Performance QA Engineer

Location: Bulgaria

Time Type: Full time

Job Description

Say hello to opportunities.

 It’s not every day that you consider starting a new career. We’re RingCentral, and we’re happy that someone as talented as you is considering this role. First, a little about us, we’re a $2 Billion annual revenue company with double digit Annual Recurring Revenue (ARR) and a $93 Billion market opportunity in UCaaS, Contact Center and AI-powered adjacencies. We invest more than $250 million annually to ensure our AI-enabled technology and platforms meet or exceed the needs of our customers. 
 

We are looking for a Performance QA Engineer with a strong analytical mindset to design, execute, and continuously improve performance testing practices across our system and its services. This role is ideal for a strong middle or senior-level engineer who is comfortable working to guard our system’s performance, collaborating with DevOps, Development and Management teams, and turning performance data into clear, actionable insights.

You will play a key role in ensuring system reliability, scalability, and stability under real-world and peak-load conditions.
 

This role requires on-site presence at our office 4 days a week to support effective collaboration and teamwork.

Responsibilities

• Design, develop, maintain, and extend performance tests for backend services and APIs
• Take ownership of existing performance test suites, including inherited, internally or externally developed tests, ensuring their stability, relevance, and documentation
• Actively participate in knowledge transfer and onboarding of performance tests from other teams
• Analyze performance test results, identify bottlenecks, and provide clear, data-driven recommendations
• Collaborate closely with Developers, DevOps, and SRE teams to diagnose performance issues and validate fixes
• Prepare and maintain clear test documentation, test plans, and performance reports in Atlassian Wiki
• Monitor application and infrastructure metrics during tests and in production-like environments
• Contribute to improving team-wide performance testing standards, approaches, and tooling

Required Skills & Experience

Core Skills

• Strong hands-on experience with performance testing of distributed systems
• Solid understanding of SDLC and quality assurance practices
• Proven experience in data analysis, interpreting metrics, logs, and trends
• Strong analytical mindset with the ability to translate complex data into actionable conclusions
• Experience working with APIs (REST; SOAP is a plus)

Technical Stack

• Performance Testing: JMeter
• Programming & Scripting: Java, Python, Bash
• Version Control: Git
• Monitoring & Observability: Grafana, Kibana, Zabbix, Victoria Metrics
• Containerization & Orchestration: Kubernetes (k8s)
• CI/CD & Automation: Ansible, Jenkins
• Tooling & Collaboration: Jira, Atlassian Wiki (Confluence)

Nice to Have

• Experience with cloud-based or microservice architectures
• Knowledge of JVM internals and performance tuning
• Experience with CI/CD systems (e.g., Jenkins jobs, GitLab pipelines)
• Familiarity with infrastructure monitoring and capacity planning
• Experience mentoring or guiding junior engineers

Soft Skills

• Strong communication skills, both written and verbal
• Ability to clearly explain performance issues, risks, and results
• Confident English and Russian proficiency (reading, writing, and speaking) for daily communication and documentation
• Proactive, ownership-driven mindset
• Ability to work effectively in cross-functional and distributed teams

​What we offer: 

• Well-coordinated professional team.
• Cutting edge technologies, interesting and challenging tasks, dynamic project, 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.

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.