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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

⏳ Saved founders and users 1000+ hours through fast-loading apps and reliable AI integrations across 7+ SaaSes. 30% discounted prices: because summer is a slow season for programming, you can work with me at a discount. For now... 🔧 I am best at making complex DB queries fast and AI integrations and agents that strike the balance between speed and reliability. 🎖️Top-rated Backend Developer with 7 years of experience. 🫡 WHY ME: I like to help you solve your technical challenges by marrying them to business outcomes. Where most developers exist in a bubble of just writing code, I'd also like to implement solutions that would help you succeed. What you'll get: ✅ Jargon-free, NO BS, no-nonsense communication style. Talking the technical to the non-technical. ✅ Zero micro-management: I can think, plan, and propose solutions on my own, yet your input is much welcomed. Your time is better spent marketing or managing the business. ✅ Fluent English Freelancer who communicates ideas in a way that makes business sense 🙌 Industries worked with: Marketplace Style Apps(Jobs, Real Estate, etc), EdTech, FinTech, Integrations 📚 STACK: As a backend developer, I specialize in Node.js, TypeScript, MongoDB, a bit of SQL too, where needed, Trpc, and a bit of Express when needed, Zod, a bit of Next.js and React where needed, Nginx, and Digital Ocean, and a bit of AWS/GCP when needed 💯. 💪🏼 EXTRA EXTRA :) Here are more specific things I'm good at: 📌 Complex MongoDB aggregations designed for querying large amounts of data in a fast way 📌 Making MongoDB typesafe and integrating it with TypeScript and Zod 📌 Experience with nginx, DNS servers & Virtualmin 📌 Web sockets, monorepos - integrated one DB with 2 backends: the main app and our internal dashboard 📌 AI Backend integrations - utilized AI in the backend for data generation & transformation 📌 Experienced with web scraping and external rest api’s 📌 Familiarity with security vulnerabilities such as CSRF, brute force, SQL injections, etc. 📌 Experience with stronger than JWT encryption systems, such as Passetto 📌 Database Migrations: SQL to SQL or SQL to MongoDB 🏁PPS: For examples of my work, make sure to see my portfolio or my intro video, which go into much more detail 📥 JUST MESSAGE ME: Now that you're convinced I'm good at this backend thingy, shoot me a message to start working together 🤝

I've saved companies over $120K every year on manual work and built multiple SaaS platforms from ground to a combined $110K ARR. If your team is wasting hours moving data between tools, your automations break the second an app updates, and you're hitting the limits of basic no-code setups, I'm the guy who fixes it. Send me an invite or a message and I'll send you a personalized Loom audit of your workflow within 24 hours. Just honest observations, no pitch, completely free. A little more about me: I help businesses scale by combining full stack engineering with AI workflows and automation. I don't just link two apps together with basic tools that break next week. I build solid, reliable infrastructure with proper documentation. I've deployed 49 completed projects, writing the actual APIs, databases, and custom backend code behind the automation so the systems keep running when someone changes a field name at 2 AM. I'm a Microsoft Certified AI Engineer (AI-102) and an Upwork Top Rated Developer. You can't fake that status. It's earned through keeping a flawless 100% Job Success Score across dozens of live systems, project after project. - $120K+ in annual operational savings generated for businesses by replacing manual tasks - $110K ARR generated across multiple live B2B and B2C SaaS platforms I engineered from MVP to production - 49 completed projects with a perfect 100% Job Success Score - Deployed autonomous AI Agents to automate lead qualification and customer calls - I build the custom backend infrastructure behind your workflows too, using NestJS, Node.js, FastAPI, and Golang to connect systems beyond no-code limits If you want someone who will look deep into your tech stack, fix your broken workflows, and build full stack AI automation that actually lasts, send me an invite and let's have a little chit-chat. EXPERTISE Full Stack AI Engineer | AI Integration | AI Automation | Business Process Automation | AI Agent Development | Lead Generation Automation | CRM Automation | SaaS Automation AI & LLM DEVELOPMENT OpenAI API | Claude API | Gemini API | MCP (Model Context Protocol) | LangChain | LangGraph | RAG Systems | Knowledge Base Chatbots | Document Processing | Lovable | Claude Code | Hermes Agents WORKFLOW PLATFORMS n8n Expert | Self-Hosted n8n | Make Expert | Zapier Expert | Pipedream Development BUSINESS SYSTEMS & INTEGRATIONS Airtable Expert | Google Sheets Automation | Notion | HubSpot Integration | GoHighLevel | Pipedrive | ClickUp | BotPress | Slack | WhatsApp AI Agents BACKEND & FULL STACK Backend Development | Full Stack Development | SaaS Development | AI SaaS Development | API & Webhook Integration | NestJS | Node.js | FastAPI | PostgreSQL | MongoDB | Golang | Microservices

I build Flutter apps people actually depend on. The Courier App runs 6,000+ UK drivers on code I shipped, and Calcount has 1,000+ users in Australia. 100% Job Success, Top Rated, and I get apps through App Store review on the first try. 🚀 I go deepest on the parts most devs avoid; real-time, payments, hardware; here's the full kit: 📹 Video Calling: Agora, Zego, VideoSDK.live, Jitsi, WebRTC 📞 VoIP: SIP calling and real-time communication 📡 BLE: ESP32-WROOM-32D, Nordic nRF52840, Adafruit Bluefruit nRF52, Keil 💳 Payments: Stripe, In-App Purchases, RevenueCat ☁️ AWS: EC2, CloudFront, S3, Route53, SNS, SES, MediaConvert ⚡ Supabase: Edge Functions, Auth, Realtime, the full stack 🔥 Firebase: Cloud Functions, Cloud Console, Firestore, FCM, Analytics 🗺️ Maps: Google Maps, Mapbox, OpenStreetMap, live tracking, geofencing, navigation 🎬 Media: FFMPEG, HLS streaming, AWS MediaConvert 🤖 AI: OpenAI, Gemini, Claude, YouTube Transcript APIs 🔐 Auth: Email/Password, Phone OTP, Google, Apple Sign-In 💬 Realtime Chat: SocketIO, WebSockets, Google gRPC Protocol Buffers 🗄️ Backend: Node.js, NestJS, Laravel, Django, MongoDB, PostgreSQL 🔔 Notifications: OneSignal, Firebase Push Notifications 🔗 Deep Linking and Referral Systems 📊 Monitoring: Sentry, PostHog (used on every project) 🔄 CI/CD: GitHub Actions, Azure Pipelines 🏗️ Architecture: DDD, Clean Architecture, Repository Pattern, BLoC, Riverpod, Provider 🎨 Animations: Lottie, Custom Painters, complex UI 🛒 E-Commerce: WooCommerce, custom cart systems 📍 Location: Background services, geofencing, live tracking, on-map navigation Don't just take my word for it 💬 🇹🇷 Berk (Voltran, Turkey): "This kind of work ethic is not easy to find" 🇸🇬 John Alam, CEO Nautilus SIP (Singapore): "Shahzad is quite hard-working, he spends good time trying to find the solution and ensures he has tried all possible ways before giving up" 🇬🇧 Chris Hamilton, CEO The Courier App (UK): "If I could relocate Shaz to the UK, I wouldn't let him out of our reach. That probably says enough on its own." Got an idea? A project stuck halfway? Or just need someone who actually cares about your product? Hit that invite button or send me a message. Let's talk 💬 Best regards

🟢 100+ successful projects | Top Rated Plus | 10+ years of experience 🟢 I help businesses collect reliable data, automate workflows, integrate APIs, and build AI-powered systems that reduce manual work and turn messy processes into clean, scalable, production-ready solutions. I’m Sergii, Senior Automation & AI Engineer at DataOx. For 10+ years, we’ve helped startups, small businesses, and growing teams build custom data extraction systems, workflow automation tools, API integrations, backend platforms, data pipelines, and practical AI automation solutions. What I can help you with: • Web scraping & data extraction Custom scraping systems for websites, marketplaces, directories, eCommerce platforms, real estate platforms, job boards, online portals, social networks, and other public or structured data sources. • Data processing & data pipelines Cleaning, structuring, normalizing, transforming, and preparing data for reporting, analytics, dashboards, CRMs, databases, Google Sheets, Airtable, internal tools, or AI systems. • Workflow automation & browser automation Automation systems that replace repetitive manual work, connect tools, handle business logic, run scheduled processes, and reduce operational workload over time. • API integration & backend systems REST API integrations, third-party API connections, custom API development, backend logic, database workflows, admin panels, internal platforms, and scalable business systems. • AI automation & AI-powered tools AI agents, ChatGPT / OpenAI API integration, Claude, Gemini, AI-driven workflows, document processing, natural language interfaces, AI-generated reports, classification, extraction, and decision-making support systems. • Existing system improvement Bug fixing, refactoring, stabilization, performance improvements, error handling, documentation, feature enhancements, and long-term support for existing automation, scraping, backend, or AI systems. Typical projects we build: • Web scraping and data extraction platforms • Price monitoring and competitor monitoring tools • Lead generation and contact data collection systems • Workflow automation and process automation tools • API integrations between CRMs, databases, SaaS tools, and internal systems • AI-powered assistants, AI agents, and business automation tools • Document parsing, classification, and reporting systems • Data pipelines, ETL processes, and structured datasets • Dashboards, admin panels, and backend web applications • Google Sheets, Airtable, Telegram bot, and email automation workflows Why clients work with us: • Strong experience with similar projects • Clear understanding of technical requirements and business goals • Reliable communication and structured project delivery • Clean, maintainable, and scalable architecture • Strong problem-solving approach • Ability to handle changing requirements and real-world edge cases • Production-ready solutions with error handling and clear documentation • Long-term support after the first version is delivered Tech stack and tools: Python, Java, FastAPI, Django, Spring Boot, PostgreSQL, MySQL, MongoDB, REST APIs, Selenium, Playwright, Scrapy, BeautifulSoup, Pandas, ETL pipelines, cloud services, OpenAI API, ChatGPT, Claude, Gemini, Google Sheets API, Airtable API, CRM APIs, payment APIs, and custom backend systems. I work best with clients who need more than just a quick script. If you need an experienced developer or technical partner who can understand the goal, clarify the scope, build a reliable solution, and support it over time, I can help. Send me a message with your project details, data sources, tools, API requirements, or current workflow, and I’ll help you define the best technical approach.

✅ Meta App Approvals — Guaranteed. Or You Don't Pay. While others guess their way through Meta's review process, I've spent 10+ years engineering the systems behind it. I don't just get approvals. I build the products that need them. 📊 The Numbers: 🏆 260+ Projects Completed 💰 $200K+ Earned on Upwork ⭐ Top Rated Plus | Top 3% Globally | 5-Star Rated 🚀 60+ Apps Approved in the last 6 Months 🔐 400+ Permissions Secured 🛠️ 30+ SaaS Products Built from scratch on Meta APIs Most freelancers submit your app with hope but I know exactly what Meta's reviewers want because I've been in this ecosystem since before most developers knew the API existed. 🎯 You bring the vision. I'll bring the build and the badge. 🚫 Rejected by Meta? I fix that fast. If you're hitting the "Invalid Screencast" wall or stuck in an endless rejection loop, you're not alone and you're in the right place. I've rescued hundreds of clients from exactly this situation. I handle everything, I record the screencast myself, prepare the full submission, and manage direct communication with Meta's review team until you're approved. Most clients get the green light in 1–10 business days. Meta & Social Platform Approvals: ✅ Meta App Reviews or API Permission Approvals Expert ✅ Facebook App Review Expert ( Facebook Pages & Instagram & Ads & Threads) API Permissions Approval for Advanced Access ✅ Facebook API permissions Approval Expert ✅ Instagram API Permissions Approval Expert ✅ Meta Marketing / Ads API Permissions Approval Expert ✅ Threads API Permissions Approval Expert ✅ Expert Facebook/Instagram/Telegram/WhatsApp Chatbot Developer ✅ Expert in API integration ✅ Expert Facebook API Developer ✅ Expert Instagram API Developer ✅ Facebook Tech Provider/ Access Verification Expert ✅ Facebook Business Account Verification Consultant ✅ Meta App Data Deletion Request Callback Implementation ✅ TikTok Marketing Developer App Approval Expert ✅ TikTok Developer API App Approval Expert ✅ Expert in Marketing Automation Software ✅ Expert in WordPress Plugin Development ✅ Worked with PHP Script and SaaS selling company Codecanyon, Jvzoo, Warrior+Plus. ⭐ Why clients come back: I don't hand you a checklist and disappear. I'm in the trenches with you — writing, recording, submitting, and negotiating — until Meta says yes. 𝗜𝗻𝘀𝘁𝗮𝗴𝗿𝗮𝗺 𝗔𝗣𝗜 (𝗜𝗻𝘀𝘁𝗮𝗴𝗿𝗮𝗺 𝗕𝘂𝘀𝗶𝗻𝗲𝘀𝘀 𝗟𝗼𝗴𝗶𝗻) instagram_business_basic, instagram_business_manage_comments, instagram_business_manage_messages, instagram_business_manage_insights 𝗙𝗮𝗰𝗲𝗯𝗼𝗼𝗸 𝗔𝗣𝗜 𝗣𝗲𝗿𝗺𝗶𝘀𝘀𝗶𝗼𝗻𝘀 pages_read_user_content, pages_manage_posts, pages_show_list, pages_manage_metadata, pages_user_locale, pages_user_gender, pages_manage_engagement, pages_messaging, read_insights, pages_read_engagement, pages_user_timezone, Business Asset User Profile Access 𝗜𝗻𝘀𝘁𝗮𝗴𝗿𝗮𝗺 𝗚𝗿𝗮𝗽𝗵 𝗔𝗣𝗜 (𝗙𝗮𝗰𝗲𝗯𝗼𝗼𝗸 𝗟𝗼𝗴𝗶𝗻) instagram_basic, instagram_content_publish, instagram_manage_comments, instagram_manage_messages, instagram_manage_insights, Instagram Public Content Access, Human Agent, instagram_branded_content_ads_brand, instagram_branded_content_brand 𝗠𝗲𝘁𝗮 𝗠𝗮𝗿𝗸𝗲𝘁𝗶𝗻𝗴 / 𝗔𝗱𝘀 𝗔𝗣𝗜 business_management, ads_read, ads_management, pages_manage_ads, leads_retrieval, catalog_management 𝗧𝗵𝗿𝗲𝗮𝗱𝘀 𝗔𝗣𝗜 threads_basic, threads_content_publish, threads_keyword_search, threads_manage_insights, threads_manage_mentions, threads_manage_replies, threads_read_replies 𝗪𝗵𝗮𝘁𝘀𝗔𝗽𝗽 𝗕𝘂𝘀𝗶𝗻𝗲𝘀𝘀 𝗔𝗣𝗜 whatsapp_business_messaging, whatsapp_business_management 🛠️ What I Do: I specialized in Meta API development and social media SaaS products — from Facebook Graph, Marketing, and Messenger APIs to Instagram (Graph, Business), WhatsApp Business & Cloud API, Threads, Twitter/X v2, Pinterest, Reddit, Shopify, integrations. I also handle Webhook, IPN, and Cron Job setups end to end. SaaS Products I've Built: Instagram Comment & DM Automation, Facebook Ads Creation Portals, Social Media Posting Platforms, AI Chatbots powered by OpenAI & ChatGPT for Messenger and Instagram, CRM Dashboards, and Marketing Automation Software. I've worked with ChatPion, Stackposts, and ChatWoot. Any white-label social media tool — I've seen it and can get it approved. ⚙️ Tech Stack: JavaScript (TypeScript,React,Next.js,Node.js, Express, Vue), Python, PHP (Laravel, CodeIgniter), MySQL, PostgreSQL,MongoDB,Redis,AWS,Git 💬 What Clients Say: ⭐ "Mir was an absolute game-changer. Deep understanding of Meta's API ecosystem — permissions, configurations, best practices. If you need a Meta API expert who is highly skilled and a pleasure to work with, Mir is the person to hire." — Sheila, USA ⭐ "Best guy on Upwork for API development. We already hired him on another project." — Marius, Romania ⭐ "His knowledge of FB and API integration is really deep and comprehensive. Very happy." — Fabrizio, Italy ⭐ "Anything Meta app permission related, he'll fix it for you." — Roy, USA