Problem

Promenade's in-store checkout process was brittle: POS frontend apps needed to interact with legacy Magento 1 APIs, while supporting printers, barcode scanners, and Stripe readers. Failures caused checkout delays and degraded store operations.

Approach

• Designed REST + GraphQL APIs to bridge Magento 1 (wrapped in Symfony) with modern frontend apps.
• Integrated Stripe card readers with secure pairing and fallback flows.
• Created a reliability testing blueprint using JMeter for hardware/payment workflows.
• Built a Docker-based dev workflow for fast local iteration and onboarding.
• Mentored team members on POS architecture and onboarding new engineers.

Results

• Checkout reliability improved significantly (double-digit reduction in failures).
• New Stripe reader integration allowed smooth rollout of card-present payments.
• Developers onboarded faster with Docker dev environment + clear API docs.

Tech Stack

• PHP 8, Symfony (Magento wrapper)
• GraphQL, REST APIs
• Stripe SDK, POS hardware integrations
• React, Vue
• Docker, JMeter