Sergii Severynov

Promoted to Team Lead at Lano, leading 5 developers on a global payroll platform. Led a major frontend refactor improving scalability and onboarding, introduced code checks and shared components, and contributed to high-level architecture and API design in a Rails + React monorepo. Also worked on backend features, enhanced frontend performance with TanStack Query and Zod, and mentored engineers to drive quality and collaboration.

Led frontend and cross-functional development of a multi-tenant, multi-language educational platform. Built a modular system with 6 apps and 7 microservices, reusable components, and a standalone Next.js app. Completed a full accessibility refactor (100% Google compliance) and delivered advanced features like live chat, collaboration, and payments. Also launched Web3, telehealth, and marketplace projects, while contributing to hiring, mentoring, and feature planning.

Developed production-grade frontend apps, including a travel PWA with real-time updates, offline support, and integrations (Expedia, Booking). Built a crypto trend platform with SEO-optimized SSR and data visualizations, and designed a fintech form engine with modular, reusable UI components. Mentored interns, supported tech hiring, and contributed to internal knowledge sharing through meetups and code reviews.