Software Development Engineer in Test (SDET) – Web Performance and Analytics Team

Role Overview We are seeking a highly experienced Senior SDET to join our Web Performance and Analytics Team. The successful candidate will play a pivotal role in ensuring the reliability, speed, and data accuracy of high-traffic web applications and analytics platforms. This position demands a strong blend of software engineering, test automation expertise, deep understanding of web technologies, and proactive ownership of quality processes.  The ideal candidate is goal-oriented, demonstrates excellent multicultural communication abilities, and possesses the technical depth required to design, implement, and maintain sophisticated test solutions in a fast-paced, international environment. This role requires on-site presence at our office 4 days a week to support effective collaboration and teamwork. Key Responsibilities - Proactively expand and maintain comprehensive test coverage for web applications and analytics features: design, develop, execute tests, continuously maintain automated functional and integration tests; analyse test results and drive coverage improvements.  -  Proactive agentic AI usage for testing purposes and daily tasks. - Conduct exploratory testing and perform detailed review of automated test results across multiple environments (staging, production-like, cross-browser, cross-device) utilising varied test data sets.  - Participate actively in the full software development lifecycle: attend sprint planning, provide early design and code review feedback, contribute to the definition of done, and advocate for quality and maintainability improvements. - Contribute to the continuous enhancement of QA processes, tools, infrastructure, and methodologies within the team and across the organisation. - Prepare and maintain clear, accurate documentation for test strategies, frameworks, execution guidelines, and troubleshooting procedures — suitable for both internal teams and external stakeholders/vendors. - Engage in effective, goal-oriented communication during team collaborations, root-cause investigations, stakeholder meetings, and vendor interactions; demonstrate strong proficiency in English, cultural sensitivity, patience, politeness, and tolerance of diverse working styles. - Identify opportunities for test automation expansion, including non-functional aspects (performance, reliability, scalability), and implement corresponding solutions.  - Responsible use of AI tools to increase the efficiency of manual work is a plus.   Required Qualifications and Skills - 4+ years of hands-on experience in software testing and automation,   - Strong proficiency in modern web technologies: HTML5, CSS3, JavaScript/Playwright,K8S, DOM manipulation, asynchronous programming, REST/GraphQL APIs, SPA, Docker - Strong skills in test automation development using industry-standard tools and frameworks (e.g., Playwright, Cypress, Selenium WebDriver, WebdriverIO, Puppeteer).   - Familiar with CI/CD pipelines and integration of automated tests into development workflows. - Good programming skills in at least one language relevant to test automation (JavaScript/TypeScript preferred; Python, Java acceptable). - Excellent command of written and spoken English; proven ability to communicate clearly, politely, and effectively in multicultural, distributed teams. - Demonstrated proactive mindset, goal orientation, and ownership of quality outcomes. - Familiarity with agile/Scrum methodologies and experience collaborating in cross-functional teams. Preferred Qualifications - Basic experience with performance testing and analysis tools (e.g., Lighthouse, WebPageTest, Chrome DevTools Performance panel, Grafana, New Relic, Datadog, or equivalent). - Understanding of cloud infrastructure (AWS, GCP, Azure) and containerisation (Docker, Kubernetes) in relation to test environments.   -Experience with analytics platforms, tracking implementation testing (e.g., Google Analytics, Adobe Analytics, custom event tracking), and data validation in web environments.   - Basic understanding of web performance metrics, browser rendering pipeline, resource optimisation techniques, and common performance anti-patterns.   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. 61, 36 EUR/120 BGN Gross as part of the salary for Working Expenses Allowance. 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.  #LI-JW1