details-144401-senior-qa-engineer?utm source=jooble&utm medium=cpc&utm campaign=jooble

Senior QA Engineer, Serbia (or remote)
This role is focused mainly on manual and system-level testing, including end-to-end validation, API/backend flows, and investigation of complex issues across the platform.
For which tasks (responsibilities)?
You will analyze business requirements and technical specifications for both web interfaces and backend, proactively challenging architectural assumptions to prevent issues before they reach production.
You will act as a System Investigator - performing deep-dive analysis of complex multi-channel message flows using platform logs, webhook payloads, and event traces to identify root causes of delivery and logic defects across SMS, Telegram, Viber, and other channels.
You will design and execute advanced end-to-end test strategies that cover the full message lifecycle - from operator action in the web UI, through API and channel gateway, to delivery confirmation - ensuring what the client experiences matches expected behavior.
You will contribute to performance testing efforts using Locust and other tooling, covering throughput of message delivery, API response times under load, and system resilience under concurrent channel activity.
You will drive quality improvements within an Agile environment, participating in architectural reviews and brainstorming sessions to advocate for testability, observability, and system stability.
You are a perfect match if you have:
5+ years of software testing experience;
Strong understanding of web platform testing (UI + backend);
Ability to debug logic defects across distributed flows;
REST API testing (Postman, curl, or similar);
Experience validating webhook and callback flows;
Understanding of channel-specific delivery logic;
Understanding API automation (pytest, REST Assured, or similar);
Basic scripting in JS/TS or Python for test tooling;
Experience working in Linux environments and reading server logs;
Familiarity with Docker / Kubernetes for local/staging environments;
Experience with Grafana or similar monitoring/dashboarding tools.
Benefits:
Embrace the opportunity to work in a company that cares about:
Your Wellness: Access to mental health programs, comprehensive medical insurance, and a sports card*.
Your Happiness: Enjoy the company of cool teammates, a friendly atmosphere, a strong mentorship, and a variety of bonuses & corporate gifts.
Your Development: Benefit from free educational events & courses, and English classes with native speakers.
Your Career: Focus on your professional development in a supportive environment.
Work-Life Balance: Choose your working format - remote, office-based, or hybrid and engage in team-building activities.
Apply