BSG is a Communication Platform as a Service (CPaaS) that helps businesses connect with customers across multiple channels through flexible, cloud-based communication solutions.
We are looking for a strong backend/software engineer who can design and build scalable production Voice AI systems, with a focus on distributed systems, real-time processing, asynchronous architecture, streaming, and low-latency voice interactions.
Current tech stack: Python, FastAPI, Django, RabbitMQ, Memcached, JavaScript, REST, WebSocket, AI/Voice APIs.
Your Responsibilities
- Design and develop production-grade Voice AI systems and backend services.
- Build the full voice pipeline: Audio STT/ASR LLM TTS Audio.
- Integrate external and self-hosted AI/Voice models and APIs.
- Build real-time streaming services for bidirectional voice conversations.
- Work with streaming STT, LLM and TTS and optimize end-to-end latency and time-to-first-audio.
- Implement conversation state, context management and interruption/barge-in handling.
- Integrate Voice AI with telephony, telecom and business systems.
- Develop APIs and asynchronous, event-driven services using message brokers.
- Ensure high performance, reliability, scalability and observability of production systems.
- Monitor and analyze latency, recognition quality, voice quality, errors and conversation stability.
- Design solutions capable of supporting high volumes of concurrent calls.
- Participate in architecture decisions, code reviews and technical improvements across projects.
What We Expect
- 5+ years of commercial backend/software development experience.
- Strong proficiency in Python, Go, Java, Node.js/TypeScript, C# or another modern backend language.
- Solid understanding of OOP, APIs, concurrency and asynchronous programming.
- Experience building and maintaining production-grade backend services.
- Strong understanding of distributed systems and event-driven architecture.
- Experience with REST APIs, WebSockets and real-time/streaming systems.
- Experience with message brokers such as RabbitMQ or Redis.
- Ability to work with a new programming language and technology stack; Python is a strong advantage as it is the primary backend language in the current stack.
- Experience integrating external APIs, ideally including AI/LLM/Voice APIs.
- Understanding of Docker, CI/CD, monitoring and logging.
- Ability to design scalable, reliable and observable systems.
Nice to Have
- Voice AI / conversational AI / Speech-to-Speech
- STT / ASR / TTS / LLM
- SIP, VoIP, WebRTC, RTP or SIP trunking
- Asterisk, FreeSWITCH or similar telephony platforms
- Real-time audio processing and codecs
- Low-latency real-time systems
- Call-center or telecom infrastructure
- Experience with self-hosted AI models
What We Offer
- Fully remote work with a flexible schedule.
- Competitive salary and 24 days of paid vacation.
- A technically strong team open to innovation and collaboration.
- Work on AI and communication products for the global market.
- Professional growth and participation in complex, technically challenging projects.
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