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Location
In office (Lisbon, Porto)
Seniority
Intern · 1+ year exp
Employment
Full-Time

Confirmed on the employer's own hiring board on Nov 5, 2026. First seen by Alion on Sep 29, 2026.

Overview
Company
Impact
Profile match
Celfocus is a Portuguese technology company founded in 2000 as a joint venture between Novabase and Vodafone. It builds operations and business support systems, digital channels and analytics for telecom operators. The company delivers projects for carriers across Europe, Africa and the Middle East.

Start your journey in a learning-driven environment, inside a fast-paced and ever-evolving world of tech and innovation.

At Celfocus, you’ll work with diverse teams on real projects and see how ideas turn into real impact.

Hybrid ways of working, international projects, and the space to explore different paths as you grow.

Explore your way in.

The opportunity

As an Application Security Trainee, you will assist the security team in identifying, analyzing, and mitigating security vulnerabilities in software applications. Your responsibilities may include supporting secure code reviews, participating in penetration testing, researching common threats, and helping implement security best practices across the development lifecycle.

Your day-to-day

  • Conducting analysis and threat modeling for new and existing Celfocus products/projects.

  • Analyzing and discussing requirements; interacting with all participants in the software development process.

  • Penetration testing web applications.

  • Conducting both manual and automated testing.

  • Participating in the creation and development of the company's products at all stages of their life cycle

What you’ll bring

  • Less than 1 year of effective experience in IT - This is a Celfocus Academy Opportunity

  • Eagerness to learn

  • A lively and flexible mind, clear logic, a detail-oriented approach.

  • Knowledge of HTTP.

  • Working knowledge of programming languages
  • Knowledge of the Top 10 OWASP vulnerabilities: how to find, exploit and fix them.
  • The desire and ability to work in a team.
  • The desire to develop yourself in the field of application security.Knowledge of English at least at the level of reading technical documentation.

Nice to have:

  • Good knowledge of Linux or Windows operating systems

  • Skills in scripting and automating your work using Powershell, Python, Bash, etc.

  • SAST (Sonarqube, Fortify, etc.

  • SCA (Dependency Check, Whitesource, etc)

  • DAST (ZAP, Burp, etc)

  • Defect Dojo

  • Java, PHP, Python, C, etc

  • Pipelines (Jenkins, Gitlab CI/CD, Azure DevOps, etc)

What’s in it for you

We are dedicated to fostering talent and nurturing the next generation of professionals. As part of our commitment to supporting junior team members, we offer a comprehensive training and mentoring program - Celfocus Academy - to help you excel in your career.

This is a personalized growth Program where you will be given a defined path and have a senior colleague dedicated to guiding you through every step of the way, being your counselor and your career advisor.

Your goals will be set and discussed to promote professional and personal growth through training and collaboration. Follow-up meetings happen three times a year, to assess your progress and adjust your goals.

The program includes

  • Full-Time Permanent Contract: Enjoy the stability and security of a full-time position with Celfocus.

  • Training and Mentoring Program: Benefit from our specialized training and mentoring initiatives designed specifically for junior team members. Our experienced professionals will guide you through hands-on learning experiences, ensuring you have the skills and knowledge to succeed.

  • Career Growth Opportunities: We believe in promoting from within. As you develop your skills and contribute to our team, you'll have the chance to advance your career within our organization.

  • Collaborative Work Environment: Join a supportive and collaborative team where your ideas are valued, and your contributions make a difference.

  • Work-Life Balance: We understand the importance of work-life balance. Enjoy a hybrid regime and flexible working hours.

To discover more about Celfocus Academy, please visit academy - Celfocus.

A place for everyone

At Celfocus, we are committed to cultivate a diverse and inclusive workplace. As an equal-opportunity employer, we welcome applicants of all backgrounds, gender identities, and abilities.

If you require any adjustments during the selection process, please inform our Talent Acquisition Team.

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