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Hi, Need a reliable senior Python developer who can design, build, and scale production applications? I have 9+ years of experience helping startups and businesses build SaaS platforms, REST APIs, automation systems, dashboards, cloud-based applications and data extraction tools. ✔Over my Upwork career I have: • Completed 68+ projects • Earned $50K+ • Delivered 3,000+ hours of development work • Maintained excellent client satisfaction ✔ My core expertise includes: • Python • Django • FastAPI • Flask • React • Node Js • Docker • PostgreSQL • AWS • API Integrations • Automation & Data Processing ✔ SERVICES • FastAPI & Django Development • Node Js / Express Development • REST API Development • Third-Party API Integrations • Web Scraping & Data Extraction • Workflow Automation • AWS Deployment • Docker & CI/CD • Backend Performance Optimization I focus on building maintainable, scalable systems rather than quick fixes. If you're looking for a developer who can take ownership from development to deployment , I’d be happy to discuss your project. Regards Sher Singh 🔑 Keywords - Full Stack Developer, SaaS Developer, React Developer, Next.js Developer, Node.js Developer, Django Developer, DjangoREST Developer, Flask Developer, FastAPI Developer, REST API developer, MERN Developer, MERN stack Developer, MEAN Developer, MEAN stack Developer, Dashboard Development, Web Application Development, Backend Developer, Frontend Developer, API Development, AWS Developer, SaaS MVP, Scalable Web Apps, Top Rated Plus Freelancer, Top rated Developer, API Integration, Python Scripts, Scraper, Browser Automation, Selenium, Python, DevOps, Docker, Docker-compose, Automated deployments

FULL STACK DEVELOPER / CLOUD ARCHITECT With over 12 years of experience in the software development industry, I am a seasoned Full Stack Developer and Cloud Architect known for delivering sophisticated, scalable, and efficient solutions to complex challenges. My commitment to innovation and precision makes me a reliable partner in the development of robust systems that seamlessly integrate front-end and back-end components, ensuring optimized performance and an exceptional user experience. Technical Expertise: Backend Development: Python (Django, Flask), PHP: Expertise in developing scalable and secure server-side applications. I excel in crafting APIs, managing databases, and implementing authentication and authorization systems to support complex business logic. Frontend Development: React.js, Angular, Vue.js, Next.js: Proficient in building dynamic, responsive, and intuitive user interfaces using modern JavaScript frameworks and libraries. Adept at creating seamless user experiences that are both visually appealing and functionally rich. DevOps & Cloud: Docker, Kubernetes: Skilled in containerization and orchestration, ensuring that applications are not only scalable but also easily deployable and maintainable across various environments. Strong experience in cloud architecture, enabling seamless CI/CD pipelines and automated deployment processes. Why Choose Me? As a dynamic, results-oriented developer and architect, I possess the unique ability to elevate projects to new heights. Whether it’s building systems from the ground up or enhancing existing platforms, my expertise spans the entire development lifecycle, from initial concept through deployment and optimization. My technical acumen, combined with a deep understanding of both frontend and backend ecosystems, makes me the perfect fit for any organization seeking to innovate and succeed in the digital landscape.

Need a secure Solidity smart contract, DeFi module, or crypto payment backend that can safely handle real transactions? I build production-ready Blockchain, Solidity, and Node.js/NestJS systems for Web3 startups backed by 100% Job Success, $10K+ Upwork earnings, and a CEH-certified security background. My strongest fit is where smart contracts and backend infrastructure meet: Solidity logic, wallet flows, APIs, databases, transaction processing, deployment, and post-launch reliability. I work with founders, CTOs, and product teams who need more than code. They need safe contracts, reliable APIs, clean architecture, and systems that can handle real users and real transactions. I also bring a CEH-certified security mindset, so security is considered from architecture stage, not added as an afterthought. What I Can Build for You • Secure Solidity smart contracts for ERC-20, ERC-721, ERC-1155, staking, vesting, escrow, token launches, and DeFi logic • High-performance Web3 backends using Node.js, NestJS, TypeScript, PostgreSQL, Redis, Docker, and AWS • Crypto payment systems including USDT escrow flows, wallet dashboards, deposits, withdrawals, and transaction processing • DeFi products including token swaps, bonding curves, liquidity automation, and real-time pricing • Smart contract integrations with React, Next.js, MetaMask, Ethers.js, Web3.js, Wagmi, and RainbowKit • System improvements including smart contract review, gas optimization, API cleanup, backend hardening, and production deployment Proof From Past Work • 100% Job Success on Upwork • Rising Talent profile status • CEH-certified security background • Experience across crypto escrow, ERC-20 swaps, fair-launch token platforms, NFT marketplaces, SaaS infrastructure, secure APIs, wallet flows, and transaction-heavy Web3 backends Client feedback from past work: “Delivered production-ready code with no hand-holding.” “Technically strong in blockchain concepts and proactive in solving issues.” “Delivered clean, well-structured code on time.” Core Technical Stack Blockchain: Solidity, Ethereum, Polygon, Arbitrum, Base, Hardhat, Foundry, OpenZeppelin, Ethers.js, Web3.js, Wagmi, MetaMask, IPFS, Chainlink Backend & Infrastructure: Node.js, NestJS, TypeScript, PostgreSQL, Redis, Docker, AWS, Nginx, CI/CD Frontend Integration: React, Next.js, wallet flows, dashboards, smart contract integrations Let’s Build It Right Send me your project details... what you’re building, where you’re stuck, or what you need secured. I’ll help you define the safest technical path and build a stable, production-ready system around it.

🎯 Expert DevOps | AWS | Docker | CI/CD | Python Scripting | Full stack development ✮✮✮✮✮ 5 Star Reviews ✮✮✮✮✮ 🕓🚀 Long term working relationship I am an experienced DevOps engineer with the ability to build up infrastructures, continuous deployment pipelines, monitoring from the ground up. If you just started a new project and you need someone to give your devs a stable infrastructure and deployment pipeline to work with, I am the guy you are looking for. What's on Offer: ✅ Seamlessly automated DevOps (in Docker, Kubernetes,Terraform, Ansible). ✅ AWS Cloud mastery for performance ✅ From APIs to data pipelines, I whip up efficient Python backends using Django, Flask ✅ Proactive monitoring and maintenance. Why Choose Me? ✔️ Clear and Transparent communication ✔️ Agile in nature ✔️ Quality-focused and client-centered ✔️ Quick Responsive ✔️ Ready for any complex challenges with its best solutions My top objective is to develop long-term client connections. I am always on time and dedicated to meeting deadlines and providing excellent work. To discuss your amazing initiatives and take your business to new heights, contact 𝐑𝗲𝗮𝗰𝗵 𝗼𝘂𝘁 𝘁𝗼 𝗺𝗲 𝗧𝗢𝗗𝗔𝗬.

I am having around 8 years of experience in web development in different techs NODE JS, GOLANG etc. Backend techs:
 - GOLANG (SQLC, gin, mux, FIBER etc), PHP, PGSQL, MYSQL, MONGODB
 - Around 6 YEARS of experience in Golang FRONTEND:
- having mid level experience in Next js, Angular js DATABASE:
- - Hands-on experience MYSQL, POSTGRES, MONGODB
 - Designed database from scratch for ecommerce, crowdfunding, gambling, social media, crm etc. AWS SERVICES
 - Hands-on experience in AWS
 - VPC, EC2, S3, Security Group, Load Balancer, Route 53, Secret, subnets, route tables, NAT Gateway, EKS, LAMBDA etc
 - Worked on DOCKER and Kubernetes and terraform as well. GCP SERVICES
 - Compute Engine
 - Google Kubernetes Engine - VPC, Load Balancing

I’m a backend developer specializing in Node.js, TypeScript, Python, Cloudflare Workers, PostgreSQL, AWS Lambda, REST APIs, GraphQL, and Stripe integrations. I help SaaS teams fix slow APIs, unreliable payment flows, broken integrations, and backend systems that are starting to fail under real traffic. Recent results include scaling a European SaaS backend to 4M+ API requests/day and €1.5M/month in payments, reducing response times from 350ms to under 100ms with zero downtime. That’s the kind of problem I’m best at: APIs that are slow, payment systems that are flaky, infrastructure that wasn’t built for the load it’s now getting. Recent work on Upwork • HIPAA-compliant healthcare backend • AI chatbot with a RAG pipeline (OpenAI, LangChain) • Stripe integrations across several SaaS products, no failed transactions • High-volume edge APIs on Cloudflare Workers How I work: I scope the problem before writing code, send updates twice a week, and own the outcome instead of just closing tickets. Most clients here have either extended or come back with new work. If something in your backend is broken, slow, or about to break at scale, tell me what’s happening and I’ll tell you how I’d fix it.