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 186,525 reviews, clients rate our API Developers 4.86 out of 5 stars.
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    25 jobs found, pricing in USD

    I am in need of a competent developer to code my existing trading strategy tu run on Freqtrade. We will integrate the bot to Bybit. Key requirements: - Understanding of Freqtrade software - Prior experience in developing trading strategies - Knowledge of the Cryptocurrency market - Familiarity with the Bybit platform The ideal candidate will have a proven track record in developing strategies to run on Freqtrade and a comprehensive understanding of crypto trading.

    $250 (Avg Bid)
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    1 bids

    I am seeking an experienced API developer, proficient in one of this, Fastapi, NodeJS, or NestJS, to create an API focused on integrating colombia public data. Key Responsibilities: - Understand and integrate external public data sources. The ideal candidate will have experience in integrating APIs with public data sources. Skills and Experience: - Proficient in one ot this, Fastapi, NodeJS, or NestJS. - Experience in integrating APIs with public data sources.

    $19 (Avg Bid)
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    12 bids

    Hello, I just need a quick solution to send Whatsapp message using twilio API. In my twilio account, I have already [Whatsapp Business Account ID], [Meta Business Manager ID], [WhatsApp number] That is it. Thank you for your time and look forward to working with you.

    $8 / hr (Avg Bid)
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    Need C# developer to integrate zatca and below actions, Please contact if you have previous experience in zatca einvoice integration. Prefer to develop a rest Api to call zatca and input parameter will provide invoice in Json. Anyone has previous experience on zatca integration is preferred, we need to complete as soon as possible. 1. Create CSR certificate 2. Compliance Invoice with simulation and production 3. Clear Invoice with simulation and production 4. Report Invoice with simulation and production Note: We need source code, and it should be configured on our system.

    $1255 (Avg Bid)
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    15 bids

    I'm looking for a skilled professional to help me install the eBay API on my existing Ubuntu 22.04 server for the primary purpose of showing orders on webpage. here is the sdk - Key Responsibilities: - Installation of the eBay API on the Ubuntu 22.04 server. - Ensuring the API is correctly set up to show orders on webpage. Ideal Skills and Experience: - Proficiency in working with Ubuntu servers, particularly version 22.04. - Prior experience installing and configuring the eBay API. - Ability to implement API functionalities for showing orders on webpage. If you have a good understanding of eBay's API and are experienced in working with Ubuntu servers, I'd be interested in hearing from you. Please share your relevant experience and explain how you would tackle this tas...

    $29 (Avg Bid)
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    I've got around 50 image folders with less then 1000 files in jpg format, each with GPS metadata. I need an expert to convert this metadata into Google Earth points. Key requirements: - **Automatic Generation:** The points should be created by extracting metadata from the images, not manually added. - **Output Format:** I need the final points to be saved in KML format, for easy integration into Google Earth. - **Quality Assurance:** Accuracy is key, the points should correctly represent the image positions. They will be broken into 3 colours depending on the date they were taken, the data is in the folder name and file name. Ideal Skills: - **GPS Data Handling:** Understanding of how to extract and work with GPS metadata from images. - **Google Earth Proficiency:** Experie...

    $186 (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.

    $16 / hr (Avg Bid)
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    43 bids
    Desktop AI App for Mac 5 days left
    VERIFIED

    I am seeking a proficient developer to build a a Mac desktop application, primarily assisting with generative AI by allowing users to call both proprietary LLMs like OpenAI, Claude , Gemini and open source self hosted LLMs using ollama, LMstudio. The expected functionalities should include: • Image Generation: The app should be capable of rendering unique creations from existing databases, or random generation with specifications. • Music Composition: The app should generate original music based on selected parameters, showing its understanding of various music theories. • Text Generation: The app should produce coherent and relevant texts depending on the context provided. The ideal candidate would have prior experience in building Mac desktop app, AI apps and a solid un...

    $658 (Avg Bid)
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    16 bids

    We are in need of a proficient Flutter developer to enhance our mobile application. The focus of this project is to refine the functionality of the Trending Screen, specifically to display products currently available on Wishive, which are integrated with Woo-Commerce and modify the click behaviour for in-app web-view. API calls will be provided. Below is a detailed breakdown of the tasks involved: 1. **Modify Trending Screen:** - Remove the search bar object located under the Wishive Live Marketplace bar. - Delete categories (breadcrumb) displayed under the search bar. - Eliminate the "Add to Cart" button from the products taxonomy. - Modify the display of thumbnail product images to fetch from the CDN entry from API dataset instead of the internal media gallery. 2...

    $354 (Avg Bid)
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    I want a python script that will check the balance of my four wallets inj1.... (injective blockchain), cosmos1.... (cosmos blockchain), osmo1.... (osmo blockchain) and juno1.... (juno blockchain) every 5 seconds. And in case the INJ balance increases, ATOM. OSMO or JUNO, then the entire balance will be transferred fully automatically to another wallet inj1...., cosmos1...., osmo1.... and juno1.....

    $22 (Avg Bid)
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    3 bids

    Create a web application that combines information or functionalities from two or more web APIs in a useful and sensible way. This is called a Web Mashup. You are free to decide on the purpose of your application, and which Web APIs you use. However, the Web APIs you have selected need to work together to fulfil the purpose of your application. An example: An intelligent Flickr photo browser that displays photos related to user’s interest. This can be done by fetching user’s “like” from Facebook web API, and then use this information to retrieve Flickr photos (using Flickr search) related to user’s like. (Note: A good implementation of this application would be at a pass level) In a more sophisticated implementation, an analysis of user’s Facebook posts ...

    $91 (Avg Bid)
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    25 bids

    I need a dedicated expert to complete an order management application using Zoho Creator. The App is 75% completed by a former freelancer who has gone MIA. The application manages Mobile SIM Card ordering and ongoing support. The system is integrated with Zoho WorkDrive, Zoho CRM and Zoho Desk presently, however the Zoho Desk integration for the submission and updating of support requests seems to have some errors. The application is integrated to our soft switch to provide a testing function which I will go into more detail about with the successful freelancer. This has currently been tested through API integration to Enswitch, however needs finishing. We need further integration to our carrier/s through API for ordering, updating and cancelling of services. I have attached some d...

    $366 (Avg Bid)
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    I'm looking for a Laravel expert who can help me with the continued development of a web application. You should have extremley strong experience with FilamentPhp with package creation, multi-tenant, User authentication, Database integration, and API development. Key Requirements: - Strong experience in Laravel, particularly working with Laravel 11 - Expertise in integrating and optimizing a database within Laravel - Proficiency in creating secure user authentication systems - Previous experience with API development is a must - Knowledge in FilamentPHP is essential with good eye for design The ideal candidate should have a good understanding of modern web development techniques and be able to deliver clean, maintainable and well-documented code. A keen eye for detail, problem-solv...

    $13 / hr (Avg Bid)
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    118 bids

    I'm searching for a skilled ManyChat developer to integrate the platform with my WooCommerce store. Key features and marketing flow should be implemented. Key Functionalities Required: - Automated order notifications: I need to ensure my customers receive real-time updates regarding their orders. This feature is crucial for customer satisfaction and retention. - Abandoned cart reminders: An effective way to recover potential lost sales and enhance user experience. The system should intelligently send reminders to customers who abandoned items in their carts. - Marketing flow: I'm looking to implement a comprehensive marketing flow that enhances customer engagement and drives sales. This includes: - Welcome messages and product recommendations for new customers: This is a key ...

    $476 (Avg Bid)
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    Project: Development of a server and API for integration with an external distributor API and providing functionality to partners through a proprietary API. Objective: To create a reliable API gateway integrated with an external distributor's API, automating the processes of topping up gaming accounts, retrieving information about available games and pricing, and offering services to partners for their own use. Main Tasks and Requirements: Server Development: Setup and support of a server to handle API requests. Ensure continuous operation of the server and fast processing of requests. API Development and Implementation: Integration with the distributor's API to perform top-up operations, retrieve information about available games, prices, and denominations. Implementation of...

    $1248 (Avg Bid)
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    I'm in need of a skilled and experienced web developer who can work with Tonapi. Tools for: - Get Wallet Portfolio: example - Wallet PNL: example or (not finished yet) - Show Last 20 swap transactions Build membership system for Tools: - Admin dashboard to manage user, package, sales report, referral, email - Payment system using Toncoin - Referral system User dashboard member: - Add wallet to favorites - Upgrade membership

    $496 (Avg Bid)
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    110 bids

    I'm in urgent need of an API that generates temporary passwords for a Tuya smart lock. The main functionality I need is the ability to generate these passwords. The delivery method is not of concern as I just need a working sample of the JSON body for creating the API. Ideal Skills: - Experience with developing APIs, particularly for smart devices - Proficient in JSON and API design - Familiarity with the Tuya platform is a huge plus - Ability to work under a tight deadline - Excellent communication skills Please note that the project is required ASAP. We have obtained these locks , we try through api to create temporary passwords like it can be done through the app without luck. Also the device permision is on read. Can it change? We have tried both the Smart Home Basic and the ...

    $188 (Avg Bid)
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    11 bids
    Crypto Algo Trading - Python 2 days left
    VERIFIED

    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.

    $13 / hr (Avg Bid)
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    30 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.

    $23 / hr (Avg Bid)
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    67 bids

    I'm looking for a Python developer proficient in Twilio to help me integrate 2-way voice functionality into my application. Key Requirements: - Integration of Twilio's Voice API: The primary focus of this project is on handling voice calls in a 2-way manner through Twilio's Voice API. We are using third party applications for STT, TTS and we are able to stream live calls from Twilio to our APIs, however, we are unable to send the new voice generated back to Twilio, error is coming. So kindly quote only if you have expertise in twilio and have worked on similar or same use case earlier. If satisfied, we will consult you again and again in our platform development using multiple features/integrations from Twilio.

    $51 (Avg Bid)
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    6 bids
    B2B Maintenance and upgrades v2 23 hours left
    VERIFIED

    We would like to extend into a new phase of the B2B project with maintenance and upgrades.

    $18 / hr (Avg Bid)
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    78 bids

    We are looking for a talented and adaptable developer to join our team and work on a variety of website development projects. The ideal candidate should be comfortable working without a precise task description and should be able to create high quality websites, replicating the functionality and design of existing portals. Task: Create a site similar to: - Analyse the specified website portal and replicate its functionality, design and user experience. - Create a visually appealing and user-friendly design based on the aesthetics and layout of the existing portal, without exact design specifications. - Experience with Wordpress or building CMS on frameworks. - Experience with web scraping tasks. - Working through APIs including AI services. - Full-stack website programming experience. - ...

    $1060 (Avg Bid)
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    188 bids

    I am looking for a Big Commerce developer who can customize my online store based on my specific requirements. The focus of this project will be on enhancing the functionality and features of the store. I have a detailed list of the desired features that I would like to be implemented, and I am looking for a developer who can work on going based. Ideal skills and experience: - Strong experience with Big Commerce customization and development - Able to change some functionality. - Knowledge of HTML, CSS, and JavaScript - Ability to work efficiently and meet deadlines. -Our store is live so need to work on sandbox first

    $18 - $150
    Sealed NDA
    $18 - $150
    10 bids

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

    $470 (Avg Bid)
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    AboutNerd 1 day left

    "AboutNerd" é um destino online para entusiastas de tecnologia que buscam os últimos gadgets, dispositivos eletrônicos e acessórios inovadores. Com uma ampla gama de produtos tecnológicos de alta qualidade, desde smartphones e laptops até gadgets inteligentes e wearables, o AboutNerd oferece uma experiência de compra conveniente e inspiradora para os aficionados por tecnologia de todas as idades. Preciso de um especialista para fazer páginas de venda e dar manutenção ao e-commerce.

    $407 (Avg Bid)
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    36 bids

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