Close Call, a Voice AI Sales Coach
TL;DR
I built an open-source voice agent that lets salespeople practice tough calls against an AI customer. It runs on Pipecat + Gemini 2.5 Flash, costs about $0.14 per call, and my team's first reaction was genuinely enthusiastic. The code is on GitHub if you want to try it.
"Sales cures all ills" is a phrase one of my first mentors repeated often, and it stuck with me. Before I got serious about software development and before meddling with AI engineering, I was a salesperson. I still miss the thrill of closing a deal and outmaneuvering your opponent. It was fun. Now that I'm in a position to use AI at my company, I came up with an idea: use voice-enabled AI to help train and coach our salespeople.
From a technology standpoint, this was a relatively simple implementation. I built Close Call, an open-source voice agent where a salesperson picks a scenario, clicks "Start Call," and talks to an AI customer who pushes back with realistic objections. Immediately after, the system performs an assessment and provides feedback that highlights where the salesperson performed well and what could be improved.
I've done an initial demo at my company. The feedback was positive, very positive, in fact.