Application & AI Security Engineer

Ad. Tech Holding is an Innovation hub based in Cyprus, which creates vibrant startup ecosystems and technologies for Ad. Tech & Mar. Tech projects. Since 2011, Ad. Tech Holding has been a starting point for an array of industry-leading advertising and digital marketing companies (Propeller. Ads, Zeydoo etc). Holding brings the most daring ideas to the market and creates cutting-edge solutions to deliver technology globally.

We are looking for an Application and AI Security Engineer for our Security Department!

Responsibilities

Run security reviews of services, integrations and public APIs before they go to production, including manual review of critical code. Do threat modeling for new features with product teams at the design stage. Own security checks in the development lifecycle (static analysis, dependency scanning, secret detection), covering coverage, rules and triage of findings with teams.

Build a unified vulnerability management process, including the vulnerability register, prioritization, SLAs, retesting and bug bounty. Secure AI integrations and define access policies for service and AI agent accounts. Run penetration tests and audits: scope them, accept the results and follow findings through to systemic fixes.

Develop and maintain standards and practices for developers, including secure development requirements, guidelines and team training.

Requirements

3+ years of experience in application security, covering code and architecture reviews, SAST, DAST, SCA and OWASP. Strong manual testing skills and hands-on experience with static analysis, including writing your own custom rules. A solid understanding of how authorization works in practice: OAuth, OIDC, JWT, token scopes and delegated permissions.

Ability to read PHP, Go and JavaScript code and to automate tasks in Python or Bash. Ability to drive results with teams you don’t manage directly, including through security champions. Interest in LLM application security, such as prompt injection and AI agents’ access to data. Working proficiency in Russian and English.

What you should know Manual testing with Burp Suite or ZAP Static analysis Dependency scanning Secret detection in code Vulnerability management OWASP Top 10 OWASP API Security Top 10 OWASP Top 10 for LLM Applications ASVS Our stack: Languages: PHP (Symfony), Go, JavaScript/TypeScript, Python Data: PostgreSQL, MySQL, ClickHouse CI/CD: Docker, GitLab/GitHub, TeamCity Security: Sonar.

Qube, Nessus OS: Linux Nice to have: Experience in Ad. Tech or other high-load environments Dev. Sec. Ops experience Experience testing LLM applications Bug bounty or CTF experience OSWE or GWEB certification We offer freedom of choice: with us, you'd have a cafeteria benefits system where you can choose which benefits would fit your individual needs.

And, of course, a standard pack of benefits as well: health insurance, fully covered 10 working days of sick leave per year, 5 additional day-offs per year, English and other languages compensation, quarterly , and annual bonuses, corporate events, gifts, gym at the office, also food (yummy!) - you can find snacks in our worldwide working spaces and breakfasts & lunches in the offices!

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