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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 )

Java Spring Developer with over 15+ years of experience building scalable, high-performance solutions across diverse industries. Technical Expertise ✅Spring Ecosystem: Spring Boot, Spring Batch, Spring Cloud, Spring Security, Spring AOP, Spring MVC, JSP, Thymeleaf. ✅ AI : Claude , Codex , RAG ,Integration with OpenAI ✅Microservices & APIs: Microservices architecture, RESTful APIs. ✅Messaging & Event-Driven Systems: Apache Kafka, WebSocket, STOMP, Socket IO ✅Cloud Integration: AWS (ECS Fargate, S3, EC2, ALB, RDS). ✅Database Design: SQL (MySQL, Oracle, Yugabyte, PostgreSQL, MS SQL Server) ✅DevOps & Containers: CI/CD pipelines, Jenkins, Docker, Podman, Kubernetes ✅Search & Caching: Elasticsearch, Redis, Terracotta Caching ✅System Integration & Legacy Modernization: Seamlessly integrate modern applications with legacy systems ✅Frameworks & Tools: JHipster, Keycloak, Flowable, JBPM, Flyway, MapStruct, JavaFX, Java Swing ✅CMS Solutions: Documentum, Alfresco ✅XML & Web Services: SOAP, RESTful services ✅Reporting Tools: Crystal Reports, JasperReports, BIRT ✅Testing Framework/Tools: Junit5,Selenium,JMeter

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!

Hi, I am a .Net developer having 12+ years of professional experience with a wide range of technologies and Frameworks. I am proficient with the following technology stack: ✅ .Net Framework, Asp.net Core , ✅ Xamarin Expert ✅ MAUI ✅ Angular Expert ✅ NativeScript-Angular.JS/Vue.JS ✅ Ionic/Angular ✅ Apache Cordova ✅ Capacitor ✅ Node.JS ✅ Typescript, SAAS & LESS ✅ Azure , AWS, EC2, lambda, S3, RDS, Cloud Front, Cloudformation, Rekognition, Kinesis, translate, Amplify and Elasticsearch. ✅ MySQL, Oracle, MSSQL server, PostgreSQL MongoDB, Dynamo ✅ Maven, Ant, Jenkins, Circle CI, CI/CD in Bitbucket and Gitlab ✅ Docker CLI, docker-compose, Orchestration with Kubernetes, Docker Swarm, and Amazon ECS I have recently completed an ongoing project so currently, I am open for new engagements and can be available for 40-50 hours per week.

✅ 10+ years experience. ✅ 390 + hours worked ✅ Exceptional English Conversation skills ✅ 100% Quality Backend developer specialised in Java, Python, Gen AI and Spring Boot, with a proven track record of delivering scalable, high-performance solutions for businesses. Over the years, I have worked with leading MNCs like Walmart Labs and Samsung, as well as dynamic startups such as OYO Rooms and 1mg, to build robust backend systems that power seamless user experiences. Front-end developer, with a solid 9+ years of experience and a proven track record, I am dedicated to implementing best practices and leveraging the latest technologies to deliver exceptional results. Backend developer with 10+ years of professional experience along with 2+ years as a full stack developer, specialising in: ✔ Java, Spring Boot, Spring Data JPA, Spring Security, Oauth2 ✔️ Gen AI ✔ Typescript, Angular, Angular Material ✔ Javascript Working with me, you will: ✔ Get fast response and clear communication ✔ Beautiful and reusable code, intuitive, and functional interface applying all the best practices ✔ Developer familiar with DevOps practices and CI/CD pipelines. About My Skills: Backend: ✅ JAVA, Java EE, JUnits ✅ Gen AI ✅ Spring Frameworks (Spring Boot, Spring MVC, Spring Data JPA, Spring Security, etc) ✅ Spring Security, Oauth2, OpenID Connect (OIDC) ✅ Hibernate ✅ Servlet, JUnit, Jackson, Gson, Concurrency in Java ✅ REST API, Swagger/OpenAPI, Quartz, Lombok, REST, JSON, XML ✅ Apache Kafka ✅ Microservices CI/CD (DevOps) ✅ GIT, GitHub, GitLab ✅ GitHub Actions ✅ Docker ✅ Kubernetes ✅ Jenkins ✅ REST API ✅ AWS ✅ GKE Frontend: ✅ JavaScript, TypeScript ✅ React, Redux, Redux Toolkit, Saga, Thunk, Storybook ✅ Angular (2+), RxJS, NgRx ✅ Jest, Karma, Jasmine, Enzyme, React Testing Library, Cypress ✅ Javascript ✅ HTML, CSS, Bootstrap ✅ TailwindCSS Others: Software/tools/others; ✅ Database (DynamoDb, Azure SQL, Aure Cosmos, MySQL, Oracle, SQL SERVER) ✅ Maven, Gradle, TFS ✅ Oracle SQL Developer ✅ Amazon Cognito ✅ AWS Services ✅ GCP (Google Cloud Platform) ✅ Stripe ✅ Azure DevOps ✅ Nodejs (Express, NPM) ✅ Visual Studio, Visual Studio Code ✅ IntelliJ, eclipse, Atom, Android Studio ✅ mRemoteNG ✅ Tomcat ✅ Postman, SoapUI ✅ Unix, Linux ✅ JIRA, ClickUp Key Highlights: Expertise in backend development for websites and applications using Java and Spring Boot. Proficient in designing scalable, high-performance systems with PostgreSQL, Kafka, and Redis. Delivered business-initiated projects on time, contributing to organizational growth and efficiency. Skilled in troubleshooting, performance tuning, and ensuring system reliability using tools like Splunk. Adept at collaborating with cross-functional teams to solve complex problems and achieve project goals. Education: Graduated from the Indian Institute of Information Technology, Allahabad (IIIT-A), with a specialization in Information Technology. I have worked with high-profile Organizations in my career, including the following to illustrate some of them: ✔ Walmart Labs ✔ OYO Rooms ✔ Tata 1MG ✔ Samsung R&D

❇️ Senior Solution Architect & Full-Stack Engineering Leader | 🌍 16+ Years Experience | 🚀 100+ Global Projects Delivered I specialize in architecting and delivering high-performance, scalable, and intelligent software systems for startups, scale-ups, and enterprise clients worldwide. With over 16 years of hands-on experience, I operate across the full technology spectrum—combining modern frontend frameworks, robust backend architectures, and cloud-native infrastructure to transform complex ideas into production-grade applications. My core strength lies in designing end-to-end solutions—from rapid MVP development to large-scale enterprise platforms, with a strong focus on performance, scalability, and user-centric design. 🔷 Core Expertise ✔️ Enterprise Architecture & Full-Stack Leadership Designing scalable, maintainable systems across web, mobile, and cloud environments. ✔️ Frontend Engineering Excellence React.js, Next.js, Angular, TypeScript Modern UI systems (MUI, Bootstrap) High-performance, responsive, and interactive interfaces ✔️ Backend & API Architecture Node.js (Express, LoopBack), Java (Spring), Python (Django) REST & GraphQL (Apollo) APIs Distributed systems & microservices architecture ✔️ Geospatial & Advanced Mapping Systems CesiumJS (3D Globe), OpenLayers, ArcGIS, Google Maps, Mapbox Real-time geospatial data visualization and processing ✔️ Database & Data Engineering Relational: Oracle, PostgreSQL, MySQL, SQL Server NoSQL: MongoDB, Elasticsearch, AWS DynamoDB High-performance querying and data modeling 🔷 Cloud & DevOps Expertise ✔️ Cloud-Native Architecture AWS (Primary): Lambda, API Gateway, S3, Cognito, Kinesis, Athena CI/CD pipelines using CodePipeline, CodeBuild, CodeDeploy Elastic Beanstalk & serverless application deployment ✔️ Multi-Cloud Capabilities Google Cloud (App Engine, Compute Engine, Cloud Functions) Microsoft Azure (Pipelines, Boards, Repos) ✔️ Version Control & Collaboration GitHub, GitLab, Bitbucket, AWS CodeCommit, Azure Repos 🔷 Integrations & Enterprise Systems ✔️ API Integrations (Extensive Experience) PayPal, Stripe, Zoom, QuickBooks, Twilio, SendGrid, WhatsApp (Meta), Uber, Lyft, Zapier, Expensify, and more. ✔️ Authentication & Security (SSO / OAuth) Auth0, Okta, AWS Cognito, Firebase, Azure AD, and major social platforms. ✔️ CRM, ERP & CMS Systems Zoho, Odoo, Apache OFBiz, HippoCMS ✔️ Data Visualization & Reporting Power BI, Jasper, BIRT, Sisense, Highcharts, Recharts, Chart.js, AMCharts 🔷 Delivery Approach I bring a solution architect’s mindset to every engagement: 📌 Deep technical discovery & architecture planning ⚡ Agile, milestone-driven execution 📈 Scalable, future-ready system design 💬 Clear, consistent stakeholder communication I partner with organizations that require precision, scalability, and long-term reliability in their technology stack. If you’re looking for a senior architect who can lead, design, and deliver complex systems end-to-end, I bring the expertise and execution discipline to turn vision into reality. -- Nikhil Mahajan