Nemanja Jeremić

Contact

Email: nemanja@joker.rs
Mobile: +381 61 2344405
Website: nemanja.jeremic.cv
LinkedIn: linkedin.com/in/nemanja-jeremic
Driver's License: Category B

Languages

Serbian: Native
English: Professional working proficiency

Professional Profile

Infrastructure engineer and team lead focused on production Linux systems, virtualization, automation, and internal tooling. Hands-on experience leading hosting operations, maintaining production authoritative DNS infrastructure based on BIND and PowerDNS, including DNSSEC-enabled services, resolving complex production issues, and building internal tools and automation that reduce manual work and improve operational efficiency.

Technical Skills

Linux Administration
(Ubuntu, AlmaLinux, CloudLinux)

DNS Infrastructure & DNSSEC
(BIND, PowerDNS, authoritative DNS operations)

Hosting Platforms
(cPanel/WHM, Apache, LiteSpeed)

Virtualization
(Proxmox, VMware ESXi / vSphere)

Databases
(MySQL, MariaDB, PostgreSQL)

Programming and Scripting
(PHP, Bash)

AI & Automation
(OpenAI API, MCP integrations, Codex CLI, Claude Code, OpenCode, multi-model workflows)

Caching and Performance
(Redis, Varnish)

Monitoring
(Nagios)

Version Control
(Git)

Selected Projects

OpsCheck opscheck.tech

Public toolkit with 25+ practical tools for DNS, SSL/TLS, email security, and network diagnostics, built for fast day-to-day infrastructure troubleshooting.

Work Experience

System Administrator / Team Leader – Hosting Department

Orion Telekom · Full-time

Dec 2021 – Present · Belgrade, Serbia · Hybrid

Leading the hosting team and planning infrastructure and operational activities.
Independently designed and developed an internal platform that replaced manual hypervisor searches with centralized resource discovery across multiple virtualization environments and automated key operational workflows, saving an estimated 500+ staff hours annually.
Administering and maintaining hosting environments, virtual servers, and hypervisor infrastructure.
Responsible for operating and troubleshooting production authoritative DNS infrastructure based on BIND and PowerDNS.
Resolving complex production issues and providing high-level technical support.
Technologies: BIND, PowerDNS, cPanel/WHM, Proxmox, Proxmox Backup Server, MySQL, Apache, Ubuntu, AlmaLinux, Nagios, Exim.

Developer – Software Distribution & Endpoint Security

NCR Corporation · Full-time

Oct 2019 – Dec 2021 · 2 yrs 3 mos · Belgrade, Serbia

Worked on software distribution and package testing for ATM devices within the Global Software Distribution & Endpoint Security team.
Handled Microsoft Security updates, APTRA Edge upgrades, and deployment processes for client environments.
Supported environments covering around 30 banks in the United States and approximately 1,500 endpoints.
Performed log analysis, issue identification, and troubleshooting in distributed systems.
Technologies: Batch, PowerShell, C# .NET, MS SQL, SCCM/GCSM, CA/EPM, AXEDA, GASPER, GEMS/GMSS, Microsoft SharePoint.