Er Song Kai

Empowering people through technology

Who I Am

I believe technology has the power to protect and connect people, and that belief has shaped everything I've pursued in tech. I was drawn to cybersecurity first, through years of Capture-the-Flag (CTF) competitions, earning multiple certifications and building digitally inclusive and secure tools. As a computer science undergraduate at National University of Singapore (NUS), I find myself thinking less about breaking systems and more about building ones worth trusting. Security isn't something I'm moving away from, it's the foundation I built for everything I stand for now.

Where I Studied

Aug 2025 – Present

National University of Singapore

Bachelor of Computing in Computer Science (with Honours)

Mar 2020 – May 2023

Singapore Polytechnic

Diploma in Infocomm Security Management (with Merit)

GPA 3.89 · Distinctions in 6 modules

What I've Done

Sep 2022 – Feb 2023

Defence Science & Technology Agency

Cybersecurity Intern

  • Developed an automated vulnerability detection programme for Infrastructure-as-Code files.
  • Designed PowerShell scripts to deploy AWS instances and web app environments for vulnerability testing.
Jun 2023 – Aug 2023

DSO National Laboratories

Technical Staff

  • Managed sustainment of a fleet of high security workstations.
  • Ran benchmarks to ensure highly performant compute for the organisation.
Mar 2024 – Jun 2024

Republic of Singapore Air Force

Pilot (Trainee)

  • Deployed to Australia for Pilot Training on the CT-4B plane platform.
  • Underwent leadership training and familiarised with air power capabilities and defence policy.

What I've Built

Phishless

A final-year project co-developed at Singapore Polytechnic to educate users on identifying and mitigating phishing and related cyber threats.

Security Python Team Project

CTF Writeups

Solutions and write-ups from 30+ competitive CTF events worldwide, covering web exploitation, binary analysis, cryptography, and more.

CTF Writeups Security Research

How I Lead

Obelus

Vice Captain · Apr 2020 – Present

Tech Competition Team. Recruited and grew the team to 10+ members. Competed in 30+ events worldwide with SGD 11,000+ in winnings.

30+Events
$11k+Winnings
10+Members

SP School of Computing Club

President · Sep 2021 – May 2022

Organised meaningful events for the School of Computing student body and directed the Executive Committee from ideation to post-event wrap-up.

1,000+Students

SP Students' Union

Council Member · Apr 2021 – May 2022

Oversaw and organised social, cultural, educational, and sports activities across the entire student body.

16,000+Students

Recognition

Honours & Awards

  • Cyber Defenders Discovery Camp 1st Runner-up · Jun 2022
  • UMass CTF 2022 8th place out of 300+ teams · Mar 2022
  • Lag'n'Crash CTF 2022 1st Runner-up · Mar 2022
  • DSTA Polytechnic Digital Scholarship Sep 2021 – May 2023
  • AiSP SVRP Award Gold Sep 2022

Certifications

  • Offensive Security Certified Professional Jun 2023
    Verify
  • eLS Web Application Penetration Tester Jun 2022
    Verify
  • eLS Junior Penetration Tester Oct 2021
    Verify
  • Organisational Security System Analyst Oct 2021
    Verify
  • AWS Certified Cloud Practitioner Sep 2021
    Verify

Let's Talk

Open to collaborations and interesting conversations.