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Zephyr Muldash

@zephyrmuldash

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Senior PHP full-stack developer focused on stabilizing legacy systems and building scalable APIs.

Kazakhstan

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What I'm looking for

I’m looking for remote work where I can refactor legacy PHP systems, build and document APIs, optimize SQL and caching, and strengthen CI/CD and team-based development—especially with architectural refactoring and DDD-style approaches.

I’m a Senior PHP full-stack developer with 9+ years across e-commerce, fintech, transportation, EdTech, warehouse SaaS, and internal CRMs. I bring troubled projects to a stable state by quickly mastering complex business logic and legacy codebases.

Most recently, I developed and maintained a warehouse SaaS system for inventory tracking, movements, balances, users, and internal operations. I built the backend on Yii2/PHP and MySQL, created an admin panel, delivered mobile experiences with Expo Go/React, and worked on push-notification integrations.

I’ve repeatedly improved reliability and performance: refactoring legacy inventory modules, fixing large volumes of business-logic bugs, implementing localization through Crowdin, and refining mobile scenarios to reduce support load. I also set up Docker environments and CI/CD with GitHub Actions to speed up releases and reduce manual verification time.

In outsourcing and product work, I’ve developed REST/GraphQL APIs, designed databases, optimized SQL queries, implemented caching, and built admin panels and dashboards (including systems with 150+ sections). I’m especially interested in architectural refactoring of legacy systems, API development, performance optimization, DDD-style work, caching, CI/CD, and team-based development.

Experience

Work history, roles, and key accomplishments

Current

Senior PHP Full-Stack Developer

Current

Flat White

Aug 2022 - Present (3 years 11 months)

Developed and maintained the Toolkeep warehouse SaaS, including a Yii2/PHP + MySQL backend, a new admin panel, mobile apps (Expo Go/React), and push notification integrations. Stabilized and refactored undocumented legacy business logic and improved release automation using Docker and GitHub Actions.

PHP Laravel MySQL Redis React Expo JavaScript Webpack Docker Docker Compose GitHub Actions Nginx Linux Crowdin Grafana Sentry Git PHPUnit CI CD

Senior PHP Full-Stack Developer

Flip.kz, LLP

Aug 2019 - Jul 2022 (2 years 11 months)

Developed and maintained an e-commerce platform with a large product catalog, partner dashboard, internal admin panel, and warehouse management processes. Worked across legacy PHP/ZF1 and new Yii2/Laravel backend modules and implemented integrations and mobile scenarios for warehouse accounting.

PHP Laravel ZF1 MySQL PostgreSQL Redis GraphQL JavaScript React jQuery Docker Docker Compose GitHub Actions Gitlab CI Nginx Linux Webpack PHPUnit Sentry Grafana Jira Crowdin Document Management

PHP Full-Stack Developer

SimbirSoft, LLC

Aug 2016 - Jun 2019 (2 years 10 months)

Built and maintained custom and outsourced applications across fintech, education, transportation, media, and CRM, with backend development in PHP/Yii2/Laravel and database design. Developed REST/GraphQL APIs and admin panels, and on some projects served as a team lead for task breakdown, code reviews, and mentoring.