Senior Java Engineer (VoIP)

We're looking for a Senior Java Engineer with VoIP experience to join a dedicated product team building real-time communication systems for an international client. You'll own backend architecture, work closely with mobile and frontend teams, and ship features that handle voice, video, and signaling at scale.
 

Requirements:

• 5+ years of backend development with Java (Spring / Spring Boot)
• Strong experience with WebRTC protocols and architecture
• VoIP / SIP / RTP / signaling servers
• Experience integrating backend systems with iOS and Android applications
• Real-time data streaming, distributed systems, microservices architecture
• Cloud platforms (AWS / GCP / Azure)
• Kafka, WebSockets, REST APIs
• PostgreSQL / MySQL
• English: B2+ (daily communication with the product team)
   

Nice to have:

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

What you'll do:

• 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
   

We offer:

• Full remote
• Location: Armenia, Poland, Ukraine, Eastern Europe
• Paid vacation and sick leave
• Competitive rate
• Direct communication, no bureaucracy
• Long-term engagement on a dedicated product team