Saeid Rezaeisadrabadi
Senior Mobile Engineer
PAYBACK
I'm a Senior Mobile Engineer with over 8 years of experience architecting, developing, and maintaining complex mobile applications at scale. I specialize in performance optimization and build tooling with deep, hands-on expertise taking production apps through the full software development lifecycle.
A self-described build tools geek, I care deeply about writing clean, maintainable, and performant code, with a strong commitment to user privacy and secure, user-centric experiences. I bring that same discipline to the systems and pipelines that power mobile development at enterprise scale.
Beyond engineering, I'm a dedicated mentor and collaborative team player who actively contributes to high-impact technical decisions. I thrive at the intersection of deep technical craft and team growth, always expanding my knowledge and pushing the boundaries of what great mobile engineering looks like.
Bazel for iOS at Scale: Lessons from a Real Enterprise Migration with over 300 modules
Session
In this talk, I will share the journey of migrating an iOS application at PAYBACK, serving more than 18 million monthly active users and consisting of 116 feature modules, 208 service modules, 18 shared modules, and four country-specific app variants.
The session will cover how we evaluated Bazel, addressed a complex dependency graph, and integrated both local and remote Swift packages.
I will discuss our incremental migration strategy, which allowed Bazel and Xcode to coexist throughout the transition, as well as the steps taken to improve build performance from initially matching Xcodebuild speeds to achieving 2× faster builds, and ultimately 3–6× improvements through spawn strategy optimization and local caching.
I will also explore our ongoing efforts to build Kotlin Multiplatform with Bazel in a monorepo environment.
Finally, the talk will highlight practical lessons learned around CI integration, BuildBuddy observability, and testing strategies within a large enterprise setup.