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 outstanding 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
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 centres.

Key Responsibilities




Manage and maintain ~400 Ubuntu/Debian-based virtual machines in production using VMware ESXi, Proxmox, and KVM.
Support and optimize MariaDB, PostgreSQL, InfluxDB, Redis, and RabbitMQ in production environments of multi-terabyte scale.
[Monitor infrastructure health using Zabbix, Prometheus, InfluxDB, and APM tools, ensuring SLA uptime compliance and incident resolution within defined response times.
Troubleshoot infrastructure-related incidents, escalating as needed, and perform planned maintenance with minimal downtime.
Automate deployments and configurations using Ansible, Terraform, and Helm for consistent and repeatable environments.
Implement and maintain operating system security hardening measures and integrate with SIEM solutions for proactive threat detection.
Participate in installing and configuring basic infrastructure services for a new data center.
Lead the migration of core business services betw

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