Find Linux system Jobs in Dublin, D

Penetration Tester
Integrity360 —Dublin, County Dublin
- Azure
- Computer Science
- English
Application Security Engineer
Elwood Roberts —Dublin, County Dublin
- €70,000–€77,000 a month
- Full-time
- Linux
Quick apply
Quantitative Development - DevOps Engineer
Millennium Management —Dublin, County Dublin
- DevOps
- Research
- Linux
Infrastructure Engineer (Core)
Telnyx —Dublin, County Dublin
- Remote
- Computer networking
- Software development
- Linux
Quick apply
IT Systems Engineer
Daon Inc —Dublin, County Dublin
- Full-time
- Hybrid work
- Computer Science
- Windows
- Bachelor's degree
Quick apply
Privileged Access Management Engineer
American International Group UK Limited, Ireland Branch & AIG Europe S.A. (Ireland Branch) —DUBLIN 1, County Dublin
- Full-time
- Azure
- Oracle
- Windows
Quick apply
11d
Site Reliability Engineer, Edge Systems
Protex AI —Dublin, County Dublin
- Full-time
- Hybrid work
- Computer Science
- AWS
- Analysis skills
14d
Systems Engineer (Full Remote)
EXOGROUP —DUBLIN 18, County Dublin
- Full-time
- Spanish
- Computer Science
- English
- Relocation assistance
- Annual leave
Quick apply
kdb+ Engineer
Data Intellect —Dublin, County Dublin
- Full-time
- Hybrid work
- Azure
- AWS
- Software development
- Referral programme
Quick apply
10d
Lifecycle Governance & Controls Services Analyst
Bank of America —Dublin, County Dublin
- Full-time
- Windows
- Analysis skills
- Presentation skills
- Employee assistance program
10d
Network Service Engineer
Digital Realty —Dublin, County Dublin
- Full-time
- Azure
- AWS
- No degree
IT Systems Administrator – Contract (Dublin, Ireland)
Hadfield Green —DUBLIN 2, County Dublin
- Windows
- Linux
- Communication skills
Cloud Engineer
Mars Capital —Dublin, County Dublin
- Full-time
- Hybrid work
- Azure
- DevOps
- Windows
Quick apply
Technical Solutions Engineer, Databases (English)
Google —Dublin, County Dublin
- €84,000–€86,500 a year
- Full-time
- Sales
- Engineering
- English
Database Software Engineer
eBay Inc. —Dublin, County Dublin
- Full-time
- Oracle
- Computer Science
- Java
1d
Full Stack Developer
Inflight Dublin —Dublin, County Dublin
- Full-time
- Master's degree
- SQL
- AWS
Quick apply
Software Systems Engineer
Meta —Dublin, County Dublin
- C++
- Linux
- Manufacturing
3d
Lead Cloud Engineer
Elwood Roberts —Dublin, County Dublin
- €400–€450 a day
- Full-time
- DevOps
- AWS
- Agile
Quick apply
Senior Infrastructure Platform Engineer
BWG Foods —DUBLIN 24, County Dublin
- Full-time
- Hybrid work
- Azure
- Computer Science
- Windows
Quick apply
12h
Senior CloudOps Engineer
Learnosity —Dublin, County Dublin
- Full-time
- Hybrid work
- AWS
- Scripting
- Linux
- Annual leave
- Employee assistance program
Quick apply
10d

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Penetration Tester

Integrity360 -
Dublin, County Dublin

Apply Now

Job details

Qualifications

Azure
Computer Science
Financial auditing
Visual Basic
C#
UNIX
English
Windows
.NET
Information security
Java
Bash (Unix shell)
Firewall
AWS
C++
Presentation skills
C
Scripting
Burp Suite
Ruby
Telecommunication
Linux
ASP
Communication skills
Python
PowerShell
Active Directory
Network security
VPN

Full job description

About Us

Integrity360 is a leading independent cybersecurity and PCI specialist operating across Europe, Africa, the Caribbean, and North America. The company has office locations in Ireland, the UK, Bulgaria, Italy, Sweden, Spain, Lithuania, Ukraine, Africa, the Caribbean, and Canada, supported by six Security Operations Centres (SOCs) located in Dublin, Sofia, Madrid, Stockholm, Rome, and Cape Town.

With over 780 employees, including more than 585 dedicated cybersecurity professionals, Integrity360 delivers a full suite of professional, support, and managed security services. These span the complete cyber risk lifecycle, from identification and prevention to detection, response, and recovery. Integrity360 supports over 3000 mid-market and enterprise organisations across sectors including financial services, insurance, government, healthcare, retail, telecommunications, and utilities.

At Integrity360, people come first. We invest heavily in learning, development and progression, fostering a dynamic culture where innovation, collaboration and continuous growth are at the heart of what we do. If you're ready to take your cyber security career to the next level, we’d love to hear from you.

Role Overview

As a Penetration Tester, you will perform hands-on technical security testing across a range of environments and technologies, working on complex and high-value projects. You will be expected to perform advanced manual testing (not just automated scans), exploit vulnerabilities, and deliver clear, actionable reports to clients.

This role is ideal for someone who already has solid penetration testing experience and wants to take their technical skills to the next level, while also contributing to research and innovation within the team.

What You Already Bring

2+ year of practical penetration testing experience (in labs, personal projects, or professionally)
Strong understanding of core security concepts (e.g., OWASP Top 10, CVSS, MITRE ATT&CK)
Solid grasp of networking fundamentals, ports/protocols, basic Windows/Linux internals
Experience with common tools: Nmap, Burp Suite, Gobuster, Metasploit, BloodHound, etc.
Manual testing exposure — not just automated scans
Basic scripting or coding (e.g., Python, Bash, PowerShell)

Nice to Have (But Not Required)

Practical experience in one or more of:
Active Directory attacks
Cloud (AWS/Azure) testing basics
Social engineering
Source code review
Certifications such as OSCP or similar

What We Offer

A clear career path from Associate Mid-Level Senior

Red Team
Support for certifications, lab access, and personal development
Internal mentoring and hands-on training
Exposure to real client projects and cutting-edge engagements

Key Responsibilities

Conduct penetration tests and technical security assessments on:
- Web applications and APIs
- Mobile applications
- Network infrastructure (internal and external)
- Cloud and hybrid environments
- Social engineering scenarios (as needed)
- Consultancy
- Other offensive security services
Review system architecture and application designs for security weaknesses.
Exploit and escalate vulnerabilities to demonstrate real-world risk.
Document technical findings and produce high-quality reports with remediation guidance.
Stay current with the latest attack techniques, vulnerabilities, and tools.
Participate in internal knowledge sharing, tool development, and security research.
Support sales activities with technical insights when needed (e.g., scoping calls, workshops).

Required Skills / Experience

Hands-on experience as a penetration tester, with a proven track record of delivering quality security assessments.
Industry experience working in Dev/Admin/Engineer field
Industry experience working in the Information security field as a penetration tester
Development and/or source code review experience in C/C++, C#, VB.NET, ASP, PHP, Java, Python or Ruby
Unix, Windows and networking security skills
Familiarity with general application and network security concepts
Excellent communication skills
Manual penetration testing experience above and beyond running automated tools
Networking knowledge (ports, protocols, firewalls, routing, VPN)
Understanding of Security Auditing tools
Ethical hacking experience
Report writing experience
Presentation skills
Scripting/coding, sys admin or networking experience

Personal Specification

Urgent desire to learn with a passion for technology
Motivated by being at the forefront of technology, and pushing technology boundaries
Motivated by the thrill of being able to “break” systems
Willingness to work late when required
Willingness to travel when required, possibly abroad
Analytical and critical thinker
Good written English skills

Problem-solving skills
Efficient
Analytical
Persistence

Certifications/Qualifications

One of the industry-leading qualifications (OSCP, CyberScheme, CREST, OSCE, OSWP)

#LI-PM2

Apply Now

Refine Your Search

linux system jobs in dublin, d

Penetration Tester

Application Security Engineer

Quantitative Development - DevOps Engineer

Infrastructure Engineer (Core)

IT Systems Engineer

Privileged Access Management Engineer

Site Reliability Engineer, Edge Systems

Systems Engineer (Full Remote)

kdb+ Engineer

Lifecycle Governance & Controls Services Analyst

Network Service Engineer

IT Systems Administrator – Contract (Dublin, Ireland)

Cloud Engineer

Technical Solutions Engineer, Databases (English)

Database Software Engineer

Full Stack Developer

Software Systems Engineer

Lead Cloud Engineer

Senior Infrastructure Platform Engineer

Senior CloudOps Engineer

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