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How I AI1,000 days of Duolingo didn't work. So he built his own app with Codex.
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Episode Details
EPISODE INFO
- Released
- November 9, 2026
- Duration
- 38m
- Channel
- How I AI
- Watch on YouTube
- ▶ Open ↗
EPISODE DESCRIPTION
William Imoh is the founder of Hackmamba, a developer marketing company, and the creator of Mural, a real-time voice app he built to learn Norwegian after moving from Dubai to Norway. He has a chemical engineering degree, taught himself to code, and spent four years as a product manager, but he had never written a line of Swift. In this episode, William shows how he used Codex and GPT-Live to build Mural natively for iOS and Android, then walks through the Lord of the Rings–themed Grok Bot “fellowship” that helps him run a team of about 25 as a solo founder. What you’ll learn:
- The design prompt that made Mural look nothing like any other language app
- Why 1,000 days of Duolingo left him unable to hold a conversation in Norwegian
- What GPT-Live-1 costs per session and the latency threshold that makes or breaks a voice tutor
- How he assigned every solo founder role to a Lord of the Rings character in Grok
- Why he gave his agents access to everything across 15 open tabs, except one thing
- What he still has to do himself after the models improved
- Why the fear that keeps him up isn’t replacement—it’s dependency
*Brought to you by:* WorkOS—Make your app enterprise-ready, with SSO, SCIM, RBAC, and more: https://workos.com?utm_source=lennys_howiai&utm_medium=podcast&utm_campaign=q22025 Vanta—Automate compliance and simplify security: https://www.vanta.com/howiai *In this episode, we cover:* (00:00) Teaser (02:52) Introduction to William and his language learning app (05:58) William’s tech background and how he started building (08:07) The first prompt (11:09) The importance of design language and articulation (14:38) Live demo: a Norwegian conversation (21:11) Having a growth mindset (22:48) Why GPT Live works for this (23:34) What it costs to run (24:50) Running Hackmamba with agents (26:58) Codex projects for organization (28:47) His Lord of the Rings Grok Bot fellowship (34:05) Recap (34:54) Prompting strategies (37:21) Where to find William *References:*
- Mural on GitHub: https://github.com/Chuloo/mural
- Codex: https://chatgpt.com/codex
- GPT-Live: https://openai.com/index/introducing-gpt-live/
- Grok Bot: https://grokbot.com/
- Cursor: https://cursor.com/
- Boki: https://boki.io/
- Notion: https://www.notion.com/
*Where to find William Imoh:* X: https://x.com/iChuloo LinkedIn: https://www.linkedin.com/in/william-imoh Hackmamba: https://hackmamba.io/ Hackmamba Podcast: https://hackmamba.io/eoc-podcast/ Mural: https://mural.chat/ *Where to find Claire Vo:* ChatPRD: https://www.chatprd.ai/ Website: https://clairevo.com/ LinkedIn: https://www.linkedin.com/in/clairevo/ X: https://x.com/clairevo *Have a really cool use case of how you use AI in your work? Let us know:* https://docs.google.com/forms/d/e/1FAIpQLSfP8wYCeDo5K0DxscDmoqgkxYY8ngA3B2anUDDvC4xadGTerg/viewform _Production and marketing by https://penname.co/._ _For inquiries about sponsoring the podcast, email jordan@penname.co.)
SPEAKERS
William Imoh
guestFounder of Hackmamba and creator of the Mural Chat language-learning app.
Claire Vo
hostProduct leader and host of the podcast “How I AI with Claire Vo.”
EPISODE SUMMARY
In this episode of How I AI, featuring William Imoh and Claire Vo, 1,000 days of Duolingo didn't work. So he built his own app with Codex. explores He built a Norwegian tutor app and runs work with agents William Imoh built Mural Chat to practice spoken Norwegian with a nonjudgmental partner that corrects mistakes and forces immersion when locals switch to English.
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