Voice AI Engineer

About CollectWise

CollectWise is a YC-backed startup using generative AI to automate debt collection in a $35B US market. Their AI agents are already outperforming human collectors by 2x at significantly lower cost. With a team of five, they have scaled to a $2M annualized run rate and are targeting $10M ARR within the year.

The Role

This role owns the full voice AI stack end-to-end. You will design and build real-time conversational agent systems that operate at production scale across millions of interactions. The role combines infrastructure engineering, prompt engineering, and applied AI in a highly regulated environment.

What You'll Do

• Build and own voice AI infrastructure on top of LiveKit
• Design orchestration systems including state management, latency optimization, and reliability
• Own prompting strategy including conversation flows, tone, compliance-safe language, and edge-case handling
• Develop evaluation frameworks including A/B testing, regression testing, and KPI tracking
• Continuously improve voice agent performance using real-world call data and outcomes
• Optimize ASR, STT, TTS, turn-taking, and interruption handling
• Build scalable systems supporting millions of voice interactions
• Migrate legacy implementations to modern voice AI infrastructure
• Collaborate with product, operations, and leadership to align technical systems with business outcomes

What We're Looking For

• 2+ years experience in voice AI, conversational AI, prompt engineering, or speech systems
• 3+ years experience in backend, platform, or infrastructure engineering
• Strong experience with Node.js, AWS, and SQL
• Experience building and shipping production systems in fast-paced environments
• Experience with voice orchestration frameworks such as LiveKit or similar
• Strong prompt design and conversational flow development skills
• Strong analytical ability to tie system performance to business metrics
• Excellent English communication skills required
• Must be based in or willing to relocate to NYC and work onsite

No visa sponsorship available.

Interview Process

Initial call with Founder and CEO → Take-home assignment → Technical interview → Offer