Senior Linux System Administrator

Contis Technologies Pvt Ltd; Gujarat; On-site; INR 1,000,000 - 1,500,000; Full time

Job summary

A global fintech firm in India seeks a Senior IT Infrastructure professional to manage and secure a large-scale Linux environment. You will oversee around 400 virtual machines and ensure optimal performance for critical systems. Responsibilities include establishing high availability, automating deployments using tools like Ansible, and collaborating with cross-functional teams to uphold service continuity. The ideal candidate has extensive experience with virtualization platforms, proficient automation skills, and strong troubleshooting capabilities.

Qualifications

• Minimum 4 years of experience in Linux system administration with large server environments.
• Proven experience managing virtualization platforms and virtual machines.
• Ability to write automation scripts in multiple languages including Bash/Python/Go.

Responsibilities

• Manage and maintain approximately 400 Ubuntu/Debian-based virtual machines.
• Support and optimize database systems in production environments.
• Monitor infrastructure health and troubleshoot incidents as they arise.

Skills

Linux system administration

VMware ESXi

MariaDB

Ansible

Python

Kubernetes

GitLab CI

Tools

Zabbix

Prometheus

Terraform

InfluxDB

Docker

RabbitMQ

PostgreSQL

Job description

Contis is part of Paysera group. 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.

About the Role

• 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.

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 between old and new data centers with zero critical service downtime.
• Document system configurations, SOPs (Standard Operating Procedures), and change logs for audit readiness.
• Collaborate with cross-functional teams to align infrastructure changes with business continuity plans.

Qualifications

• Minimum 4 years of Linux system administration in production environments with 100+ servers.
• Proven experience with virtualization platforms (VMware ESXi/Proxmox/KVM) managing 100+ VMs concurrently.
• Proficiency in administering DBs MariaDB/PostgreSQL and Redis.
• Ability to write and maintain automation scripts in Bash/Python/Go, and use Terraform & Ansible for infrastructure-as-code.
• Solid knowledge of the OSI model and experience with ACLs, VPNs, and firewalls at a junior-to-mid level.
• Demonstrated experience with infrastructure monitoring tools (Zabbix, Prometheus or InfluxDB) for environments with 99.9%+ uptime targets.
• English language skills at B2 level or higher for technical documentation and cross-team communication.
• Stable career history with average tenure of 2+ years per role over the past 5 years.

Required Skills

• Experience deploying and managing Kubernetes clusters and Docker containers.
• CI/CD pipeline management experience using GitLab CI.
• Administration experience with cloud platforms (AWS, GCP).
• Experience configuring and managing CDN services such as CloudFlare or Akamai.
• Production experience with RabbitMQ and Kafka.