Open to opportunities

abdelrahman mostafa

@abdelrahmanmostafa1

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Senior full-stack and mobile architect building scalable, observable products with Go, Python, and Flutter.

Saudi Arabia

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What I'm looking for

I’m open to senior engineering and technical leadership roles at ambitious technology companies worldwide—where I can build teams, set technical direction, and deliver fast, observable, scalable systems across backend, mobile, and cloud.

I’m a Senior Full-Stack and Mobile Engineer with over 8 years of experience designing, building, and scaling complex digital products across mobile, backend, and cloud platforms. I love turning ambiguous ideas into systems that are fast, observable, and built to scale.

As Co-Founder and Chief Technology Officer (CTO) of KLLIQ LLC, I led the full engineering lifecycle of Cashewo, a privacy-first social media platform that grew from zero to 5M+ registered users. I also helped drive a 30% increase in user engagement and a 20% boost in revenue, while reducing deployment cycle time by 40% through CI/CD, code review standards, and engineering best practices.

On the freelance side, I architected the complete backend infrastructure for QEU, a smart grocery and supermarket platform powered by Go microservices and a Python machine learning engine running a locally hosted LLM for real-time personalized recommendations. I’m known for building teams, setting technical direction, and delivering distributed, event-driven architectures with strong observability and performance.

Experience

Work history, roles, and key accomplishments

Current

Freelance Backend Engineer

Current

QEU

Jan 2024 - Present (2 years 5 months)

Architected the complete backend infrastructure for QEU, building distributed Go microservices that handle millions of daily requests. Implemented a Python ML recommendation engine using a locally hosted LLM for contextual personalized picks, and deployed on Kubernetes with gRPC/RabbitMQ/Redis to support sub-50ms response times at peak load.

Microservices gRPC RabbitMQ Redis PostgreSQL Kubernetes Docker REST APIs

Current

Co-Founder & CTO

Current

KLLIQ LLC

Jan 2020 - Present (6 years 5 months)

Co-founded and scaled KLLIQ LLC, leading engineering for Cashewo to 5M+ users, with 30% higher user engagement and 20% revenue growth. Defined the technical roadmap and established CI/CD and engineering best practices, reducing deployment cycle time by 40%.

Flutter Kubernetes AWS CI CD Microservices Architecture System Design Team Leadership Roadmapping

Current

Senior Full-Stack Engineer

Current

KLLIQ LLC

Mar 2017 - Present (9 years 3 months)

Architected and scaled Cashewo to 5M+ registered users, achieving sub-100ms API response times under concurrent load. Built Go microservices (gRPC/RabbitMQ/Redis), cross-platform Flutter and native Swift/Kotlin apps, and deployed on Docker/Kubernetes on AWS/DigitalOcean with 99.9%+ availability and 35% higher throughput via observability.

Go gRPC RabbitMQ Redis Flutter Swift Kotlin Kubernetes Observability

Senior Software Engineer

Upwork

Oct 2019 - May 2021 (1 year 7 months)

Delivered 10+ production mobile and web applications for international clients across social media, e-commerce, healthcare, logistics, and entertainment. Built Flutter/React Native and native Swift/Kotlin solutions, implementing location-based search, booking workflows, secure messaging, and payment integrations.