I build production systems and keep them running.
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-foundedModern 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.
Selected work
- WeWalk
Accessibility platform and smart cane ecosystem for visually impaired users.
Node.js · TypeScript · Express · Sequelize · PostgreSQL · Firestore - Pulse
Industrial IoT condition-monitoring and predictive maintenance SaaS.
NestJS · Drizzle ORM · PostgreSQL · TimescaleDB · MQTT · Redis - İşeBaşla
Recruitment platform built as an 18-project clean-architecture solution.
.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
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:codebycinar@gmail.com. My code lives atgithub.com/codebycinar.