Hüseyin Çınar — Full-Stack Software Engineer in Istanbul
I modernise legacy .NET/C# systems, build new backends in Node.js and NestJS, and move them from Kubernetes to Google Cloud and keep them running there. IoT device connectivity, mobile apps and smart contract security are part of the work too.
.NET · C# · WPF · SQL Server · Node.js · NestJS · TypeScript · PostgreSQL · Redis · Kubernetes · GCP Cloud Run · BLE / OTA firmware · Flutter · React Native · Solidity
I'm Hüseyin Çınar, a full-stack software engineer in Istanbul. Over the last 18 years I've built web platforms, IoT-connected consumer products and industrial systems, mostly in the .NET and Node.js/TypeScript ecosystems. I co-founded Modern Yazılım in Istanbul in 2013 and Modern Works Global Ltd in the UK in 2025, and I take client products end-to-end - requirements, architecture, implementation, deployment and long-term operation.
The work I keep getting hired for: taking an inherited, under-documented codebase and turning it into something shippable on a schedule. I'm equally at home modernising a decade-old .NET system and standing up a greenfield NestJS platform. Alongside client work, I research smart contract security independently through Immunefi and Cantina bug bounty programs.The longer version - career, how I work, credentials →
Selected work
- WeWalk
Accessibility platform and smart cane ecosystem for visually impaired users.
Node.js · TypeScript · Express · Sequelize · PostgreSQL · Firestore - Sensium
Industrial IoT condition-monitoring and predictive maintenance SaaS.
NestJS · Drizzle ORM · PostgreSQL · TimescaleDB · MQTT · Redis - CodeHarden
LLM-powered code security scanning as a SaaS - SAST, dependencies, secrets and config in one audit.
NestJS · Drizzle ORM · PostgreSQL · Redis · BullMQ · Claude Agent SDK - İşeBaşla
Recruitment platform built on a layered clean architecture, split across 18 .NET projects.
.NET 8/9 · Blazor WebAssembly · .NET Aspire · EF Core · SQL Server · Hangfire - HocaCepte
Student-tutor Q&A marketplace with in-house trust & safety.
NestJS · TypeORM · PostgreSQL · Redis · BullMQ · MinIO - ModernMES
Multi-tenant manufacturing execution system (MES), delivered as a SaaS.
NestJS · TypeScript · Prisma · PostgreSQL · React · Vite
All projects → - including the lab: games, trading bots, AI tools, mobile apps and a wearable BLE device designed from PCB to cloud.
Security research
Since 2026 I've produced around 90 protocol assessments across perpetuals, lending, restaking and real-world assets, backed by a self-built research pipeline - static analysis, exploit-pattern matching against historical incidents, and Foundry fork proof-of-concepts against live deployments. More on methodology and tooling →
Contact
The fastest way to reach me is email:hello@huseyincinar.dev. My code lives at github.com/codebycinar.