Hire the Best Application Integration Specialists

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4.7/5
Based on 39,307 client reviews
Brijesh Y.

Azamgarh, India

$15/hr
5.0
523 jobs

I am a full-stack PHP web developer with more than 14 years of experience in web development and API integration.I develop web applications using PHP, MySQL, WordPress, and Laravel.My goal has always been to create websites that are not only highly functional but also completely focused on the needs of the client . I have successfully integrated over 300 APIs globally, which has equipped me with expert skills in API integration.Here are some of the API integrations I have successfully completed. Api Development : Housecall Api integration , Jot Form api , Jobs api Avionté API , Redtail Api , lovable ai , Infusionsoft Api , Ebay Api , Cj Api  , Linkshare Api  . Adbutler Api  . Shopping Api , twitter Api , Instagrame Api , Quickbook Api  , Quickbase  Api  ,Small2invoice Api  , Zoho Api  , whereismypartnersApi  , Shopify Api ,Saasu Api , Xero Api ,Facebook Api , Linkedin Api , Zoho Crm and Zoho Api , Odoo Api , HubSpot Api , OntraPort  Api ,Contact Contact APi , Insighlty Api  , Constant Contact Api , Discogs Api , MyobApi , Infusionsoft Api , Shipit Api , Unleashed Api , paymeapi Api , OneSignalApi , Qualtricsapi ,  Yodlee  Api , Discogs API ,Qualtrics api ,webtickets Api, RunSignUp  API , spotifyApi , Spyfuapi ,  Active Campaign Api , Teamleader Api,  Litmos API , Billing orchard Api , Zapier  Api, Woocommerce Api , ActiveCampaign Api Freshdesk api , Api Developer , ChargeBee Api , Magento api , zapierapi , garminapi , GoHighLevel CRM , Fitbitapi , securionpayapi , Parcel Pro API , trybookingApi Booqable api , Commcare Api , Angaza API , escrow, Commcare Api , Angaza Api . ProcoreApi , totalexpert Api , filevine Api , bamboohrapi , bisweb api , data cityofnewyork, hubstaffapi , Phone Wagon API ,Go Highlevel API , payleadrApi ,  Quickbooks Api, Xero api , MyOb api ,spyfuapi , Reckon api debitsuccess Api  , activecampaign automation , fieldroutesapi , Capsule CRM Api , Inventory Planner API , SKUSavvy Api , Capsule CRM , GoHighLevel ,Hubspot api , FieldRoutes , klaviyo , bookeo api , Elevenlabs Api , GoHighLevel api , GHL api , Usps , Ups , Fedex shipengine, Parcel Pro Api ,Google Sheets Automation , GoHighLevel Automation , Google Apps Script integration with Api. Specialist in the following domains:     - Front End development , Back-end development, Full Stack PHP, Laravel, CodeIgniter, Cakephp.     - Shopify, WordPress, Webflow, Custom Wordpress Plugin , Custom Wordpress Theme. - Wordpress widget development, Created Leaderboard by using the 3rd party api data     - Wordpress Custom plugin and Wordpress themes development , Wordpress Api integration       - Wordpress Woocommerce orders and customer synch with 3rd party site   - n8n Workflow automation , SuiteDash customization ,Website development in the Lovable Reasons to select my services: - I possess a demonstrated history of producing high-quality work. - I offer clients continuous support following the project's completion. Should we collaborate, I am dedicated to delivering high-quality work efficiently. After completing a project, I offer continuous support to ensure the applications are error-free and highly adaptable for end users. Feel free to reach out with any inquiries, and I will respond promptly..

  • WordPress Development
  • API Development
  • jQuery
  • API Integration
  • PHP
  • RESTful API
  • SOAP
  • WordPress Theme
  • WordPress Plugin
  • WordPress e-Commerce
  • API
  • Chatbot Development
  • SaaS
  • Cloud Application
  • WordPress Website
Umer S.

Lahore, Pakistan

$25/hr
4.7
157 jobs

With 13 years of expertise as a professional API Integration & Web Application Developer , I am deeply passionate about leveraging the latest technologies to provide top quality services to my clients.. I continuously leverage the latest technologies in web applications, with extensive experience in AI, tools, apps, and integrations . Having managed over 100+ CRM automations, setups, and integrations, I excel in crafting business applications tailored to fulfill your operational needs and streamline your business processes effectively. I am titled as quick learner, adaptable, self-starter, team player, quality minded, focused, committed and able to work independently. I will provide personalized world class IT & Web solutions for your business. Proven expertise and dozens of successfully completed projects. My core expertise are: - API Integration & Automations. - REST & SOAP API's. - Experienced with Workflow Automation apps like Make.com, n8n.io, Zapie etc. - CRM (Odoo, Zoho , GoHighLevel etc) Integration & Business Setups. - Web Application Development - Custom Business Software Development - AI Integration & Automations Advantages for you: • ease and comfort of communication • flexibility in managing • new ideas generation regarding improvement of your Product • the reliable partner I have worked in PHP, Curl , Laravel, HTML, CSS, Javascript, AJAX, Flash, Flex, MySQL, Prototype, jQuery and other web programming technologies and platforms. You have smart and interesting idea, and do not know how to make it life? Just contact us and we'll make your project life! You can ask, why are we so confident? We will answer - 'Because We Know How!' • Web Development: Responsive websites, micro sites and web services creation based on a custom architecture using PHP, Laravel, ASP.NET, HTML5 on based on the best open source content management systems: WordPress, Joomla!, Drupal, Magento. Our specialists will consult you about fastest, easiest and the most useful options, so you save your time for more important questions. • Databases: A MYSQL, Oracle, MS SQL Server, SQL PLUS, etc. • Design Studios: Dreamweaver, Photoshop etc. My Objective is to provide the best upshot and satisfaction to my clients Feel free to share your business requirements and let's make your IDEAS into REALITY

  • Ecommerce Website Development
  • API Integration
  • API Development
  • WordPress
  • Magento
  • Database Design
  • Web Development
Osama S.

Islamabad, Pakistan

$40/hr
5.0
8 jobs

Integrated systems rarely break on the first successful API call. They break three weeks later: a failed Shopify webhook, an ERP order that never synced, a CRM contact missing from the pipeline, or POS inventory that no longer matches the store. I build and fix the middleware/API layer behind those systems. My strongest work is around Shopify, ERP, CRM, POS, and Laravel-based backend systems where product data, orders, inventory, customers, payments, and reporting all need to stay aligned. What I usually handle: - Shopify / Shopify Plus integrations and custom commerce workflows - ERP and CRM syncs: Acumatica, Salesforce, Zoho, HubSpot, SAP-style systems - POS and inventory workflows: Clover, store operations, loyalty, order flows - Laravel/PHP middleware, APIs, webhooks, queues, cron jobs, retries, and logs - Admin dashboards, reporting panels, and operational data models - Production debugging where the issue is hidden across multiple systems Relevant background: - Built and supported systems handling 24k+ products, 3M+ users, and 2,000+ locations - Led technical delivery across teams of 20+ - Worked across Shopify, Shopify Plus, Magento, BigCommerce, Acumatica, Salesforce, Zoho, Clover POS, Laravel, REST/GraphQL APIs, PostgreSQL, MySQL, AWS, Firebase, and payment systems I also take on SaaS MVPs and React Native app work when the project depends on backend architecture, integrations, subscriptions, analytics, or production stability. If your store, ERP, CRM, POS, or internal dashboard is held together by fragile syncs and unclear data flow, I can help trace where it breaks and make the system reliable.

  • Laravel
  • ERP Software
  • HubSpot
  • Shopify Plus
  • Magento
  • SAP
  • Acumatica
  • Salesforce
  • API Integration
  • SaaS Development
  • Web Application Development
  • Zoho CRM
  • JavaScript
  • Ecommerce Platform
  • Stripe
  • Clover POS System
  • Firebase
  • Liquid
  • Google Analytics 4
Christopher S.

Bonsecours, Canada

$45/hr
4.8
114 jobs

I help businesses replace spreadsheets, Microsoft Access databases, and manual workflows with user friendly software systems, built around how they actually operate. Most of the companies I work with have reached a point where their existing processes are no longer scaling efficiently: -spreadsheets becoming difficult to manage -disconnected tools and duplicated data -too much manual work -lack of visibility into operations -systems that have simply outgrown their original purpose That’s where I come in. I specialize in building operational business systems such as: • CRM / ERP / MRP systems • Inventory and order management systems • Job tracking and workforce systems • Quoting and estimating tools • Dashboards and reporting platforms • Automated workflows and integrations • Microsoft Access to Web App conversions My approach is different from most custom development because I build using a proven, custom framework and architecture refined across dozens of real-world business applications. This allows me to deliver: ✔ Faster development ✔ Lower overall project cost ✔ Reliable and scalable systems ✔ Clean, maintainable code ✔ Consistent workflows and user experience With this approach, you’re not paying to reinvent the wheel - you’re benefiting from systems and patterns that have already been proven in production environments. Before transitioning into software development full-time, I spent 8 years working in engineering and manufacturing in Canada. That experience gives me a strong understanding of operational workflows, process design, and the real-world business challenges behind the software. Today, I have: 🏆 Nearly 100 successfully completed projects on Upwork 🏆 100% Job Success Score maintained for over 8 years 🏆 Extensive experience with complex operational systems and custom workflows I’m also a strong believer in transparency and long-term reliability. -Clear and honest communication throughout projects -Fixed-price projects whenever possible -Strong internal QA/testing process -Lifetime bug-fix guarantee on fixed-rate builds If your current systems are slowing your business down, feel free to reach out. I’m always happy to take a look and discuss possible solutions.

  • Engineering & Architecture
  • Microsoft Access
  • Database Design
  • System Automation
  • Database Architecture
  • Microsoft Access Programming
  • Bug Fix
  • SQL
  • JavaScript
  • PHP
  • Web Design
  • Microsoft Excel
  • Business Application Development Language
  • Automated Workflow
Zain A.

Multan, Pakistan

$8/hr
5.0
19 jobs

I help startups and businesses build SaaS platforms, API integrations, automation systems, and custom web applications that scale from MVP to production. Most of my work involves developing SaaS products, multi-tenant systems, admin dashboards, and APIs where performance, structure, and long-term scalability matter. I focus on building systems that are stable, maintainable, and ready for real users, not quick fixes or temporary solutions. Clients usually come to me when they need to: • Build a custom web application from scratch • Develop an MVP to validate and launch a product • Create a SaaS platform with user roles, subscriptions, and scalable architecture • Build admin dashboards or internal business tools • Develop backend APIs for web or mobile applications • Replace plugin-based setups with clean, structured systems I work across both frontend and backend, keeping application logic, database structure, and user experience aligned. Whether it’s a landing page supporting a product or a full SaaS platform with complex workflows, the goal is always to build something reliable and easy to extend. In addition to core development, I integrate AI and automation into real systems where they add practical value. This includes AI-powered features, workflow automation, API-based integrations, and business process automation using tools like n8n, Zapier, and custom backend logic — not isolated demos. I follow a structured development approach: clear requirements, clean code, realistic timelines, and transparent communication. The systems I build are designed to be understood, maintained, and improved over time. What I work on • Full-stack web applications and SaaS platforms • SaaS MVP development and multi-tenant systems • Backend development and REST API design • Admin panels, dashboards, and internal tools • Authentication, authorization, and secure systems • Payment gateway and third-party API integrations • Database design, optimization, and backend architecture • AI-powered features and automation workflows (n8n, APIs, business logic) Core Technologies • PHP (Laravel) • JavaScript (Vue.js, React, Next.js) • Python (AI & backend services) • Databases: MySQL, PostgreSQL • REST APIs, webhooks, third-party integrations Keywords Full-Stack Developer, SaaS Developer, SaaS Application Development, SaaS MVP Development, Multi-Tenant SaaS, Custom Web Application Developer, Backend Developer, Laravel Developer, PHP Developer, JavaScript Developer, Vue.js Developer, React Developer, API Development, REST API Development, Backend & Frontend Development, Admin Dashboard Development, Database Design, MySQL, PostgreSQL, Authentication & Authorization, Payment Gateway Integration, Third-Party API Integration, Internal Tools Development, Scalable Web Applications, AI Integration, AI Automation, Workflow Automation, API Automation, n8n, Zapier Integration, Make (Integromat), Business Process Automation, Clean Code, Secure Web Applications

  • Full-Stack Development
  • Web Application Development
  • API Development
  • API Integration
  • REST API
  • Laravel
  • PHP
  • Node.js
  • JavaScript
  • React
  • Vue.js
  • Python
  • MySQL
  • Payment Gateway Integration
  • SaaS Development
Sohaib A.

Faisalabad, Pakistan

$20/hr
5.0
17 jobs

I help businesses build scalable web and mobile applications, fix critical issues, and integrate complex APIs that actually work in production. Whether your system is slow, broken, or not scaling — I can step in, fix it fast, and make it reliable. 💡 What I Do Best Build Laravel backend systems (APIs, SaaS, dashboards) Develop React & React Native applications with real-world integrations Fix urgent bugs, performance issues, and broken systems Handle deployment, servers, and scaling 🧱 Core Expertise 🔹 Backend Development (Primary Strength) Laravel, PHP, REST APIs Secure authentication & role systems Queue jobs, cron jobs, background processing Scalable SaaS architecture 🔹 Frontend & Mobile React.js (modern UI, dashboards) React Native (mobile apps with API integration) 🔹 E-commerce & CMS WordPress & WooCommerce customization Conversion-focused design Third-party integrations 🔹 DevOps & Deployment VPS setup (DigitalOcean, AWS) CI/CD pipelines NGINX / Apache configuration Docker environments 🔹 Performance Optimization Speed optimization & Core Web Vitals Database tuning & caching Cloudflare & CDN setups ⚡ What Makes Me Different I focus on real-world systems, not just code I understand business logic + performance, not just features I can jump into existing projects and fix issues quickly ⭐ Proven Track Record ⭐ 5.0 rating with satisfied clients Built and maintained API-heavy systems, SaaS platforms, and mobile apps Strong experience in debugging and scaling production systems 📩 Let’s Work If you need someone who can fix issues, build reliable systems, and deliver without wasting time, send me a message — I’m ready to start.

  • Laravel
  • Node.js
  • API Integration
  • RESTful API
  • React
  • OpenAI API
  • AI Implementation
  • PHP
  • MySQL
  • PostgreSQL
  • SaaS Development
  • Stripe
  • GraphQL
  • ERP Software
  • AWS CodeDeploy
  • Git
  • JavaScript
  • React Native
  • Software Architecture
  • Database

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