5+ years delivering payment features and biometric SDKs at fintech scale — Kotlin, Clean Architecture, and testing culture included.
Senior Android Engineer with 5+ years building production Kotlin apps in fintech and mobile security. At PicPay, I shipped corporate payment features — Boleto, Pix, and card flows — across a large-scale multimodular monorepo serving millions of business users. At Certta (formerly Caf), I contributed to the full redesign of a biometric SDK, reaching 95% test coverage and making it viable for enterprise fraud-prevention clients with strict reliability SLAs.
I specialize in Clean Architecture, Jetpack Compose, and SDK development. At PicPay, I introduced a testing culture from scratch — going from near-zero coverage to a practice the team actively maintained. At Certta, the team built that culture together from day one as part of a full SDK redesign, and I was part of establishing it. I've also built CI/CD pipelines with Docker and GitHub Actions — including automated release pipelines and Dokka-generated docs deployed to GitHub Pages in my open-source Ktor project — and served as the architectural reference for both teams.
Beyond Android, I build with Kotlin Multiplatform (KMP/Compose Multiplatform) targeting both Android and iOS, write Swift and SwiftUI for native iOS work, use Ktor for backend services, and integrate C++ via JNI for performance-critical native components. I publish to Google Play. Fluent in English — actively looking for remote international opportunities where engineering quality and delivery reliability are first-class concerns.
Android
iOS
Kotlin
Jetpack Compose
KMP
Clean Architecture
MVVM
MVI
SOLID
Coroutines / Flow
RxJava
Dagger
Ktor
CI/CD
Docker
Swift
Java
Flutter
Google Play
Firebase
Corporate (PJ) payment solutions at one of Brazil's largest digital banks. Built with Kotlin, Jetpack Compose, Clean Architecture, and MVVM in a large-scale multimodular monorepo. Introduced a testing culture from scratch during legacy refactoring — improving coverage, reducing production incidents, and increasing delivery reliability. Go-to reference for architectural decisions and code standards across the team. Worked on bank slips (boleto), Pix, and card payment methods.
Android
Kotlin
Jetpack Compose
Google Play
Firebase
MVVM
Clean Architecture
SOLID
Testing
Mobile security SDK team with development in Kotlin and Swift. Contributed to the full redesign of the FaceLiveness SDK from scratch — new modular architecture with 95% test coverage built collaboratively with the team. Engineered reverse-proxy integration for both Android and iOS under urgent delivery pressure from a high-value enterprise client, stepping outside the Android domain to own the solution end-to-end. Developed runtime metric reporting and crash tracking to Metabase via a Kotlin Multiplatform (KMP) library shared across Android and iOS — avoiding Google dependencies that would conflict with client app integrations in a third-party SDK context. Managed Protobuf SDK flavors (Lite and standard).
Android
iOS
Kotlin
Swift
Firebase
MVVM
Clean Architecture
SOLID
Mobile Security SDK
Testing
Android payment SDK and apps for card terminals, built with Kotlin, Java, and C++ via JNI for performance-critical native components. Diagnosed and resolved a battery drain and OS-level performance bottleneck on merchant devices: terminals used by street vendors would accumulate a full day's worth of queued metrics and flush everything at once via a background Service when connectivity returned — choking the OS. Replaced the trigger-based flush with a WorkManager job on a 30-minute configurable interval, draining metrics during idle time, and added a transaction guard to prevent mid-payment interference. Implemented R8 obfuscation for payment-grade reverse engineering protection. Built a CI pipeline for instrumented tests using Docker Compose and GitHub Actions. Managed PagBank payment SDK flavors across multiple integration contexts.
Android
Kotlin
Java
Firebase
C++ / JNI
MVVM
Clean Architecture
SOLID
Testing
Payment SDK
Docker
CI/CD
R8
Maintained legacy Java projects and developed Kotlin applications integrated with Salesforce. Built the company's first native Android app in Kotlin — introducing the language to a mobile portfolio written entirely in legacy Java — and its first Flutter app, reducing onboarding time. Built a native Kotlin upload library using the Salesforce Composite API.
Android
Kotlin
Java
Flutter
Firebase
MVVM
Cross-platform memory matching game featuring fantasy creatures called Astors. Built with Kotlin Multiplatform and Compose Multiplatform for Android and iOS. Available on Google Play.
Android
iOS
Google Play
Firebase
KMP
Compose Multiplatform
SQLDelight
Koin
Ktor Client
Coroutines
API transformation service that lets you define mapping rules to convert any public API's response into a custom format. Supports field renaming, nesting, concatenation, and empty-field exclusion — with a preview endpoint for safe testing before committing a route.
Kotlin
Ktor Server
Ktor Client
MongoDB
Docker
Fly.io
GitHub Actions
Kotlin Multiplatform client for Project Middleware. Android (Jetpack Compose) and iOS (SwiftUI) apps share business logic via KMM, with a SQLDelight local cache and Ktor networking. Create, preview, and manage API route mappings from your phone.
Android
iOS
Google Play
Firebase
KMP
Jetpack Compose
SwiftUI
SQLDelight
Ktor Client
Hilt
Coroutines
Flutter app that shows real-time air quality data. Browse countries, select a location, and view detailed air quality parameters.
Flutter
Dart
GetX
I write about Android development, Kotlin, and architecture on Medium.
This article is an English adaptation of my YouTube video “Entendendo de vez a BOLHA das Inteligências Artificiais” (Understanding the AI Bubble Once and For All), originally recorded in Portuguese for the Canal Backtracking channel. If you speak Portuguese, you can watch the ful…
Why Convention Plugins for Dokka? As Android projects scale with multiple modules, maintaining consistent documentation standards becomes as crucial as code quality. Dokka, Kotlin’s official documentation engine ( kotlin/dokka ), is powerful for generating beautiful API documenta…
Why Convention Plugins for Detekt? As Android projects grow in complexity with multiple modules, maintaining consistent code quality standards becomes increasingly challenging. While Detekt is an excellent static analysis tool for Kotlin projects, configuring it across dozens of …
How Convention Plugins Fix Android Build Chaos Modern Android apps require multi-module setups, but traditional build configurations — copy-pasted, inconsistent, and bloated — slow teams down. Convention plugins replace 43+ lines of boilerplate with 3-line declarations, solving s…
Feel free to reach out — I'm happy to chat.