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🚀 Senior Back-End Engineer & Tech Leader (14+ yrs) — I help businesses build scalable, secure, and high-performance systems that handle millions of users and requests with ease. ✅ Delivered 50+ successful projects across healthcare, fintech, ed-tech, real estate, government, and non-profit sectors. ✅ Scaled apps from 1K → 1M+ daily requests and platforms from zero → 1M+ users. ✅ Trusted by global companies including Upwork (NASDAQ: UPWK), Letshego (Botswana Stock Exchange), OCO Global, and multiple startups worldwide. If you need a reliable partner who can architect solutions from scratch or optimize existing systems for performance, security, and scale — let’s talk. Do you like Upwork's Reports & Time tracking feature? I am one of those developers who built that :) ✅ How can I help you ✓ I can handle your all end-to-end requirements analysis, UX, development, testing & delivery so you can focus on your sales & operations ✓ I can extend/develop your MPV product to production-ready ✓ I can develop products from scratch until the final delivery and support with maintained code quality and proper code coverage ✓ I can maintain your currently live products in the most optimum way by keeping quality and customer experience at first place in mind and with the minimum team and can save your cost ✓ I can choose the right technology stack and tools for your solution based on real needs and can save costs ✓ I can manage the team, do code reviews, handle CI/CD and releases, support live systems ✓ I can understand and implement the most difficult parts of software systems at very large-scale platforms like Upwork, (I am one of the Upwork platform devs) ✅ Expert areas - Java based back-end frameworks like Spring Modules (Spring MVC, Spring Security, Spring AOP, Spring Rest, Spring Data/JPA) & ZK (Zkoss) - ECMS implementation with Alfresco Content Services 4.x, 5.x, 6.x and Alfresco Process Services (Activiti) - RDBMS (MySQL, PostgreSQL, Oracle) - Graph/Document Databases MongoDB and DynamoDB - Web Crawlers with all features - Microservices based architecture implementation with Spring boot, Spring Integration and Apache Camel - AWS experience with RDS, SQS, SNS, SES, S3, and EC2 Instances - AWS API implementation experience - Queue based implementations with ActiveMQ/SQS - Test driven development implementation with unit and integration test cases with Junit/TestNG + Mockito + Spring - Database integration frameworks like JDBC/Hibernate/Sprint Data (ORM) and Spring Mongo - REST based Web Service/API implementation with Spring REST - CI/CD implementation with (Bamboo + Jenkins + Maven + Nexus + GIT(Bitbucket/Gitlab/Github)) - Payment Gateways implementations like Paypal and Stripe with debit/credit card integration - Solr/Lucene/ElasticSearch search engine integration - Jasper Reports (with DynamicJasper as well) - Agile Methodology understanding all terminology - Experience with implementing very complex queries with MySQL db - Java based Servers Tomcat/JBoss - Repositories like Git, SVN, P4V(Perforce) ✅ What my clients says (You may check in Work History) ⭐⭐⭐⭐⭐ "Vishal is best developer I have worked with till date. He is prompt responsive, an incredible problem solver, very professional, highly skilled and great team leader. He handles our portal continuous development including all project phases starting from requirement gathering(calls), task creation with all details, estimation, development, deployment on all environments, testing, creating wiki pages, choose right technology stack and AWS resources and manage tickets! He is handling dev team and also do development himself and supports everyone. Will certainly work with him again when we restart the project development! Highly recommended developer." 👤 Hugo Galicia ( CEO @ chicagodealvault.com ) ⭐⭐⭐⭐⭐ "It was a highly positive experience working with Vishal. He was conscientious, always doing his due diligence to clarify any uncertainties before starting work. He gives accurate estimates of effort/time required for work, and either delivers on time or early. Overall a very reliable and dependable worker. We hope to work together with him soon. Highly recommended!" 👤 Dominik Bieringer ( CEO @ Kandu ) ⭐⭐⭐⭐⭐ "Very experienced and diligent contractor" 👤 Abhijit Dhar ( VP - Technical Services @ Whitehat Virtual Technologies ) ⭐⭐⭐⭐⭐ "Vishal is an excellent java engineer, with great business logic, self-motivated, with deep technical knowledge. He jumped right in and understood the current project architecture with minimum KT and limited documentation. He is always eager to solve new issues. I highly recommend him and will definitely work with him again, if opportunity permits. A pleasure to work with" 👤 Chris Adams ( CEO @ eDataSource )

💪 Senior AWS & Python Developer – 4+ years of experience 🎯 Solid Clients: 3netra,HPFS ✅ 100% Refund Guarantee if not satisfied with the work. Committed to delivering the best. I’ll bring your ideas to life and help your business scale efficiently by creating custom AWS solutions, automated workflows, and high-performing backend systems. As an AWS Certified Developer and Python expert with 4+ years of experience, I focus on crafting secure, scalable, and cost-effective solutions for your cloud and backend needs. 🚀 🙌 What I guarantee: ⚡️ Fast and clear communication ⚡️ Flexible availability for ongoing support ⚡️ Scalable, custom cloud solutions built to suit your business ⚡️ Highest quality deliverables with secure architecture Core Expertise: ✅ AWS ✅ Python Development: Backend services,Gen Ai, automation, and scripts ✅ Automation: CI/CD, Terraform, CloudFormation ✅ Microservices and Serverless Architecture ✅ Cloud Infrastructure Optimization ✅ Cost Optimization for AWS ✅ Data Security and Scalable Solutions Why Work With Me? 🚀 With 4+ years of experience in backend development and cloud services, I bring a deep understanding of AWS, Python, and perfect planning to every project. 🔧 I specialize in automation, streamlining workflows, and enhancing operational efficiency to save you time and resources. 💬 Transparent communication and quick delivery of solutions tailored to your needs, all while keeping your business growth in mind. 🔑 Keywords (to help future clients find me): AWS, Python, Backend Development, Cloud Solutions, Automation, Scalable Systems, CI/CD, Terraform, Microservices, Serverless, Cloud Infrastructure, Python Developer, Gen AI, Cloud Expert, Scalable Automation, AWS Lambda, DynamoDB, API Gateway, S3, EC2, Cost Optimization, Secure Backend, Automation Tools

$60K+ earned | 43 projects completed | 4,000+ hours | 4.5+ star average rating I'm a full-stack developer with 10+ years of experience building scalable web applications using .NET (C#) and Angular. I specialize in turning complex business requirements into clean, maintainable software, whether that's a SaaS product from scratch, an enterprise integration, or a performance-critical backend system. How I think: I don't just write code that works. I write code that lasts. Before I touch the keyboard, I think about architecture, separation of concerns, and what happens when this system needs to scale or a new developer joins six months from now. I actively hunt for code smells like redundant null checks, bloated methods, and logic hiding in the wrong layer. I fix them before they become technical debt. Every method should do one thing. Every handler should orchestrate rather than contain business logic. Every feature should ship clean. I've built my own refactoring checklists and code review workflows because quality isn't something I leave to chance. It's a system I follow. I also think like a product builder, not just a developer. I ask "why are we building this?" before "how should we build this?" I've been through the full journey of taking a SaaS product from idea to architecture to real users, so I understand trade-offs between shipping fast and building right. I lean toward shipping first and optimizing second, but never at the cost of a messy foundation. My core stack: .NET / ASP.NET Core, Angular / TypeScript, CQRS + MediatR, Entity Framework Core, SQL Server, SignalR, and RESTful API design. I follow clean architecture principles and write code that future developers (or future me) can actually maintain. What I bring: I've built multi-tenant SaaS platforms, enterprise integrations, and real-time systems from the ground up. I've worked across healthcare, finance, and enterprise operations, solving problems that range from complex data workflows to scalable API architecture. I'm comfortable owning the entire stack and making decisions that hold up long term. Why clients work with me: I ask the right questions first. I use proven architectural patterns, and I'm comfortable owning everything from database schema to frontend UI. I also use AI-assisted development workflows to move faster without sacrificing quality. I communicate clearly, deliver consistently, and treat your project like my own product. Available for: Full-stack development, API development, SaaS architecture, legacy system modernization, frontend builds, database design, and technical consulting. Let's talk about your project. I'd love to understand what you're building.

Top rated GIS Developer | Cloud Architect | Tech Entrepreneur 🌎 Having 4+ years of experience and over 1000+ hours delivered on Upwork with a 100% Job Success score, I build robust, user-friendly GIS applications that turn raw spatial data into clear business insights. These are the industries in which I have created projects as a GIS developer: - SaaS 🌐 - real-estate 🏡 - environment & ecotech🌳 I build end-to-end platforms that merge geospatial intelligence, scalable cloud backends, and modern UIs. From urban analytics & neighborhood profiling to environmental risk mapping and enterprise-grade spatial APIs, my work is where tech meets real-world impact. 🏆 Upwork Top Rated (Top 3% globally) – trusted by international clients for delivering high-quality, cost-optimized solutions. 💡 How I create value for clients and increase ROI by 40%: Smart Cloud Architecture – efficient AWS design, auto-scaling, cost savings. Secure Open-Source Frameworks – GeoServer, PostGIS, Pelias, MapServer, Django, DRF etc. Cost Efficiency – handling backend + GIS + DevOps myself → avoiding unnecessary extra dev hires. 🎯GIS Expertise: Interactive Map Visualization, Mapping app, Routing Problems, Algorithm, Data Scraping, Report generation using geospatial analysis (PDF), Route optimization 🔧 Tech Stack Highlights: 🌐 Backend & Web: Django, DRF, FastAPI, Node.js, Payments system (Stripe) 🗄️ Databases: PostgreSQL + PostGIS, MySQL, MongoDB, AWS Timestream 🗺️ GIS Tools: GeoServer, MapServer, QGIS, GDAL/OGR, TileServer-GL, OSRM, Tileserver-GL, Osmium ☁️ Cloud & DevOps: AWS (EC2, S3, Lambda, RDS, Timestream), Docker, CI/CD, Nginx, Gunicorn 📊 Data & ML: Pandas, NumPy, Scikit-learn, MLflow, AWS MLOps, Spark (basic) 🔒 Security & APIs: Token-based access, role-based permissions, API gateway design 🔍 Datasources: Raster | Vector | Point Clouds, Openstreetmap, Google Maps, GOES/Landsat/Sentinel Hub, SAR data. 💪 With deep expertise in GIS, geospatial mapping, and web development, I deliver solutions faster and at higher quality than most developers out there. 🤝 My goal is to help you scale your business effectively—let’s connect for a chat or call to discuss your challenges and how I can help you achieve your goals!

⭐⭐⭐⭐⭐ ✅ Top Rated by Upwork ✅ 100% Job Success ✅ 13+ Years Experience ✅ 85+ Successfully Completed Projects I help businesses build, fix, modernize, and scale real-world software — not tutorial projects. I’m a Senior .NET Developer & Architect specializing in ERP systems, SaaS platforms, eCommerce, and business-critical web applications. What I actually do • Design & develop ASP.NET / .NET Core applications that scale • Build ERP systems — multi-tenant, role-based, report-heavy • Create clean Angular & React frontends • Customize & extend nopCommerce, Sitecore & Umbraco • Integrate Microsoft Dynamics 365, APIs, payments & third-party services • Modernize and troubleshoot legacy systems that “everyone else touched but no one owned” AI-Augmented Development I actively use modern AI engineering tools including ChatGPT, Claude, GitHub Copilot, Gemini, Cursor, and Windsurf to accelerate development and improve engineering decisions. AI helps me with: ⚡ Faster code development & refactoring 🔍 Debugging and root-cause investigation 🏗️ Architecture exploration and technical planning 🧪 Test generation and code review 📚 Understanding unfamiliar/legacy codebases 🚀 Performance and optimization strategies 💡 Exploring alternative technical approaches But AI is the accelerator — my 13+ years of engineering experience is the driver. I don’t blindly copy AI-generated code. I review, validate, test, secure, and adapt it to the actual architecture, business requirements, and production environment. Why clients stick with me ✔ I think like a business owner, not just a coder ✔ I ask the right questions before writing code ✔ I communicate clearly — no ghosting, no jargon flexing ✔ I deliver maintainable systems, not spaghetti miracles ✔ I use AI to work smarter and faster, without compromising engineering quality If you want predictable delivery, clean architecture, modern AI-assisted development, and someone who treats your product like their own — let’s talk. I don’t chase gigs. I build long-term wins.

Bridging the Gap Between Factory Floors (OT) and Cloud Data Platforms (IT) I am an AWS Certified Cloud Practitioner and Data Engineer with over 5 years of hands-on background in Industrial Automation. I specialize in connecting edge industrial assets (PLCs, SCADA, IoT sensors) with scalable, modern data architectures in the cloud. Whether you need to extract and anonymize healthcare device telemetry, build near-real-time streaming pipelines, or set up cloud data lakes for factory operations, I deliver secure, end-to-end data solutions. I able to work with Different PLC platforms like: Allen beardly, Siemens, Honeywell , Schneider, Phoenix Contact, ABB etc. and SCADA platform like: FT View, Vijeo Citect, VISU+, indusoft, Honeywell etc. I also have a basic Knowledge about Electrical Drawings, Instrumentation and process plants.