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Senior full-stack engineer with 6 years of professional experience — I build complete web applications, with particular depth on the backend. My backend core is Java and Spring Boot: I've engineered and maintained production systems for banking clients, with a strong focus on clean data handling, SQL optimization, and reliable, well-tested code. I also build backends in Node.js, and I'm comfortable across MySQL, PostgreSQL, MongoDB, and REST API design. On the frontend, I build production interfaces with React, Next.js, and TypeScript. Because I work across the full stack, I can take a feature from database to API to UI — or step into an existing codebase on either side and find my way around. I've also built AI agent systems: AgentRoute Studio, an open-source goal-driven agent platform with verification layers, multi-model routing, risk gates, and budget monitoring. If you're integrating an LLM and want it reliable rather than just a demo, I can help there too. I'm based in China and work comfortably with both English and Japanese-speaking clients in writing — I spent years collaborating with Japanese teams. What I bring to every project: a senior engineer's discipline around reliability, clear communication, and code I'd be willing to maintain myself. Tell me what you're building and I'll tell you honestly how I'd approach it — and whether I'm the right fit.

Welcome 👋I am an experienced web developer who is passionate about delivering successful projects and has a track record of delivering them 🚀 🔑Key points about me: - Expert web developer with over 4 years of experience developing complex web applications. - Good communicator, with experience managing and leading development teams. - I have an entrepreneurial mindset and a product-oriented mindset, I enjoy not just writing code, but making projects successful. - A full-fledged developer, although I prefer the back-end. - Deep understanding of OOP, design patterns, domain-oriented design. - Specializes in React, Python, TypeScript, Flask, Django, FastAPI, WEB3 - Ability to write complex and efficient database queries, optimizing the site's performance. Knowledge of NoSQL (MongoDb), SQL(Postgresql, MySQL, SQLite). - Algorithms and Data Structure, Catching(Redis) - Experience with asynchronous messaging/queue processing. - Worked with many APIs such as Stripe, Saferpay, Twilio, Cronofy, Sendgrid, Hubspot, Zapier, Viva, PayPal and more. 💻When programming, I use industry best practices to achieve the best results; I consider myself a talented programmer. I am detail-oriented, my code is always well-commented, clean and easy to understand. I am also a quality-oriented developer and my code is always well-tested. I am able to plan, execute, test and launch projects. I am a self-starter who can see things through to the end. I am passionate about building great projects and helping companies succeed. Feel free to message me to discuss your project and make it a success!🚀🚀🚀

🚀 I help startups and enterprises build smart, scalable SaaS platforms and AI-powered tools that drive efficiency, automate workflows, and deliver real business value. With 8+ years of experience, I’ve led the development of 40+ SaaS products and 25+ AI-integrated applications—from MVPs and internal dashboards for early-stage startups to enterprise-grade platforms with millions of users. I specialize in combining intelligent automation with clean, modular software engineering. Whether you're launching a new product, optimizing internal tools, or integrating LLMs (GPT-4, Claude, LLaMA), I bring a business-first mindset and deep technical expertise. ⚙️ What I Do Best AI & Generative AI Integration: • LLMs: GPT-4, Claude, LLaMA, Mistral, Gemini • Tools: LangChain, LlamaIndex, Pinecone, Chroma, FAISS, Weaviate • Use Cases: Smart chatbots, PDF Q&A, document summarization, RAG pipelines, auto-tagging, semantic search • NLP, Computer Vision, OCR, Audio Processing, Fine-tuning SaaS & Workflow Automation: • Full-stack SaaS: React.js, Next.js, Angular, Node.js, Python (FastAPI, Django, Flask) • Internal Tools: Admin panels, CRMs, ERPs, custom dashboards • Features: Multi-tenancy, RBAC, analytics, billing, SSO, dynamic forms • Automation: Background workers, schedulers, event-driven flows, email & notification engines Web & Mobile Development: • Frontend: React, Next.js (SSG/SSR), Angular, Vue.js, Tailwind, SCSS • Backend: Python (FastAPI, Django, Flask), Node.js (Express, NestJS) • Mobile: React Native, Expo, Flutter • Real-time features, optimized SSR, and caching for performance DevOps & Cloud Infrastructure: • Cloud: AWS (CDK, Lambda, S3, Cognito, SageMaker), GCP (Vertex AI, Firestore, GKE), Vercel, Netlify • CI/CD: GitHub Actions, Docker, Kubernetes, observability (Grafana, CloudWatch, ELK) Tech Stack Summary: Frontend: React.js, Next.js, Angular, Vue.js Backend: Python, FastAPI, Django, Flask, Node.js, NestJS AI Tools: GPT-4, Claude, LangChain, Pinecone, LlamaIndex, HuggingFace Cloud: AWS, GCP, Vercel, Netlify Mobile: React Native, Flutter Databases: PostgreSQL, MongoDB, Firebase, Supabase 🏆 Highlights & Achievements: ✅ Delivered 40+ production-grade SaaS applications ✅ Built AI tools saving 500+ hours/month in enterprise workflows ✅ Integrated GPT-powered features like chat, doc analysis, and smart forms ✅ Helped startups secure funding with investor-ready MVPs ✅ Scaled platforms to 2M+ users with robust backend re-architecture ✅ Built HIPAA-compliant healthcare dashboards & finance-grade KYC tools Industries Served: • SaaS & B2B • Healthcare & Wellness (HIPAA-compliant) • E-Commerce & Retail • FinTech & InsurTech • EdTech & LegalTech • Real Estate & Logistics 💬 Why Clients Work With Me: • Deep expertise in both AI & full-stack product development • Focus on clean, scalable, and production-ready code • Excellent communication, fast turnarounds, and weekly updates • Strategic partner, not just a coder, who aligns with your business goals 📩 Let’s connect for a free consultation and discuss how I can help bring your SaaS or AI-powered solution to life faster, smarter, and tailored to your users.

Here are feedbacks from my previous clients: "Direct Quote from FAANG measurement manager who worked with Hamza for over 1.5 years: "I had the privilege of working alongside Hamza in his role as a Senior Cloud & Back End Engineer. Hamza's comprehensive understanding of computer science, architectural and design patterns, and cloud technologies played a pivotal role in the success of our initiatives. His acumen in developing and implementing robust, scalable solutions was apparent in our marketing campaign planner. His expertise in Python, Javascript, and his adept use of databases like PostgreSQL and Firebase made him an integral part of our team. Hamza's proficiency in leveraging Google Cloud Platform was instrumental in enhancing our project's performance. He skillfully increased our systems' efficiency by utilising GCP MemoryStore, and his efficient handling of background tasks using Cloud Run and Cloud Scheduler was truly commendable. His pragmatic approach to backend development and extensive knowledge of API design and web security significantly contributed to the stability and performance of our software. Hamza's ability to balance his advanced technical skills with excellent communication abilities set him apart. His commitment to the team, made him a reliable team player. His dedication extended to meticulously reviewing the code developed by others, and his feedback invariably improved our productivity and work quality. I confidently recommend Hamza for any role requiring expertise in cloud and backend engineering. His potent combination of cloud and backend skills, coupled with his professional dedication, will undeniably be an asset to any team fortunate enough to have him"" --- "A really professional Dev Ops expert. Hamza is highly organised and very responsive. Managed to get a really tricky Google Cloud job done for me with a minimum of fuss. Definitely recommended, great work 10/10, thanks." --- "Did a great job - 10/10. One of the most thoroughly organised and responsive freelancers I have worked with. Did an excellent job in every area. This job was for a tough Google Cloud Dev Ops job based on a Strapi installation. He solved all the problems properly and communicated clearly and efficiently throughout the entire job. Overall very happy with the result and definitely wouldn't hesitate to recommend. Excellent work." --- "Hamza is AMAZING. He is so quick at the tasks because he is so experienced in python. We already have multiple jobs lined up for him on our project. He is going to be our python wizard! He is also very easy / kind to work with. Highly recommended." ---------- For several years, I have focused on deploying web applications and big data pipelines on Google Cloud Platform, utilizing its services such as Google App Engine, Cloud Run, Cloud Functions, Google Compute Engine, BigQuery, Dataflow. Load Balancer, Cloud CDN and Cloud Armor. My expertise lies in programming Python web and data applications, primarily using Django, Flask, FastAPI, and Webapp2 frameworks. Additionally, I have knowledge of other web technologies such as React JS, HTML, CSS, and JavaScript. I am always open to new challenges and problems, continually enhancing my skills and knowledge across various areas. I also have experience with web scraping for e-shops and real estate websites using tools like Scrapy, Playwright, Selenium, and BeautifulSoup.

I am a Full-Stack Developer with 4 years of experience building scalable, enterprise-grade applications. Most recently, I’ve specialized in **Legal Case Management Systems**, delivering modular platforms that integrate complex billing, secure messaging, and AI-ready document tracking. I don’t just build UIs. I architect complete systems, from Dockerized environments and MySQL schema design to robust Flask APIs and high-performance React/Next.js frontends. 🛠 Technical Expertise Frontend ✅ React.js ✅ Next.js ✅ JavaScript (ES6+) ✅ Tailwind CSS ✅ Bootstrap Backend ✅ Python (Flask) ✅ Jinja2 Templating Database ✅ MySQL (Schema Design, Optimization, Seeding) QA & DevOps ✅ Cypress (End-to-End Testing) ✅ Postman (API Testing) ✅ Docker / Docker Compose ✅ Git Mobile ✅ Flutter (Cross-platform Development) 💼 Why Hire Me? ✅ Testing-First Mindset I use Cypress and Postman to ensure every feature is fully tested, bug-free, and production-ready before delivery. ✅ Enterprise Experience Proven track record handling sensitive data and complex legal/fintech workflows with security and compliance in mind. ✅ Modular & Scalable Code I write clean, maintainable, and scalable code designed to grow with your business needs. 🚀 Let’s Build Something Great If you’re looking for a developer who values quality, security, and clear communication, let’s discuss how I can make your next project a success!

Top Rated Developer 200+ Happy Customers 100% Job Success Rate Highly Educated & Experienced (MCA in Computer Applications) I am a highly skilled and educated AI-focused developer and automation expert with 8+ years of experience building intelligent digital solutions. I specialize in combining No-Code tools, LLMs (Large Language Models), OpenAI integrations, Airtable workflows, React applications, and Python automation to deliver scalable, cost-effective, and future-ready systems. Over the years, I have built dozens of AI-driven applications, automation platforms, and intelligent workflows for industries like E-commerce, Real Estate, Social, SaaS, and Corporate solutions. My high-quality work is recognized both here at Upwork and beyond. I hold advanced certifications in AI development and automation. My expertise includes: LLMs & OpenAI: GPT-4/4o apps, fine-tuned models, prompt engineering, RAG pipelines No-Code & Airtable: End-to-end CRM, dashboards, workflow automation, SaaS backends React & Frontend: Scalable and interactive user interfaces with seamless AI integration Python: Data pipelines, AI/ML logic, backend automation, API development Automation Orchestration: AI agents, API integrations, and business process automation I work fast and am goal-oriented—whether it’s building from the ground up or enhancing existing systems. I am always seeking new challenges and constantly learning cutting-edge tools and techniques in the AI ecosystem. Additional strengths include custom UI/UX design for AI-powered platforms, workflow optimization, and integrated automation systems across multiple business domains. ⚡ If you need a complete AI solution delivered in a cost-effective manner, I’m your best option here.