment successful the api send back to SendPulse. 4. SendPulse receives the unique payment status as : successful payment , rejected payment or pending payment. Skills and experience needed for this project: - API integration - PayPal Checkout service integration - Strong problem-solving skills The job will be through Anydesk and Zoom Call

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    More details: What type of dynamic UI content do you want on your website? Interactive forms, Real-time updates What specific functionality do you need in the interactive forms? Data validation, File uploads, Conditional logic What APIs or services would you like to integrate into your website? Social media login, Email marketing

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    I'm urgently looking for expertise in uninstalling an API key from a Ziraxia application. The platform on which the application is installed is currently unknown, therefore, a candidate who has extensive experience across Windows, macOS, and Linux platforms will be highly regarded. Skills and Experience: - Proficiency in working with different operating systems - Experience with Ziraxia applications - Proficiency in handling API keys Although it's unclear which information successful applicants are required to include in their application, it's more likely that I would consider those who provide details of their past work, experience, and detailed project proposals related to similar tasks. This is an urgently required service, and so candidates who can begin immediatel...

    ₹1742 / hr (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.

    ₹1078 / hr (Avg Bid)
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    45 bids

    Overview: Seeking experienced Core PHP developer to update existing APIs and develop new ones for grocery app, admin panel, and driver app. 60-70% of API work already done; focus on updates and new features. Responsibilities: * Review existing API architecture and functionality. * Gather updated requirements for apps from team. * Update existing APIs to reflect new requirements. * Develop new APIs for additional features. * Ensure seamless integration with existing system. * Implement security measures and authentication. * Test thoroughly for bugs and optimize performance. * Coordinate with team for front-end integration. * Provide documentation and support. Requirements: * Proven Core PHP API development experience. * Familiarity with maintaining and updating APIs. * Proficiency in ...

    ₹27709 (Avg Bid)
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    I require an API expert with in-depth knowledge of Taobao's functionalities and structure. You'll be tasked with incorporating both searching and price comparison features into my website. Key responsibilities will include: - Ensuring seamless integration of the product search functionality using the Taobao API. This will allow users to search by product names and categories. - Implementing a feature that allows users to analyze price comparison on the platform. - Retrofitting the feature to fetch the SKU of the products from the API. Ideal candidates should: - Have prior experience with Taobao API, and understand its intricacies. - Be proficient at integrating APIs into websites. - Have a robust problem-solving attitude to troubleshoot and overcome potential API limitations or...

    ₹13937 (Avg Bid)
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    We are looking to connect our payment platform to GHL. In GHL we will add a tab that directs to our URL via in an iframe format so the GHL user does not leave the app. What we are looking to do is connect the contacts and products in GHL to our payment app. We would like to do this via a simple middleware application where we use the API key for GHL and our API key. Once connected the systems will automatically sync contacts and products. We are looking to get this completed immediately.

    ₹11946 (Avg Bid)
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    16 bids

    I’m looking for a skilled Data Scientist and Analyst to develop an energy tariff aggregation tool. This tool will be specifically focused on electricity tariffs within the USA. Key Features/Functions: - Real-Time Data Updates: The tool should be capable of providing real-time updates on energy tariffs. - Customizable Filters: Users should be able to filter information based on their unique criteria. Ideal Skills: - Strong experience with data science and analysis - Solid understanding of energy tariffs, particularly electricity tariffs - Prior experience with creating aggregation tools - Familiarity with US energy sector would be advantageous. This is a prime opportunity for someone who understands how to create a tool that is user-friendly, efficient and effective.

    ₹1536 / hr (Avg Bid)
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    AI Powerhouse Needed Now! 3 days left
    VERIFIED

    I'm seeking a highly skilled AI (Large Language Models - LLM) Engineer, with a clear focus and expertise in the realms of Data Analysis, Algorithm Development, and Machine Learning Model Training. This project has an immediate need, with a timeline marked as ASAP. Here are the specifics: I have AI LLM models some are free and some with paid API, I want to use them to generate questions and evaluate these questions based on certain criteria. the results should be examples of questions and the results of the evaluations of these questions. I already have the models I just want some tweecking in the results in order to use it.

    ₹16260 (Avg Bid)
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    29 bids
    GoHighLevel API Expert Needed 2 days left
    VERIFIED

    We are looking to connect our payment platform to GHL. In GHL we will add a tab that directs to our URL via in an iframe format so the GHL user does not leave the app. What we are looking to do is connect the contacts and products in GHL to our payment app. We would like to do this via a simple middleware application where we use the API key for GHL and our API key. Once connected the systems will automatically sync contacts and products. We are looking to get this completed immediately.

    ₹9789 (Avg Bid)
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    12 bids

    We're looking for someone who can configure our email campaign software to our CRM via either a webhook or API. We use Reachinbox, which is very similiar to and and have yet to decide on the CRM but are going with either Nutshell CRM or Pipedrive. Please note that Reachinbox is not configured with Zapier yet.

    ₹11117 (Avg Bid)
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    24 bids

    In React, this application's main feature should fetch player statistics from the MongoDB Atlas Data API using https requests. (Axio?) - Proficiency in React web app development - Solid experience working with MongoDB Atlas Data API - Ability to fetch and handle statistical data that is already formatted in JSON records - Ensuring data is retrieved accurately and displayed in a user-friendly manner. The goal: Bare minimum design as I can work on that myself, but want the functionality. Functionality: - Index/home page will have a search bar. When a user types in a player name, it automatically filters based on letters typed. - Then when clicking on player name, each player should have their own page that is created dynamically. Once entered into player page, I want the stats di...

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    As an active Teamup Calendar user, I'm seeking a reliable freelancer to design and implement a system that sends daily WhatsApp reminders from my calendar entries to individual recipients. Key responsibilities are: - Develop a system that extracts daily events from Teamup Calendar - Integrate this system with WhatsApp to deliver reminders from these calendar entries - Reminders must be scheduled to be sent to individual recipients An ideal freelancer must have proven experience in working with WhatsApp and Teamup API integrations. Proficiency in programming languages suitable for these APIs is absolutely essential. Anyone who has done similar tasks will have a clear advantage.

    ₹45379 (Avg Bid)
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    I'm in need of a proficient developer who can create an Amibroker plugin to fetch and backfill data in real-time from the National Stock Exchange (NSE). Your tasks will include: - Fetching tick data in real-time - Retrieving and incorporating historical data The successful freelancer should have: - Profound knowledge and experience in programming and creating plugins - Comprehensive experience working with NSE data - Deep understanding of tick data and historical data implications on trading The project needs to be completed ASAP, therefore, the freelancer will require strong time management and communication skills to deliver within the tight deadline.

    ₹57906 (Avg Bid)
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    We connect to a lot of Apps through REST API. We are looking to pull more types of data. We already have built all the functionality to retrieve data so its mostly configure to retrieve new types of data. 1. It a plus if you have worked with REST API before but not required. 2. You do have to be an experienced PHP Developer. 3. We website is built with WordPress so WP experience is a plus.

    ₹1078 / hr (Avg Bid)
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    127 bids

    We're looking for someone who can configure our email campaign software to our CRM via either a webhook or API. We use Reachinbox, which is very similiar to and and have yet to decide on the CRM but are going with either Nutshell CRM or Pipedrive. Please note that Reachinbox is not configured with Zapier yet.

    ₹15348 (Avg Bid)
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    31 bids

    I'm seeking a skilled developer to implement a system that sends our customers push notifications on WhatsApp concerning their orders. Our existing database manages order updates and statuses effectively, and now we aim to leverage this data to enhance our customer service and engagement. **Key Requirements:** - Fetch data from our database, specifically: order status, order number, and estimated delivery time. - The developer should ensure that push notifications are sent to customers via WhatsApp only when their order is shipped or delivered, minimizing spam and focusing on critical updates. - It is crucial that our customers, who have already opted in by providing their phone numbers for WhatsApp notifications, receive these updates seamlessly and reliably. **Ideal Skills and Exp...

    ₹10370 (Avg Bid)
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    7 bids
    Java API Specialist Wanted 20 hours left
    VERIFIED

    I'm looking for a Java guru who can develop an API that can handle Application numerical data. This API is intended to integrate with web services and mobile applications. - What you need: - Extensive Java programming experience - Proven ability to develop APIs - Experience with numerical data - API testing with pos - API expert with WordPress This project will challenge you to create an efficient, effective API that seamlessly integrates with multiple platforms. Let's collaborate and create something incredible!

    ₹7408 (Avg Bid)
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    16 bids
    Web API Expert Needed 17 hours left
    VERIFIED

    I am Looking for a Go High Level Expert who have experience with API and White label , we have some custom API Requirement for the GHL which will be used by our client Account , Need someone who have Experience with GHL and Coding Experience I already had a bad experience with Freelancer who took the job and never get it done , I need someone who can take the Job and Get started on it right away and get it done within some time ...no delay .if you did will I will Bonus you Time wasters stay Away

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    More details: What features do you want the flight booking webservice to have? Search and compare flights, Book flights online, Display flight details and prices What payment methods would you like to offer for booking flights online? PayPal Which platforms do you want the flight booking webservice to be accessible on? Web browser

    ₹27626 (Avg Bid)
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    8 bids

    I'm looking for a freelancer to integrate Stripe Connect into my multi-platform online marketplace. I aim to include both destination charges and separate charges and transfers functionalities to streamline payments between users. **Key Requirements:** - **Programming Skills:** Proficient in JavaScript for our web components, Swift for iOS, and PHP alongside HTML for our desktop website. Knowledge of integrating Stripe Connect with these technologies is a must. - **API Integration:** Experience in connecting APIs, specifically Stripe Connect API, to enable seamless transactions across our platform. - **Stripe Connect Features:** Implementing Destination Charges and Separate Charges and Transfers. Familiarity with these specific Stripe Connect features is essential. **Ideal Candidat...

    ₹198274 (Avg Bid)
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    API Expert Needed 2 hours left
    VERIFIED

    I am Looking for a Go High Level Expert who have experience with API and White label , we have some custom API Requirement for the GHL which will be used by our client Account , Need someone who have Experience with GHL and Coding Experience I already had a bad experience with Freelancer who took the job and never get it done , I need someone who can take the Job and Get started on it right away and get it done within some time ...no delay .if you did will I will Bonus you Time wasters stay Away

    ₹5807 (Avg Bid)
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    I need a specialist who can meticulously scrape EAN and price details from Allegro.Pl. The pertinent details will then need to be organized into an Excel file. Requirements: - Proficient in data scrapping, particularly from - Able to compile relevant data into Excel format - Ensured accuracy in EAN and price information Ideal candidate would have previous experience in scrapping data from eCommerce platforms, with strong familiarity with Excel. I will give you logins where i can find all eans by specific search, example if i enter numbers 59 i get eans with these numbers, but there isn't visible prices, allegro has developer API, but i do not know it it helps.

    ₹3899 (Avg Bid)
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    36 bids

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

    ₹38991 (Avg Bid)
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    29 bids

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