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With 12+ years of experience in software design and development, I’m now focused on AI-based IT products. I work in the following areas: Core Technologies: Python (FastAPI), Next.js/React, PostgreSQL, Docker, algorithms and libraries for building AI agents (LangGraph, RAG pipelines, and agent calling tools). Specialization: - AI agents and automation - AI-empowered backend systems - Web applications with modern UI Why you should choose me: - Track record of successful projects - Clear communication and timely delivery - Quality software architecture and hands-on approach Contact me if you need someone who can run your AI project from A to Z.

I build custom Amazon seller software — SP-API dashboards, repricing engines, PPC tools, and Keepa-powered research platforms. 70+ tools shipped over 7+ years, including sellerbot, seller-shark and sellerwiz. I work with Amazon sellers, agencies and SaaS startups who need marketplace data turned into automated, scalable software — whether that's a full multi-tenant platform or a single API integration that has to be right. What I build Amazon Seller Dashboards — profit tracking, inventory monitoring and sales analytics on real-time SP-API data FBA/FBM Automation — repricing engines, inventory alerts, order management, multi-channel sync Amazon PPC Tools — Advertising API integration, keyword automation, bid optimization, campaign performance tracking Keepa API Integration — price history tracking, sales rank analysis, deal alerts, historical data dashboards Multi-tenant SaaS Platforms — white-label Amazon tools for agencies, Chrome extensions, and MWS-to-SP-API migrations Recent work A reporting dashboard handling SKUs with real-time SP-API sync A Keepa-powered product research platform now used by Amazon sellers Automated SP-API dashboards that cut a seller's manual reporting time Stack PHP (Laravel), Python (FastAPI/Flask) and Node.js on the backend. React and JavaScript on the frontend. MySQL, PostgreSQL and MongoDB. AWS Lambda, S3, RDS and EC2 for infrastructure. 100+ API integrations across e-commerce, payments, shipping and CRM. How I work I start by scoping the actual problem before quoting — if SP-API rate limits or report latency will constrain what you're asking for, you'll hear it upfront rather than three weeks in. You get documented code, a working staging environment, and a handover you can give to another developer without needing me. Send me your requirements and I'll come back within a few hours with a plan, a timeline and a fixed scope.

I am a Senior Software Engineer specializing in C#, .NET, Blazor (Blazor WebAssembly & Blazor Server), Python (Django & FastAPI), and React, with a strong background in designing and delivering robust, scalable, and high-performance web applications, particularly in SaaS, FinTech, and ERP domains. My core expertise spans across .NET Core Web API, ASP.NET MVC, Blazor Server, Blazor WebAssembly, Django, FastAPI, and modern full-stack architectures. I have extensive hands-on experience with Blazor component libraries, including MudBlazor, Radzen Blazor, Ignite UI, and Syncfusion, enabling me to build rich, responsive, and enterprise-grade user interfaces. I am equally proficient in Python-based backend development, building secure RESTful APIs, high-performance services, and data-driven systems using Django and FastAPI, tailored for scalable SaaS platforms, FinTech solutions, and ERP systems. I regularly work with full-stack architectures such as Django + React and .NET + Blazor, ensuring clean design patterns, maintainability, and optimal performance. My experience also includes backend automation, data processing, and designing efficient, concurrent systems to support complex business workflows and financial operations. I am a proactive problem solver who thrives in Agile environments, values clean code and best practices, and collaborates effectively within cross-functional teams. I am easygoing, open-minded, and highly adaptable, with the flexibility to work seamlessly across different time zones. Currently, I am available and highly motivated to contribute to impactful, innovative, and high-value SaaS, FinTech, and ERP projects.

✅ 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: 🏆 270+ 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 1–20 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

Top Rated Plus freelancer with 17+ years of experience building backend systems, APIs, and internal tools for startups and enterprises worldwide. I specialize in PHP/Symfony backend development, third-party API integrations, and no-code/low-code platforms — plus growing expertise integrating OpenAI and chatbot technology into client workflows. Core expertise: -- Backend & APIs: PHP, Symfony, CodeIgniter, REST API design & documentation (Swagger) -- No-Code/Low-Code: Bubble(Certified), Retool, Xano, Airtable (Certified) -- Databases: MySQL, PostgreSQL, Firebase, Parse, Supabase -- Integrations: Twilio, Salesforce, Xero, OpenAI API, payment gateways, Google Dialogflow Directory Platforms: Brilliant Directories, eDirectory Recent impact: -- Built and maintain a large-scale classified platform — backend, data-scraping APIs, and --performance optimization -- Delivered backend systems for a cleaning-services platform processing billions of records across web, iOS, and Android -- Integrated OpenAI into a Bubble application for automated evaluation and structured feedback generation -- Built a Dialogflow-based chatbot for a food delivery platform -- Completed multiple Retool internal tool projects integrating APIs and databases to streamline client workflows Whether you need a robust backend, a fast no-code MVP, a legacy system modernized, or AI capabilities integrated into your existing product, I deliver reliable, production-ready work — fast. Let's talk about your project.

I build production AI SaaS. Not chatbot demos. Next.js, TypeScript, Node.js, NestJS, Supabase, PostgreSQL, OpenAI, Claude, Stripe, auth, and billing. I help founders ship web apps where AI is part of the product: structured LLM workflows, RAG and document Q&A with LangChain, dashboards, authentication including Supabase RLS, Stripe subscriptions and webhooks, and REST APIs. I also audit existing SaaS and AI generated code before launch, covering security, data access, payments, and deploy. Proof: - BridgeOpsOne. AI SaaS with OpenAI workflows, authentication, APIs, entitlements, and a Chrome extension. Live on the Chrome Web Store. - ReelFlix. Live subscription SaaS: React, Supabase Auth, PostgreSQL, RLS, payments. - Agentic RAG. NestJS, LangChain, and vector search for document grounded Q&A. - RewardsX. Next.js, Node.js, and PostgreSQL internal SaaS: ledger, RBAC, production APIs. - JoulesLabs. Next.js, NestJS, Stripe, and Shopify webhooks on production SaaS. How I work: I read the existing codebase first, then fix the highest risk path (auth, data, payments) and ship in clear milestones. Stack: Next.js, TypeScript, React, Node.js, NestJS, PostgreSQL, Supabase, Stripe, OpenAI, LangChain, REST APIs, Docker, AWS. Top Rated. 10 plus years. Available for hourly or fixed AI SaaS builds.