Senior Full Stack Engineer, Voice Agent (IVA)
Ukraine
We are looking for a Senior Full Stack Engineer with strong experience in VoIP, SIP telephony, and conversational AI to join a Healthcare product. You will help develop an intelligent voice solution that automates pharmacy calls, processes prescription-related requests, and connects patients with pharmacy staff when needed.
Responsibilities:
- Develop and improve the voice agent, including conversation flows, patient verification, fallback scenarios, and call transfers;
- Build backend services and integrations with pharmacy management systems;
- Maintain the telephony layer, including SIP, RTP, codecs, DTMF, and PBX integrations;
- Optimize STT, LLM, and TTS pipelines for performance, accuracy, latency, and cost;
- Implement monitoring, call tracing, quality evaluation, and regression testing;
- Investigate production issues and contribute to architectural decisions.
Requirements:
- Senior-level experience in backend or full-stack development;
- Strong knowledge of Python or TypeScript/Node.js;
- Hands-on production experience with VoIP and SIP telephony;
- Experience building IVR systems, voice bots, or LLM-powered voice agents;
- Understanding of STT, TTS, turn-taking, tool calling, and real-time voice processing;
- Experience integrating LLMs and third-party systems into production;
- Working knowledge of Asterisk or a similar PBX;
- Strong problem-solving, ownership, and communication skills.
Benefits:
- Flexible working hours;
- 25 paid days off and 10 sick/medical leaves;
- Additional paid days off for personal events like marriage and childbirth;
- Maternity/Paternity leaves;
- Skills Evaluations and promotions are based on Corporate Matrix;
- Discount program;
- Self-development budget per year;
- Referral bonuses;
- Corporate events and gifts;
- Learning events and mentorship opportunities;
- Speaking Clubs;
- PE accounting and support.