Junior Security Engineer

• Fluency in Portuguese
• English proficiency at B2 level or above.

Noesis is looking for a Junior Security & Infrastructure Engineer to join our technical team (security engineering) to work in one of our offices (Lisbon, Porto, Coimbra, Guarda, Covilhã) with the following profile:

Security & Infrastructure Operations

• Support the operation, administration and troubleshooting of Windows and Linux systems and enterprise infrastructure
• Perform structured troubleshooting, root-cause analysis and support incident investigation and resolution
• Support security hardening, patching, vulnerability remediation and infrastructure security activities
• Execute technical changes following established procedures, change-management processes and documentation standards

Network & Security Technologies

• Basic understanding of networking and network security concepts, including DHCP, TCP/IP, DNS, HTTP/HTTPS and common network security protocols
• Basic knowledge or exposure to security technologies such as NDR, Email Security, EDR/XDR, firewalls, WAFs and Load Balancers
• Support the implementation, configuration and technical validation of security solutions, working alongside senior engineers
• Support basic troubleshooting and analysis of connectivity, security and application-related issues across different infrastructure layers

TLS, Cryptography & PKI

• Support TLS/SSL certificate lifecycle activities, including deployment, renewal, validation and troubleshooting
• Develop practical knowledge of PKI, Certificate Authorities, certificate chains and trust relationships
• Understand fundamental cryptographic concepts, including public/private keys, CSR and digital certificates
• Troubleshoot TLS/certificate-related connectivity and application issues

Technical Projects & Customer Engagement

• Participate in technical projects involving infrastructure and cybersecurity technologies, working alongside senior engineers and project teams
• Support technical meetings, requirements gathering and coordination with customers and internal stakeholders
• Track technical activities, issues, dependencies and deliverables, providing clear status updates and documentation
• Communicate technical issues and solutions clearly, progressively taking ownership of technical work packages and customer-facing activities

• Bachelor’s or Master’s degree in Computer Engineering or a similar field (preferred)
• 1–3 years of experience in the field
• Practical knowledge of Windows Server environments
• Practical knowledge of Linux systems
• Good understanding of fundamental networking concepts
• Basic understanding of cybersecurity principles
• Ability to perform structured technical troubleshooting and problem analysis
• Basic scripting or automation knowledge using PowerShell, Bash and/or Python is desirable.
• Strong problem-solving and analytical skills
• Structured and methodical approach to troubleshooting
• Ability to communicate with both technical and non-technical stakeholders
• Customer-oriented mindset
• Attention to detail, particularly when working with security-sensitive infrastructure
• Proactive attitude and willingness to investigate and learn independently