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I’m Thassio, a senior Flutter Engineer with 7 years of experience building and leading mobile products using Flutter and Dart. I’ve worked on high-impact features for enterprise and consumer apps, supporting large user bases (over 1 million users) across domains like communications, intranets, real-time media, maps, and AR integrations. I enjoy taking full ownership of complex features end-to-end—designing solutions, improving codebase scalability and performance, and driving quality through unit and E2E testing. I also care a lot about engineering excellence, mentoring teammates, accessibility (A11y), and building maintainable, future-proof systems; I’m open to remote opportunities and enjoy collaborating closely with product, design, QA, and cross-functional squads.…I’m Thassio, a senior Flutter Engineer with 7 years of experience building and leading mobile products using Flutter and Dart. I’ve worked on high-impact features for enterprise and consumer apps, supporting large user bases (over 1 million users) across domains like communications, intranets, real-time media, maps, and AR integrations. I enjoy taking full ownership of complex features end-to-end—designing solutions, improving codebase scalability and performance, and driving quality through unit and E2E testing. I also care a lot about engineering excellence, mentoring teammates, accessibility (A11y), and building maintainable, future-proof systems; I’m open to remote opportunities and enjoy collaborating closely with product, design, QA, and cross-functional squads.

Thassio Vinicius Costa

App Developer, Web Developer, Full Stack Developer, +4

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I’m Thassio, a senior Flutter Engineer with 7 years of experience building and leading mobile products using Flutter and Dart. I’ve worked on high-impact features for enterprise and consumer apps, supporting large user bases (over 1 million users) across domains like communications, intranets, real-time media, maps, and AR integrations. I enjoy taking full ownership of complex features end-to-end—designing solutions, improving codebase scalability and performance, and driving quality through unit and E2E testing. I also care a lot about engineering excellence, mentoring teammates, accessibility (A11y), and building maintainable, future-proof systems; I’m open to remote opportunities and enjoy collaborating closely with product, design, QA, and cross-functional squads.…I’m Thassio, a senior Flutter Engineer with 7 years of experience building and leading mobile products using Flutter and Dart. I’ve worked on high-impact features for enterprise and consumer apps, supporting large user bases (over 1 million users) across domains like communications, intranets, real-time media, maps, and AR integrations. I enjoy taking full ownership of complex features end-to-end—designing solutions, improving codebase scalability and performance, and driving quality through unit and E2E testing. I also care a lot about engineering excellence, mentoring teammates, accessibility (A11y), and building maintainable, future-proof systems; I’m open to remote opportunities and enjoy collaborating closely with product, design, QA, and cross-functional squads.

Available to hire

I’m Thassio, a senior Flutter Engineer with 7 years of experience building and leading mobile products using Flutter and Dart. I’ve worked on high-impact features for enterprise and consumer apps, supporting large user bases (over 1 million users) across domains like communications, intranets, real-time media, maps, and AR integrations.

I enjoy taking full ownership of complex features end-to-end—designing solutions, improving codebase scalability and performance, and driving quality through unit and E2E testing. I also care a lot about engineering excellence, mentoring teammates, accessibility (A11y), and building maintainable, future-proof systems; I’m open to remote opportunities and enjoy collaborating closely with product, design, QA, and cross-functional squads.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Language

Portuguese

Advanced

English

Advanced

Work Experience

Senior Flutter Engineer at Flip

August 1, 2024 - Present

Delivered high-impact mobile features focusing on communications and intranet requirements (chats, newsfeed, media handling, video calls, livestreams, AI translations and language detection) used by over 1 million enterprise frontline users worldwide. Designed and implemented internal topics and analytics features to improve DX, stability, scalability, performance, and resource usage. Led mobile accessibility compliance, coordinated audits and established long-term accessibility best practices. Initiated and expanded end-to-end test coverage, reducing regressions and increasing release confidence. Contributed to Flip’s internal Design System shared across Web and Mobile, improving consistency. Collaborated cross-squad with product, design, QA, and other mobile teams to align APIs and UX. Mentored peers and advocated for maintainable solutions. Leveraged AI-assisted tooling to accelerate development and delivery.

Mobile Lead at WooshAir

January 1, 2023 - July 1, 2024

Spearheaded improvements to Woosh Air’s mobile app, maintaining high coding standards and implementing complex features with pixel-perfect UI and unit test coverage, following Bloc pattern and clean architecture. Built and maintained an advanced Codemagic CI/CD integration with multi-flavor support. Guided a junior developer, enabling skill development and contributing to release cycles. Collaborated daily with QA, UI/UX, firmware/hardware, data analysis, and backend teams for seamless integration. Played a pivotal role in critical technical decisions for feature implementations and product strategy. Released and maintained Android and iOS apps.

Mobile Software Engineer at Beycome

January 1, 2022 - January 1, 2023

Led development of Beycome’s first Flutter cross-platform mobile app, incorporating plugins and services such as Leaflet Maps, Pusher, Hive, Firebase, Provider, HTTP, Sentry, Geolocator and Speech to Text. Built a complex map-based Flutter architecture for real estate browsing and listings. Released and maintained the app on Android and iOS.

Mobile Software Engineer at Niantic

August 1, 2021 - January 1, 2022

Developed Flutter-Unity integration for Niantic’s AR app. Integrated Niantic’s AR Unity SDK with Flutter app on iOS and Android. Wrote technical documentation for maintenance and expansion of the integration.

Mobile Software Engineer at Eargym

February 1, 2021 - July 1, 2021

Led development of a hearing health monitoring app, including Flutter-Unity integration and features such as scientific tests, hearing monitoring and training results, and scheduled notifications. Oversaw workflow processes for a cross-functional team, enhancing collaboration and code integrity. Released the app on Play Store and App Store.

Mobile Software Engineer at FiresideTech Solutions

March 1, 2020 - January 1, 2021

Developed an experimental online multiplayer Cards game with Flutter. Implemented Firebase integration (Firestore, Cloud Functions, FCM, Authentication, App Distribution, Analytics and Crashlytics) and built the entire game logic and state machine from scratch. Devised an in-app video conference system leveraging WebRTC and AgoraSDK for synchronous communication within the game environment.

Flutter Mobile Developer at Popcode Mobile Solutions

January 1, 2019 - March 1, 2020

Developed test projects and contributed to a team project to gain experience with Flutter. Collaborated with larger teams to apply industry-recognized patterns in mobile app architecture and product development using Flutter and Dart. Presented a lecture on Flutter topics to aid in forming the company’s Flutter team.