For Recruiters & Collaborators
Hello —
I'm Rei Reltroner (Raidan Sandra), a backend/system engineer specializing in deterministic systems, modular architecture, and secure authentication flows.
I focus on building systems that are not just functional — but auditable, predictable, and production-resilient.
Fast Professional Overview
Role Positioning
Backend / System Engineer
Primary Focus
- Backend engineering (Laravel, PHP ecosystem)
- Modular system architecture (ERP, platform systems)
- Deterministic data flow & system behavior
- Authentication systems (OIDC / SSO / JWT)
- System integrity, auditability, and reliability
Core Strengths
- Turning ambiguous requirements into structured, production-ready systems
- Designing modular, scalable architectures (service isolation, layered design)
- Building deterministic systems (single source of truth, predictable outputs)
- Implementing secure authentication (Keycloak OIDC, JWT RS256, OAuth2)
- Handling financial-grade data integrity (immutability, audit logging, snapshot validation)
- Debugging complex multi-layer issues (UI, SSR, state, API, infra)
- Writing structured documentation (incident reports, failure analysis, ADRs)
Professional Approach
I build systems with principles:
- Deterministic over implicit behavior
- Immutability over mutation risk
- Clarity over cleverness
- System boundaries over tight coupling
- Auditability over hidden state
My goal is to ensure that systems:
- Behave predictably under load and edge cases
- Can be debugged without guesswork
- Are safe to evolve without breaking core integrity
Work Experience
Full-Cycle Solutions Associate — Skill-Wanderer (Remote)
March 2026 – Present
Working in a distributed engineering team (Vietnam / EU) delivering full-cycle product systems.
Key Contributions:
- Re-architected monolithic course system into modular, factory-driven architecture
- Eliminated dual source-of-truth issues, ensuring deterministic UI-state synchronization
- Debugged complex issues across layers (SSR mismatch, reactive bugs, UI blocking)
- Applied structured Git workflows (clean rebuild, selective restore) for production-grade PRs
- Owned full lifecycle: architecture → implementation → debugging → delivery
Impact:
- Reduced bug risk by ~25% via deterministic lifecycle handling
- Enabled scalable reuse across platform ecosystem
- Improved system reliability and production readiness
Project Highlight — Reltroner ERP Ecosystem
Role: Backend Engineer (Independent Project)
Stack: Laravel 12, PHP 8.2+, MySQL, Keycloak (OIDC), GitHub Actions
Period: March 2025 – Present
A modular ERP platform with centralized authentication and audit-grade financial systems.
Architecture Highlights:
- Multi-service system (Gateway, HRM, Finance)
- Centralized SSO using Keycloak (OIDC)
- Immutable transaction system (append-only + reversal model)
- Audit logging + fiscal locking system
- Snapshot-based financial reporting (deterministic outputs)
System Scale:
- 3 independent repositories
- 150+ automated tests (unit, feature, regression)
- 100+ database migrations
Impact:
- Delivered HRM & Finance modules end-to-end in ~6 months
- Reduced onboarding time by ~20% via structured documentation
- Ensured audit-safe financial reporting with deterministic guarantees
Live HRM Demo:
hrm.reltroner.com
Repositories:
Documentation:
- github.com/Reltroner/error-documentation
- github.com/Reltroner/progress-documentation
- github.com/reltronersk/skill-wanderer-progress-documentation
System Engineering Capabilities
Backend & API
- Laravel 12, PHP 8.2+, Node.js
- RESTful APIs, service isolation
Architecture
- Modular systems
- Dependency Inversion
- Layered architecture
- Deterministic system design
Authentication & Security
- Keycloak (OIDC / SSO)
- JWT (RS256), OAuth2
- Trust boundary enforcement
- Secret remediation & Git history rewriting
Database
- MySQL, PostgreSQL, SQLite
- Schema design & migrations
- Transaction integrity & audit logging
DevOps
- GitHub Actions (CI/CD)
- Docker, SSH, DNS/SSL
- Environment hardening
Testing
- PHPUnit (unit, feature, regression)
- Failure-mode analysis
- Deterministic validation
Documentation
- Incident reports
- Architectural Decision Records (ADR)
- Failure analysis & audit documentation
Notable Engineering Incident
Security Incident — RSA Key Exposure
Handled a real-world security incident involving exposed RSA key.
Actions:
- Rewrote Git history using
git filter-repo - Removed all secret traces and sanitized repository
- Implemented preventive controls (pre-commit hooks, .gitignore)
Result:
- No production impact
- No key compromise
- Improved overall security posture
This reflects my ability to handle high-risk engineering situations with control and precision.
Education
Universitas Andalas — Information Systems (Coursework)
Certifications
Availability
I’m currently open to:
- Backend Engineer roles (Laravel / PHP)
- System / Platform Engineering roles
- SaaS or product-focused teams
- Remote-first or distributed environments
Contact
📧 studio@reltroner.com
🌐 reltroner.com
💻 github.com/Reltroner
💻 github.com/reltronersk
🔗 linkedin.com/in/rei-reltroner
Full CV
You can view my full CV here:
📄 Rei's CV