Evangelos Yfantis

• - Authored the initial Hono and TanStack Start SDKs and shipped Expo Web support with the open-source SDK team, expanding Clerk's framework ecosystem. Shipped core authentication features: OIDC support, step-up reverification, forced password resets, required MFA, and the Session Token JWT v2 upgrade.

• - Worked on the first ship of Clerk's Billing product.

• - Rebuilt our entire internal pricing infra and migrated thousands of paying customers to the new model and replacing Stripe Hosted checkout with an in-house checkout page.

• - Built the scraping infrastructure for the market-intelligence tool and was promoted to Lead Backend Engineer of the scraping team.

• - Architected a full platform rewrite that cut new-source onboarding from weeks to days, scaling to millions of pages processed daily while cutting server costs.

• - Led the Vue 2 to Vue 3 migration of public sites and introduced Vite into CI/CD, slashing frontend build times from ~16 min to 1-2 min.

• - Designed, built, and deployed custom e-commerce platforms and web apps for small businesses, owning full-stack development and hosting infrastructure.