Open to opportunities

Julio Cesar

@juliocesar1

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Senior Flutter and Golang developer focused on clean architecture and scalable apps.

Brazil

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What I'm looking for

I seek senior engineering or technical lead roles where I can drive architecture, improve QA/CI practices, mentor teams, and deliver secure, scalable Flutter + Golang solutions.

I am a Senior Architect and Tech Lead with over eight years building mobile, web, and desktop applications using Flutter and four years developing backends in Golang on Google Cloud Platform.

I specialize in clean code, SOLID principles, test automation, CI/CD with GitHub Actions and Firebase, and strong system architecture that scales for millions of users.

Throughout my career I led teams, performed code reviews, wrote performance and security documentation, and guided projects through pentests and major refactors that improved stability and app store ratings.

I founded a development studio, launched an instant-deployment micro-apps platform, and delivered production systems for large clients, always emphasizing quality, automation, and measurable results.

Experience

Work history, roles, and key accomplishments

Current

Flutter & Golang Specialist

Current

Remote Legal

Oct 2024 - Present (1 year 3 months)

Developed, improved and maintained a Flutter and Golang product, implemented end-to-end integration and golden-image tests that drastically reduced production bugs.

Flutter Go Integration Testing Golden Image Tests CI CD Test Automation

Technical Lead Specialist

Grupo GFT

Apr 2024 - Oct 2024 (6 months)

Led Flutter mobile development and Golang backend efforts, produced comprehensive project documentation and drove fixes that enabled the project to pass a pentest, improving client security and trust.

Flutter Go Code Review & Security Documentation Performance Optimization Team Leadership

Founder / Flutter & Golang Developer

Asapp Development

Oct 2023 - Mar 2024 (5 months)

Founded and led Asapp Development delivering mobile, web and desktop apps; launched an instant-deployment micro-apps platform that streamlined product launches for small businesses and creators.

Flutter Go System Design CI CD Client Delivery

Flutter Architect & Technical Lead

Scrum Launch

Oct 2022 - Oct 2023 (1 year)

Architected and led app development from design to CI/CD, implemented end-to-end integration tests and benchmarks, and refactored MVP to V2, raising store rating from 4.2 to 4.87.

Flutter CI CD GitHub Actions Integration Testing Benchmarking App Architecture Refactoring

Flutter Architect & Technical Lead

Grupo Data

Nov 2021 - Oct 2022 (11 months)

Developed features, improved performance and led refactor to align with new backend guidelines during a migration, supporting an app with over 1 million active users.

Flutter Performance Refactoring Backend Kotlin Java

Mobile Developer

Grupo GFT

Jul 2020 - Nov 2021 (1 year 4 months)

Developed and improved banking apps (Banco Original, Banco Votorantim) using Java/Kotlin and led integration of a custom native keyboard SDK into a Flutter app via IPC.

Kotlin Java SDK Integration Mobile Development

Mobile Developer

DevMaker MobileApps

Apr 2019 - Apr 2020 (1 year)

Delivered mobile app development, fixes and improvements across Java, Kotlin, Swift and React Native stacks and introduced React Native to the company as the first developer in that stack.

Android iOS React Native Java Kotlin Swift Mentoring

Education

Degrees, certifications, and relevant coursework

Self-taught

Self-taught, Software Development

Activities and societies: Completed multiple online courses and certificates including Flutter Development Using Dart (App Brewery), The Complete Go Bootcamp, Java Spring Development (Udemy), EF SET English Certificate; informal study in Spanish and French.

Self-directed study in software development, Flutter, Golang, backend and mobile technologies with completion of multiple online courses and certifications.