Koray E.

I build cross-platform products that run everywhere, from smartphones to bare metal. Over a decade as technical lead and IC, I get new ventures to market, untangle systems under scale, and keep teams shipping through tight feedback, predictable releases, and metric-driven decisions.

Fast-growing Korean QSR. Built mobile and embedded stack including scan-order-pay flow via App Clip and Rust printer service to convert anonymous deliveries into identified, enrolled customers.

TypeScript Rust React Native NixOS drizzle workerd Cloudflare Effect Hono Zustand Tamagui fastlane Vitest Stripe

Cross-platform community toolkit spanning Chromium start pages and React Native app. Raised $2M with Barça Vision partners. Led product and co-led engineering from concept to production.

TypeScript React Native React Express GraphQL Tamagui Storybook Zustand fastlane Terraform Firebase Chrome Extensions

K-12 edtech platform. Stabilized 4-year-old codebase, cleared technical debt, added telemetry and testing, hardened serverless functions, and mentored the team.

TypeScript React React Query Next.js Koa Tailwind Storybook MongoDB Terraform Google Cloud

Social predictions app where users discuss news, make predictions, and redeem prizes. Built from scratch; became 2017 chart-topper in Turkey with ~1M installs, ~300K MAU, 4.8/5 stars (~110K ratings).

JavaScript React Apache Cordova PHP Redux Redis MySQL DigitalOcean

hono-tanstack-query	TanStack Query wrapper for Hono RPC endpoints.	TypeScript TanStack Query React
ch9329-rs	Rust drivers for CH9329 keyboard emulation chips.	Rust
Medkai	Mobile scanner and cabinet for German meds, with answers on demand.	TypeScript drizzle workerd OpenNext React Rust Cloudflare Workers Vitest Playwright NixOS

Koray E.

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