Jobyer Ahmed

Cybersecurity Expert | OSCE3, OSCP, CNVP


As a cybersecurity expert with many years of professional experience and several notable certificates, such as OSCE3, OSED, OSWE, OSEP, OSCP, Pentest+, and others. I have a track record of doing high-quality security reviews for a wide range of clients globally. I am committed to keeping up with the latest methods and tools in cybersecurity. Whether working from home or on-site, I have a deep understanding of how to find weaknesses and come up with good ways to fix them. Contact me to learn how I can help keep you safe from modern cyber attacks.

  • Name: Jobyer Ahmed
  • Phone: +8801836830755
  • Contract Availability: Available
  • Country: Bangladesh
  • Workplace: Bytium
  • Work: Founder, Cybersecurity Expert
  • Website:
  • Email: hello(at)
Jobyer Ahmed | OSCE3, OSCP, CNVP

Certifications & Training

OSCE3 – 2023

  • Exploit Development
  • Red Teaming
  • Penetration Testing

I became the only OSCE(3) in Bangladesh. This is the final title I have received from OffSec.

OSED – 2023

  • Exploit Development
  • Reverse Engineering
  • Shellcode Writing

OSED or OffSec Exploit Developer is an extensive Training in Exploit Development that requires a good understanding of stack overflow, reverse engineering, assembly language, and shellcode writing.

OSWE – 2021

  • Source Code auditing.
  • Web Exploit Writing.
  • Advanced Web Exploitation.

OSWE, also known as OffSec Web Expert, is the training that forced me to understand web exploitation in-depth.

OSEP – 2021

  • Malware Development
  • Defense Bypass
  • Active Directory Exploitation

OSEP(OffSec Experienced Penetration Tester) is the advanced Ethical Hacking training where I developed my Red Teaming skills.

OSCP – 2020

  • Vulnerability Assessment
  • Penetration Testing
  • Thinking Out of The Box

OSCP, also known as OffSec Certified Professional, is a fundamental but still the hardest and gold standard training and certification in Penetration Testing that required me to think out of the box.

CNVP – 2020

  • Vulnerability Assessment
  • Penetration Testing
  • Pentest+, Security+

CNVP, or CompTIA Network Vulnerability Assessment Professional, is a technical security training awarded after a strict exam that requires an in-depth understanding of pen-testing methods.


Founder & CEO

RedNode – Present

  • Developing and maintaining the company’s overarching strategy, including the establishment of operating goals and the establishment of key performance indicators.
  • Managing the team, training the team members, and hiring talented cybersecurity professionals.
  • Offensive Security Research.
  • Lead the talented technical team.

Penetration Tester

Red Team Partners, UK – 2022

  • Vulnerability assessment,
  • Network penetration testing
  • Web application testing.
  • Report Writing

Cybersecurity Specialist

Cyber Armed Security, UK – 2021

  • Web application penetration testing.
  • Report writing.

Security Researcher

2012 to 2017

  • Network Penetration Testing
  • Web Application Testing
  • Vulnerability Assessment

Tech Support

2007 to 2016

I always loved to work with computers, such as building custom PCs. I worked to resolve various tech-related issues in OS and Software Configurations, locally and remotely worldwide. And at the same time, I started studying programming and cybersecurity without a mentor. I was known to be a Tech guy in my area.