🧑‍💻 Rei Reltroner (Raidan)

Backend / System Architect Engineer
Authentication Systems · Modular ERP · Long-Term Maintainability

Founder of Reltroner Studio — an independent engineering practice focused on building production-style internal systems with clear boundaries, strong guarantees, and disciplined scope control.

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🧭 Professional Orientation

I focus on systems that must not fail silently.

My work emphasizes:

• centralized authentication (SSO, OIDC, trust delegation),
• modular ERP-style architectures,
• failure isolation,
• and long-term sustainability over feature velocity.

I do not optimize for demos or short-term novelty.
I optimize for architectural correctness, auditability, and future-proof decisions.

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🧠 Core Principles

• Boundary Discipline
  Every system has explicit responsibilities. Auth is centralized once — never duplicated again.

• Correctness Over Speed
  A system that is slow to build but hard to break is preferable to a fast system that leaks complexity.

• Freeze What Must Not Change
  Critical layers (authentication, trust boundaries) are frozen once validated to prevent regressions.

• Documentation Is Part of the System
  Decisions, trade-offs, and failure modes are written — not assumed.

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🔧 Technical Focus

Backend & Architecture

• PHP 8+, Laravel 12
• RESTful APIs
• Multi-repository modular architecture
• ERP-style domain modeling

Authentication & Security

• Keycloak (OIDC, Authorization Code Flow)
• Centralized Identity Provider
• Short-lived JWT delegation
• Zero-trust service boundaries
• Session isolation (no shared cookies, no re-auth)

Data & Reliability

• MySQL
• Schema design & migrations
• Audit logging
• Transaction integrity

Testing & Delivery

• PHPUnit (feature & unit tests)
• GitHub Actions (CI)
• Production-style debugging & root cause analysis

Documentation

• Markdown-driven architecture docs
• Phase freeze & audit reports
• Explicit “what was not done — and why”

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📁 Selected Work

Reltroner ERP (Ongoing)

A modular ERP platform built entirely solo, designed to mirror real enterprise constraints.

Highlights:

• Centralized SSO Gateway using Keycloak
• Finance module integrated as a passive SSO consumer
• No shared sessions, no duplicated auth logic
• Explicit trust delegation via short-lived tokens
• Public audit reports & frozen authentication phases

This project is intentionally minimal in features but high in systemic complexity, focusing on long-term maintainability rather than surface polish.

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📄 Curriculum Vitae (Notion)

For a structured, up-to-date CV with detailed experience and artifacts:

👉 Notion CV:
https://immense-corn-a5c.notion.site/Raidan-Rei-CV-2f786ce37ade8083a9a5d0bfee103913?pvs=143

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🤝 Collaboration & Roles

I am open to:

• Backend / Platform / System Architect roles
• Authentication / IAM-focused work
• Internal tools & ERP platforms
• Remote or async-first collaboration

I work best in environments that value: clarity, trust boundaries, written communication, and long-term thinking.

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✉️ Contact

• Email: studio@reltroner.com
• Website: https://www.reltroner.com/blog/for-recruiters
• GitHub: https://github.com/Reltroner

“I don’t optimize for visibility.
I optimize for systems that remain correct long after the excitement fades.”

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