Cristiano Winter
@cristianowinter
Senior Android mobile engineer specializing in production on-device LLMs and privacy-first experiences.
BrazilWhat I'm looking for
I’m a Senior Mobile Engineer with 10 years building Android and cross-platform mobile products, and I’m currently shipping production on-device AI for residential property tech. I built one of the first deployed on-device LLM assistants in Canadian proptech using MediaPipe and Gemma—cutting cloud inference cost while preserving resident privacy with full offline support.
My background spans Wear OS security (NFC digital keys), Jetpack Compose, and Flutter architecture leadership. I’ve launched companion apps from scratch with independent CI/CD, designed anti-tampering protections for enterprise compliance, and led multi-module Gradle + Clean Architecture migrations across 5+ engineers to improve incremental build times and test isolation. I also enjoy solving hard reliability problems—like concurrency race conditions via single-flight request deduplication—while delivering end-to-end product lines into production.
Experience
Work history, roles, and key accomplishments
Android Developer
1VALET
Jan 2022 - Present (4 years 5 months)
Architected and shipped a privacy-first on-device LLM assistant (MediaPipe + Gemma) that eliminated cloud inference cost, removed PII transmission, and worked fully offline for Canadian residential property tech. Launched the Wear OS companion app with secure door unlock via NFC digital keys and watch-to-phone synchronization, and led multi-module Gradle + Clean Architecture migration for a 5+ eng
Mobile Engineer
Ambev Tech
Jun 2020 - Jan 2022 (1 year 7 months)
Mentored 4 mobile engineers through code reviews and pairing, reducing PR cycle times and raising squad code quality. Contributed to Android architecture for Ambev distribution apps serving 1M+ retail points of sale, and delivered 3+ proofs of concept that influenced production architecture decisions.
Tech Lead — Mobile
Ambev Tech
Dec 2019 - Jun 2020 (6 months)
Designed Flutter application architecture from scratch, establishing patterns adopted across a mobile team working on 2+ concurrent projects. Built Azure DevOps CI/CD pipelines for Flutter to overcome App Center limitations, cutting release cycle time from days to hours.
Mobile Developer
Ellevo Soluções
Jan 2018 - Dec 2019 (1 year 11 months)
Designed and implemented Android and iOS mobile architecture enabling dual-platform delivery from a single codebase. Automated CI/CD on Azure DevOps and App Center and maintained a 100% submission success rate across Play Store and App Store releases over 2 years.
Mobile Engineer
AMcom Sistemas
Jul 2017 - Jan 2018 (6 months)
Developed cross-platform Android/iOS solutions with Xamarin Forms and integrated a native C++ Bluetooth thermal printer library. Achieved 80%+ shared code reuse across platforms.
Software Engineer
Hiper
Nov 2016 - Jun 2017 (7 months)
Built an automated software update delivery system using WebSockets, eliminating manual technician overhead for routine local-network distribution.
Software Engineer
Sensum Sistemas
Oct 2013 - Nov 2016 (3 years 1 month)
Developed and maintained enterprise logistics software in C#, SQL Server, and Windows Forms, shipping multiple releases of business-critical modules over 3 years. Owned ongoing improvements and support for production systems.
Education
Degrees, certifications, and relevant coursework
Universidade do Vale do Itajaí (UNIVALI)
Bachelor of Technology, Information Technology
Bachelor of Technology in Information Technology at Universidade do Vale do Itajaí (UNIVALI) in Itajaí, Brazil.
Availability
Location
BrazilAuthorized to work in
Social media
Job categories
Skills
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