Location: Manhattan, NY (Onsite) | Compensation: $200,000 – $300,000 | Equity: 0.25% – 1%
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.
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.
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Build and own voice AI infrastructure on top of LiveKit
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Design orchestration systems including state management, latency optimization, and reliability
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Own prompting strategy including conversation flows, tone, compliance-safe language, and edge-case handling
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Develop evaluation frameworks including A/B testing, regression testing, and KPI tracking
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Continuously improve voice agent performance using real-world call data and outcomes
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Optimize ASR, STT, TTS, turn-taking, and interruption handling
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Build scalable systems supporting millions of voice interactions
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Migrate legacy implementations to modern voice AI infrastructure
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Collaborate with product, operations, and leadership to align technical systems with business outcomes
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2+ years experience in voice AI, conversational AI, prompt engineering, or speech systems
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3+ years experience in backend, platform, or infrastructure engineering
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Strong experience with Node.js, AWS, and SQL
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Experience building and shipping production systems in fast-paced environments
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Experience with voice orchestration frameworks such as LiveKit or similar
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Strong prompt design and conversational flow development skills
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Strong analytical ability to tie system performance to business metrics
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Excellent English communication skills required
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Must be based in or willing to relocate to NYC and work onsite
No visa sponsorship available.
Initial call with Founder and CEO Take-home assignment Technical interview Offer
