Open to opportunities

Leonardo Bai

@leonardobai

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Senior Android engineer building secure Kotlin apps and SDKs with Clean Architecture.

Brazil

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What I'm looking for

I’m looking for remote international roles where I can own Android delivery end-to-end, set architectural standards, and build/testing pipelines that improve reliability—especially in fintech-style product and mobile security SDKs.

I’m a Senior Android Engineer with 5+ years building production Kotlin apps and SDKs at fintech scale, with a focus on Clean Architecture, modularization, and mobile security. I thrive on owning end-to-end delivery—from design to CI/CD—while raising engineering quality through testing culture.

At PicPay, I shipped corporate payment features (Boleto, Pix, and card flows) across a large, multi-modular monorepo serving millions of business users. I introduced automated testing from scratch during legacy refactors, moving coverage from near-zero and helping reduce production incidents and release rollbacks.

At Caf, I helped redesign the FaceLiveness SDK from scratch with a new modular architecture and 95% test coverage for enterprise fraud-prevention clients. I also engineered reverse-proxy integration across Android/iOS and built a Kotlin Multiplatform (KMP) library to share end-to-end user-flow metrics and crash data to Metabase.

Earlier, at Invillia (embedded at PagBank), I delivered payment-grade security improvements (R8 obfuscation and ProGuard rules), built CI pipelines with GitHub Actions and Docker Compose for instrumented tests, and automated API documentation generation with Dokka. I’m fluent in English and targeting remote international roles.

Experience

Work history, roles, and key accomplishments

Android Engineer

PicPay

Mar 2025 - Apr 2026 (1 year 1 month)

Built corporate payment features (Boleto, Pix, and card flows) for a high-stakes payments product serving millions of business users. Introduced automated testing, established Clean Architecture/MVVM standards, and improved observability across a large modular monorepo.

Kotlin Jetpack Compose Clean Architecture MVVM CI CD Observability Boletos Testing Automation

Android Engineer

Caf

May 2024 - Mar 2025 (10 months)

Contributed to a full redesign of the FaceLiveness SDK with new modular architecture and 95% test coverage for enterprise fraud-prevention clients. Implemented secure reverse-proxy integration for Android/iOS and built a Kotlin Multiplatform (KMP) library to report metrics and crashes to Metabase.

Kotlin Swift FaceLiveness SDK Mobile Security Modular Architectures Test Coverage Reverse Proxy Integration Android iOS Kotlin Multiplatform Metabase Crash Reporting

Android Engineer

Invillia (embedded at PagBank)

Feb 2022 - Apr 2024 (2 years 2 months)

Implemented R8 obfuscation and ProGuard rules for the PagBank payment SDK to meet payment-grade security requirements. Built CI automation with GitHub Actions and Docker Compose for instrumented tests and automated API documentation generation with Dokka.

Kotlin Java ProGuard GitHub Actions Docker Compose Dokka

Android Developer

BRQ Digital Solutions

Jan 2021 - Jan 2022 (1 year)

Maintained legacy Java Android projects and developed Kotlin applications integrated with Salesforce. Built the company’s first native Kotlin Android app and a reusable Kotlin upload library using the Salesforce Composite API.

Java Kotlin Salesforce Android Development Composite APIs Reusable Kotlin Library Upload Flutter