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AIM AI Linkedin · Posted 4mo ago

Software Engineer

Seoul

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Company Description

Aim AI is a bootstrapped, profitable, and scaling fast with ~$5M ARR. We build ultra-realistic voice AI agents that power real phone conversations for businesses in sales, customer service, marketing, and beyond. Our platform handles live calls end-to-end, and every millisecond counts.

We're looking for a Full-Stack Engineer to own and evolve the core backbone of our system, the infrastructure that makes calls sound seamless (or breaks if we get it wrong).


Not currently sponsoring work visas in Korea


What You'll Do

  • Architect and operate low-latency, high-throughput systems for live phone calls and bidirectional audio streaming
  • Build backend orchestration services (primarily Node.js / TypeScript, with Python or Go as needed) that integrate STT, TTS, LLMs, and telephony providers
  • Work hands-on with WebSockets, WebRTC, streaming audio pipelines, and real-time event processing
  • Contribute to our agent builder dashboard and developer tools (React / Next.js)
  • Integrate deeply with Twilio, SIP trunks, VoIP systems, and carrier constraints. Also handling IVRs, transfers, DTMF, call drops, and compliance edge cases
  • Anticipate scaling bottlenecks; drive improvements in reliability, observability, failover, monitoring, alerting, and logging
  • Enforce security and compliance best practices across the stack


The Interesting Problems You'll Own

  • Bridging decades-old telephony systems with modern real-time AI architectures
  • Solving latency, jitter, and reliability at scale, where milliseconds determine success
  • Designing concurrent streaming pipelines for live audio → transcription → reasoning → response


What Makes You a Great Fit

  • 2+ years building production-grade systems (senior-level experience strongly preferred)
  • Deep expertise in JavaScript / TypeScript and Node.js
  • Hands-on experience with real-time technologies (WebSockets, WebRTC, streaming audio/video)
  • Strong English communication skills and the availability to work US time zones
  • Strong fundamentals in networking, latency optimization, and system design
  • Startup DNA: high ownership, execution bias, ability to ship fast in a low-politics environment
  • Opinionated yet pragmatic, you know when to push for elegance and when to ship


Our Tech Stack

  • Backend: Node.js, TypeScript, Python, and Go
  • Frontend: React, Next.js
  • Real-time: WebSockets, WebRTC
  • Telephony: Twilio, SIP, VoIP
  • AI/voice: SST, TTS, and LLMs
  • Infra: Docker, Kubernetes, Cloudflare


Bonus Points For

  • Prior experience with telephony / VoIP systems
  • Background in real-time audio or video infrastructure
  • ML infra, model serving, or AI agent platforms
  • Voice AI or conversational AI exposure


Why Join Aim AI?

  • ~$5M ARR, bootstrapped, and growing quickly with production traffic that matters
  • Extremely high ownership, low politics, ship fast, see impact immediately
  • Work on cool voice AI where reliability directly drives customer outcomes
  • If you're excited about building infrastructure that powers realistic AI phone calls at scale, we'd love to hear from you.
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