v
vladnegriy

Vladislav N

@vladnegriy

FullStack Developer

Ukraine
Ukrainian, Russian
About me
I am a full-stack developer and founder with a strong background in marketing and sales management. I specialize in building end-to-end solutions, including mobile apps with Flutter and backends using Node.js and PostgreSQL. I have extensive experience running a web development studio and managing complex software projects from architecture to delivery.... Read more

Skills

v
vladnegriy
Vladislav N
Offline • 

See my services

Custom Websites
I will design and optimize database architecture
From$150 / projectMore details
Android App Development
I will develop secure autonomous user registration and id systems
From$250 / projectMore details

Portfolio

Work experience

Lead Flutter & P2P Systems Architect

Golosnyk Protocol • Freelance

Jul 2026 - Present • 2 mos

Leading the development of Golosnyk, a secure decentralized P2P communication platform. Architecting cross-platform mobile applications using Flutter and Dart, implementing robust end-to-end encryption (E2EE), cryptographic key management, and zero-telemetry node synchronization.

Lead Database Architect & Backend Engineer

Self-Employed / Freelance • Freelance

Apr 2026 - Present • 5 mos

Architecting and building production-grade database schemas, secure financial ledgers, and automated payment pipelines for high-load e-commerce platforms. - Designed robust PostgreSQL database architectures with optimized sharding and transaction safety. - Implemented append-only wallet transaction ledgers for secure, non-custodial balance and settlement management. - Integrated multi-provider webhooks (WayForPay, Monobank, Google Play) with retry-safe execution and cryptographic signature verification.