I build production-grade platforms end-to-end — from QR-table ordering systems with concurrency-safe payment logic to deterministic prompt architectures that constrain LLMs into behaving like senior engineers instead of autocomplete.
My focus is shipping software that survives contact with the real world: atomic database writes, OWASP-enforcing code agents, and SaaS platforms designed for 3–5 year LTS horizons. Not demos.
const yusuf: Engineer = {
base: ["TypeScript", "React 19", "Node.js", "Express"],
data: ["MongoDB", "Mongoose"],
infra: ["Docker", "Vite", "GitHub Actions", "Nginx"],
ai: ["LLM constraint systems", "Agentic pipelines", "Prompt architecture"],
practices: ["Security-first design", "Zero-truncation policies", "Testing gates"],
languages: ["Turkish (native)", "English (professional)"],
};jousef-skill — Deterministic Framework Constraint Protocol
A compiled, 12-module system-prompt architecture that turns LLM code agents into disciplined principal engineers: full OWASP Top 10 enforcement, MANDATORY/CONDITIONAL/DEFAULT rule tiers with a precedence ladder, testing coverage gates that block termination, and a terminal compliance verification gate. Born from refusing to accept // TODO placeholders and hallucinated tech stacks.
saas-coffee-react — Bancho Cafe · Brew & Bloom
A three-role SaaS ecosystem (customer / staff / admin) for real café operations: QR table ordering, concurrency-safe loyalty and wallet logic (atomic $inc, $elemMatch claims, purpose-bound QR tokens), 7-language i18n, multi-currency, Web Push notifications, and Docker deployment. Hardened through systematic security simulation — 20+ findings fixed and documented.
Determinism over vibes. LLMs are probabilistic; production systems can't afford to be. I build constraint systems that make AI output verifiable.
Security is not a feature flag. OWASP enforcement, JWT purpose-binding, atomic writes — designed in from commit one, not patched in after an incident.
Ship for the LTS horizon. Version-locked dependency matrices, expand/contract migrations, and compliance gates that refuse to let work finish half-done.
- Kodyazar Topluluğu — Turkish software community
- AI tooling — Building and refining agentic workflows that respect both speed and correctness
- Open to — Full-stack and AI engineering roles, ambitious product collaborations