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Mohamed Arafa

@mohamedarafa

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Backend software engineer who built a concurrency-safe order matching engine processing 18,700+ operations per second.

Egypt

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At ServiceTech, I engineered a NestJS and TypeScript microservices architecture for high-throughput event-driven workflows. Redis caching and distributed locking reduced PostgreSQL load by 40%, while Docker and AWS ECS supported containerized deployments.

On Matchbook, I engineered a real-time event-sourced order matching engine that achieved 18,700+ operations per second with sub-millisecond execution times. I also built FleetPulse, a last-mile delivery engine with concurrency-safe courier dispatch and a double-entry COD settlement engine.

Experience

Work history, roles, and key accomplishments

Software Engineer (Backend Focused)

ServiceTech

Nov 2023 - Aug 2025 (1 year 9 months)

Engineered a high-concurrency microservices architecture using NestJS, TypeScript, and RabbitMQ, decoupling data ingestion from processing. Implemented Redis caching and distributed locking strategies, reducing PostgreSQL load by 40% and achieving sub-millisecond response times.

NestJS TypeScript RabbitMQ Redis Redlock PostgreSQL MongoDB Elasticsearch Docker AWS ECS Fargate GitHub Actions Jest Swagger OpenAPI Bearer Token Authentication

Full Stack Developer (Internship)

bld.ai

Jun 2023 - Aug 2023 (2 months)

Completed a 3-month Full Stack Development internship, gaining hands-on experience across the full software development lifecycle. Developed RESTful APIs and server-side logic using Node.js, integrating frontend interfaces with backend services and database systems.

NodeJS REST APIs Fullstack Development