Hi, I'm Marcelius — I secure and automate enterprise IT.
I work in the Data Center division at Indomobil Group, where I focus on network security monitoring, penetration testing, and building PowerShell/Python automation for enterprise IT operations. I graduated from Bina Nusantara University with a major in Computer Science, specializing in Cyber Security.
Experience
From campus leadership to enterprise cyber security and IT infrastructure.
- Implemented network security controls and monitored logs from CheckPoint and Sentinel to detect and prevent internal and external threats.
- Designed and executed proof-of-concept penetration tests for web applications and in-house Android apps, covering phishing, brute-force attacks, SQL injection, XSS, and DDoS.
- Conducted static/dynamic analysis, app reverse engineering, network interception, and secure authentication/storage testing using MobSF, Burp Suite, Frida, JADX, and APKTool.
- Identified and documented vulnerabilities against the OWASP / OWASP Mobile Top 10 and collaborated with developers to remediate and verify fixes.
- Planned and designed network infrastructure, including topology optimization, device configuration, and integration between hardware and software.
- Maintained network and server performance through monitoring, routine maintenance, and data analysis to ensure stability and efficiency.
- Assisted with email and IP address data collection for operational and security purposes.
Assisted new students in adapting to university life by providing academic information, introducing campus organizations, and helping with academic challenges. Monitored students' progress in both academic and non-academic areas, fostering two-way communication for a supportive university experience.
Delivered explanations of IT and Python material to students at Cahaya Bangsa Classical School, preparing presentation materials for effective learning. As assistant lecturer for HIMTI Responsi, explained Scientific Computing (Python) material for exams and supported peers facing difficulties.
Projects
Enterprise tools I designed and built to automate and secure IT operations at Indomobil Group.
IMG Deployer
An automated PC/laptop provisioning system that turns a multi-hour manual IT setup into a guided, one-USB workflow — pairing a PowerShell/WinForms deployment tool with a Python (Flask) + MySQL backend.
- Automates disk partitioning, software installation, Active Directory domain join, and EDR (SentinelOne) enrollment for every new company device
- Syncs asset and deployment data into the corporate inventory system via a secured REST API
- Zero-trust by design: no credentials are ever stored in the distributed tool — secrets are released only after an HMAC-SHA256 authentication gate verifies live Active Directory credentials
- All directory communication runs over Kerberos-sealed and signed LDAP
UserDC — AD Provisioning Tools
A PowerShell (WinForms) automation tool that streamlines the entire Active Directory user lifecycle for the IT team, replacing a series of manual, error-prone admin tasks with a guided point-and-click workflow.
- Creates accounts individually or in bulk from pasted new-hire templates, with duplicate-account checking
- Bulk-disables and relocates resigned employees' accounts, auto-detecting records from pasted HR data
- Edits user domains/logons with a live email-alias (proxyAddress) preview before applying changes
- Pulls pending new-hire requests directly from an internal HR ticketing API into the account-creation form
- Remotely triggers Azure AD Connect Delta Sync over WinRM so changes propagate to Azure AD / Exchange Online instantly
Skills & Technologies
The tools and disciplines I use across security testing, infrastructure, and automation.
Organizations
Campus organizations where I built leadership and collaboration skills.
Keluarga Mahasiswa Katolik BINUS
> Coordinator of Public Relations (2023)
> Coordinator of Equipment (2022)
Volunteering
Event and community contributions during my time at BINUS.
HIMTI — Staff of Concept and Design — HINGAR — 2022
- Collaborating to create design concepts
- Designing virtual backgrounds, PowerPoint presentations, and posters
- Using Figma and Adobe for design purposes
HIMTI — Staff of Equipment — TECHNO — 2022
- Collaborating to list the required needs
- Negotiating to reach agreements with vendors
- Serving as the moderator on Zoom and YouTube during the event
KMK — Vice President New Student Admission — 2022
- Assisting the president in the smooth execution of events
- Conducting progress meetings for each division
- Ensuring the seamless flow of events
- Assisting coordinators in each division when facing challenges
- Evaluating each event that takes place
- Providing reports and receiving feedback from the advisor
KMK — Coordinator of Equipment, Studi Banding Telkom University — 2022
- Leading meetings in the equipment division
- Organizing work schedules
- Serving as moderator in discussion sessions
BINUS — Co-Host, Webinar PIT AIA — 2022
- Opening the Zoom room for hosting the webinar
- Contacting participants
- Assisting with technical issues and documenting the proceedings
Let's work together
I'm always open to discussions and collaborations. If you have ideas to share or are interested in working together, let's connect.
Message me on LinkedIn