Sergei Chashchin

Designed and implemented a modular payment layer for Stripe, Xendit, and Airwallex, enabling multi-provider routing and production launches in international markets. Migrated approximately 60% of legacy AngularJS code to modern Angular and built automated localization workflows.

Led product and technical direction for an internal client onboarding solution and built an automation platform using Telegram and CRM. Improved reliability of a Web3 platform with centralized error tracking and structured logging, and built an MCP server for ChatGPT to automate Notion operations.

Stabilized critical payment flows and designed a modular payment architecture with Stripe. Introduced centralized error tracking and structured logging, and built a two-way Google Calendar integration to synchronize bookings.

Developed and launched customer-facing features using Nuxt, Vue, TypeScript, and TSX. Redesigned complex user interfaces, led introduction of Cypress end-to-end testing, and integrated Sentry for frontend error diagnostics.

Delivered frontend and full-stack products for international clients, including a digital billboard management CRM, an internal meeting management platform, a food delivery platform, a landing page generation platform, and corporate cloud storage. Worked directly with clients to define requirements and deliver products from planning to production.

Redesigned key mobile banking interfaces using responsive design principles. Modernized legacy Angular code and frontend architecture, and conducted code reviews to improve quality standards.

Studied land and property relations from 2011 to 2013.

Studied computing machines and network complexes from 2009 to 2011, and land and property relations from 2011 to 2013.