Douaa User

I’m a Senior Technical Architect focused on platform and mobile systems, turning product goals into scalable architectures that keep reliability and security at the core. I’m a technical owner with 9+ years of experience designing and delivering large-scale web, backend, and cloud solutions.

At PAYBACK (since January 2025), I led a GCP cost optimisation initiative, reducing cloud spend by >90% through rightsizing, resource cleanup, and architectural improvements. I architected end-to-end GCP data pipelines (API Gateway → Cloud Run → Pub/Sub → Dataflow → BigQuery → Looker Studio) with fault tolerance, dead-letter handling, and idempotency controls.

I also built infrastructure and delivery foundations: a Terraform-based GCP infrastructure pipeline with plan validation, approval gates, environment isolation, and rollback strategies, plus a GitHub Actions CI/CD pipeline that detects Gradle modules and runs parallel builds only for affected modules. For security-by-design, I implemented secret rotation and mitigated CI action compromise risk with action pinning (e.g., Trivy).

Beyond cloud, I partner across product and engineering—led a cross-functional team of 8 engineers, mentored senior and mid-level engineers, and supported technical hiring and onboarding. I’ve contributed deeply to mobile by delivering large-scale Android features, modernizing Java → Kotlin and RxJava → Coroutines, and collaborating on Kotlin Multiplatform (KMM) shared modules for iOS, ensuring stability through monitoring, A/B testing, and performance optimisation.