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I can solve any custom API integration issue that other developers have given up on - from phone door openers to Swiss and American banks, from 1974's nacha technologies to artificial intelligence, crypto and blockchain. I have 22+ years of overall 🌐 Web Development experience, including 18+ years with ⚙️ Custom PHP, 16+ years with 📝 WordPress and 🛠️ API Integration, and 12+ years with 🛍️ eCommerce, along with other related technologies and programming languages. Located in Washington State, I have no problem working 30-40+ hours during American time. I am self-controlled, self-organized, flexible and learnable, I can adapt to whatever your project requires. ================================ 🛠️ API INTEGRATION I offer custom API integration for a wide range of services using the most common REST, SOAP and GraphQL protocols. There is a strong focus on authentication, error handling and personal data security. I have extensive experience working with 1,200,000+ records at a time with regular automatic updates down to the minute. 🛠️ API integration development 🛠️ Data transformation and processing 🛠️ Analytics, reporting and visualization 🛠️ Custom API/feeds development Some API integrations I have experience with: Ahrefs API, Amazon API Gateway, Amazon AWS API, Amazon Lambda API, Amazon PA API, Amazon S3 API, Bank Of America API, Barcode Lookup API, BigCommerce API, BlueBanc API, Brevo API, Bright Data API, ChatGPT API, Cloudflare API, CoinBase API, Detroit Trading API, Dukascopy API, Dynadot API, eBay Product API, Envato API, Ethereum API, Etherscan API, First Data API, Fiserv API, GoDaddy API, Google Places API, HubSpot API, Jobber API, Lead Byte API, Lead Galore API, Lead Horizon API, Lead Prosper API, Leads Hook API, MaxMind API, Meta Marketing API, Modern Dropship API, NameSilo API, NowPayments API, OpenAI API, PayPal API, Plaid API, Polygon API, Polygon Scan API, Quin Stage API, Quin Street API, Relograde API, RiskPay API, Round Sky API, Samsara API, Seamless Chex API, SendGrid API, Shopify API, Slack API, Square API, Stripe API, Supabase API, Tatum API, Thumbtack API, Trulia API, Twilio API, VideoHive API, WhatsApp Cloud API, WooCommerce API, WordPress API, Zillow API, etc... ================================ 🧠 DATA PROCESSING I offer ETL (Extract, Transform, Load) data processing services that include cleaning, transforming, and analyzing data to extract valuable insights. This can involve working with external APIs, large datasets, cloud or database storage. I have extensive experience with tools like PHP, databases and cloud services for efficient processing. 🧠 Data cleaning and transformation 🧠 Real-time data analysis and reporting 🧠 Data files creating and processing 🧠 Artificial intelligence enhancing ================================ ⚙️ MICROSERVICES I offer development of microservices for external project management or communication between different projects. This includes receiving data via API, converting it to the required format, storing it in a database or sending it via API to another service. I have experience working with Amazon, Google, Meta as well as smaller private services. ⚙️ Inbound and outbound API integration ⚙️ Converting one type of API to another type ⚙️ Splitting large queries into multiple queries ⚙️ Automatic processing of requests on schedule ================================ 🛍️ ECOMMERCE I offer product import/export and inventory management for eCommerce stores. This includes working with popular WordPress, Shopify, WooCommerce and BigCommerce as well as external marketplaces such as Amazon, eBay, Google Shopping, etc. I have extensive experience working with 100,000+ inventory processing and synchronization. 🛍️ Inventory management solutions 🛍️ Sales and performance analytics 🛍️ Fraud detection and prevention 🛍️ Marketplaces synchronization ================================ One last thing... there's a reason I have a 100% success score on Upwork. That's because I get it right the first time, or I will work for free until you're happy. Thank you for taking the time to review my profile. Looking forward to connecting with you!

Senior Full-Stack Developer with 13+ years of experience building scalable, secure, and high-performance software for enterprises and fast-moving startups. I specialize in backend-heavy systems, cloud architecture, and complex integrations where reliability, performance, and clean design matter. I have delivered production systems for global organizations including the United Nations, enterprise platforms, and SaaS startups across AI, finance, identity, telecom, and e-commerce. 🚀 Proven Impact • Built large-scale linguistic platforms for the United Nations used by translators and editors worldwide • Created an Azure Marketplace Managed Application that automates employee lifecycle management by syncing ADP data to Microsoft Entra ID • Developed high-volume APIs, SDKs, and webhook systems used across multiple regions • Delivered complex OAuth, SSO, payment, VOIP, and third-party integrations • Improved performance, scalability, and reliability of existing systems under real production load 🧠 Core Strengths • Backend Engineering, .NET, Node.js, Python, Go • API Design, REST, GraphQL, SOAP, OAuth, Webhooks, Microservices • Cloud & DevOps, Azure, AWS, GCP, Docker, Kubernetes, CI/CD • Databases, SQL Server, PostgreSQL, MySQL, MongoDB • Enterprise Integrations, Identity, Automation, AI-powered workflows 💼 How I Work • Strong ownership mindset, I treat your product like my own • Clear communication, proactive updates, no surprises • Production-ready code with long-term maintainability in mind • Comfortable working independently or with distributed teams If you need a senior engineer who can take complex requirements and turn them into stable, scalable solutions, I am ready to help. Let’s build something solid.

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.

Full Stack Developer | Laravel | PHP | APIs | AI Automation I help startups, businesses, and SaaS companies build modern web applications, automation systems, AI integrations, and scalable backend solutions. I work with Laravel, PHP, JavaScript, Node.js, Python, APIs, Chrome extensions, and AI-powered applications. I can help you with: * Custom web application development * Laravel and PHP backend systems * REST API and third-party integrations * AI chatbot and automation solutions * Chrome extension development * SaaS platforms and dashboards * Ecommerce websites and payment gateways * Automation tools and web scrapers * Mobile app support and integrations Why work with me: * Clean, scalable, and secure code * Fast communication and regular updates * Reliable long-term support * Experience with startups and growing businesses * Focused on performance and user experience Technical Skills: Laravel, PHP, JavaScript, Node.js, Python, MySQL, MongoDB, React.js, Vue.js, Tailwind CSS, OpenAI, ChatGPT, Gemini, Stripe, Twilio, REST APIs, Flutter, Android, iOS Looking forward to working with you. Sanjay Kumar Full Stack Developer | Software Engineer

🚀 Remote Shopware 6 Developer | 9+ Years of Experience | Certified & Top Rated Plus on Upwork I help eCommerce businesses — especially across Germany, Austria, and Switzerland — build fast, scalable, and reliable Shopware solutions that convert visitors into customers. With over 9 years of hands-on experience, I specialize in: 🔹 Custom Shopware plugin development (Shopware 5 & 6) 🔹 Store migrations (Shopware 5 → Shopware 6) 🔹 Theme development & UI customization 🔹 API integrations with ERP, CRM, payment & shipping systems 🔹 Performance optimization, SEO, and Core Web Vitals 🔹 Full-stack development using PHP, Symfony, JavaScript, Vue.js Whether you're an agency or a growing brand, I work as a remote Shopware freelancer who speaks your tech language — and delivers production-ready code. ✅ CET time zone ✅ Strong communication ✅ Long-term collaboration focus ✅ Certified and Top Rated Plus on Upwork --- 💬 Let’s build something powerful together. 📩 Feel free to connect or message me if you're hiring for a Shopware project, or need a reliable freelance developer on your team.

🌟 Expert-Vetted Talent - Recognized in Upwork's top 1% of Talent ✅ Established Track Record of Hours and Earnings 🚀 Fastest Response Times 💯 100% Job Success Awarded by Clients 🔝 Top Rated Plus by Upwork, Freelancer and Agency 🔎 Searching for New Opportunities and Problems to Solve Hello and welcome, thank you for considering me for your project. My Upwork profile’s stats clearly demonstrate both my expertise and the value I add to every team that brings me on. The thousands of hours clocked on this platform alone speak to my years of experience in Software Development, and the total earnings shows a glimpse of how valuable that time has been for clients. I am available and ready to answer specific questions about your project’s current problem, next opportunity, or my fit for it. Shall we get to work? Send a message or an invite now and I will be right with you. 𝐖𝐡𝐲 𝗖𝗹𝗶𝗲𝗻𝘁’𝘀 𝐂𝐡𝐨𝐨𝐬𝐞 𝐌𝐞: 1. 𝗘𝘅𝗽𝗲𝗿𝗶𝗲𝗻𝗰𝗲 𝗮𝗻𝗱 𝐄𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞: Decades of experience bring a deep understanding of various languages, frameworks, platforms and tools, common and uncommon pitfalls, and alternative solutions. 🗯️ “He was very responsive to our messages and explained what was needed in our project clearly. He is definitely an expert in his work.” 2. 𝗘𝗳𝗳𝗲𝗰𝘁𝗶𝘃𝗲 𝗣𝗿𝗼𝗯𝗹𝗲𝗺 𝗦𝗼𝗹𝘃𝗶𝗻𝗴: I have a proven track record and knack for solving complex problems and providing customized solutions for specific business needs and challenges. 💭 “Isaac was able to quickly discern what I needed and delivered…” 3. 𝗦𝘆𝘀𝘁𝗲𝗺 𝗩𝗶𝗲𝘄 𝗮𝗻𝗱 𝗖𝗼𝗺𝗽𝗿𝗲𝗵𝗲𝗻𝘀𝗶𝗼𝗻: Years of experience and diverse projects have helped me accumulate a broad set of skills and tools. I use this experience to the advantage of my client’s projects in not only accomplishing tasks, but in advising and consulting on potential challenges and opportunities. 💬 “LIFE SAVER!!! I have now use(d) Issac for two separate jobs now and will be bringing him on for some regular hours. Hopefully we get some funding and I can do even more with him. GREAT DEVELOPER” 𝐌𝐲 𝐂𝐨𝐫𝐞 𝐄𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞: Python|Django|PHP | MySQL | Laravel | WordPress | CodeIgniter | ExpressionEngine | CSS | HTML | JavaScript | Express.js | React.js | Bootstrap | PostgreSQL | NoSQL | Linux | Apache | Nginx | API | Git | SVN | Amazon Web Services | AWS EC2 | 𝐒𝐞𝐫𝐯𝐢𝐜𝐞𝐬 𝗜 𝐎𝐟𝐟𝐞𝐫: 𝐅𝐫𝐨𝐧𝐭 𝐚𝐧𝐝 𝐁𝐚𝐜𝐤-𝐄𝐧𝐝 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭: Planning, Design, Documentation, Coding, Testing, Debugging, Deployment, Monitoring, and Maintenance. 𝐒𝐲𝐬𝐭𝐞𝐦 𝐀𝐝𝐦𝐢𝐧𝐢𝐬𝐭𝐫𝐚𝐭𝐢𝐨𝐧: Cloud infrastructure Design, Deployment, Optimization, Maintenance, Scaling, Recovery and Backup, Troubleshooting, and Cost Management. 𝐃𝐚𝐭𝐚𝐛𝐚𝐬𝐞 Management: Architecting, Optimization, Monitoring, Recovery, Updating, and Merging. 𝐏𝐫𝐨𝐣𝐞𝐜𝐭 𝐌𝐚𝐧𝐚𝐠𝐞𝐦𝐞𝐧𝐭: Planning, Project Requirements, Task Detailing, Developer Support and Feedback, Problem Resolution, Progress Monitoring, Qualification Testing, and Stakeholder Communication.