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Field Notes

E18 · Woori FIS · Feb 2026 – Oct 2026

Explaining in the language the other person already knows

  • Documentation
  • Security Group
  • Onboarding
Physical firewall policySecurity group policySourceDestinationPortAllow or denyReasonSourceDestinationPortAllow or denyReasonSame structure
Both tables align in the same structure, and matching cells connect with lines.

In one line

I documented security group policies in the physical firewall format the team already knew, so engineers new to AWS could start work right away.

Background

The organization’s network and security staff knew physical firewall policies well, but AWS security groups (virtual firewalls in front of servers) were new to them.

What I did

I documented security group policies in HTML, using the same structure as the existing physical firewall policy: source, destination, port, allow or deny, and reason. The document also explains one key difference. Security groups are stateful, so response traffic is allowed automatically.

I also wrote an operations guide for new staff, covering how to access AWS, which resources to check in the console, and how to use the Python tools.

Result

New staff could start work right away by connecting AWS to what they already knew, without studying AWS concepts from scratch.

Open to work · Cloud infrastructure and security