Application Security Engineer

Claranet limited; Lisboa; On-site; EUR 50,000 - 75,000; Full time

Job summary

Claranet limited in Lisbon is seeking an Application Security Engineer to join our internal team on site. You will support security assessments for new applications, review architectures and data flows, and identify vulnerabilities with mitigations throughout the lifecycle.

The role requires hands-on threat modelling, strong documentation, and experience integrating security tooling. Collaboration with development teams and audits is essential.

Qualifications

• 3–5 years of cybersecurity experience with proven application security expertise.
• Knowledge of ISO 27001 and OWASP Top 10.
• Hands-on threat modelling (STRIDE, LINDDUN or equivalent).
• Strong documentation and communication skills.

Responsibilities

• Supporting application security assessments for new applications and major changes.
• Analysing security requirements and reviewing architectures, data flows, interfaces and dependencies.
• Identifying vulnerabilities and recommending mitigations.
• Running Threat Modelling and embedding Security by Design across the project lifecycle.
• Validating implemented controls and issuing security recommendations to support go/no-go decisions.
• Producing clear technical reports and tracking findings until they are closed.
• Supporting the integration of AppSec tooling (SAST, DAST, SCA, IAST).
• Reporting on risk and maturity indicators, and supporting audits.

Skills

Application security

Threat modelling

Documentation

Communication

Education

Degree in Cybersecurity

Related field (CS/CE)

Tools

SAST

DAST

SCA

IAST

Job description

We're fast learners, hard workers, natural collaborators... and we Make Modern Happen!

Our ambition is to unlock the potential of our digital world so that organisations everywhere can innovate and thrive securely.

We aim to achieve this goal by bringing together the world’s most talented people and the most powerful technologies, combining them to address our customers' challenges and to build something stronger together.

Right now, we are looking for a Application Security Engineer to integrate our internal team, based in Lisbon.

Your responsibilities include:

• Supporting application security assessments for new applications and major changes
  


• Analysing security requirements and reviewing architectures, data flows, interfaces and dependencies
  


• Identifying vulnerabilities and recommending mitigations
  


• Running Threat Modelling and embedding Security by Design across the project lifecycle
  


• Validating implemented controls and issuing security recommendations to support go/no-go decisions
  


• Producing clear technical reports and tracking findings until they are closed
  


• Supporting the integration of AppSec tooling (SAST, DAST, SCA, IAST)
  


• Reporting on risk and maturity indicators, and supporting audits
  

You must have:

• A degree in Cybersecurity, Computer Science, Computer Engineering or a related field.
  


• 3 to 5 years of experience in cybersecurity, with proven experience in application security (Web, Mobile, APIs, Cloud)
  


• Knowledge of ISO 27001 and OWASP Top 10
  


• Hands-on experience with Threat Modelling (STRIDE, LINDDUN or equivalent)
  


• Strong documentation and communication skills
  

We value:

• Experience in large corporate or industrial environments
  


• Familiarity with Secure SDLC and corporate security governance
  


• Experience integrating security tools into delivery pipelines
  


• A pragmatic, collaborative approach to working with development teams