Application Security Engineer

CCBill is an online payment services provider used by more than 30,000 websites globally that supports the needs of both new and established businesses in the e-commerce and online space.

We are seeking an Application Security Engineer to support the secure development of internally developed applications. The successful candidate will perform application security testing, code reviews, threat modelling and vulnerability assessments while supporting the integration of security controls into the software development lifecycle.

The role will work closely with the development, architecture and Information Security team to identify and remediate security risks and improve the overall security posture of applications.

Location: Serbia

Working Hours: Monday to Friday (40 hours); 1PM-9PM CET, fully remote

Application Security Testing:

• Perform manual and automated security assessments of web applications and APIs.
• Conduct application penetration testing to identify vulnerabilities, security weaknesses and configuration issues.
• Document findings, remediation recommendations and risk ratings in clear technical reports.
• Validate remediation activities through re-testing
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Secure Development:

• Participate in threat modelling exercises and security design reviews.
• Perform security-focused source code reviews of internally developed applications.
• Support developers in understanding and remediating identified vulnerabilities.
• Promote secure coding practices and security awareness across development teams.

DevSecOps and Security Automation

• Support the implementation and operation of security testing within CI/CD pipelines.
• Assist with the deployment and tuning of:
  • Static Application Security Testing (SAST)
  • Dynamic Application Security Testing (DAST)
  • Software Composition Analysis (SCA)
  • Secrets detection controls
  • Contribute to security automation initiatives using Jenkins, GitLab and Bitbucket.

Vulnerability Management

• Track and manage vulnerabilities identified during security testing activities.
• Work with development teams to prioritise and remediate findings.
• Assist in assessing application security risks and recommending appropriate mitigation measures.

Collaboration

• Work closely with development, architecture, infrastructure, and Information Security teams to improve application security.
• Support security reviews prior to production deployments.
• Contribute to the continuous improvement of application security standards, processes and procedures

• Minimum 3 years of experience in application security, penetration testing, software development or a related information security role.
• Experience performing web application security assessments and penetration testing.
• Understanding of secure software development practices.
• Experience reviewing source code and identifying common security vulnerabilities.
• Strong knowledge of:
  • OWASP Top 10
  • CWE
  • NIST security guidance
  • Secure coding principles

• Knowledge of web technologies, APIs, databases and networking concepts.
• Familiarity with programming languages such as:
  • Java
  • .NET/C#
  • Python
  • JavaScript
  • Perl
• Understanding authentication, authorisation and session management concepts.

• Experience with some of the following:
  • Burp Suite
  • OWASP ZAP
  • Nessus
  • Metasploit
  • Wireshark
  • SAST and DAST tools

CI/CD and DevSecOps

• Exposure to:
  • Jenkins
  • GitLab
  • Bitbucket
  • Agile development environments

• Strong analytical and problem-solving skills.
  • Effective verbal and written communication skills.
  • Ability to work collaboratively within cross-functional teams.
  • Willingness to learn and develop expertise in application security and DevSecOps practices.
• Proactive, strategic thinker who can turn concepts into actionable plans.
• Advocates security improvement initiatives while understanding business priorities and constraints.
• Demonstrated experience in mentoring, coaching, and supporting the growth of a diverse and distributed team.