Looking for a job

Léo Kiszewski

@lokiszewski

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Full-stack engineer at Haila who led BLE door access and WebRTC calling products.

Brazil

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What I'm looking for

I'm open to full-stack, mobile (Flutter), or back-end (.NET) opportunities.

At Haila, I lead full-stack development of mobile and backend products with Flutter and .NET, from architecture through implementation, infrastructure, and app-store releases.

I led a Flutter app for opening doors over Bluetooth Low Energy, focused on a fast, reliable user experience. I also led a WebRTC calling solution connecting mobile apps, web, and SIP terminals, with native Swift and Kotlin integrations for VoIP push notifications and audio routing.

On the backend, I build REST and GraphQL APIs in C#/.NET with PostgreSQL and Redis, and handle Docker, CI/CD, and server deployments. I’m open to full-stack, Flutter mobile, or .NET back-end opportunities.

Experience

Work history, roles, and key accomplishments

Full-stack Developer

Haila

Sep 2021 - Oct 2026 (5 years 1 month)

Lidero o desenvolvimento full-stack (Flutter + .NET) de produtos mobile e backend, com ownership de ponta a ponta: arquitetura, implementação, infraestrutura e publicação nas lojas.
Principais projetos que liderei:
- Abertura de portas via BLE – App Flutter (iOS, Android) que abre portas por Bluetooth Low Energy, com foco em uma experiência rápida e confiável para o usuário.
- Comunicação por cham