Asım Sezai Ceylan

Network Engineer | NetDevOps & Automation | Multi-Cloud Infrastructure (AWS/GCP/Alibaba/On-Prem) | Network Security

Istanbul, Türkiye

About

​I am a Network Engineer specializing in NetDevOps, Multi-Cloud Architecture, and High-Availability Infrastructure. With a background in Digital Forensics Engineering and Software Development, I bridge the gap between traditional core networking and modern, software-driven cloud environments. ​My core focus is replacing manual network operations with robust Python-based automation, designing secure multi-site architectures (AWS, GCP, Alibaba Cloud, On-Prem Clouds), and integrating security/reliability validations directly into infrastructure CI/CD pipelines. I thrive in complex, cross-functional environments, particularly building zero-trust, high-availability networks for highly regulated business units like Fintech, and for highly scalable private clouds.

Experience

  • Trendyol Group (Full-time · 5 yrs 1 mo)
    • Network Engineer
      Jan 2023 - Present · 3 yrs 6 mos

      - Co-architecting and deploying highly resilient, zero-trust network architectures for critical Fintech businesses. - Architecting and securing multi-cloud hybrid fabrics across AWS, GCP, and Alibaba Cloud. - Engineering custom Python-based NetDevOps solutions, pipelines and state-synchronization engines. - Modernizing network observability stacks via GitOps, utilizing advanced Splunk (SPL), Prometheus, and Grafana. - Executing zero-impact physical production firewall migrations using Infrastructure as Code (IaC) principles. - Facilitating cross-functional security initiatives, including PCI-DSS compliance audits and recurring DDoS simulations. - Partnering with SRE and Platform teams to design unified incident response dashboards and highly scalable private clouds. - Analyzing complex protocol-level network anomalies utilizing Digital Forensics principles.

    • Associate Network Engineer
      Jun 2021 - Jan 2023 · 1 yr 8 mos

      - Assisting to Design, Secure and Hyper-Scalable Networks. - Implementing and Maintaining monitoring and alarm systems based on multiple solutions. ( Splunk, Grafana , Telegraf, Prometheus etc.. ) - Benchmarking Container and Hypervisor level networks. - Assisting Kubernetes CNI level network designs. - Managing and Securing multi vendor firewalls. - Implementing and Assisting modern Datacenter Networking solutions. - Implementing ans Assisting automation and IAC processes. - Assisting DDOS tests. - Assisting Security Compliance's. - Analyzing and creating cases based on traffic & system logs.

  • Software Engineer Intern at Gais Siber Güvenlik Teknolojileri
    Aug 2020 - Jan 2021 · 6 mos

    - Helped Software Development Team to create unittests with Selenium. - Worked to create a massive dataset about cookies and their relationship with KVKK & GDPR. - Worked with Red Team in Web Application Pentesting Cases.

  • Network Intern at ePati Bilişim Teknolojileri
    Jun 2019 - Sep 2019 · 4 mos

    - Benchmarking New Generation Firewalls and UTMs. - Developed a Trex-64 based statefull benchmarking solution.

  • Cyber Security Intern at Cyberlab
    Jun 2018 - Jul 2018 · 2 mos

    - Helped Penetration Testing on live servers. - Building Linux Servers via Vmware Esxi. - Managing Linux Servers. - Helped Penetration Testings on Mobile Applications.