Sajjad S.

AI Integration & Full-Stack Developer | OpenAI, AI Agents, Automation

I build production AI systems end-to-end—from AI agents, RAG, voice automation, and intelligent workflows to secure SaaS interfaces, APIs, databases, and cloud deployment. I’m an Upwork Top Rated Plus Full-Stack Developer with 10+ years of experience building web applications, SaaS platforms, AI integrations, automation systems, e-commerce solutions, and custom business software. My strength is connecting modern AI capabilities with dependable full-stack engineering. I can take your project from requirements and architecture through development, integration, testing, deployment, and ongoing support. I also use AI-native development tools to accelerate research, implementation, debugging, testing, and documentation. Every architecture decision and production change remains human-reviewed, security-conscious, and test-backed. 🤖 AI Systems, Generative AI & Automation • AI agents and agentic workflows with tool calling, memory, multi-step reasoning, and human handoff • Generative AI applications using OpenAI, Anthropic Claude, Google Gemini, and other LLM APIs • RAG, embeddings, vector databases, semantic search, and enterprise knowledge assistants • MCP integrations, structured outputs, prompt engineering, evaluations, guardrails, and fallback handling • AI chatbots and Vapi voice assistants for support, lead qualification, booking, and communications • n8n, Zapier, Make, and GoHighLevel automation connected with CRMs, Google Sheets, Slack, Monday, Asana, ClickUp, and external APIs 💻 Full-Stack Web, SaaS & E-Commerce Development • SaaS products, MVPs, enterprise applications, customer portals, admin dashboards, marketplaces, job boards, real-time applications, and booking systems • Next.js, React, TypeScript, JavaScript, and Node.js • TALL, MERN, LAMP, .NET, Python, and C# development • Firebase, Firestore, Cloud Functions, AWS RDS, SQL Server, MySQL, MongoDB, Supabase and third-party APIs • WordPress, WooCommerce, custom themes and plugins, Shopify, Stripe, PayPal, cryptocurrency, and payment integrations • Web scraping, browser automation, crawlers, and data processing using Playwright, Selenium, Scrapy, Python, and C# 🛡️ Production Engineering & Reliability • Secure APIs, authentication, role-based authorization, data validation, and safe third-party integrations • Background jobs, webhooks, retries, monitoring, structured logging, AI cost controls, and failure recovery • Maintainable architecture, automated testing, performance optimization, and production-focused code review • End-to-end ownership with clear communication, realistic estimates, dependable delivery, and post-launch support Recent production work includes multi-stage AI pipelines for content generation, evaluation, scoring, rewriting, personalization, and external API synchronization—along with secure SaaS dashboards featuring session-based authentication, analytics, and role-aware data access. 🏆 Why Clients Choose Me • Upwork Top Rated Plus Freelancer • 10+ years of full-stack development experience • Consistent 5-star client feedback • Experience across both modern AI systems and established web platforms • A practical, business-focused approach to solving complex technical problems 🚀 Ready to Build a Production-Ready AI or Full-Stack Solution? Whether you need an AI agent, RAG application, voice assistant, automated business workflow, SaaS platform, API integration, or high-performing e-commerce website, I can help you move from idea to production. Send me a message or invite me to your project. I’ll review your requirements, identify the right technical approach, and recommend the most practical next step. Let’s build a reliable solution that saves time, reduces manual work, and creates measurable value for your business. 🏆 Reviews and feedback from high-profile clients 🏆 ⭐⭐⭐⭐⭐ "Sajjad's attention to detail and dedication to delivering top-notch results were truly commendable. It was a pleasure working with someone who is not only skilled but also genuinely passionate about their work." ⭐⭐⭐⭐⭐"Recommended! Sajjad helped us with one of our company's websites. We are glad that we've found a WordPress expert like Sajjad and we're looking forward to working on more projects for us and the clients of our agency in the future" ⭐⭐⭐⭐⭐ "Sajjad is working for me since 2020, and he is a mind-blowing freelancer with a great skill set. He is developing Amazon scraping tools and web development projects for me. He puts all his efforts into fulfilling the my requirements into project, even if a new challenge arises, he is a quick learner. I would always choose him for my services for decades. We are closing this contract to open a new one!"