JatApp is an IT product company that creates valuable high-tech products used daily by millions worldwide. We are looking for a Linux System Administrator for the company’s largest product - a cross-platform VPN service . Our product helps at least 10 million users around the world to meet their needs in cyber protection. Our goal is to enter the top 5 best VPN services in the world. Tasks Install, configure, and maintain Linux servers (Debian/Ubuntu) across a large-scale environment. You'll be responsible for managing server performance, monitoring uptime, optimizing speed, and analyzing traffic Monitor the quality of services, proactively identify potential issues, and implement solutions to ensure seamless operation Respond to and resolve server and service incidents effectively. Provide technical support to clients and internal teams, assisting them with any Linux-related challenges Communicate with hosting providers, address service violations and abuse issues, and negotiate with partners to expand our server capacity Conduct regular audits of our infrastructure, manage payments and renewals, and maintain comprehensive documentation Requirements 2+ years of hands-on experience administering Linux (Debian/Ubuntu) in a large-scale environment, a strong understanding of commands, file systems, processes, and network configurations Experience with monitoring tools such as Nagios and Prometheus+Grafana to track server health and performance Understanding of TCP/IP networking and VPN protocols like WireGuard, OpenVPN, IPSec, and iperf for speed measurement and traffic optimization Proven ability to create and maintain technical documentation, conduct infrastructure audits, and communicate effectively with partners and hosting providers Excellent written communication skills, particularly in business correspondence At least an Intermediate level of English or higher Ability to analyze large datasets, identify potential issues, and troubleshoot effectively Proactive attitude, detail orientation, and strong analytical skills A collaborative team player who can effectively communicate technical information to both technical and non-technical colleagues Owner-Mindset: You take ownership of your work and demonstrate a responsible approach to server infrastructure management Will be a plus: Knowledge of HTTP/HTTP2/DNS protocols Experience with HAProxy JatApp ​​is an IT product company that creates valuable high-tech products used daily by millions worldwide.