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$1M+ earned, 17,000+ hours, 𝐓𝐨𝐩 𝐑𝐚𝐭𝐞𝐝 𝐏𝐥𝐮𝐬 (top 3% on Upwork). I'm a full-stack engineer and software architect with 𝟏𝟗 𝐲𝐞𝐚𝐫𝐬 𝐨𝐟 𝐞𝐱𝐩𝐞𝐫𝐢𝐞𝐧𝐜𝐞. I build AI products, HealthTech platforms, real-time video systems, and SaaS, plus the cloud infrastructure that keeps them fast under real load. • 100% Job Success, 95 jobs completed • Top Rated Plus: top 3% of Upwork talent • 17,000+ hours worked, $1M+ earned • Excellent communication, verified by Upwork 𝐀𝐈 & 𝐋𝐋𝐌 𝐄𝐧𝐠𝐢𝐧𝐞𝐞𝐫𝐢𝐧𝐠 Production LLM apps: chat assistants, RAG pipelines, and AI agents built on OpenAI and Claude (Anthropic) APIs. Shipped work includes AI Mate and Genius (AI assistants) and TissueConnect.ai, an Azure-based medical imaging AI platform. 𝐇𝐞𝐚𝐥𝐭𝐡𝐓𝐞𝐜𝐡, 𝐅𝐇𝐈𝐑 & 𝐇𝐈𝐏𝐀𝐀 I implement HL7 FHIR for interoperable exchange of patient and clinical data with EHR systems, with HIPAA-compliant handling of protected health information end to end. On TissueConnect.ai I built FHIR integration into an Azure-based medical imaging AI platform. 𝐑𝐞𝐚𝐥-𝐓𝐢𝐦𝐞 𝐕𝐢𝐝𝐞𝐨 & 𝐖𝐞𝐛𝐑𝐓𝐂 Low-latency WebRTC is a core strength: telehealth consults, live classes, remote proctoring, and synchronized multi-party sessions. I built Daency, where every student in a class follows the same video in real time with their trainer. 𝐂𝐥𝐨𝐮𝐝, 𝐃𝐞𝐯𝐎𝐩𝐬 & 𝐋𝐨𝐚𝐝 𝐁𝐚𝐥𝐚𝐧𝐜𝐢𝐧𝐠 AWS (EC2, S3, Lambda, VPC, Route53, CloudFront, ALB/NLB), Azure, Google Cloud, DigitalOcean. Load balancing, auto-scaling, NGINX, Docker, CI/CD (GitHub Actions, Jenkins). I've run infrastructure for an SMS platform handling millions of texts a month, and high-stakes online exams that cannot go down. 𝐅𝐮𝐥𝐥 𝐒𝐭𝐚𝐜𝐤 & 𝐌𝐨𝐛𝐢𝐥𝐞 TypeScript, React, Next.js, Vue, Node.js. REST and GraphQL APIs backed by MongoDB, PostgreSQL, MySQL, and Redis. Mobile and desktop with Flutter, React Native, and Electron. 𝐀𝐫𝐜𝐡𝐢𝐭𝐞𝐜𝐭𝐮𝐫𝐞 𝐚𝐭 𝐒𝐜𝐚𝐥𝐞 Software architect for TestReach since 2014, an online assessment and remote proctoring platform used by leading certification bodies. Co-founder of NerdDevs (20+ engineers), so when your project needs more than one pair of hands, I can bring a vetted team. 𝐇𝐨𝐰 𝐈 𝐰𝐨𝐫𝐤 • I don't just write code. 𝐼 𝑠𝑜𝑙𝑣𝑒 𝑏𝑢𝑠𝑖𝑛𝑒𝑠𝑠 𝑝𝑟𝑜𝑏𝑙𝑒𝑚𝑠. • TDD and proven design patterns: reliable, maintainable, scalable. • Honest, clear communication. You'll always know where things stand. 𝐀 𝐠𝐨𝐨𝐝 𝐟𝐢𝐭 𝐢𝐟 𝐲𝐨𝐮'𝐫𝐞... An ambitious startup, a healthcare or EdTech company, or a business owner who needs a senior engineer to build an AI product, ship a compliant health platform, scale real-time video, or untangle infrastructure. 𝑇𝑒𝑙𝑙 𝑚𝑒 𝑤ℎ𝑎𝑡 𝑦𝑜𝑢'𝑟𝑒 𝑏𝑢𝑖𝑙𝑑𝑖𝑛𝑔 𝑎𝑛𝑑 𝑤ℎ𝑒𝑟𝑒 𝑖𝑡 ℎ𝑢𝑟𝑡𝑠, 𝑎𝑛𝑑 𝐼'𝑙𝑙 𝑡𝑒𝑙𝑙 𝑦𝑜𝑢 𝑒𝑥𝑎𝑐𝑡𝑙𝑦 ℎ𝑜𝑤 𝐼'𝑑 𝑎𝑝𝑝𝑟𝑜𝑎𝑐ℎ 𝑖𝑡.

Hi, I'm Opi, a Top-Rated Full Stack Developer with 6+ years of experience building custom web applications, SaaS platforms, AI-powered software, enterprise systems, and production-ready MVPs for startups, SMEs, and growing businesses. I help founders and companies transform ideas into secure, scalable, and maintainable software. Whether you need a new SaaS platform, an AI-powered application, an enterprise business system, or a custom web application, I can take your project from planning and architecture to deployment and long-term support. Services - Full Stack Development - Custom Software Development - Web Application Development - SaaS Application & MVP Development - AI Application Development - Enterprise Software Development - CRM, ERP, HRM & POS Systems - Warehouse Management Systems (WMS) - Admin Dashboards & Customer Portals - REST API Development & Third-Party Integrations - Payment Gateway Integration - Cloud Deployment & DevOps Tech Stack Frontend: React.js, Next.js, TypeScript, JavaScript, Tailwind CSS Backend: Node.js, Express.js, NestJS, Laravel, PHP, Python, FastAPI Database & Cloud: PostgreSQL, MySQL, MongoDB, Supabase, AWS, Docker, DigitalOcean, GitHub Actions (CI/CD) Why Work With Me - Top-Rated Freelancer on Upwork - 100% Job Success Score - 50+ Custom Software Products Delivered - Experience building AI, SaaS, ERP, CRM, WMS, HRM, and enterprise platforms - Clean, scalable, and maintainable code - Secure authentication, role-based access, and API-first architecture - Fast communication and transparent project management - 6 Months Free Maintenance After Delivery Whether you're looking for a Full Stack Developer, Web Application Developer, AI Developer, SaaS Developer, Enterprise Software Developer, or a Custom Software Engineer, I'm ready to help build software that's reliable, scalable, and designed for long-term success. Let's build something great together. Keywords: Full-Stack Developer, Full Stack Software Engineer, Custom Software Developer, Web Application Developer, SaaS Developer, SaaS MVP Developer, AI Developer, AI Engineer, AI SaaS Developer, Enterprise Software Developer, OpenAI API, ChatGPT Developer, GPT-4o, Claude AI, Gemini AI, AI Agent Developer, LLM Developer, RAG, LangChain, LangGraph, MCP, Vector Database, AI Automation, AI Integration, Prompt Engineering, React.js, Next.js, TypeScript, JavaScript, Tailwind CSS, Material UI, Bootstrap, React Native, Flutter, Node.js, NestJS, Laravel, PHP, Python, FastAPI, REST API, API Integration, PostgreSQL, MySQL, MongoDB, Supabase, AWS, Docker, DevOps, CRM Development, ERP Development, HRM Development, POS Development, Warehouse Management System (WMS), Inventory Management System, Marketplace Development, Multi-Tenant SaaS, Subscription Platform, Payment Gateway Integration, Admin Dashboard, Customer Portal, n8n, Zapier, Microsoft Power Automate, Healthcare, Telemedicine, Fintech, Logistics, Supply Chain, Education, LMS, Video Streaming, E-commerce.

I’m a Web & Mobile App Developer with 30+ mobile apps and 50+ web systems successfully delivered for startups, SMEs, and global businesses. I build fast, scalable, and user-focused mobile apps and web applications, from MVPs to full SaaS platforms, using modern technologies and clean, future-ready architecture. 🌐 𝗠𝗬 𝗪𝗘𝗕 𝗔𝗣𝗣 𝗗𝗘𝗩𝗘𝗟𝗢𝗣𝗠𝗘𝗡𝗧 𝗘𝗫𝗣𝗘𝗥𝗧𝗜𝗦𝗘 * Custom Web Applications (React, Next.js, Laravel, Node.js, Django, Go) * SaaS Platforms & Multi-Tenant Architecture (CRM, ERP, HRM, POS, Accounting) * Admin Dashboards & Role-Based Access Control * Secure REST/GraphQL API Development & Third-Party Integrations * Authentication (JWT, OAuth, Firebase Auth) * AI Integration (OpenAI, Gemini, Claude) 📱 𝗠𝗬 𝗠𝗢𝗕𝗜𝗟𝗘 𝗔𝗣𝗣 𝗗𝗘𝗩𝗘𝗟𝗢𝗣𝗠𝗘𝗡𝗧 𝗘𝗫𝗣𝗘𝗥𝗧𝗜𝗦𝗘 * Cross-platform apps with Flutter & React Native * Firebase / Supabase / Custom backend integrations * Real-time features: Chat, Notifications, Live Tracking * Stripe Payments, Subscriptions, Webhooks & Payment Gateways * Google Maps & Location-Based Features * iOS & Android Store Publishing + CI/CD ⚙️ 𝗧𝗛𝗘 𝗧𝗘𝗖𝗛𝗡𝗢𝗟𝗢𝗚𝗜𝗘𝗦 𝗕𝗘𝗛𝗜𝗡𝗗 𝗠𝗬 𝗦𝗢𝗟𝗨𝗧𝗜𝗢𝗡𝗦 Web: React, Next.js, Laravel, Node.js, Express, Django, Go Mobile app: Flutter, React Native Backend: PostgreSQL, MySQL, MongoDB, Firebase, Supabase Cloud: AWS, Docker, CI/CD, GitHub Actions Integrations: Stripe, Shopify, TikTok, Amazon SP-API, Payment Gateways, Maps, Sockets 𝗔 𝗚𝗟𝗜𝗠𝗣𝗦𝗘 𝗢𝗙 𝗧𝗛𝗘 𝗜𝗡𝗗𝗨𝗦𝗧𝗥𝗜𝗘𝗦 & 𝗔𝗣𝗣 𝗗𝗢𝗠𝗔𝗜𝗡𝗦 𝗜’𝗩𝗘 𝗪𝗢𝗥𝗞𝗘𝗗 𝗜𝗡 ✔️ AI-Powered Applications & Business Automation ✔️ Social Media & Community Platforms ✔️ E-commerce & Marketplace Applications ✔️ Finance, Accounting & Budget Management ✔️ Health, Fitness & Wellness Applications ✔️ Education & EdTech Platforms ✔️ On-Demand Service Applications ✔️ Food Delivery & Restaurant Applications with Real-Time Tracking ✔️ Payment, Subscription & Marketplace Applications ✔️ Productivity, Task & Workflow Management Applications ✔️ Travel, Hotel & Ticket Booking Applications ✔️ Real Estate & Property Listing Platforms ✔️ Sports, Events & Entertainment Applications ✔️ Video Streaming & Content Platforms ✔️ Grocery Shopping & Delivery Applications ✔️ Logistics & Supply Chain Applications ✔️ CRM, ERP, HRM & Business Management Systems ✔️ SaaS & Multi-Tenant Business Platforms ✔️ MVP Development for Startups & Growing Businesses ✔️ Client Portals & Internal Operations Platforms ⭐ 𝗪𝗛𝗬 𝗖𝗟𝗜𝗘𝗡𝗧𝗦 𝗖𝗛𝗢𝗢𝗦𝗘 𝗧𝗢 𝗪𝗢𝗥𝗞 𝗪𝗜𝗧𝗛 𝗠𝗘 ✔️ Business-focused solutions built around real operational needs ✔️ Clean, scalable & secure architecture designed for long-term growth ✔️ Production-ready, maintainable code ✔️ Clear communication & regular progress updates ✔️ Fast MVP delivery with a roadmap for future expansion ✔️ End-to-end support from development to deployment and ongoing maintenance ✔️ Trusted by 600+ businesses in 30+ countries 📩 𝗟𝗘𝗧’𝗦 𝗕𝗨𝗜𝗟𝗗 𝗬𝗢𝗨𝗥 𝗡𝗘𝗫𝗧 𝗦𝗢𝗙𝗧𝗪𝗔𝗥𝗘 𝗣𝗥𝗢𝗗𝗨𝗖𝗧 Whether you’re building an MVP, AI SaaS platform, ERP, CRM, client portal, business application, or mobile app, I can help turn your idea into a reliable, production-ready product. Send me a message and let’s bring your idea to life.

Need a reliable developer who can build your product and bring in the right technical specialists when needed? I’m Wasiul, a Full-Stack Web and Mobile Developer and COO at Workspace Infotech Ltd. I work directly with clients to understand their requirements, recommend practical software solutions and contribute throughout development and delivery. For larger or multi-skill projects, I collaborate with our experienced in-house developers, UI/UX designers, QA engineers, DevOps specialists and AI professionals. You will communicate directly with me while gaining the development capacity and technical support of a complete software team. Quick Overview ✔ Delivered 20+ projects across web and mobile platforms, helping businesses optimize operations and scale efficiently. ✔ Built dynamic web apps using ReactJS, NodeJS, Python, and PHP/Laravel with smooth, responsive user experiences. ✔ Developed cross-platform mobile apps with Flutter, ensuring native-like performance and seamless design. ✔ Integrated secure APIs and scalable databases, delivering reliable systems to support thousands of active users. Industry Experience E-commerce: Payment integrations, inventory management, and customer portals. Healthcare: Appointment scheduling, telemedicine apps, HIPAA-ready systems. Fintech: Transaction platforms, reporting dashboards, secure authentication. Education & eLearning: LMS platforms, online exams, interactive learning apps. Logistics & Supply Chain: Real-time tracking, route optimization, fleet management. Travel & Hospitality: Custom booking engines, travel management tools, mobile-first platforms. Business Automation: ERP, CRM, SaaS solutions for process optimization. Skills & Technologies Backend: Python, NodeJS, PHP, Laravel Frontend: ReactJS, JavaScript, modern UI libraries Mobile: Flutter (cross-platform apps with native-like performance) Databases: MySQL, PostgreSQL, MongoDB Design & Prototyping: Figma (we also share Figma prototypes with clients) Version Control & Deployment: Git, GitHub, GitLab, Docker, CI/CD pipelines We work with businesses to turn ideas into practical digital products—whether it’s a customer-facing app, a backend system, or a complete SaaS solution. 💡 7-DAY FREE TRIAL – You can start working with our team risk-free. Test our capabilities with real tasks before committing long-term. Keywords to Find Us: Full-Stack Development, Python Developer, ReactJS Developer, NodeJS Developer, PHP Laravel Developer, Flutter Developer, JavaScript, SaaS, ERP, CRM, Web Applications, Mobile Applications, Cross-Platform Development, API Development, API Integration, REST API, SQL, PostgreSQL, MySQL, MongoDB, Docker, Git, GitHub, GitLab, CI/CD, Cloud Deployment, Figma, UI/UX, Business Automation, E-commerce Development, Fintech Platforms, Healthcare Apps, TravelTech, Logistics Systems, EdTech Solutions.