JA

Available for Q3 engagements

Findingwhatattackerswouldfind—beforetheydo.

I'm Jobyer Ahmed. I lead offensive security engagements and vulnerability research for teams that cannot afford to be wrong. Red-team operations, application and infrastructure testing, and advisory.

Read the writingGet in touch
~/jobyer
$ whoami
jobyer ahmed — offensive security researcher
$ certifications --list
OSCE³ · CISSP · OSCP · OSEP · OSWE · OSED · CNVP · Pentest+ · Security+
$ status
available for engagements
$
OSCE³

Flagship certification

Offensive Security Certified Expert 3 (OSEP + OSWE + OSED)

  • CISSP
  • OSCP
  • OSEP
  • OSWE
  • OSED
  • CNVP
  • PenTest+
  • Security+

9

certifications

What I do

Three practices. One operator.

Engagements are tailored, scoped jointly, and delivered with rigor — no shelfware, no boilerplate.

Primary practice

Red Team Operations

Adversary-emulated engagements that test people, process, and technology end-to-end.

  • Goal-oriented scenarios
  • Assumed-breach & full-scope
  • MITRE ATT&CK aligned

Track record

60+

Engagements delivered

7 cves credited

Vulnerability Research

Deep-dive research into applications, protocols, and appliances — with responsible disclosure.

Security Advisory

Executive-level guidance for leadership teams navigating risk, compliance, and incidents.

How I work

NDA-first · evidence-driven · findings delivered in plain language and in code.

Read approach

Advisories

Credited disclosures

A sample of CVEs published under coordinated disclosure.

All advisories

Writing

Latest notes

Research writeups, engagement learnings, and the occasional opinion.

Apr 14, 2026 · 7 min read

Hashcat Cheat Sheet

Hashcat is the most popular and faster hash cracker. In this cheat sheet we will see some quick usage of hashcat!

#hashcat#cheat-sheet#pentest

Apr 14, 2026 · 13 min read

Server-Side input validation testing

Here i have noted some server side input validation technique such as Sqli, RCE, SSRF etc

#sqli#rce#ssrf

Apr 14, 2026 · 1 min read

Microsoft Word Macro Payload

Deliver your reverse shell via Microsoft office macros

#powershell#office-macro#initial-access
All writing

Engagements

Need an attacker's perspective?

I take a small number of engagements per quarter. If yours is time-sensitive, mention it in the note.

Start a conversation

[email protected]