Зефир Мулдаш

I’m a Senior PHP Full-Stack Developer with 9+ years of experience in backend and full-stack development for e-commerce, fintech, transportation, EdTech, warehouse systems, and internal CRMs. I specialize in getting up to speed fast on complex business logic and bringing troubled systems to a stable state.

At Toolkeep warehouse SaaS, I developed and maintained inventory tracking and internal warehouse operations with a backend built on Yii2/PHP and MySQL. I worked as a senior backend/full-stack developer—analyzing undocumented legacy code, stabilizing business logic, designing new modules, and setting up releases with Docker and GitHub Actions.

I’ve consistently improved reliability and performance: refactoring legacy inventory accounting modules to Yii2, fixing ~100 bugs across warehouse business logic, implementing localization through Crowdin, and refining mobile scenarios on Expo Go/React with push notifications and correct status updates. I also optimized CI/CD to reduce manual release verification and reduced delays for new language versions from weeks to 3–4 days.

Earlier, at Flip.kz and SimbirSoft, I developed and maintained large e-commerce and custom project systems, including admin panels, dashboards, and integrations. I enjoy architectural refactoring of legacy systems, API development (REST/GraphQL), performance optimization, caching, CI/CD, and team-based development.