# How William Imoh Built a Language App Using Generative AI

Founder William Imoh leverages Codex and GPT-Live to innovate beyond traditional language learning models.

- **Source:** [Lenny's Newsletter](https://www.lennysnewsletter.com)
- **Published:** 2026-11-09
- **Topic:** [careers](https://brifing.si/c/careers)
- **Original article:** <https://www.lennysnewsletter.com/p/how-this-founder-built-a-better-duolingo>
- **On Brifing:** https://brifing.si/s/91fa1aa6-3f26-4e27-86aa-f56c827798f8

## Transitioning to Language Innovation

William Imoh, founder of Hackmamba, created Mural, a real-time voice application designed to facilitate Norwegian language learning. After moving from Dubai to Norway, Imoh found that traditional platforms like Duolingo were insufficient for conversational fluency. He leveraged his background in chemical engineering and product management to build this new solution.

## Technical Execution via AI

Despite having no prior experience writing Swift code, Imoh successfully built Mural natively for both iOS and Android platforms. He utilized Codex and GPT-Live to bridge his technical knowledge gaps. This approach allowed him to rapidly prototype and deploy a functional application without needing a traditional software engineering team.

## Addressing Latency and Costs

The development process focused heavily on the latency threshold, which is critical for a voice-based tutor to feel natural. Imoh analyzed the specific costs associated with running GPT-Live-1 per session. His design prompt ensured that Mural maintains a unique visual and functional identity, distinguishing it from existing language learning market competitors.

## Managing Teams with Grok

Beyond language learning, Imoh manages his 25-person team at Hackmamba using a unique organizational structure. He implemented a Lord of the Rings-themed Grok Bot fellowship to assign roles and streamline operations. This creative use of AI agents helps him maintain productivity while operating as a solo founder of a company.

## Strategic Agent Integration

Imoh grants his AI agents access to data across 15 open tabs to assist with complex workflows. However, he maintains strict control by keeping specific sensitive tasks manual. This hybrid model balances the efficiency of automated agents with the necessary human oversight required for high-level decision-making and critical business operations.

## The Challenge of Dependency

While AI models have significantly improved, Imoh notes that certain tasks still require his direct intervention. His primary concern regarding AI integration is not the fear of being replaced by technology, but rather the growing dependency on these tools. He continues to refine his prompting strategies to maintain operational independence.

## Operational Efficiency Lessons

The project highlights how solo founders can leverage generative AI to perform tasks traditionally requiring large engineering teams. By combining tools like Codex, Cursor, and Notion, Imoh demonstrates a modern approach to startup building. His workflow emphasizes rapid iteration and the strategic use of AI to manage both product and people.

## Future of AI Development

Imoh's journey from chemical engineering to AI-driven app development underscores the shifting landscape for non-technical founders. As tools become more accessible, the barrier to entry for building complex software continues to drop. Success now depends on effective prompting, clear design vision, and the ability to manage AI-driven workflows efficiently.

## Sources covering this story

- https://www.lennysnewsletter.com/p/how-this-founder-built-a-better-duolingo — 

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_Summary written by Brifing from the original reporting. Copyright in the original article belongs to its publisher; read the full piece at the link above._