- Replaced ad-hoc hooks and component-level API calls with Redux Toolkit, centralizing state management and improving reliability and maintainability of a customer-facing analytics UI. - Held primary ownership of UI architecture and implementation, leading all technical decisions and execution. - Mentored a mid-level engineer across UI, ETL pipelines, data validation, and overall system architecture. - Delivered a pioneering B2B integration with Meta, enabling conversion tracking and increasing engagement with new business partners. - Initiated the TikTok integration project, building tracking and analytics infrastructure and transitioning it to another team. - As sole owner of the JS SDK, implemented visitor and session tracking (breaking change), improved client adoption, maintained docs, and hosted it on company GitHub. - Maintained the analytics UI and added a high-contrast black/white theme, improving accessibility for visually impaired users. - Consulted senior engineers on UI design and best practices. - Implemented a complete application redesign in the microfrontend portal, enhancing UX and long-term maintainability. - Adopted C# for backend services, and later Kotlin with the team, launching a new Kotlin-based service to production within four months. - Built an integration with a third-party churn prediction model, incorporating predictive insights into analytics pipelines. - Built a ClickHouse analytics pipeline for external clients, combining batch-style historical aggregation with event-driven live updates, supporting deduplication, refeeds, and multi-level time buckets. Built and ran a ClickHouse-based data warehouse at billion-row scale, delivering custom ETL pipelines, automated validation and source reconciliation, storage optimizations, and full ownership of a customer-facing analytics UI. Technologies: TypeScript, React, Redux, Kotlin, C#, Python, ClickHouse, MongoDB, Kafka, Spring, ETL, Distributed Systems

- Checking student's projects; - Conducting educational calls; - Discussing and explaining difficult topics. - Pair programming. Achievements: - Mentored 5+ individuals who successfully found jobs - Enhanced quality and presentation of course projects Stack: TypeScript, JavaScript, React, Redux, NodeJS, Gulp, Webpack, Express,, HTML5, CSS, SCSS, LESS, BEM, GIT

- Сhecking student assignments; - Conducting consultations with the analysis of errors. Achievements: - Mentored 15+ individuals, contributing to their successful job placement - Significantly improved projects and tasks by proactively identifying and reporting issues Stack: TypeScript, JavaScript, React, Redux, NodeJS, Gulp, Webpack, Express,, HTML5, CSS, SCSS, LESS, BEM, GIT

Responsibilities: - Refactoring legacy code, migrating to new technologies and platforms (e.g., migrating libraries and microservices to the NestJS monorepo); - Developing new functionality; - Participating in planning and decision-making regarding new features; - Regularly reviewing merge requests and identifying relevant and best solutions for the current situation; - Generating reports for the sales department; - Developing website parsers, Telegram bots, and console utilities; - Maintaining documentation, breaking down large milestones (EPICs) into tasks, documenting releases; - Writing integration and unit tests; - Deploying completed EPICs. Technologies: - Writing styles using the CSS modules system and the Stylus preprocessor; - Using the BEM methodology; - HTML/PHP layout; - Frontend implementation based on the React library; - Webpack for module building; - Using Redux for application state management, redux-thunk for asynchronous actions; - Routing in React applications using FLow-Router and React-Router; - Server-side development with NodeJS and Python3; - Using Socket.IO to create chats and other applications that exchange data in real time; - Using RabbitMQ as a message broker; - Server-side development of full-stack applications based on Meteor, Hapi, Express, and NestJs; - Using MongoDB, PostqreSQL, Cassandra, ElasticSearch, and Redis as databases; - Implementation of CI/CL tests; - Database migration; - Implementation of ORM technology using TypeScript and CoffeScript; - Working with microservice architecture and events; - Using Apache Hive and Secor DB; - Console Git for version control; - Linux and SSH for connecting to a remote server. Android App Development in Kotlin (May 2020 - November 2020) Responsibilities: - Legacy code refactoring (optimization, implementation of the latest language and platform features (e.g., migrating to coroutines, data binding, MVVM); - New functionality development; - Participation in planning and decision-making regarding new features; - Regular merge request review sessions and searching for relevant and best solutions for the current situation; Technologies: - Implementation of socket-based server interaction; - Implementation of a custom library for server interaction; - Implementation of MVC, MVVM, and MvRx architectures; - Use of Dagger 2 and Kodein for DI; - Use of Realm and Room as databases; - Use of Gson and Moshi for working with JSON; - Processing and retrieving data using RxJava, Coroutines, and ViewModel; - For working with sheets use RecyclerView, Epoxy.

- Participated in a pilot program for U.S. students - Contributed to improving initial course materials - Conducted code reviews of students’ assignments Achievements: - Developed automated tools to speed up the code review process - Helped polish and refine tasks and learning materials Stack: JavaScript, HTML5, LESS, BEM, NodeJS, Gulp, Webpack, Figma, React, Git

- Participated in a pilot program - Client scripting with JS, jQuery; - Performance optimization; - Bundling assets with Webpack, Gulp, usage of ES6+ features; - Creating valid, semantics and logical markup using HTML/Pug; - Building adaptive layouts using float, flexbox, grid following BEM methodology; - Styling with CSS, LESS, SASS, SCSS; - Working with Photoshop, Zeplin, Figma; - Supporting browsers: Chrome, Mozilla Firefox, Opera, Edge, IE11, Safari; - Refactoring legacy-code; - Building email layouts. Stack: JavaScript, HTML5, PUG, LESS, SCSS, SASS, NodeJS, Gulp, Webpack, BEM, Figma, Zeplin

- PHP scripting and automatization; - Performing marketing research; - Operative management; - Systematization of corporate information; - Working with Google Analytics, Yandex.metrika. Stack: PHP, JavaScript, MySQL, Google Analytics, yandex.metrika