Kudratillo I.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.

Kudratillo is a full stack developer with a solid experience on Android, iOS, Java, Spring, Netty, PostgreSQL, Angular, ActiveJ, Vert.x, reactive programming. Project experience: Messenger, Audio/Video calls, Listings, US RETS, MLS, Calculators, Personal Cabinet (services, balance), Detailed history of user activity, etc Kudratillo is a developer with 4 years of experience in backend development in Koltin/Java+Postgres and 6+ years of experience in Java software development. Kudratillo loves to write reactive backend services. Kudratillo also developed admin panels, messenger web apps in Angular and Typescript. Kudratillo recently wrote a backend in microservices architecture in Kotlin using young reactive and high-load framework ActiveJ and Vert.x. It makes use of RPC with byte level serialization other than JSON. Kudratillo also made other Kotlin projects. Kudratillo developed backend for a messenger like Telegram/WhatsApp in Java. It included features such as private, group chats and channels; sending file, photo, voice, video, location; search people and messages; push notifications. Project connection is built on top of websockets with custom byte-level serialization and encrypted using AES/DH key sharing. Kudratillo used Netty and Postgres in this project. Kudratillo also developed API backend for personal cabinet for customers of a cellular company. It also includes many features and challenges such as preparing customer's activity log for a period based on customer's order, dynamic properties of tariffs. Kudratillo have developed REST APIs using Java Spring 5 WebFlux with beautiful Swagger & Redoc documentations. Kudratillo mostly use PostgreSQL as database since it offers very powerful capabilities and yet is free. Kudratillo have experienced on making pl/pgsql and sql functions. Kudratillo have a knowledge of optimization, normalization, denormalization of databases. Kudratillo can deliver database from scratch. Experience: - Messenger App on iOS and its backend on Java with custom protocol to exchange data over WebSocket - Java Spring 5 WebFlux API backend for mobile app of personal cabinet of cellular and internet provider users - No-code website to create websites for US realtors (RETS, MLS) to sell houses (as a team member) - Ionic hybrid app for calendar like event management app - Android apps for internal use of a company: Task Management app, Rate Coworker app, Colleague Birthdays app - Informational app for Insurance Company which fetches data from server and saves locally. It also includes insurance calculators