I'm Triin Schaffrik, a Senior Mobile Engineer with a track record of building secure, scalable cross-platform apps. I specialize in Flutter, iOS (Swift/SwiftUI), and Android (Kotlin) with a focus on fintech, payments, and digital wallets. I take ownership of features from concept to release and love turning complex requirements into reliable, user-friendly experiences. I design end-to-end mobile architectures, including real-time tracking, offline-first data persistence, and robust authentication flows (including 2FA). I collaborate closely with backend and product teams to deliver secure, maintainable solutions and strive for code reusability and solid deployment processes across iOS, Android, and Flutter.

Triin Schaffrik

I'm Triin Schaffrik, a Senior Mobile Engineer with a track record of building secure, scalable cross-platform apps. I specialize in Flutter, iOS (Swift/SwiftUI), and Android (Kotlin) with a focus on fintech, payments, and digital wallets. I take ownership of features from concept to release and love turning complex requirements into reliable, user-friendly experiences. I design end-to-end mobile architectures, including real-time tracking, offline-first data persistence, and robust authentication flows (including 2FA). I collaborate closely with backend and product teams to deliver secure, maintainable solutions and strive for code reusability and solid deployment processes across iOS, Android, and Flutter.

Available to hire

I’m Triin Schaffrik, a Senior Mobile Engineer with a track record of building secure, scalable cross-platform apps. I specialize in Flutter, iOS (Swift/SwiftUI), and Android (Kotlin) with a focus on fintech, payments, and digital wallets. I take ownership of features from concept to release and love turning complex requirements into reliable, user-friendly experiences.

I design end-to-end mobile architectures, including real-time tracking, offline-first data persistence, and robust authentication flows (including 2FA). I collaborate closely with backend and product teams to deliver secure, maintainable solutions and strive for code reusability and solid deployment processes across iOS, Android, and Flutter.

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Experience Level

Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
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Language

Estonian
Fluent
English
Fluent

Work Experience

Senior iOS Engineer at Bombay Group
February 1, 2026 - April 1, 2026
Took ownership of the core Yolo Wallet application, leading the development of business-critical SwiftUI features for onboarding, authentication, account management and financial transaction flows. Implemented secure authentication and account verification flows, including 2FA, while developing reusable SwiftUI components with a focus on reliability and maintainability. Stabilized critical financial flows by diagnosing and resolving complex issues across transaction handling, WebView integrations and QR scanning, in close collaboration with backend and product teams.
Senior Mobile Engineer at Yolo Group
November 1, 2024 - November 1, 2025
Migration of legacy native apps to cross-platform Flutter framework, improving code reuse and establishing a scalable foundation for faster feature development. Led end-to-end Flutter app development across iOS and Android with native Swift/Obj-C and Kotlin solutions; designed real-time tracking, background location services, offline-first architecture, and robust REST/GraphQL integration.
Mobile Engineer at Food Filter
August 1, 2024 - December 1, 2025
Led the migration of legacy native applications to cross-platform Flutter framework, improving code reusability and establishing a scalable foundation for faster feature development. Built offline-first mobile architectures by integrating local data persistence with RESTful APIs, and established a scalable Flutter-based solution for end-to-end product delivery.
Homework Evaluator at University of Tartu
January 1, 2023 - May 1, 2023
Graded and provided constructive feedback to homework assignments for the course “Artificial Intelligence” during the spring semester.
Mobile Engineer at Trax by OÜ
June 1, 2022 - October 1, 2024
Led migration of legacy native apps to cross-platform Flutter framework; improved code reusability and established a scalable foundation for faster feature development. Managed cross-platform Flutter apps alongside native iOS (Swift/Obj-C) and Android (Kotlin) solutions, delivering products from concept to release.

Education

Bachelor of Science in Informatics at University of Tartu
January 11, 2030 - June 24, 2026

Qualifications

Add your qualifications or awards here.

Industry Experience

Software & Internet, Financial Services, Professional Services

Experience Level

Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
See more

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