kirilltsonev

Built and optimized complex, cross-page data logic using Viem and Wagmi, involving advanced filtering, sorting, and transformation of nested datasets. Developed responsive 'Activity' and 'Portfolio' pages with virtualized dropdown tables, animated charts (line/donut), and multi-input filter systems synced with URL parameters. Delivered full-featured airdrop programs, including custom components for time-gated and recurring token distribution logic, leaderboards, and distribution history tracking. Migrated state management from Pullstate to Zustand and transitioned the API layer to React Query, improving data handling and performance. Integrated E2E testing with Playwright in a Dockerized environment simulating blockchain nodes for real trading scenarios. Implemented PostHog analytics for feature tracking and built custom dashboards to monitor usage patterns and UX insights. Worked across the stack with Viem and Wagmi for wallet/contract interactions, solver/market maker selection logic, and integration of multiple crypto APIs (Dune, Binance, GoPlus, Coingecko). Used AI-assisted tools to accelerate development, refactoring, testing, and documentation workflows. Collaborated closely with designers, QA, and engineers across the stack to deliver production-grade features in a fast-paced Web3 environment.

Built features for a travel product enabling users to purchase airline tickets, integrating Duffel API for flight data and Stripe API for secure payments. Contributed to a full redesign and modernization of a radio company’s website, focusing on responsiveness, performance, and maintainability. Participated in code reviews, wrote automated tests, and collaborated closely with designers, back-end developers, and QA to deliver high-quality features. Worked on DevOps tasks (Docker, CI/CD configs for Microsoft Azure) and ensured robust fallbacks for legacy browsers, devices, browser locales. Helped maintain coding standards and contributed to a smooth and efficient development workflow across multiple cross-functional teams.

Contributed to a US healthcare platform with a focus on accessibility, HIPAA compliance, and user-centered design. Built complex forms and data visualizations, along with logic for scheduling, tracking, and managing medical appointments. Developed search and filtering features for doctors based on specialization, experience, and availability. Implemented a personalized user dashboard displaying appointment history, medical info, and user-specific actions. Collaborated with designers, QA, and back-end teams to deliver secure, high-quality features aligned with regulatory standards. Participated in code reviews, testing, and cross-functional discussions to ensure quality and security throughout the development lifecycle.

Worked on multiple e-commerce products, contributing to both new feature development and large-scale refactoring of legacy codebases. Improved code quality, maintainability, and performance by aligning older projects with modern best practices and design patterns. Focused on responsive, performant UI development and collaborated with cross-functional teams to deliver scalable, user-friendly solutions. Regularly participated in code reviews, testing, and optimization efforts to ensure high-quality releases across platforms.