Backend Developer · System Engineer · Security Enthusiast
Informatics Engineering @ Universitas Siliwangi · Tasikmalaya, Indonesia
Backend developer and system engineer focused on building reliable internal systems, server infrastructure, and security-aware solutions. Currently interning at PT. Padud Jaya managing production servers and deploying full-stack enterprise applications.
Started programming during high school — self-taught Python and web fundamentals, then expanded into backend engineering, ethical hacking, and AI/ML during university. Member of the ethical hacking specialization group (JKF) at UNSIL.
const fajar = {
role : "Backend Developer & System Engineer",
education : "Informatics Engineering — UNSIL (Active)",
internship : "IT Intern @ PT. Padud Jaya",
focus : ["Backend Systems", "Server & DevOps", "Security", "AI/ML"],
available : true, // open to freelance
};Focused on backend systems, server infrastructure, and security-aware development.
Languages & Runtimes
Backend & API
Frontend (supporting)
Database & Infrastructure
Security & AI/ML
Tools
Enterprise-grade HR and payroll system deployed in a real production environment across multiple company divisions.
| Stack | Java · Spring Boot · Next.js · React · PostgreSQL · Tailwind CSS |
| Status | 🟢 Production |
| Scope | Role-based access (HRD & Accounting), dynamic payroll with BPJS deduction, salary slip PDF export, multi-location support, bulk Excel import |
ML-based web attack detection pipeline comparing multiple models on the CSIC 2010 HTTP dataset.
| Stack | Python · Scikit-learn · Jupyter Notebook |
| Status | 🔵 In Development (Final Project) |
| Scope | Random Forest, Isolation Forest & SVM/Logistic Regression comparison; .joblib model export; demo website |
Post-attack forensic reconstruction system using ML and Gemini API integration.
| Stack | Python · Gemini API · ML Pipeline |
| Status | 🔵 In Development (Final Project) |
| Scope | Log analysis, attack timeline reconstruction, AI-assisted reporting |
Controlled Man-in-the-Middle attack simulation in an isolated lab environment.
| Stack | Kali Linux · hostapd · dnsmasq · iptables · Wireshark |
| Status | ✅ Completed |
| Scope | Rogue AP setup, DHCP/DNS spoofing, packet sniffing and HTTP/HTTPS traffic analysis |
Available for freelance projects — backend systems, API development, server setup, or full-stack web applications.
| Platform | Link |
|---|---|
| 🌐 Portfolio | fajargeran.my.id |
| 💼 Upwork | upwork.com/freelancers/~0161b57f32127352e8 |
| 🎯 Sribu | sribu.com/id/users/FajarGeran |
"Build things that matter, secure things that count."
── grnlogic ──