Roman Opritz

Senior Site Reliability Engineer @ Freelance / Contract / Self-Employed

About

Senior Site Reliability Engineer with 20+ years in AWS, GCP, and hybrid systems. Expert in Kubernetes, CI/CD, observability, and IaC, delivering secure, scalable infrastructure for global platforms like Microsoft/Skype and HolidayCheck. I design and operate reliable cloud-native platforms, automate infrastructure lifecycles, and optimize developer workflows through Git-based change management. My experience spans multi-cluster Kubernetes, CI/CD pipelines, observability stacks, and resilient data platforms. I’ve driven migrations from legacy to cloud-native architectures and strengthened on-call operations to improve resilience. I thrive in remote-first, globally distributed teams, embracing async collaboration and diversity to build solutions that scale.

Country

Germany

City

Brannenburg

Industry

Information Technology & Services

Skill

K8s, SMTP, Hypertext Transfer Protocol Secure (HTTPS), RDBMS, Routing, Packet filtering, Xen, Nginx, Wowza Media Server, Gerrit, GNU Make, Kamailio, Freeswitch, SSH, Debian, Tcpdump, Cacti, Lxc, Hyper-V, Ubuntu

Experience

Senior Site Reliability Engineer

Freelance / Contract / Self-Employed

2024-3 - Present · 2 yrs 7 mos

• Supported Kafka migration to AWS MSK for Virtual Minds’ Media Manager, enabling real-time processing of up to 100K events/second for TV ad campaigns. • Used Terraform IaC and Prometheus/Grafana to enhance observability within Kubernetes. • Automated deployments for cloud-native workloads using GitLab CI and ArgoCD, ensuring secure, reproducible infrastructure for programmatic advertising platforms.

Senior System Engineer

ryd

2020-12 - 2024-2 · 3 yrs 3 mos

Greater Munich Metropolitan Area

• Designed and managed cloud infrastructure (Gridscale, Kubernetes). • Managed networking and IPsec tunnels to POS terminals of gas stations. • Implemented CI/CD pipelines with GitLab and automated deployments. • Led incident management and platform observability efforts, including performance tuning and evaluating distributed tracing solutions.

Senior Platform Engineer / DevOps

HolidayCheck AG

2017-4 - 2020-5 · 3 yrs 2 mos

Munich Area, Germany

• Built and maintained immutable cloud infrastructure (GCP). • Automated Elasticsearch clusters deployment, management and upgrades. • Designed CI/CD pipelines and optimized service deployments. • Enhanced monitoring, automation, and incident response. • Developed a PagerDuty API integration with Telephony provider system.

Senior System Administration / DevOps Engineer

JUNIQE

2016-7 - 2016-11 · 5 mos

Berlin Area, Germany

• Developed and maintained AWS cloud infrastructure and CI/CD pipelines. • Managed Infrastructure as Code (Terraform, Ansible). • Automated virtual environments spin-up for every new feature branch in Git. • Improved monitoring with Grafana and Prometheus.

Expert Service Engineer 2

Microsoft

2013-8 - 2015-12 · 2 yrs 5 mos

Estonia

• Managed global Skype infrastructure (service nodes) hosted in data centers • Conducted server configuration and maintenance, security updates and OS upgrades, deployment & rollback of new releases • Collected performance data for capacity planning and optimization. • Supported transitioning from P2P to centralized microservices architecture • Drove migration of services across data centers and into the Azure cloud • Improved monitoring by adding new graphs and fine-tuning alerts (Cacti, Nagios) • Extended automation with scripts, Ansible and Puppet configuration • Developed documentation and troubleshooting guides for NOC • Participated in on-call rotation, incident management and post-mortems.

Senior Linux Administrator

Kwebbl

2013-3 - 2013-7 · 5 mos

Kiev

• Designed and implemented infrastructure for cloud-based telephony services. • Researched and integrated VOIP solutions (Kamailio, FreeSWITCH). • Installed, configured, and optimized VOIP platforms and networking.

Build & Release Engineer

Texas Instruments

2012-8 - 2013-1 · 6 mos

Kiev

• Maintained build and release procedures for Android OS development. • Automated daily sanity tests and performance tracking. • Developed reporting tools for open-source contributions.

Systems Engineer

Bash Console Limited

2008-9 - 2012-12 · 4 yrs 4 mos

Kiev, Ukraine

• Built and maintained IT infrastructure for web and cloud applications. • Administered remote Linux servers and high-availability clusters. • Set up LAMP environments, optimized databases, and improved CMS performance.

Linux Systems Administrator, Developer

Media Network Inc.

2007-6 - 2011-12 · 4 yrs 7 mos

- Remote Linux servers administration and maintenance - IP routing, tunneling and DNS management - Real-time system/network monitoring and troubleshooting - Dealing with Help Desk, ISPs and Data Centers - Managing HA web clusters, load balancers, databases and virtual environments - Working in touch with development team - Task automation and scripting - Development with PHP/MySQL/Oracle Used technologies: TCP/IP, DNS, SMTP, HTTP, RDBMS, Routing, Packet filtering, Xen, Subversion, GNU Make, Unix shell, PHP, MySQL, Oracle, HA-proxy, Apache, NGINX, Memcached

Linux Systems administrator

Adjustables B.V.

2008-4 - 2008-12 · 9 mos

Kiev, Ukraine

- Remote Linux servers administration - Data storage and Database management - Setup and configuration of web servers, load balancers, virtual environments and other services for Development Team and Production - Automated product deployment using GNU Make and set of scripts Used technologies: TCP/IP, DNS, SMTP, HTTP, RDBMS, Routing, Packet filtering, Xen virtualization, Jira, Confluence, Subversion, GNU Make, Unix shell