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Senior Full Stack Developer with 15+ years of experience building SaaS platforms, business applications, payment systems, AI-powered tools, and high-traffic web applications. I help startups and established businesses design, build, scale, and maintain software products from MVP to production. Recent focus areas include: • SaaS Platform Development • AI Integrations (OpenAI, Claude, AI Workflows) • Laravel Applications • Next.js Applications • API Development & Integrations • Stripe & Subscription Billing • Automation Systems • Multi-Tenant Platforms • CRM & Business Operations Software • Marketplace Platforms • Payment Processing Systems Over the years I have worked on: ✓ Large-scale SaaS products ✓ Payment and subscription systems ✓ High-volume API platforms ✓ Business automation systems ✓ Customer portals ✓ Marketplace applications ✓ CRM and workflow platforms ✓ WordPress and WooCommerce solutions Core Technologies: Backend: Laravel, PHP, Node.js, Express.js, MySQL, PostgreSQL, MongoDB, Redis Frontend: React, Next.js, JavaScript, TypeScript Cloud & Infrastructure: AWS, Docker, CI/CD, Linux, Nginx AI & Automation: OpenAI, Claude, AI Workflows, API Integrations, Business Process Automation What clients typically hire me for: • Building SaaS products from scratch • Scaling existing applications • AI feature integration • Stripe subscriptions and payment systems • API architecture and integrations • Performance optimization • Complex debugging and problem solving • Long-term product development 150+ completed projects, 22,000+ Upwork hours, and a 100% Job Success Score. If you need a senior engineer who can understand both the technical and business side of a product, let’s discuss your project.

I help startups and growing businesses build reliable 𝐒𝐚𝐚𝐬 𝐩𝐫𝐨𝐝𝐮𝐜𝐭𝐬, 𝐏𝐚𝐲𝐦𝐞𝐧𝐭 𝐬𝐲𝐬𝐭𝐞𝐦𝐬, and 𝐀𝐈-𝐩𝐨𝐰𝐞𝐫𝐞𝐝 𝐰𝐨𝐫𝐤𝐟𝐥𝐨𝐰𝐬 that are production-ready. 𝐈’𝐦 𝐚 𝐒𝐞𝐧𝐢𝐨𝐫 𝐅𝐮𝐥𝐥-𝐒𝐭𝐚𝐜𝐤 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫(𝒲ℯ𝒷&ℳℴ𝒷𝒾𝓁ℯ) 𝐚𝐧𝐝 𝐒𝐭𝐫𝐢𝐩𝐞/𝐏𝐚𝐲𝐦𝐞𝐧𝐭𝐬 𝐒𝐩𝐞𝐜𝐢𝐚𝐥𝐢𝐬𝐭 𝐰𝐢𝐭𝐡 $𝟏𝟓𝟎𝐤+ 𝐞𝐚𝐫𝐧𝐞𝐝 𝐨𝐧 𝐔𝐩𝐰𝐨𝐫𝐤 𝐚𝐧𝐝 𝟏𝟓𝟎+ 𝐬𝐮𝐜𝐜𝐞𝐬𝐬𝐟𝐮𝐥𝐥𝐲 𝐝𝐞𝐥𝐢𝐯𝐞𝐫𝐞𝐝 𝐩𝐫𝐨𝐣𝐞𝐜𝐭𝐬, 𝐢𝐧𝐜𝐥𝐮𝐝𝐢𝐧𝐠 𝐩𝐥𝐚𝐭𝐟𝐨𝐫𝐦𝐬 𝐩𝐫𝐨𝐜𝐞𝐬𝐬𝐢𝐧𝐠 𝐦𝐢𝐥𝐥𝐢𝐨𝐧𝐬 𝐢𝐧 𝐚𝐧𝐧𝐮𝐚𝐥 𝐫𝐞𝐯𝐞𝐧𝐮𝐞. ❇️ I focus on outcomes that matter: 🔹Higher checkout conversion 🔹Fewer payment failures 🔹Faster product launches 🔹Secure, scalable architecture ❇️Why clients hire me: 🔹Clean, reliable implementation 🔹Clear communication and on-time delivery 🔹Strong ownership from planning to production 𝐑𝐞𝐜𝐞𝐧𝐭 𝐜𝐥𝐢𝐞𝐧𝐭 𝐟𝐞𝐞𝐝𝐛𝐚𝐜𝐤 (𝟓 star): “Saidur is an excellent developer who goes above and beyond to get the job done. I recommend Saidur for any work you need done. 5 Stars from Me.” “I’m bringing Saidur back for the Google Cloud setup because his work quality is consistently high... clean, secure implementations... confident in the outcome.” ❇️ Core expertise: 🔹Full-stack web and mobile development 🔹SaaS platforms (multi-tenant, RBAC, subscriptions, billing) 🔹Stripe integrations (Checkout, Subscriptions, Connect, Webhooks, Invoicing, Tax, Payouts, SCA/3DS, ACH, SEPA, Apple Pay, Google Pay) 🔹Payment migrations (between Stripe accounts or from other gateways) 🔹AI features (OpenAI/ChatGPT, RAG, function calling, agentic workflows, AI automation) 🔹API development and integrations (REST, webhook-driven systems) 🔹MVP development (rapid build to production-ready architecture) ❇️ AI/LLM capabilities: 🔹Prompt design and tool/function workflows 🔹RAG pipelines (embeddings, vector search, reranking) 🔹AI + rule-engine hybrid systems 🔹Deployment patterns (queues, workers, caching, monitoring) ❇️ Tech stack: 𝐁𝐚𝐜𝐤𝐞𝐧𝐝: Node.js, Python, Next.js, NestJS, Laravel, CodeIgniter, CakePHP, WordPress, Java, MySQL, MongoDB, Supabase 𝐅𝐫𝐨𝐧𝐭𝐞𝐧𝐝: React, Next.js, React Native, Vue, TypeScript, Tailwind CSS 𝐃𝐞𝐯𝐎𝐩𝐬/𝐂𝐥𝐨𝐮𝐝: Docker, Kubernetes, Nginx, AWS, GCP (Cloud Run, Cloud SQL), Terraform, Ansible, Jenkins, Grafana, CI/CD automation, infrastructure as code (IaC), load balancing, CDN, monitoring, logging, and observability. 𝐈𝐧𝐭𝐞𝐠𝐫𝐚𝐭𝐢𝐨𝐧𝐬: Stripe, PayPal, WorldPay, Plaid, Mollie, Scalapay, Zapier, Pabbly, QuickBooks, FreshBooks, Pipedrive, Mailchimp, Facebook Pixel, Google Analytics, and many more. If you need a developer who can build, fix, and scale your product with quality and speed, send me a message with your goals and timeline. I can start with a quick technical assessment and clear implementation plan. Thanks, Saidur Rohman

I help businesses automate repetitive processes, improve customer support, capture more leads, and connect their existing systems using AI, n8n, OpenAI, WhatsApp, APIs, Laravel, and WordPress. As an AI Automation Engineer and Full-Stack Developer, I build reliable automation systems that connect websites, CRM platforms, email, WhatsApp, payment gateways, databases, and third-party applications. What I Can Help You Automate ✔ AI-powered customer support and chatbots ✔ WhatsApp lead qualification and follow-up ✔ Appointment booking and reminder workflows ✔ CRM lead capture, routing, and synchronization ✔ Email processing and document automation ✔ OpenAI, ChatGPT, Claude, and Gemini integrations ✔ n8n workflows, webhooks, and API connections ✔ Payment, invoice, and notification automation ✔ Internal business processes and reporting workflows Custom Development and Integration When no-code tools are not enough, my team can build the required custom functionality using: PHP and Laravel WordPress custom development REST APIs and webhooks MySQL and database optimization SaaS platforms and admin dashboards Custom plugins and backend systems Payment gateways and third-party integrations Flutter mobile applications I can work with your existing system or develop a complete solution from the ground up—from workflow planning and API integration to testing, deployment, and ongoing maintenance. Typical Projects n8n AI automation workflows AI chatbots with human-agent handover WhatsApp Business API automation Lead-to-CRM automation AI email and attachment processing Custom Laravel SaaS applications WordPress API and plugin development OpenAI integration into existing software Booking, payment, and follow-up automation Fixing and productionizing AI-generated applications Why Work With Me? ✔ 5+ years of development experience ✔ Upwork Top Rated freelancer ✔ Experience with complex SaaS and automation systems ✔ Clean, scalable, and maintainable development ✔ Clear communication and milestone-based delivery ✔ Complete support from planning to deployment My goal is not just to create an automation or chatbot. I build complete, dependable systems that save time, reduce manual work, and support long-term business growth. Send me a message with your current process, the tools you use, and what you would like to automate. I will recommend the most practical solution. Best regards, Md Rony

I’m a senior full-stack engineer with 18+ years of professional development experience, specializing in building AI-powered web applications, intelligent automation systems, and scalable backend architectures. Recently, I’ve been working extensively on AI-driven platforms, including a long-term Upwork project titled: AI-Powered Property Data Prefill & Chatbot Development (Angular, Tailwind, Node.js, FastAPI, PyTorch, MySQL) In this project I built production features such as: • AI chatbots for real-estate workflows • automated property data extraction and prefilling • backend AI pipelines using FastAPI and Python • frontend interfaces using Angular and TailwindCSS • integration with ML models using PyTorch • scalable APIs and data pipelines This project alone has 1500+ hours of development and is still ongoing, demonstrating long-term client trust. My current specialization: • AI / LLM Systems • RAG (Retrieval Augmented Generation) • AI chatbots and assistants • Document AI and knowledge systems • Vector search and semantic retrieval • FastAPI AI services Modern Backend: Python / FastAPI, Node.js, Laravel, Scalable API architecture, Microservices Frontend; Angular, React, Vue, TailwindCSS Databases: PostgreSQL, MySQL, Vector databases / FAISS

I help startups, agencies, and businesses build secure, scalable, and high-performance web applications using modern technologies and AI-assisted development workflows. With strong experience in backend engineering, API development, cloud infrastructure, and frontend frameworks, I deliver clean, maintainable solutions that are fast, reliable, and production-ready. What I Can Help You With ✅ Custom Web Application Development ✅ REST API & GraphQL Development ✅ SaaS Platforms & Business Systems ✅ AI-Assisted Development & Automation ✅ Third-Party API Integrations ✅ Performance Optimization & Security Hardening ✅ Legacy System Upgrade & Modernization ✅ Cloud Deployment & DevOps Setup Backend & Web Technologies • Laravel, Django, Spring Boot, Yii2 • Express.js, NestJS • WordPress, Drupal, Magento • PHP, Python, Java, JavaScript, TypeScript • MySQL, PostgreSQL, MongoDB, Redis Frontend Development • React.js, Vue.js • Tailwind CSS, Bootstrap • Alpine.js, Livewire, HTMX Cloud & DevOps • AWS, GCP • Docker, Kubernetes • CI/CD Pipelines • Linux, Nginx, Apache API & Integrations • Stripe, PayPal • Twilio, Firebase • Slack, Zapier, Xero • REST APIs & GraphQL AI Development Workflow I actively use modern AI development tools to improve delivery speed, code quality, debugging, and architecture planning: • Cursor • Claude • ChatGPT • GitHub Copilot Why Clients Work With Me ✔ Clean, maintainable, scalable code ✔ Fast communication & reliable delivery ✔ Strong debugging and problem-solving skills ✔ Production-ready deployment experience ✔ Security-focused development approach ✔ Ability to work independently and take ownership Whether you need a custom platform, backend API, cloud deployment, or ongoing development support, I can help turn your ideas into reliable software solutions. Let’s build something great together.

$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, SaaS platforms, and 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 — avg. response 0–4 hours 🤖 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. ☁️ 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, growing SaaS company, or business owner who needs a senior engineer to build an AI product, scale a platform, or untangle infrastructure. Tell me what you're building and where it hurts — I'll tell you exactly how I'd approach it.