Looks like you have JavaScript disabled. For the full Twine experience, you will need to re-enable it.

Hi, I’m Nicholas Doropoulos, a security architect with 10+ years of hands-on experience building secure Linux, containerized, and cloud-based IT infrastructures. I specialize in SecDevOps, Kubernetes, cloud security, IAM, automation, and AI-enabled orchestration, delivering resilient architectures and automated workflows that accelerate secure delivery. My work focuses on reducing risk while enabling teams to move faster in dynamic environments. My efforts have been recognized with AWS security awards and I’ve shared knowledge through AWS blogs, Re:Post, YouTube, and health-sector cybersecurity centers. I’m also a bestselling Udemy instructor with thousands of students around the world, committed to teaching practical security and cloud engineering skills that scale.…Hi, I’m Nicholas Doropoulos, a security architect with 10+ years of hands-on experience building secure Linux, containerized, and cloud-based IT infrastructures. I specialize in SecDevOps, Kubernetes, cloud security, IAM, automation, and AI-enabled orchestration, delivering resilient architectures and automated workflows that accelerate secure delivery. My work focuses on reducing risk while enabling teams to move faster in dynamic environments. My efforts have been recognized with AWS security awards and I’ve shared knowledge through AWS blogs, Re:Post, YouTube, and health-sector cybersecurity centers. I’m also a bestselling Udemy instructor with thousands of students around the world, committed to teaching practical security and cloud engineering skills that scale.

Nicholas Doropoulos

Cloud Developer, DevOps Developer, AI Engineer, +2





Hi, I’m Nicholas Doropoulos, a security architect with 10+ years of hands-on experience building secure Linux, containerized, and cloud-based IT infrastructures. I specialize in SecDevOps, Kubernetes, cloud security, IAM, automation, and AI-enabled orchestration, delivering resilient architectures and automated workflows that accelerate secure delivery. My work focuses on reducing risk while enabling teams to move faster in dynamic environments. My efforts have been recognized with AWS security awards and I’ve shared knowledge through AWS blogs, Re:Post, YouTube, and health-sector cybersecurity centers. I’m also a bestselling Udemy instructor with thousands of students around the world, committed to teaching practical security and cloud engineering skills that scale.…Hi, I’m Nicholas Doropoulos, a security architect with 10+ years of hands-on experience building secure Linux, containerized, and cloud-based IT infrastructures. I specialize in SecDevOps, Kubernetes, cloud security, IAM, automation, and AI-enabled orchestration, delivering resilient architectures and automated workflows that accelerate secure delivery. My work focuses on reducing risk while enabling teams to move faster in dynamic environments. My efforts have been recognized with AWS security awards and I’ve shared knowledge through AWS blogs, Re:Post, YouTube, and health-sector cybersecurity centers. I’m also a bestselling Udemy instructor with thousands of students around the world, committed to teaching practical security and cloud engineering skills that scale.

Available to hire

Hi, I’m Nicholas Doropoulos, a security architect with 10+ years of hands-on experience building secure Linux, containerized, and cloud-based IT infrastructures. I specialize in SecDevOps, Kubernetes, cloud security, IAM, automation, and AI-enabled orchestration, delivering resilient architectures and automated workflows that accelerate secure delivery. My work focuses on reducing risk while enabling teams to move faster in dynamic environments.

My efforts have been recognized with AWS security awards and I’ve shared knowledge through AWS blogs, Re:Post, YouTube, and health-sector cybersecurity centers. I’m also a bestselling Udemy instructor with thousands of students around the world, committed to teaching practical security and cloud engineering skills that scale.

Skills

Experience Level

Expert

Expert

Expert

Expert

Language

Greek, Modern

Fluent

English

Fluent

Work Experience

Cyber Security Engineer at Fiverr Pro

January 1, 2023 - Present

Wrote IAM policies for AWS environments. Troubleshooted Kubernetes clusters. Designed secure AWS landing zones. Designed DDoS-resilient architectures for AWS-hosted workloads. Built CI/CD pipelines and automation to improve deployment speed.

Cloud DevSecOps Lead Engineer at atHomeGroup

November 1, 2014 - April 1, 2015

Managed the company’s AWS-hosted infrastructure with CloudFormation and Ansible. Designed and implemented the organisation’s IAM governance strategy. Implemented Jira automation workflows. Reduced attack surface with Bash and Python tools. Built CI/CD pipelines with GitHub, BuildKite, ECS, ECR and CloudFormation. Investigated and remediated security incidents. Troubleshooted ECS-hosted workloads and MariaDB databases. Identified cost optimization opportunities.

Senior Cloud and Network Security Architect at European Parliament

October 1, 2003 - May 1, 2004

Optimised networking connectivity between cloud-hosted and on-premise infrastructure. Contributed to strengthening the security posture against DDoS attacks. Carried out security audits of the infrastructure against compliance frameworks.

Cloud Security Engineer at Amazon Web Services

February 1, 2020 - September 1, 2023

Mitigated live L3/4 and L7-based DDoS attacks targeting customer workloads. Conducted DDoS simulation exercises. Responded to detected threats by analyzing alerts, containing incidents, and implementing corrective actions. Helped customers build PKIs. Resolved 1,000+ technical cases and escalations. Deflected 40,000+ support cases through blogs, KC articles and YouTube videos. Delivered training to junior engineers and various teams.

3rd Line Network Security Engineer at Integrity 360

April 1, 2019 - February 1, 2020

Provided incident management and regular client updates. Led a team to patch Check Point firewalls at scale. Delivered onsite and remote support to strategic customers. Acted as a Subject Matter Expert for Check Point technologies.

Senior Network Security Engineer at NGS

September 1, 2018 - April 1, 2019

Performed on-site migrations of physical Check Point firewalls and migrations from SonicWall to Check Point. Responded to EDR incidents and performed vulnerability scans. Provided 3rd line technical support.

2nd Line Network Security Engineer at Secure Data

April 1, 2018 - August 1, 2018

Provided 2nd line support across Cisco, Check Point, Fortinet and Aruba. Acted as Subject Matter Expert in Check Point and Fortinet technologies. Managed call queues and SLA adherence. Delivered training to 1st line engineers.

2nd Line Network Security Engineer at Capita Cyber

October 1, 2017 - April 1, 2018

Provided 2nd line support across multiple vendors, VPN tunnel troubleshooting. Delivered training to 1st line engineers.

1st Line Network Security Engineer at Smoothwall

June 1, 2017 - October 1, 2017

Helped customers set up and configure Smoothwall firewalls and proxies. Implemented content filtering. Troubleshooted highly complex cases involving a range of networking protocols.

Assistant Network Manager at Newsome High School

May 1, 2016 - May 1, 2017

Managed a school computer network of 600 users. Maintained and operated an Active Directory forest. Deployed Mac Minis and desktops across classrooms; Led a team of two technicians.