Senior Linux System Administrator

About us

Paysera is the first fintech company in Lithuania and an EU-licensed e-money institution. We provide fast, convenient, and affordable financial services globally. Our services range from a payment gateway for e-shops, a finance management app, money transfers, and a parcel locker network. With over 1 million app downloads and growing, we aim to become an industry-leading super app that provides financial and lifestyle services across the globe. At Paysera, we are a start-up-minded team, which means we thrive in a fast-paced environment and seek open communication while placing great focus on upholding our core company values. Join our vibrant international team of over 700+ people across 20+ cities, worldwide.

Role Overview

Title : Linux System Administrator

Level : Senior

Team : IT Infrastructure (6 members)

Reports To : Head of IT Operations

Purpose : To manage, secure, and optimize Paysera's global Linux-based infrastructure, ensuring high availability, scalability, and security for all core business services across multiple data centers.

Key Responsibilities

R1 : Manage and maintain ~400 Ubuntu / Debian-based virtual machines in production using VMware ESXi, Proxmox, and KVM.

R2 : Support and optimize MariaDB, PostgreSQL, InfluxDB, Redis, and RabbitMQ in production environments of multi-terabyte scale.

R3 : Monitor infrastructure health using Zabbix, Prometheus, InfluxDB, and APM tools, ensuring SLA uptime compliance and incident resolution within defined response times.

R4 : Troubleshoot infrastructure-related incidents, escalating as needed, and perform planned maintenance with minimal downtime.

R5 : Automate deployments and configurations using Ansible, Terraform, and Helm for consistent and repeatable environments.

R6 : Implement and maintain operating system security hardening measures and integrate with SIEM solutions for proactive threat detection.

R7 : Participate in installing and configuring basic infrastructure services for a new data center.

R8 : Lead the migration of core business services between old and new data centers with zero critical service downtime.

R9 : Document system configurations, SOPs (Standard Operating Procedures), and change logs for audit readiness.

R10 : Collaborate with cross-functional teams to align infrastructure changes with business continuity plans.

Must-Have Requirements

Q1 : Minimum 4 years of Linux system administration in production environments with 100+ servers

Q2 : Proven experience with virtualization platforms (VMware ESXi / Proxmox / KVM) managing 100+ VMs concurrently.

Q3 : Proficiency in administering DBs MariaDB / PostgreSQL and Redis.

Q4 : Ability to write and maintain automation scripts in Bash / Python / Go, and use Terraform & Ansible for infrastructure-as-code.

Q5 : Solid knowledge of the OSI model and experience with ACLs, VPNs, and firewalls at a junior-to-mid level.

Q6 : Demonstrated experience with infrastructure monitoring tools (Zabbix, Prometheus or InfluxDB) for environments with 99.9%+ uptime targets.

Q7 : English language skills at B2 level or higher for technical documentation and cross-team communication.

Q8 : Stable career history with average tenure of 2+ years per role over the past 5 years.

Nice-to-Have Qualifications

N1 : Experience deploying and managing Kubernetes clusters and Docker containers.

N2 : CI / CD pipeline management experience using GitLab CI.

N3 : Administration experience with cloud platforms (AWS, GCP).

N4 : Experience configuring and managing CDN services such as CloudFlare or Akamai.

N5 : Production experience with RabbitMQ and Kafka

Work Conditions & Contract Info

W1 : Employment type : B2B contract or Direct Employment.

W2 : Location : Fully remote across the EU; hybrid (3–4 days / week in office) for Office-based candidates.

W3 : Core hours : 08 : 00–20 : 00 EEST (flexible scheduling within this window).

W4 : Contract length : 1+ years.

W5 : Compensation : €15–€25 / hour gross, depending on qualifications.

W6 : Optimal Start date : 2025-09-01.

W7 : Interview process : 1-2 stages.

What we offer

Work-life Balance : strive for balance with flexible working hours and full remote work possibilities.

Innovation and Development : participate in skill-building workshops and have freedom to experiment with various AI tools.

Growth-focused Culture : thrive within a highly professional, quality-oriented, and dynamic team and pursue your potential and innovative ideas in a fast-growing, international company.

For candidates

Only selected candidates will be contacted, but we are grateful to all who send their CV.

Location

Bulgaria, Georgia, IN (Ahmedabad), Lithuania, Poland, Ukraine

J-18808-Ljbffr