Кирило

Kyrylo Kostenko
Email: [open contact info](look above in the "contact info" section) Phone: [open contact info](look above in the "contact info" section)

Summary
JavaScript developer with 5 years of experience, primarily focused on front-end development, but
also skilled in various JavaScript technologies. Seeking new opportunities to work on interesting projects
that offer new challenges and support continued growth and learning.

Education
Bachelor in Computer Science and Information Technologies Odessa National Polytechnic Uni-
versity
September 2016 – June 2020

Skills

• Programming Languages: JavaScript (ES6), TypeScript, Node.js

• Frameworks and Libraries: React, Redux, React Router, Vue.js

• APIs and Data: REST API, GraphQL, JWT

• Styling: SASS/SCSS, Flexbox, Bootstrap, Ant Design, Material UI

• Tools: Webpack, Gulp, Git, Jira, Travis CI, Puppeteer, Cheerio

• Databases: PostgreSQL, MSSQL

• Mobile Development: Apache Cordova

• Methodologies: Agile, Scrum

• Testing & QA: Manual testing (desktop & mobile), cross-browser and cross-device testing using
BrowserStack, Appetize, and LambdaTest

• Other: Web Scraping, CI/CD

• English: C1

Work Experience
sPeopleAps, Denmark (Remote) 2020 – Present

• Contributed to the development of the front-end for a CRM web application, focusing on creating a
responsive and user-friendly interface. Built modular pages including data tables, item detail views
(Tickets, Contracts, Customers, etc.), charts, document upload & viewer, rich-text editing, and an
integrated activity planner/calendar. Tech: React, Redux, React Router, TypeScript, GraphQL

• Developed and optimized multiple Node.js scripts and scrapers for efficient data collection. Reworked
a high-volume data collection script to extract, process, and store business information from a pub-
lic API (Denmark’s central business register). Built additional scraping tools for missing data and
implemented custom logging for long-running jobs and scheduled updates. Tech: Node.js, MSSQL,
Puppeteer, Cheerio, REST API
• Developed a planner/dashboard mobile application for CRM users on Android and iOS, improving
access to key features such as activity management, notes, images, and scheduling. Tech: Apache
Cordova

• Performed manual testing of web and mobile applications, including cross-browser and cross-device
validation using BrowserStack, Appetize, and LambdaTest, ensuring consistent functionality and user
experience.

482.Solutions, Ukraine 2019 – 2020

• Participated in the development of a blockchain-based service for issuing securities and paying div-
idends on the Ethereum platform. Improved and maintained the UI for financial instruments and
transactions. Tech: React, Redux, React Router

• Developed the front-end for the organization’s user registration system on Hyperledger Fabric CA,
including authentication and a dashboard for issuing, signing, and verifying digital certificates in
collaboration with backend and blockchain teams. Tech: React, Redux, React Router

• Contributed to an open-source JavaScript library for Decentralized Identifiers (DID) as part of an
international team. Participated in architectural discussions and code reviews, focusing on secure
authentication aligned with W3C DID specifications. Tech: Node.js, TypeScript, DID-JWT