Sumit K.Private profile: Upwork shows its earnings only to signed-in members, so we check it every few weeks, not daily. MRR here is a rough estimate (Upwork's six-month earnings ÷ months active). Last read Nov 5, 2026.

💫 About Me: 💎 Full Stack Experience: 10+ years in web development and a Full Stack Developer. 💎 Retool Experience: 4+ Years of Retool Developer Experience. 💎 Developing Data Visualization Dashboards. 💎 Agile methodology : Follow Agile methodology in my work, combining SCRUM and Kanban. 💎 Faster result: Faster result as outcome of the work. 💎 Responsiveness: Proactive customer support until you are completely satisfied. 💎 Productivity: Ready to work hard providing effort of 40-60 hrs. a week. 💎 Coding Metrics: Clean, Maintainable, Well Commented and Extensible code. 💎 Coding Practice: Following Industry best Coding standards & Practices, programming principles and design patterns. 💎 Analyzing project inside out before writing a single line of code. 💎 Very Serious about my deadlines and work. 💎 100% Quality work for any projects. 💎 Client Satisfaction is our Priority 💎 Expert in TDD and BDD. ------------------------------- 💫 Domain Expertise: ------------------------------- 🔥 FinTech 🔥 Travel & Hospitality 🔥 Ecommerce 🔥 Restaurant business 🔥 Bookings 🔥 Content Management Systems 🔥 Marketplaces 🔥 Logistics & Supply chain ------------------------------- 💫 Front-End Stack: ------------------------------- ❇ General UI/UX stack 🔥 HTML/HTML5 🔥 CSS 🔥 Javascript 🔥 Typescript 🔥 AJAX 🔥 JQuery ❇ React Stack: 🔥 React 🔥 React State Manager: Redux 🔥 React Framework: NextJS 🔥 Redux Saga 🔥 Redux Toolkit 🔥 React Middleware: Redux Thunk ❇ CSS Stack: 🔥 CSS 🔥 SASS 🔥 LESS 🔥 Bootstrap 🔥 Material UI 🔥 Font Awesome ❇ Compiler: Babel ❇ Testing: Karma/Jasmine/Protractor ❇ Build: Webpack ------------------------------- 💫 Back-End Stack: ------------------------------- ❇ Node.js Stack: 🔥 Framework: Express, Meteor 🔥 Language: Javascript/Typescript 🔥 Database Tools/ORM/Libraries: KnexJS, Sequelize, PgClient 🔥 Network: Socket.iO 🔥 Audio/Video: ffmpeg, audioconnect, opencv4nodeJS 🔥 Test framework: Mocha, Chai, Jest, TestDouble 🔥 Logger: Winston / Morgan 🔥 Security: Passport.js ❇ Java Stack: 🔥 Language: Java 🔥 Framework: Spring, Spring boot 🔥 ORM: Hibernate, JPA 🔥 Test Framework: Junit, TestNG, Selenium, Cucumber 🔥 RPC Framework: GRPC 🔥 Logger: Log4j, Slf4j 🔥 Server: Apache Tomcat, IBM Websphere, Jboss/WildFly, Weblogic 🔥 Build Tool: Maven, Gradle 🔥 Security: Spring security ❇ Message Broker: RabbitMQ, Redis, Kafka ❇ Database: MySQL, Oracle, PostgreSQL, IBM DB2 ❇ Graph Databases: Neo4j ❇ Graph Query Language: GraphQL ❇ Web Services: REST, SOAP ❇ Container: Docker ❇ Versioning: Git/Github/GitLab ❇ Documentation: Swagger ❇ API integrations ✔️Social Marketing API: Google API, Twitter API, Facebook API, Instagram API ✔️Payment Gateways API: Stripe, Pay Pаl ✔️ SMS Gateways API: Twillio API ✔️ Messaging Services: Slack API ❇ Search results: ElasticSearch / Algolia ❇ Agile tools: ✔️ Trello ✔️ JIRA ✔️ Notion ✔️ Asana ✔️ Airtable ❇ Agile Methodologies: ✔️ Scrum ✔️ Kanban ❇ Cloud: ✔️ Amazon Web Services (AWS) ✔️ Google Cloud ❇ AI Platforms: Nyckel ❇ Low Code Platforms: Retool, N8N, Bubble ------------------------------- 💫 Retool Experience: ------------------------------- 🔥 Building Dashboards, Multi-page Apps and handled Query parameter scenarios. 🔥 Development of UI Layouts, Forms and Components. 🔥 Wiring Queries, Transformers and Page performance overheads. 🔥 Developing Deep linking Apps. 🔥 Developing Data Visualization Dashboards. 🔥 Experience in Retool AI & Vector Database. 🔥 Worked with Retool Modules. 🔥 Able to use Query Library for Generalization of Queries. 🔥 Handling Version control scenarios. 🔥 Handling user authentication and permission. 🔥 Configuring Retool staging and production Environment. ---------------------------------- ❇ Integrated Retool with: ---------------------------------- 🛠 Google Sheets. 🛠 PostgreSQL. 🛠 MySQL. 🛠 MongoDB. 🛠 GraphQL. 🛠 AWS S3. 🛠 REST API. 🛠 SendGrid. 🛠 Twillio. 🛠 Stripe. 🛠 Slack. 🛠 Airtable. 🛠 n8n.