Senior Java engineer with VOIP experience

Key Responsibilities:

• Design and develop high-performance backend services using Java (Spring Boot) Build and maintain real-time communication systems (WebRTC, VoIP, SIP)
• Integrate backend systems with mobile applications (iOS & Android)
• Work with streaming, signaling, and media servers
• Ensure low-latency, high-availability architecture
• Collaborate with cross-functional teams (mobile, frontend, DevOps)
• Optimize system performance, scalability, and reliability

Required Experience:

• 5+ years of experience with Java (Spring / Spring Boot)
• Strong experience with:
• WebRTC (WTRC) protocols and architecture VoIP / SIP / RTP / signaling servers
• Experience integrating with iOS and Android applications
• Solid understanding of:
• Real-time data streaming Distributed systems Microservices architecture
• Experience with cloud platforms (AWS / GCP / Azure) Familiarity with Kafka / WebSockets / REST APIs

Nice to Have Experience with:

• Twilio / Agora / Vonage / similar RTC platforms Media servers (Kurento, Janus, FreeSWITCH, Asterisk)
• Knowledge of AI/voice processing / speech analytics
• Experience in telecom or communication products

Location: Armenia, Poland, Ukraine, Eastern Europe