How to Become a Security Engineer

What security engineers do

Security engineers protect a company's systems and web services. The job has three main areas: vulnerability assessment (finding weaknesses before attackers do), incident response (investigating breaches after they happen), and SOC (Security Operations Center) monitoring (24/7 surveillance of traffic). Beyond defense, the role includes containing damage when an attack occurs, recording the cause to prevent recurrence, and educating employees on safe practices.

Three specializations

Fig. 1: SOC → Incident Response → Vulnerability Assessment. With 5+ years of experience, ¥8.5M median is in sight

Beginners typically start with SOC monitoring, building experience reading large volumes of attack logs. After 3–5 years they move into incident response or vulnerability assessment. Vulnerability assessment (the "white-hat hacker" work) commands the highest pay and deepest expertise.

That said, the path isn't linear for everyone. Some move from web development into vuln assessment; others go from network operations into SOC; others expand from internal IT admin into security management. Security isn't an isolated island — it connects to web, networking, cloud, law, and education.

Required skills

Fig. 2: 5 of 8 skills are accessible. Attack technique practice must happen on legal platforms like TryHackMe — no exceptions

Security demands both breadth and depth — touching web, networking, OS, cryptography, and law. the straightforward starting point is Linux: get comfortable with a terminal and basic commands, then work outward from there.

How teens should approach this field

The first rule in security is never attack systems without permission. In Japan, the Unauthorized Computer Access Law applies to minors too — violations can result in criminal referral. Use legal practice platforms like TryHackMe or Hack The Box. Teens can also enter beginner CTF (Capture the Flag) competitions such as SECCON Beginners and ICT-Toranomon within Japan.

In your first six months, prioritize foundations over attack techniques. Practice: finding files in Linux, reading logs, understanding IP addresses and port numbers, writing simple string processing in Python, explaining how HTTPS and password managers work. With this foundation, CTF challenges and vulnerability assessment tutorials will make much more sense.

Watch out for these pitfalls

3 things security-focused teens must avoid

Running "experiments" on friends' or school systems. Unauthorized Computer Access Law violations have led to criminal referrals involving minors.
Using tools to intercept others' traffic on public Wi-Fi. This is also illegal.
Watching YouTube "hacking videos" and thinking you've gained real skills. Actual practice must happen in legal environments like TryHackMe.

How this helps your future

Security engineers are in demand at penetration testing firms, major banks, telecoms, cloud companies, government agencies, and the IT departments of schools and local governments. Pay and work style vary widely, but people who can read English threat intelligence, explain findings from logs, and act with legal and ethical integrity are consistently valued.

Start today

3 steps to get going

Register for a free TryHackMe account and complete the first Beginner course mission
Set up a Linux (Ubuntu) virtual machine on your home PC and run the ls command in the terminal
Look at one past problem from SECCON Beginners, Japan's entry-level security competition

Summary

Security engineering splits into three areas: vulnerability assessment, SOC monitoring, and incident response. It's a high-demand, well-compensated field facing a serious talent shortage. Core skills: networking, Linux, programming, and understanding attack techniques. All practice must happen in legal environments (TryHackMe, CTF competitions). Teens can absolutely start here — and the social impact is enormous.

Check The entry to security work is?