I work on backend systems for IGA Duty-Free’s Unifree platform across serverless and containerized architectures in production.
I developed a purchase limit system using Node.js, TypeScript, and Fastify, integrating external MSSQL data and internal transaction flows backed by MongoDB. I implemented Redis caching and event processing via RabbitMQ to support asynchronous flows and maintain responsiveness.
I also built a serverless stock tracking system on AWS Lambda to maintain per-store inventory state and update stock after purchases. Additionally, I contributed to backend features for Wizzo, using Amazon Neptune (graph data) and Elasticsearch for real-time/social use cases.

I worked on backend systems in the e-commerce/retail domain, focusing on real-time integrations and event-driven architectures.
I developed a real-time stock control integration between CepteSok and Istegelsin, ensuring reliable propagation of stock updates and data consistency across systems. I also contributed to order, checkout, and payment-related backend flows, working with REST-based integrations and asynchronous communication patterns with a focus on reliability and correctness.

I led development of a scalable serverless e-commerce backend built on AWS using Node.js and event-driven principles for reliability and growth.
I worked on core services responsible for catalog, checkout, and order processing, focusing on low-latency responses and fault-tolerant backend design. I also integrated third-party payment providers (including Edenred and Sodexo) via payment gateways to expand checkout options while keeping flows consistent and maintainable.

I worked as a backend engineer on a serverless e-commerce platform built on AWS.
I developed backend services using AWS Lambda and API Gateway and contributed to DynamoDB data modeling based on access patterns and scalability requirements. I delivered core commerce features such as catalog, checkout, and order management, prioritizing maintainability, performance, and operational simplicity in production.

I independently developed and maintained a fully serverless internal backend system on AWS to support internal business workflows with minimal operational overhead.
I owned the backend end-to-end, including architecture, implementation, deployment, and maintenance. The system prioritized simplicity, scalability, and long-term maintainability, and strengthened my experience in end-to-end backend ownership and cloud-native design.

I developed backend APIs for a consumer-facing mobile application using Node.js and Express.js.
I improved code quality by introducing unit tests for critical flows and iterating on existing API implementations to increase maintainability and reliability in production.

I worked as a QA Engineer across large-scale digital platforms, executing functional and performance testing for backend-driven systems.
I wrote SQL queries for backend validation, collaborated with engineering teams on test planning and defect analysis, and supported test automation and reporting workflows in enterprise QA environments.

Özer Subaşı

I build backends that scale.

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