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Mohamed Hossam

@mohamedhossam4

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Backend engineer at Harbor who scaled a gaming community platform to 10M+ users and cut YouTube API costs by 98%.

United Arab Emirates

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At Harbor (Windwalk Games, Y Combinator W19), I worked on a community platform serving 10M+ registered users. I architected and deployed four production microservices for OAuth flows, real-time data streaming, analytics aggregation, and background jobs.

I reduced YouTube API operational costs by 98% by re-architecting the analytics ingestion pipeline. I also led recovery from a critical MySQL incident that locked more than one billion rows across 270 tables, restoring service to users.

At Harbor, I designed a real-time chat system and later built a custom C++ service bridged to C# over NATS for a Discord SDK integration. I also designed a sentiment analysis pipeline using Google Cloud NLP and Gemini 2.5 Flash to process Discord and Steam messages.

Before Harbor, I led backend development for ShopX (Lohanza), a multi-vendor marketplace, and owned its AWS deployment and infrastructure. I also built Discord bots and a customer-facing subscription platform at Libertas, and delivered mobile applications for Abovav Inc.

Experience

Work history, roles, and key accomplishments

Senior Backend Engineer

Harbor (Windwalk Games)

Sep 2023 - Aug 2026 (2 years 11 months)

Architected and deployed 4 production microservices for a community platform serving 10M+ users. Resolved a critical production incident affecting billions of database rows and reduced third-party API costs by 98%.

NodeJS TypeScript C#.NET Core C++NATS WebSockets OAuth JWT AWS PostgreSQL MySQL Redis Docker CI CD Google Natural Language API Gemini

Software Engineer (Contract)

Abovav Inc.

Sep 2021 - Oct 2023 (2 years 1 month)

Delivered 3 production mobile applications on Flutter and Firebase with Stripe payment integration. Worked directly with international clients on requirements and delivery.

Flutter Firebase Stripe Mobile Development Client Management

Full-Stack Developer

Libertas

May 2023 - Sep 2023 (4 months)

Built premium Discord bots in Node.js with subscription billing and feature gating. Developed the customer-facing web platform on Laravel and React.

NodeJS Discord APIs Prisma MySQL Laravel React Payment Integration

Backend Developer

ShopX (Lohanza)

Oct 2022 - May 2023 (7 months)

Led backend development for a multi-vendor marketplace using NestJS, PostgreSQL, and Prisma. Owned AWS deployment and infrastructure, including ECS and RDS.

NestJS PostgreSQL Prisma AWS AWS ECS RDS CI CD Mentorship

Education

Degrees, certifications, and relevant coursework

German University in Cairo

Bachelor of Science, Media Engineering and Technology

2018 - 2023

Grade: 90.6/100

Pursued a B.Sc. in Media Engineering and Technology with a GPA of 90.6/100. Completed a thesis on biometric identification from ECG signals using machine learning, achieving 97% classification accuracy.