Site Reliability Engineer (Telco team)

It’s not every day that you consider starting a new career. We’re happy that someone as talented as you is considering this role. RingCentral is a $2 billion global leader in cloud-based communications and collaboration software. We are fundamentally changing the nature of human interaction—giving people the freedom to connect powerfully and personally from anywhere, at any time, on any device.

 We are looking for an experienced SRE Engineer — someone who takes ownership, solves problems independently, and treats production systems with care and respect.
You’ll join a team that keeps business-critical telephony and communication services running with 99.999% availability. We need someone who not only reacts to incidents but also anticipates them — who improves systems, automates routine tasks, and helps shape how the team works.

Key Responsibilities:

• Support and maintain Linux-based servers and telephony services in production.

• Investigate and resolve incidents in a high-load, distributed environment.

• Participate in on-call shifts and ensure the stability of systems under strict SLAs.

• Analyze service performance, reliability, and architecture bottlenecks; propose improvements.

• Work with development teams to safely deliver and validate changes before production deployment.

• Contribute ideas and help evolve team processes, automation, and monitoring practices.

Requirements:

• Strong experience with UNIX/Linux systems and using the CLI for troubleshooting.

• Good understanding of networking protocols and SIP.

• Strong hands-on experience with Kubernetes (k8s) and containerized environments.

• Proven track record of working in production environments, with a careful and methodical approach to changes (testing before deployment, rollback planning, risk mitigation).

• Understanding of high-availability systems, fault tolerance, and performance optimization.

• Experience automating tasks with Python, Golang, or Shell scripts.
  Mindset of an SRE: you treat operations as an engineering discipline and continuously look for ways to make systems more reliable and efficient.

• Good command of English (B2 or higher) — ability to communicate effectively with distributed international teams (both written and spoken).

Would be a plus:

• Deep expertise in one or more areas (please highlight your strengths in your application).

• Hands-on experience with Kamailio, Apache Kafka, Nginx, ZeroMQ.

• Experience with AWS/EKS, Terraform, and Ansible for deployment and infrastructure automation.

• Experience with CI/CD pipelines (e.g., GitLab CI, Jenkins, ArgoCD).

• Knowledge of monitoring stacks like Zabbix, TICK, ELK, Grafana.
   

What you’ll get:

• Work in a strong, experienced SRE team that maintains global infrastructure across multiple regions.

• Hands-on experience debugging Java and C++ applications in large distributed systems (Kafka, Zookeeper, Kamailio, Nginx, etc.).

• Opportunity to influence how the team works — your ideas for tools, automation, or process improvements will be heard and implemented.

• Real experience achieving five-nines availability (99.999%) in production.

• Continuous learning, complex technical challenges, and a supportive environment.

What we offer: 

• Well-coordinated professional team.

• Cutting edge technologies, interesting and challenging tasks, dynamic projects, great opportunities for self-realization, professional and career growth.

• Additional Health and Life Insurance Package.

• Employee Assistance Program.

• 25 vacation days.

• 102,26 EUR/200 BGN Digital Food Vouchers.

• 61, 36 EUR/120 BGN Gross as part of the salary for Working Expenses Allowance.

• Multisport card option

About RingCentral

RingCentral, Inc. (NYSE: RNG) is a leading provider of business cloud communications and contact center solutions based on its powerful Message Video Phone™  (MVP™) global platform. More flexible and cost effective than legacy on-premises PBX and video conferencing systems that it replaces, RingCentral® empowers modern mobile and distributed workforces to communicate, collaborate, and connect via any mode, any device, and any location. RingCentral is headquartered in Belmont, California, and has offices around the world.

RingCentral is an equal opportunity employer that truly values diversity. We do not discriminate on the basis of race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, or disability status.