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Thiago Füllenbach

@thiagofllenbach

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Fullstack Software Engineer specializing in Native Android (Java/Kotlin) and Java Spring Boot backend systems.

Brazil

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What I'm looking for

I’m looking for a role where I can work as a native Android developer, focused on building modern mobile applications using Kotlin and Jetpack Compose, designing clean and modular architectures, and delivering high-quality, user-friendly experiences.

I’m a Fullstack Software Engineer focused on Native Android (Java/Kotlin) and Backend development with Java (Java EE / Spring Boot), with experience in mission-critical retail systems. I build embedded applications (SmartPOS/PDV) and Web ERP integrations, keeping distributed systems reliable through data synchronization.

At SWEDA INFORMÁTICA LTDA., I integrated multiple payment providers (including Cielo, Getnet, PagSeguro, Stone, and Rede) and implemented NFC-e adjustments for the 2026 tax reform with no production incidents. I designed and improved POS↔ERP synchronization using ActiveMQ (Queue & Pub/Sub), resolved production OOM issues (LeakCanary/Android Profiler), and optimized a critical POS report from 30min to 3min.

Experience

Work history, roles, and key accomplishments

Mid-Level Software Developer

Sweda Informática Ltda

Aug 2021 - Feb 2026 (4 years 6 months)

Developed and maintained a mission-critical distributed retail system connecting an embedded Android POS (PDV) with a Web ERP via messaging, integrating multiple payment providers and external APIs. Improved reliability and performance by optimizing a POS report from 30 minutes to 3 minutes, implementing NFC-e compliance ahead of deadline without production incidents, and supporting 300+ ERP resel

Java Kotlin Android SDK REST APIs