About the Position

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:

Responsibilities

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

Requirements

Technical Skills

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.

Soft Skills

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

Languages

Fluency in Portuguese
English proficiency at B2 level or above.

We Offer

Hybrid work model
Opportunity to join an innovative organization that continuously invests in training its talents

About the Company

All our recruitment and selection processes are based on equal opportunities, valuing the competence and potential of each person and ensuring that no candidate is discriminated on the grounds of gender, ethnicity, sexual orientation, age, religion, or physical condition.

Job advertisement under Law nr 4 / 2019, of 10th January

Join us. Let's innovate together!

If you meet these conditions and would like to join an innovative organization that continuously invests in training its talents, send us your application.

Junior Security Engineer

Job description