Senior Software Engineer

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). What You'll Do Architect and operate low-latency, high-throughput systems for live phone calls and bidirectional audio streamingBuild backend orchestration services (primarily Node.js / TypeScript, with Python or Go as needed) that integrate STT, TTS, LLMs, and telephony providersWork hands-on with WebSockets, WebRTC, streaming audio pipelines, and real-time event processingContribute 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 casesAnticipate scaling bottlenecks; drive improvements in reliability, observability, failover, monitoring, alerting, and loggingEnforce security and compliance best practices across the stack The Interesting Problems You'll Own Bridging decades-old telephony systems with modern real-time AI architecturesSolving latency, jitter, and reliability at scale, where milliseconds determine successDesigning concurrent streaming pipelines for live audio → transcription → reasoning → response What Makes You a Great Fit 5+ years building production-grade systems (senior-level experience strongly preferred)Deep expertise in JavaScript / TypeScript and Node.jsHands-on experience with real-time technologies (WebSockets, WebRTC, streaming audio/video)Comfortable owning both backend and frontendStrong fundamentals in networking, latency optimization, and system designStartup DNA: high ownership, execution bias, ability to ship fast in a low-politics environmentOpinionated yet pragmatic, you know when to push for elegance and when to ship Our Tech Stack Backend: Node.js, TypeScript, Python, and GoFrontend: React, Next.jsReal-time: WebSockets, WebRTCTelephony: Twilio, SIP, VoIPAI/voice: SST, TTS, and LLMsInfra: Docker, Kubernetes, Cloudflare Bonus Points For Prior experience with telephony / VoIP systemsBackground in real-time audio or video infrastructureML infra, model serving, or AI agent platformsVoice AI or conversational AI exposure Why Join Aim AI? ~$5M ARR, bootstrapped, and growing quickly with production traffic that mattersExtremely high ownership, low politics, ship fast, see impact immediatelyWork on cool voice AI where reliability directly drives customer outcomesIf you're excited about building infrastructure that powers realistic AI phone calls at scale, we'd love to hear from you.