SYS:OKSHELL://itsfm.net
Encrypted Channel · TLS 1.3
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// ClassifiedL4
SubjectHans
Threat LevelCLASSIFIED
ClearanceL4 · UNRESTRICTED
// Specialization
Full Stack Cyber Security Systems CTF

PWNED.

DEV/SEC // Remote · itsfm.net
Role_Full-Stack + Cyber Sec
Stack_C/C++ · Python · Java · Go
Reading_B.Sc. Cyber Security / BINUS
Status_Lab Assistant · CTF
01

Who is Hans?

// DossierCyber Security undergrad. Builds systems, breaks them on purpose, repeats.
I build software that holds up under pressure, and break it on purpose when it shouldn't. Currently learning to do both faster.

I'm Hans Kartawinata, a Cyber Security undergrad at Universitas Bina Nusantara and a full-stack developer who treats "works on my machine" as a personal insult. Most of my week is spent as a Junior Lab Assistant at BINUS's Software Laboratory Centre, running hands-on sessions for Computer Networks, Computer Vision, and Mobile Hybrid Solutions, and writing the practical exam cases other students will eventually curse at.

The rest goes to PETIR Cyber Security, BINUS's competitive CTF team, and the Cyber Security Community, where I serve as R&D Activist designing challenges I hope at least one teammate finds annoying. Reverse engineering, cryptography, and forensics are the categories I keep coming back to.

I write Go for things that must not stop, Rust for things that must not fail, and Python for everything I'd rather not write twice. Open to internships, collaborations, and CTF teamups.

  • C / C++92
  • Python88
  • Linux86
  • Java84
  • C#82
  • Networking · Cisco82
  • Go / Backend80
  • RE · Crypto78
  • TypeScript / Vue76
  • Rust / Tauri74
  • Docker · gRPC70
02

Activity log.

// Roles & EducationWhere I show up most weeks. Click a row to expand, or just take my word for it.
TimeframeRoleOrg · NotesStatus
2025·08 → now Lab Asst Software Laboratory Centre · BINUS · Lab sessions, practical exam design & student mentoring Active
2025·05 → 2025·08 Apprentice PETIR Cyber Security · CTF · RE · Crypto · Forensics Completed
2025·02 → 2026·02 R&D Activist Cyber Security Community (CSC) · BINUS · Challenge designer Completed
2024 → now Undergrad B.Sc. Cyber Security · Universitas Bina Nusantara In Prog.
2026·05 Cert OPSWAT ICIP · Critical Infrastructure Protection Issued
2026·05 Cert Endpoint Security · Cisco Issued
2026·03 Cert Azure AI Fundamentals · Microsoft AZ-900 Issued
2026·02 Cert Networking Basics · Cisco Issued
03

The stack.

// InventoryThings I reach for without re-reading the docs.

// Languages

  • Go
  • TypeScript
  • Rust
  • Python
  • C / C++
  • C#
  • Java
  • Dart
  • SQL

// Frameworks

  • Vue 3
  • SvelteKit
  • Tauri
  • Flutter
  • Three.js
  • JavaFX
  • Unity
  • gRPC · REST

// Infra · Data

  • Docker
  • Traefik
  • PostgreSQL
  • Redis
  • RabbitMQ
  • MinIO
  • SQL Server
  • Linux

// Tools · Recon

  • Burp Suite
  • Cisco Packet Tracer
  • Postman
  • Visual Paradigm
  • Git
  • Figma
  • XAMPP
04

Open a ticket.

// ChannelEncrypted preferred. Plaintext tolerated. Recruiter spam composted.

Talk to Hans.

// Availability Open to remote · freelance · CTF teamups
Response time: usually < 24h on weekdays
// AWAITING_TRANSMISSION