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MMDSmart • Georgia, United States
Role & seniority: Senior QA Engineer / QA Engineer with a focus on VoIP and real-time communications
Stack/tools: SIP/RTP, WebRTC, IVR/ACD/call-routing, call recording, PCAPs and server logs analysis, Linux, TCP/IP/NAT/Firewall, STUN/TURN, Python/JS/TS scripting, REST API testing (Postman/curl)
Design and execute advanced test strategies across the full communications lifecycle, ensuring WebRTC, IVR, ACD, and recording integrations work seamlessly
Analyze business requirements and technical specs; investigate complex call flows and media issues using PCAPs and logs; identify root causes before production
mentor the team, improve QA processes, document RCAs, and promote testability and system stability in an Agile environment
5+ years software testing; 2+ years in VoIP/real-time communication
Strong SIP understanding (call flows, INVITE, SDP, RTP) and SIP/RTP traffic analysis
Experience testing CCaaS/IVR/ACD/call lifecycle; WebRTC and real-time comm challenges
Voice quality metrics (latency, jitter, packet loss, MOS) and debugging audio issues (one-way, delayed media)
Networking basics (TCP/IP, NAT, firewalls, ports; STUN/TURN); Linux + server logs
Scripting (Python/JS/TS) for tooling; REST API testing
Playwright or similar test automation; API automation (pytest, REST Assured)
Performance/load tools (k6, JMeter, Locust); SIP traffic simulation (SIPp)
PBX/SBC/soft
Would you like to build a career in a leading multinational IT company? We are looking for a QA engineer who behaves more like a voice system investigator than a checklist tester to join our team. Since 2007, MMDSmart has been a leading supplier in cloud communications, delivering game-changing IT products to businesses in over 100 countries. Our success is fueled by the inspiration and innovative ideas of our team members, encouraging their growth and impacting our Messaging and Voice solutions. These empower our clients to communicate more effectively with their customers. Don’t miss this chance to excel in a rapidly expanding tech company, where your potential and ambitions are not just recognized but celebrated.
What will you do at MMDSmart? 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 "Voice System Investigator" performing deep-dive analysis of complex call flows and media streams using packet captures (PCAPs) and server logs to identify the root cause of signaling and audio defects. You will design and execute advanced test strategies that cover the entire communication lifecycle, ensuring seamless integration between WebRTC components, IVR logic, ACD routing, and call recording systems. You will investigate the intersection of web application states and real-time media, debugging issues like UI/UX synchronization with agent states, call control race conditions, and WebRTC connectivity hurdles. You will proactively simulate network impairments (latency, jitter, packet loss) and use voice quality metrics (MOS) to ensure the system remains resilient and high-performing under sub-optimal conditions. You will drive quality improvements within an Agile environment, participating in architectural reviews and brainstorming sessions to advocate for testability and system stability. You will mentor the team and improve QA processes, sharing your expertise in troubleshooting stateful, event-driven systems and helping to refine estimation and testing methodologies. You will maintain technical documentation and RCA (Root Cause Analysis) reports, ensuring that complex "hard-to-reproduce" bugs are well-documented and that the team learns from every critical leak.
Familiarity with performance / load tools: (k6, JMeter, Locust) Experience simulating SIP traffic using SIPp Experience working with PBX / SBC / softswitches (Asterisk, FreeSWITCH, Zoiper, etc.) Experience testing under network impairment (packet loss / delay simulation) Why do talents choose and stay at MMDSmart?
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. Think this role's got your name on it? Go ahead and apply, we'd love to see what you've got! Equal-Opportunity Employment We are an equal opportunity employer committed to creating a diverse and inclusive work environment. All qualified applicants will receive consideration for employment without regard to race, color, religion, gender, gender identity or expression, sexual orientation, national origin, genetics, disability, age, or veteran status. *Medical Insurance and Sport Card perks are available for employees located in Bulgaria.