Leonid Ionov

Frontend engineer on a crypto-to-fiat payments platform (12M+ users, 500+ partners). Built the frontend for the Forethought AI support rollout (chat deflection 8%→68%, ~€50K saved) and the event-tracking layer behind company-wide A/B testing (5–7M+ events/month). Delivered Trust Wallet recurring payments, technical SEO (record 116K organic sessions in a quarter), the anti-fraud admin migration, Cloudflare Turnstile bot protection, and integrations: Apple Pay, BLIK, SEPA, Telegram Wallet, Ledger, MetaMask.

React micro-frontend developer on Pearson's Connexus online-school platform (10M+ users), replacing legacy .NET modules. Rebuilt the Planner (the lesson/event calendar) as a React app — date and view switching went from seconds to near-instant, time-zone changes from minutes to instant — and added the full accessibility the legacy version lacked. Built the Assessment-Management app end-to-end with near-real-time sync, plus an AI-powered Question Generator that drafts questions from course material.

Built a production-ready Next.js parking application, improving its accessibility and reliability, and contributed to the shared modular frontend architecture used across projects. Stack: React, TypeScript, Next.js.