Kateryna Z.

Most apps fail not because of poor design, but because of unstable architecture, slow performance, or rejections during store review. I design and build production-ready mobile applications built to handle scale, real-world edge cases, and active users from day one.

Why clients choose to work with me:

Zero-friction App Store & Google Play approval: Clean code and strict guideline adherence to pass reviews without delays.

Offline-first & Real-Time resilience: Experience building applications that maintain data integrity and keep working even with unstable network connections.

Cost & Speed efficiency: Deep expertise in Flutter delivers near-native performance across iOS and Android from a single codebase—saving up to 40% in engineering overhead.

End-to-End Delivery: From technical architecture and API integration to deployment and long-term scaling.

Core Capabilities & Solutions:

Cross-Platform & Native Apps: Flutter, Dart, Swift (iOS), Kotlin (Android)

Connected Tech & Hardware: BLE integrations, GPS navigation, and IoT data sync

AI-Powered Features: Intelligent assistants, smart automation, and LLM integrations

Scalable Backends: Event-driven architecture, REST/GraphQL APIs, Node.js, Spring Boot

Cloud & Real-Time Sync: Firebase, Supabase, Kafka, AWS

Selected Domain Experience:

Real-Time Tracking & Navigation: Low-latency route optimization and telematics.

SportTech & Connected Wellness: Real-time data streaming from sensors and connected devices.

High-Load Platforms: Clean modular state management designed to scale to hundreds of thousands of active users.

Whether you are launching an MVP, refactoring an unstable codebase, or integrating complex AI features into your existing product, send over your specs or current build and let’s discuss the right technical roadmap.