SviatoslavShubin

Experience

Six years, three companies, one focus.

1. T1 Group

   Senior Frontend Developer

   Sep 2025 - Present

   Moscow, Russia · Remote

   AI / ML Platform

   • Designed the architecture and built a React platform for manual data annotation and dataset preparation for ML models at VTB Bank, an international bank serving 30M+ customers.
   • Improved page rendering performance by 20% by reducing dependencies in the React component tree with React Hooks and Reselect.
   • Implemented virtualization with TanStack React Virtual for large datasets and optimized data fetching with Zustand and React Query, enabling server-side request caching and flexible data synchronization.
   • Enhanced the Webpack configuration and rslib module compatibility, enabling migration to the latest version of the bank's design system.
   • Integrated AI agents and generative AI to accelerate UI component development and automate repetitive engineering tasks.

   Label Studio

   • Developed a snapshot-based data export with React and Ant Design and background processing, enabling large dataset exports without blocking user workflows.
   • Developed APIs with Python, Django, Flask and FastAPI to configure file operation restrictions, working as a full-stack developer.
   • Built an Ant Design pagination plugin for large datasets and implemented both manual and automatic data loading.
   • Fixed issues with Ant Design modal components, improving overall application stability.

   Machine Learning Model Dashboards

   • Developed a dashboard for visualizing ML model execution data with Mantine UI components.
   • Implemented CRUD operations and forms for managing model execution scenarios.
   • Conducted code reviews and Redux state refactoring to prepare the project for the MVP stage.
   • Implemented search across model execution scenarios and parameters.

   LLM / AI Chat for VTB Bank Internal Portal

   • Configured Webpack Module Federation for production and integrated the microfrontend into the host application.
   • Improved the application's UI, functionality and stability by resolving critical bugs and shipping key enhancements.
   • Configured Kubernetes environment variables and runtime parameters for the application container.
   • Reduced initial rendering time by 1 second.
   • Resolved UI/UX inconsistencies and coordinated design changes with the product designer.
   • Optimized and maintained the Docker configuration.

2. iFellow

   Frontend Developer

   Feb 2023 - Sep 2025

   Moscow, Russia · Remote

   Auto Loan Module, Sberbank Online

   • Developed a React, Redux and TypeScript module for auto loan applications and vehicle collateral management on a banking platform serving 100M+ customers.
   • Reduced the loan application process from 40 to 15 minutes.
   • Improved the UX/UI of the auto loan application flow, increasing the number of customers completing applications online without visiting a branch by 22%.
   • Simplified the application process, contributing to a 31% increase in bank approval rates.
   • Migrated the application to internal enterprise libraries, eliminating dependencies on external vendors.
   • Integrated a CMS to streamline content management and improve time-to-market.
   • Implemented product analytics to track user interactions and gain deeper insights into customer behavior.
   • Acted as Lead Frontend Developer: code reviews, technical assignment evaluation, onboarding and mentoring of frontend developers.
   • Developed an additional auto loan insurance application page within SBOL.
   • Implemented a new auto loan details page in the customer's personal account.
   • Set up E2E testing with Cypress and parallel test execution across SBOL and SBOL.Pro environments.

   Vehicle Collateral Module, Sberbank Online

   • Developed a React, Redux and TypeScript module for pledging vehicles as collateral during the auto loan application and delivered it to production, contributing to a 20% increase in loan disbursements.
   • Implemented product analytics to track user interactions and monitor user behavior.
   • Integrated auto loan data with the CRM system, enabling call center operators to quickly access customers' loan information.
   • Enhanced a Node.js / Express mock server for local development and simulation of JSON API responses.

   BI & MDM Platform, Sberbank Financial Department

   • Replaced a matrix-based data structure with JavaScript Map, optimizing chart rendering and data recalculation.
   • Implemented the Pub/Sub pattern for flexible communication between application plugins.
   • Developed plugins for number handling, formatting, styling and cell merging.
   • Built forms for accounting entries and budget management with React Hook Form.
   • Developed Excel-like data tables supporting 50,000+ rows and optimized rendering through virtualization with react-window.

   Drag-and-Drop Form Builder

   • Implemented the core of a financial form builder with dnd-kit and reusable components, enabling financial planning teams to create custom forms from a predefined component library.

   Design System

   • Designed and developed an internal design system with React and TypeScript, consisting of 50+ reusable UI components.
   • Contributed to the development and packaging of the design system as an npm module.
   • Supported integration of the design system across neighboring teams, reducing business feature development time by 25% through reusable components and standardized UI patterns.
   • Added unit tests with 61% coverage and maintained component documentation in Storybook.

3. UTair Group

   Frontend Developer

   Feb 2021 - Feb 2023

   Krasnodar, Russia · Hybrid

   Call Center Feedback Widget

   • Developed a React real-time chat widget for customer support and integrated it into the airline's official website, increasing the operator response rate by 20%.
   • Implemented Sentry monitoring, reducing the time to detect and resolve production issues by approximately 50%.
   • Contributed to CI/CD setup and configured the Webpack production build.
   • Designed UI layouts in Figma in the absence of a dedicated UI/UX designer, keeping development unblocked.
   • Created the Docker configuration for the frontend application.
   • Developed unit tests with Jest, Enzyme and React Testing Library.

   Real-Time Chat & Call Center CRM

   • Eliminated duplicate Axios requests, reducing the time to display customer flight information.
   • Resolved WebRTC telephony issues so operators call customers directly from the app, reducing call handling time by 32% compared with the external phone channel.
   • Enhanced the real-time chat between operators and customers.
   • Redesigned application sections in Figma and improved rendering performance by 30% through lazy loading and React optimization.
   • Migrated state management from Redux to Redux Toolkit.
   • Implemented request caching by migrating from Axios to React Query, reducing code duplication by 25%.
   • Implemented Cypress E2E testing with automated daily runs, reducing the time to detect regressions.