Esther Jenslin

Architected and delivered responsive Flutter/Dart UI across multiple feature modules, collaborating with UI/UX designers and using Git-based code review. Implemented scalable state management and improved maintainability by reducing unnecessary widget rebuilds. Wrote unit and widget tests to prevent regressions and used debugging/profiling to resolve production issues and improve app stability. Coordinated with stakeholders during Agile sprint ceremonies to clarify requirements and speed up sign-off.

Integrated Firebase Authentication, Firestore, and Cloud Messaging (FCM) to support core features in live production Flutter apps. Connected third-party and RESTful APIs for secure data retrieval and backend communication across multiple apps. Resolved production bugs using Git version history and issue tracking, improving turnaround time and overall reliability of the mobile products.

Developed cross-platform Flutter mobile applications focused on responsive layouts across device sizes and orientations. Wrote reusable and testable widget-based code and applied state management using Dart streams/futures concepts. Collaborated with designers to deliver engaging user interfaces with custom animations and optimized Dart code for better runtime performance while maintaining code via Git.

Integrated REST APIs and Firebase backend services to support real-time updates in Flutter applications. Built foundational skills in state management, local storage (SQLite and shared preferences), debugging practices, and app deployment using Google Play Console. Supported manual testing and UI optimization to ensure consistent performance across devices.

Created a responsive, user-friendly mobile experience by designing and implementing core app screens and functionality. Integrated PostgreSQL-backed data handling for efficient storage and data access. Focused on end-to-end product usability with stable UI behavior and smooth in-app flows.

Built a verifiable credentials platform implementing a self-sovereign identity application aligned with W3C interoperability concepts. Implemented KYC onboarding and biometric authentication, along with a government credential flow. Added a WebSocket-based chat module and integrated FCM push notifications across iOS and Android. Connected supporting backend APIs for issuer, wallet, and verifier flows.

Delivered core modules for a safety and fire compliance app, including listings, scheduling, and notification features. Implemented secure payment and booking flows using Stripe and PayPal. Focused on reliable mobile UX for compliance-related workflows and timely user communications through notifications.

Developed a concert ticketing app with real-time listings including artists, venues, dates, and ticket availability details. Implemented secure booking and payment workflows using Stripe and PayPal. Added user account features such as booking history and favorites, plus interactive seat selection with dynamic pricing. Integrated push notification reminders for upcoming events.

Built consumer and admin travel booking app UI, including complex screen flows for B2C and B2B use cases. Implemented REST API integration with multiple payment gateways to enable secure transactions. Added Firebase Analytics, Firestore-driven data, and real-time push notifications, including Facebook sign-in authentication. Supported localization for adapting content and currency for international users.