v
vladnegriy

Vladislav N

@vladnegriy

FullStack Developer

Ukraine
Ukrainien, Russe
Certaines informations sont présentées en anglais.
À propos de moi
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.... Plus d’infos

Compétences

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vladnegriy
Vladislav N
hors ligne • 

Voir mes services

Sites Web personnalisés
I will design and optimize database architecture
De150 $US / projetPlus de détails
Développement d'applis Android
I will develop secure autonomous user registration and id systems
De250 $US / projetPlus de détails

Portfolio

Expérience professionnelle

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.