Sign in

Security Services Expert

Uskudar, Istanbul, Turkey
60.000 USD (annually)
March 20, 2020

Contact this candidate




Ahmet Abdullah




Nationality: Turkish

Sex: Male

Marital Status: Married

Birth: 30.11.1988

Driving License: yes


Istanbul Technical University 2006 – 2011, Control Engineering





Skype ID: abdullah.okumus1


Network Security Expert – ADC(s) Expert


Load Balancers

NetScaler, F5, Nginx, Cisco ACE


Checkpoint, Fortigate, Cisco ASA, Juniper, Palo Alto, Firepower

Intrusion Prevention Systems

Sourcefire, Checkpoint, Fortigate


Juniper, Cisco ASA, Checkpoint, Fortigate

Web/Email Security Gateways

Websense, Proofpoint

DDoS Mitigation


Server Virtualization Infrastructures

VMware, XenServer

Network/HTTP Analyzing Tools

Wireshark, HttpFox




Tufin, Cisco ISE, Vasco


Security Services Expert

Vodafone Turkey

2016 – Present, Istanbul, Turkey

Role details:

I have worked as a security services expert at Managed Security Service Provider (MSSP) team of Vodafone Turkey.

My primary job is NetScaler Load balancing (LB) and Web Application Firewall (WAF) configuration here. HTTP, HTTPS, TCP, DNS LB are just some examples of load balancer configuration I made. In the WAF part, I created WAF profile regarding to OWASP-10 vulnerabilities for every customers who requesting HTTP Layer-7 protection to their web sites. Furthermore, designing of customer’s LB topologies is one of my LB jobs here.

Another significant job I am doing here is new customer implementation that includes installation and designing topologies of firewall. In consideration of designing topologies I have configured firewall rules for client to server connections, client’s internet connection through firewall, connections between load balancer and servers etc.


Providing post-sale support (firewall, load balancer, IPS, VPN etc.) to customers of MSSP.

Design of new customer Security topologies with firewalls and load balancers and deploy these topologies into production.

Configuration of Web Application Firewall (WAF) on NetScaler load balancers regarding OWASP-10 vulnerabilities.

Implementing DRC scenarios with NetScaler GSLB configuration

Supply with access requests by configuring firewalls such as Checkpoint, Fortigate, Cisco ASA etc.

Personal achievements:

Customer Security Services Installations & Implementation:

-Design Firewall & Load balancer topologies, installations, implementation websites on load balancer.

-Design Hotspot configuration on fortigate.

NetScaler Web Application Firewall setups:

-Initial WAF setup & support.

NetScaler MAS Integration

-MAS integration with NetScaler.

-Web Insight / Security Insight analyzes via Appflow.

NetScaler Python Integration

-Python scripts implementations on NetScaler.

Customer Security Services Migration:

-Customer migration from another ISP environment to Vodafone site and administration of their security devices such as firewall, load balancer etc.

Enterprise and End-user Services Migration:

-Separation on load balancers regarding to type of services which might be enterprise or end-user customer services and migration those services/web sites to new load balancer environments.

DNS Load balancer Migration:

-Migration from end of life/support NetScaler hardware to new generation NetScaler pair which meets whole Vodafone fixed net end user customers’ DNS requests.

IT Security Specialist

Borsa Istanbul A.S

2013 – 2016, Istanbul, Turkey

Role details:

I worked as IT Security Specialist in Borsa Istanbul A.S. which is the only stock exchange firm in Turkey.

As an IT Security Specialist, I managed firewalls (Checkpoint, Cisco ASA, Fortigate etc.), load balancers (F5, NetScaler and Nginx), SSLVPN devices (Juniper, Cisco ASA) and other security devices such as Sourcefire IPS, Vasco, Websense, Tufin etc.

I was project manager of Load balancer Purchase and Implementation. It was migration job from Cisco CSS to F5. Every web sites had been running on Cisco CSS load balancer which was End of Sale and End of Support. I have set up F5 cluster and implemented those websites on F5. Also I configured F5 ASM policies for all websites such as, etc. ASM policies had both Web Application Firewall and DDoS Protection configuration.


Firewall configuration based on basic security approaches (rule management, network

configuration etc.), full setup

Detailed load balancer configurations regarding to institutional security policy

Checkpoint, Cisco ASA, Juniper IPsec VPN-SSL VPN configurations

Analyzing of IPS, DDoS and anti-virus devices’ reports

Trouble shooting of all security devices such as Firewall, load balancer, SSLVPN, IPS etc

Personal achievements:

Load balancer purchase & setup:

-Proof of Concept (POC), preparing technical report and specification

-Installation of F5 ADC after purchase

-Configuration of load balance, cache, compression (LTM & AAM)

-Configuration/Support WAF and GET DDoS protection (ASM) of whole websites on F5 such as,, etc.

Datacenter Mobilization:

-All security devices like firewall, IPS, load balancer etc. have been moved without interruption of production systems from former datacenter to new datacenter according to weekly plan

NetScaler Load Balancer Specialist

Exclusive Network Turkey (Bilisimcim A.S.)

2011 – 2013, Istanbul, Turkey

Role details:

I worked as a NetScaler Specialist in Exclusive Network which is a distributor of NetScaler in Turkey. I worked as post-sales and presales engineer at the same time.

As a post-sales engineer, my job definition was providing post-sales support on load balancer modules such as load balancing, content switching, web application firewall, geographic load balancing (GSLB), caching & compression, authentication & authorization, access gateway (SSL VPN module) etc. Also maintenance & operations such as initial setup, upgrade, new configurations etc. was in my job scale.

As a presales engineer, I made POCs (proof of concept) to potential customers about the NetScaler modules mentioned above and also gave training to the customers about these modules.


Load balancing, Application Firewall, Cache/Compression, Policy Based Security, Authentication etc.)

Preparing technical specification

Installation and startup process

Post-sales and Presales support

Personal achievements:

Made POC and initial setup for customers below.

Customers: Turk Telekom, Vodafone, Morhipo, Sahibinden, Brodage, Yapı Kredi Sigorta, Kuveytturk, Akbank, Hürriyet, Zaman, Dogan Holding, Takasbank, Aviva Sigorta, etc.

Given post-sales support for customers below.

Customers: Turk Telekom, Vodafone, Yapı Kredi, Garanti, Akbank, Kuveytturk, Sahibinden, Morhipo, İBB, Zaman, Hürriyet, Dogan Holding, Yemeksepeti, ÖSYM etc.


Citrix Certified Associate – Networking (CCA - N), 2019

Cisco Certified Network Associate Security (CCNA Sec), 2018

Cisco Certified Network Associate (CCNA), 2018

Check Point Certified Security Expert (CCSE), 2017

Check Point Certified Security Administrator (CCSA), 2015

Citrix Certified Administrator for Citrix NetScaler (CCA), 2012


Technical Courses

Citrix Netscaler Advanced Topics – Security, Management and Optimization (2019);

Checkpoint R80.10 Management (2018)

VMware NSX: Install, Configure, Manage [V6.2] (2017);

Citrix Netscaler Advanced Topics – Security, Management and Optimization(2017);

F5 Load balancer ASM (2015);

F5 Load balancer LTM (2015);

Cisco ASA Firewall SSL VPN (2014);

Juniper UAC (User Access Control) (2014);

Checkpoint Security Administrator (2013);

Citrix – NetScaler Administrator (2012);


Coursera Courses

Programming for Everybody – Python, University of Michigan (2017)


Istanbul Technical University

2006 – 2011

Bachelor’s degree in Control Engineering, faculty of Electricity and Electronics


Turkish – Native

English – Upper Intermediated

Contact this candidate