1,000 days of Duolingo didn't work. So he built his own app with Codex.
William Imoh, founder of Hackmamba, details how he built Mural—a real-time voice app for learning Norwegian—using Codex and GPT-Live without writing any native Swift or Kotlin code. He explains how prompt specificity and design vocabulary enabled him to achieve high-end native UI aesthetics, while contrasting real immersion against Duolingo's limitations. Additionally, Imoh shares his autonomous agent infrastructure, using a Lord of the Rings-themed Grok Bot fellowship and full tool access to run operations as a solo founder, alongside the existential dread of becoming operationally dependent on AI.
- William Imoh built Mural, a real-time voice app for learning Norwegian, in Swift and Kotlin without writing native code himself. Read →
- William Imoh gives autonomous agents unrestricted read and write access to his email, calendar, Linear, and Notion, restricting only raw customer data and company bank accounts. Read →
- William Imoh, founder of Hackmamba, automated core company operations by building a multi-agent system in Grok Bot instead of hiring administrative staff. Read →
- William Imoh built Mural, a real-time voice app for learning Norwegian, using Codex and GPT-Live without writing native Swift or Kotlin code. Read →
- William Imoh maintained a 1,000-day streak on Duolingo and passed his official Norwegian exams, yet could not hold a basic conversation after moving to Norway. Read →