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From a business idea to a scalable, high-performance backend system, I deliver solutions that are not just functional but built to scale, perform, and succeed. I specialize in Golang & Python development, crafting robust APIs, event-driven architectures, and data-intensive systems that power real-world products, from eCommerce platforms and fintech applications to AI/ML-powered solutions and real-time data pipelines. If you’re looking for a backend engineer who can own your project end-to-end, from architecture design to production deployment, I can be your one-stop solution. What I Deliver Backend Development – APIs with Go (Fiber, Gin), Python (Flask), gRPC, and WebSockets. Scalable Microservices – Event-driven systems with Kafka, Redis, and async schedulers. Database Expertise – PostgreSQL, MongoDB, TimescaleDB with schema optimization & indexing. 3rd-party Integrations – Payment Processing, Recommendation Systems, Automated Messaging, and Emails. AI & Data Systems – Real-time analytics, ML/NLP pipelines, OCR, predictive modeling. DevOps & CI/CD – Dockerized deployments, GitHub Actions automation, cloud-ready apps. Tech Stack 🔹 Languages: Golang, Python 🔹 Frameworks: Fiber, Gin, Flask 🔹 Databases: PostgreSQL, MongoDB, TimescaleDB, Redis, CockroachDB, ElasticSearch. 🔹 Technologies: gRPC, GraphQL, Debezium, JWT/Paseto, WebRTC, Celery, Asynq. 🔹 Messaging/Events: Kafka, RabbitMQ, WebSockets, Webhooks. 🔹 DevOps: Docker, GitHub Actions, Automated Testing. 🔹 Deployments: Clouds(AWS, GCP). 🔹 Integrations: Stripe, Klaviyo, SearchSpring, Twilio, Google Merchant Center. Industries I’ve Built For E-Commerce & Marketplaces – High-concurrency platforms with secure payments & advanced product search. Smart Infrastructure & IoT – Vehicle tracking, RFID ingestion, real-time data sync. Fintech & Trading Apps – Live streaming data, ML-driven signals, secure user management. Food & Delivery Platforms – Microservices for orders, payments, and logistics. AI & NLP – Sentence correction, OCR pipelines, and AI-powered automation. I don’t just write code — I build backend engines that accelerate business growth. Whether you need a new system from scratch or to scale your existing product, I’ll help you architect, develop, and deploy with confidence. Let’s jump on a call to discuss how we can turn your backend into your biggest growth driver.

Python Developer specializing in FastAPI, Django, Flask & AI/ML solutions ⭐ Top Rated Plus – Ranked in the Top 1% of Lead Python developers on Upwork ✅ 14+ Years of Senior Python Excellence | 13,000+ Hours Delivered I personally handle all development and client communication, ensuring high-quality, scalable, and secure applications without outsourcing. From MVPs to enterprise SaaS platforms, I transform complex requirements into production-ready systems. I’ve been working with Django (since v0.3), Python (v2.3+), FastAPI, Flask, and React. I specialize in building intelligent systems with AI/ML, NLP, and LLMs. Since 2019, I’ve been leading cross-functional teams globally, while also working individually with clients to deliver clean, scalable solutions. Most of my work has been on production systems already serving real users, where I acted as the technical owner, not just an implementer. 𝗔𝗰𝗵𝗶𝗲𝘃𝗲𝗺𝗲𝗻𝘁𝘀: Contributed to Open edx: Enhanced the global open-source learning platform with Python/Django. KredX Financial Platform: Built APIs & real-time analytics with FastAPI for high-volume transactions. The Entertainer (Python + React): Delivered large-scale consumer app supporting millions of users. Moeving Mobility Platform: Designed scalable Python microservices for real-time fleet management. MTailor: Automated ML pipelines for computer vision body measurements. Surmount.AI: Built AI-powered legal assistant using Django + FastAPI + LLMs. Deflection.AI: Customer support system with Python APIs + vector similarity + NLP. I help startups and enterprises turn ideas into production-ready software. From rapid MVPs to AI-powered platforms, I combine deep technical expertise with hands-on leadership, guiding global cross-functional teams to deliver results on time and at scale. I am a CTO-level Senior Python Developer to lead the technical direction and hands-on development of a scalable, cloud-native platform built on Python and AWS 𝗖𝗼𝗿𝗲 𝗘𝘅𝗽𝗲𝗿𝘁𝗶𝘀𝗲: Backend & APIs: Python (FastAPI, Django, Flask), REST, GraphQL, async programming, microservices Databases: PostgreSQL, MySQL, MongoDB, Redis (optimized schemas, queries, and data modeling) AI/ML & Data: LLMs (OpenAI GPT, Whisper), NLP pipelines, TensorFlow, PyTorch, Pandas, NumPy Cloud & DevOps: AWS (Lambda, ECS, RDS, S3), GCP, Azure, Docker, Kubernetes, CI/CD automation Full Stack Collaboration: React, Next.js, Vue.js with secure, Python-driven backends 𝗪𝗵𝗮𝘁 𝗜 𝗗𝗲𝗹𝗶𝘃𝗲𝗿: ✔️ Scalable REST/GraphQL APIs & microservices ✔️ Data pipelines & AI/ML-powered systems ✔️ Cloud-native architectures (AWS/GCP/Azure) ✔️ Secure, tested, and future-proof code (CI/CD) ✔️ MVP-to-enterprise scaling with clear communication 𝗞𝗲𝘆𝘄𝗼𝗿𝗱𝘀: Python Developer | Django Expert | FastAPI Developer | Flask Developer | Backend Engineer | API Development | AI/ML Engineer | Chatbot Developer | NLP Specialist | React Developer | SaaS Architecture | Cloud & DevOps | Docker | AWS | Data Pipelines | LLMs | TensorFlow | PyTorch | Web Scraping

If your .NET backend is holding your product back, I can fix it. I'm a Senior .NET Architect with 10+ years building production systems for US clients — specializing in ASP.NET Core, Clean Architecture, and AI integration that ships. What I've built recently: → Nexora — a multi-tenant SaaS platform with 10 .NET 9 microservices, pluggable LLM layer (OpenAI + Ollama), real-time SignalR, and event-driven architecture via RabbitMQ → IVR systems with real-time call dashboards using SignalWire + .NET Clean Architecture → 1,300+ hour engagement with a US software company (5-star, still ongoing) I work with: Clean Architecture, CQRS, DDD, EF Core, SQL Server, Docker, Azure, React — and I know when to use each one and when not to. What working with me looks like: → Scoped estimates, not guesses → Code your next developer can actually read → Honest pushback when a requirement will cause problems → Updates without you having to chase me Top Rated · 93% JSS · 10+ years · $40K+ earned on Upwork If you're building something serious, let's talk.

🧑‍💻 Full-Stack Web Development 🖥️ End-to-end web app development with MERN (MongoDB, Express, React, Node.js, NestJs, NextJs) and GoLang 🎨 Responsive UI/UX with React, Tailwind CSS, MUI, and Ant Design 🔌 RESTful & GraphQL API development and third-party integration ☁️ Cloud Infrastructure & DevOps 🚀 Cloud setup and scaling on AWS (EC2, S3, Lambda) and GCP (Cloud Functions, Firebase) 🐳 Docker, GitHub Actions, Jenkins, CI/CD pipelines ⚙️ Serverless architectures, microservices, and automation 🧱 Infrastructure as Code (Terraform, CloudFormation) 🤖 Generative AI & LLM Integration 💬 AI chatbots and assistants using OpenAI, LangChain, Vertex AI 🧠 LLM fine-tuning, prompt engineering, embeddings & vector search 📝 Text generation, summarization, and intelligent automation for workflows 🔗 API & Third-Party Integrations 📅 Google APIs (Calendar, Maps, Drive), Firebase services 💳 Payment gateway integrations: Stripe, PayPal 📲 Social APIs: Meta, Instagram, LinkedIn, Twitter 🔐 Backend Architecture & Optimization 🛡️ Scalable, secure backends in Node.js & GoLang 🔑 Auth systems (JWT, OAuth2, Firebase Auth) 📊 Background jobs, queues (BullMQ, RabbitMQ), and cron tasks ⚡ Performance optimization, Redis caching, deployment hardening 🧠 Code Reviews & Technical Consulting 🔍 Full-stack code audits and performance reviews 🏗️ Architecture planning, system migration, MVP scoping 🤝 One-on-one consultations for tech strategy and decision-making

Hi! I am Waleed Saifi, a MERN stack developer with 6+ years of experience building SaaS products with real product logic: billing, roles, dashboards, CRMs, messaging, APIs, reports, and workflows. I build and repair React, Next.js, Node.js, Express.js, MongoDB, and TypeScript apps that need to hold up in production. Most developers can build screens. The harder part is building the system behind those screens: the data model, user permissions, payment flow, admin logic, API structure, third-party integrations, deployment setup, and the edge cases that show up after real users start using the product. That is where I usually fit in. I work best on SaaS platforms, internal tools, dashboards, CRMs, marketplaces, booking systems, real-time apps, and web/mobile products where the application is more than a basic frontend. The kind of problems I handle: - Turning a rough SaaS idea into a working MVP with frontend, backend, database, auth, payments, and deployment - Cleaning up React or Next.js apps that became hard to maintain - Fixing slow dashboards, broken APIs, unstable MongoDB queries, Stripe issues, auth bugs, and deployment failures - Building admin panels, user roles, subscription flows, notifications, messaging, reporting, and workflow automation - Integrating Stripe, Stripe Connect, Twilio, Google Maps, Firebase, OAuth, JWT, webhooks, and custom APIs - Adding AI-assisted features where they make the product more useful, not just because “AI” sounds good Recent product work includes: ▪️WAWCD .com - SaaS CRM platform Built with React, Next.js, Node.js, and MongoDB for 20K+ active users. Worked on CRM functionality, Stripe payments, Twilio messaging, and AI-assisted workflow automation. ▪️Tournated .com - sports management platform Built as a web platform and expanded toward mobile functionality using Next.js, Node.js, MongoDB, and mobile-first product flows. ▪️Prospeo .com - real estate SaaS platform Built with React and Node.js for lead generation, data management, and AI-assisted property insights. When I start on a project, I do not jump straight into code. I first look at the product goal, user roles, database structure, API flow, payment logic, integrations, and deployment plan. Bad architecture early usually turns into expensive cleanup later, so I prefer building it correctly from the start. I am not the best fit for simple brochure websites or one-page landing pages. I am a strong fit if you need a MERN stack developer who can take ownership of a real product, make technical decisions, and ship features that work beyond the demo stage. Please send me the app details, current stack, and what needs to be built or fixed. I will respond with a practical technical plan.

Full Stack Java Engineer with 5+ years of experience building scalable, production-grade systems for logistics, food delivery, and enterprise platforms. I specialize in Spring Boot microservices architecture and AI-powered backend systems — designing end-to-end solutions that handle high traffic, complex workflows, and real-time data processing. My background in logistics technology means I understand not just the code, but the business operations behind it. What I bring to your project: - AI integration using OpenAI, Gemini, and LangChain4j for intelligent automation and chatbot backends - Microservices architecture with Spring Boot and Spring Cloud - Event-driven systems using Apache Kafka and RabbitMQ - Full stack development with React.js and Vue.js frontends - REST API design, development, and third-party integrations - AWS infrastructure — EC2, RDS, S3, deployment pipelines - Database design and optimization across MySQL, PostgreSQL, and Oracle - JWT-based authentication and Spring Security - Legacy system migrations and monolith-to-microservices transitions - Docker, CI/CD pipelines, and production deployment I have built and maintained systems processing hundreds of thousands of records daily — including a 2.5-year long-term engagement delivering a full-stack logistics and food delivery platform on AWS, earning a 5.0 rating across every review. I do not disappear after handing over code. I ask the right questions before starting, communicate clearly throughout, and flag issues before they become problems. Clients who work with me once tend to come back. 100% Job Success Score across every contract on Upwork. If you need a reliable full-stack engineer who builds intelligent, scalable systems — let's talk.