Denys Bykov Email & Phone Number

I developed a fin-tech application for making a profit through joint ownership of real estate and renting it out to third parties. Always learning, testing in practice and developing my knowledge and skills, using only the most innovative technologies for development, I achieved high speed applications for successful business operation, translated all client's specific needs in an easy to use functionality.Successfully completed:1)created and developed architectural… Show more I developed a fin-tech application for making a profit through joint ownership of real estate and renting it out to third parties. Always learning, testing in practice and developing my knowledge and skills, using only the most innovative technologies for development, I achieved high speed applications for successful business operation, translated all client's specific needs in an easy to use functionality.Successfully completed:1)created and developed architectural requirements/selection of technology stack:- all code type-safe with Typescript,- SSR based on ReactJs and NodeJs, also Styled-Components for faster rehydrating for main and dashboard apps,- cloud database used Atlas MongoDB,- Socket.IO and mongo change streams for real-time updates,- mongo bucket system for files for MVP and files storage for files for fast production,- smtp mail service for users notifications,- phone, Google and Telegram authentication/authorization for better user experience,2) security requirements: - validated inputs on the client side with Yup and regexes,- no cookies used just Session Storage for one-page sessions persistence,- type-safe APIs for queries,- tokenization on all routes,- proxy server and TLS,- two-step phone verification with sms,- encryption with bcrypt,- packages audit,3) created task board with time-managing,4) developed front-end and back-end of the main app,5) developed front-end and back-end of the dashboard,6) developed Telegram bot,7) managing Google Services,8) hosting on VPS,9) managing domains/DNS/Nameservers, VPSs,10) administrating Linux Server,11) managing proxy server, certificates, ssh,12) CI/CV pipeline with the help of GitHub and Docker. Show less

Haifa District, Israel

- developing robust, scalable, and efficient mobile applications using React Native, web applications using React and micro services using NodeJs,- thoroughly testing and debugging to ensure high-quality deliverables, troubleshooting and fixing bugs and technical problems,- applications delivery to the App Store and Play Market,- teams management,- planing, task creation and time management,- code reviews and providing constructive feedback to enhance code quality for other… Show more - developing robust, scalable, and efficient mobile applications using React Native, web applications using React and micro services using NodeJs,- thoroughly testing and debugging to ensure high-quality deliverables, troubleshooting and fixing bugs and technical problems,- applications delivery to the App Store and Play Market,- teams management,- planing, task creation and time management,- code reviews and providing constructive feedback to enhance code quality for other developers,- testing the knowledge of new developers,- collaborating with CEO, development, design and QA teams,- selection of technology stack Show less

Ukraine

- development of a mobile application(KenZen) from the scratch,- development of the complex routing iOS-like animations,- development of the Firebase database for work with video content and auth,- managing Google Services to work with video streaming,- utilize Redux state management for predictable and controlled application behavior,- cooperation with design and QA teams.

Kyiv, Ukraine

Development of the online store department domain for The Kooples distributor. - development using Vue library,- state management using Vuex,- training and managing Junior Developer,- cooperation with back-end and QA teams.

Manchester, England, United Kingdom

- creation of the application to measure time spent on design furniture design tasks using Expo library to create hybrid(iOS and Android) React Native application,- utilizing Redux state management and Redux-Thunk for asynchronous queries,- development cloud Firebase database and API for queries, - testing and debugging the app for delivery,- application delivery to the App Store and the Google Play Market.