Application Security Architect (F5)

Our client is a leading telecommunication services provider with a strong presence in the Bulgarian market. The company has over 20 years of presence in the Bulgarian market as one of the first mobile operators with high standards in the care of its employees and customers. As a result of their strategic expansion, our client is looking for an “Application Security Architect” to join their “Cybersecurity” team. They are looking for a senior specialist who will be responsible for the design and configuration of F5 network security solutions on the clients side, leading various projects, analysing the clients' infrastructure and subsequently implementing and configuring the products and services they deliver.

In addition to competitive pay and a rich package of benefits, the company offers great development opportunities. The position is for the city of Sofia, allowing a hybrid model of work (from the office and home). Please see more information below:

Application Security Architect (F5)


- Build, test, deploy, analyze, administer, and maintain enterprise F5 Platforms with a focus on Reverse Proxy, Authentication, Monitoring & Protection (RAMP) services.
- Configure and maintain the F5 ASM/AWAF and LTM modules.
- Develop, maintain and optimize customized F5 iRules and scripts.
- Assist application developers and enforce secure coding best practices.
- Design, deliver and support the integration layer between operating systems and business applications.
- Provide technical testing of significant maintenance, operational, upgrade activities and process enhancements/updates.
- Automating configuration and implementation activities.
- Integration of web application in the Web Infrastructure for client’s infrastructures.
- Establish and document installations, guidelines, policies and procedures for relevant stakeholders.
- Set and enforce compatibility and interoperability standards that ensure site accessibility for all users.
- Monitor and report on Web site traffic and performance.
- Perform pre-sales/consultancy meetings with clients.


- University degree in Telecommunications, Cyber Security or another relevant field
- At least 3 years of working experience in implementing network security solitons.
- HTTP Protocol mastery.
- Experience with F5 BIG-IP architecture.
- Experience with Web Application Firewall (WAF) solutions preferably F5 ASM/AWAF.
- Knowledge with iRules logic.
- Knowledge with WAF Solution Design is required.
- Web Application knowledge:
- OWASP top 10 (XSS, CSRF, SQL Injection, RFI, LFI, etc.)
- HTTP request parts (URL, URI, parameters, headers, body)
- HTML DOM parts (head, body, script tags)
- Web Application components (front-end/back-end)
- Penetration testing experience is highly appreciated, but not mandatory.
- Fluency in the English language.

Should you consider yourself as the right candidate for this role, we would be glad to receive your CV in English.

Only shortlisted candidates will be contacted by our consultants.

Applying for this position, you are authorizing Novi Global to work and process with your personal information following the Law for Personal Data Protection.

Agency license Number 2123 issued on 04.10.2016.
Job Type:
Job Title:
Application Security Architect (F5)
Bulgaria - Sofia

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