Open Position
Back-End Developer
Build carrier-grade VoIP platforms and communication APIs that handle millions of concurrent connections. Full-time, Ramat Gan / Remote.
About the Role
We're looking for a Back-End Developer to join our core engineering team and build the server-side systems that power global telecom infrastructure. You'll work on VoIP platform development, communication API layers, billing engines, and real-time media processing — systems that need to handle carrier-grade traffic with 99.99% uptime.
Responsibilities
- Design and develop back-end services for VoIP platforms, communication APIs, and telecom infrastructure
- Build and maintain RESTful APIs and WebSocket services for real-time communication features
- Integrate with VoIP engines (FreeSWITCH, Asterisk, OpenSIPS, Kamailio) for call routing, IVR, and media processing
- Develop billing engines, CDR processing pipelines, and rating systems for telecom operators
- Implement database schemas, query optimization, and data migration strategies
- Build queue-based processing systems for high-throughput messaging and event handling
- Write comprehensive tests and maintain CI/CD pipelines
- Participate in on-call rotations for production systems (carrier-grade uptime requirements)
Requirements
- 3+ years of professional back-end development experience
- Strong proficiency in Node.js and/or Python
- Experience with relational databases (PostgreSQL) and caching layers (Redis)
- Understanding of RESTful API design, authentication (OAuth2, JWT), and rate limiting
- Experience with message queues (RabbitMQ, Kafka) and event-driven architectures
- Familiarity with Docker, Kubernetes, and cloud platforms (AWS or GCP)
- Strong understanding of networking fundamentals (TCP/UDP, HTTP, DNS)
- Experience with AI-based development and automation tools (Claude Code, Copilot, or similar AI assistants)
- Excellent communication skills in English
Nice to Have
- Experience with VoIP protocols (SIP, RTP, SRTP) and telecom systems
- Knowledge of FreeSWITCH, Asterisk, OpenSIPS, or Kamailio
- Experience with PHP or Ruby for legacy system maintenance
- Familiarity with AI/ML integration (ElevenLabs, LiveKit, Vapi)
Tech Stack
Node.jsPythonTypeScriptPostgreSQLRedisRabbitMQDockerKubernetesFreeSWITCHAsteriskOpenSIPSAWS/GCPGit
This role includes all of our benefits and perks, including competitive salary, hybrid working model, professional development budget, and international travel opportunities.