Linux Systems Engineer, Fintech

Location: Athens, Attica, Greece

Department: Technology & Innovation

Workplace: hybrid

Description

Optasia is a real-time financial intelligence company. We build precision intelligence that unlocks financial opportunity at scale, running millions of automated credit decisions every day across high-growth markets where formal credit data is limited. Our AI-powered platform turns permitted behavioural data and real-time signals into precise, responsible credit decisions. Embedded within the systems of telcos, banks, digital wallets and other partners, it helps them extend relevant financial services to more people while maintaining strong portfolio control and opens profitable new segments that were previously out of reach. This is how Optasia turns potential into financial progress, responsibly and at scale.

As member of the Systems Engineering team in Optasia, your primary objective is to ensure the stability, security, and smooth operation of all Linux-based systems by administering core platforms, supporting critical services, and maintaining consistent performance across production and staging environments.

What you will do

• Administer and maintain Linux systems (Red Hat and Debian) across production and staging environments.
• Perform regular patching, system updates, and security hardening.
• Manage and monitor system performance using Nagios, Grafana, and related tools.
• Support and maintain applications including Passbolt, DNS, FreeIPA, Radius, Jenkins, and Red Hat Satellite.
• Handle incident management, troubleshooting, and root cause analysis to ensure system reliability and uptime.
• Participate in operations & maintenance tasks and system improvement initiatives.
• Track and manage licenses, End of Support, and End of Life for Linux assets and software.
• Collaborate with cross-functional teams to support infrastructure and authentication services.
• Maintain accurate documentation for configurations, changes, and operational procedures.

What you will bring

• 3-5 years of hands-on experience as a Linux Systems Engineer or Administrator.
• Strong knowledge of Red Hat Enterprise Linux and Debian administration.
• Experience with FreeIPA, DNS, and Red Hat Satellite.
• Familiarity with Nagios, Grafana, and Radius.
• Solid understanding of system patching, incident management, and O&M processes.
• Scripting or automation skills (Bash, Python, Ansible).
• Good documentation, communication, and collaboration skills.

Why you should apply

What we offer:

• Work from anywhere policy (90-day per year)
• Competitive remuneration package
• Extra day off on your birthday
• Performance-based bonus scheme
• All the tech gear you need to work smart