Keynote: going from idea to working demo in an afternoon · Notes

The short version

Kiran built a working demo live on stage in 25 minutes, then took it apart to show where the time really goes. His advice for today: pick the one moment the judges should see, and fake everything around it.

4 takeaways

Key takeaways

01Write the demo script first, then build only what the script touches.
02Let AI coding tools do the boring 80%, and spend your own time on the one moment that has to feel real.
03Hard-code the happy path. Judges forgive fake data, they don't forgive a spinner.
04Stop building at 4:15. The last 45 minutes are for rehearsing and recording a backup video.

5 chapters

Chapters

Timed to the recording. Tap a time to link to it.Read each chapter in full

0:00
The plan for today
Four hours, one demo, a few minutes on stage. Work backwards from those minutes.
4:30
Script first
Write the 90-second story before you open an editor. Anything not in the script doesn't get built.
10:00
Live build
A working prototype in 25 minutes with an AI coding tool, narrated as it went.
22:15
Where the time went
Most of it went on one interaction. The rest was generated, stubbed or hard-coded.
28:40
The last hour
Freeze at 4:15, rehearse twice, record a backup video, charge your laptop.

3 quotes

Worth quoting

Your demo is a story with one twist. Build the twist. Fake the rest.
Kiran DesaiPrincipal Engineer, Initech3:10 in the transcript
I let the agent write the whole settings page. I've never read it and I never will.
Kiran DesaiPrincipal Engineer, Initech18:45 in the transcript
Stop coding at quarter past four. Every team that ships at 4:59 demos a bug.
Kiran DesaiPrincipal Engineer, Initech31:20 in the transcript

Transcript excerpt

From the transcript

An excerpt, lightly cleaned up. Speakers were matched by voice, then checked by a person.

2:30Kiran Desai
Here's the thing nobody tells you about hackathon demos. The judges see three minutes. You spend four hours. So most of what you build, nobody sees.
3:10Kiran Desai
Your demo is a story with one twist. Build the twist. Fake the rest.
18:20Kiran Desai
Okay, so it's working. Let me show you what I didn't build.
18:45Kiran Desai
I let the agent write the whole settings page. I've never read it and I never will.
19:02Audience
Isn't that risky?
19:08Kiran Desai
For a demo? No. For production, absolutely. Know which one you're building today.
31:20Kiran Desai
Stop coding at quarter past four. Every team that ships at 4:59 demos a bug.

The short version

4 takeaways

Key takeaways

01Write the demo script first, then build only what the script touches.
02Let AI coding tools do the boring 80%, and spend your own time on the one moment that has to feel real.
03Hard-code the happy path. Judges forgive fake data, they don't forgive a spinner.
04Stop building at 4:15. The last 45 minutes are for rehearsing and recording a backup video.

5 chapters

Chapters

Timed to the recording. Tap a time to link to it.Read each chapter in full

0:00
The plan for today
Four hours, one demo, a few minutes on stage. Work backwards from those minutes.
4:30
Script first
Write the 90-second story before you open an editor. Anything not in the script doesn't get built.
10:00
Live build
A working prototype in 25 minutes with an AI coding tool, narrated as it went.
22:15
Where the time went
Most of it went on one interaction. The rest was generated, stubbed or hard-coded.
28:40
The last hour
Freeze at 4:15, rehearse twice, record a backup video, charge your laptop.

3 quotes

Worth quoting

Your demo is a story with one twist. Build the twist. Fake the rest.
Kiran DesaiPrincipal Engineer, Initech3:10 in the transcript
I let the agent write the whole settings page. I've never read it and I never will.
Kiran DesaiPrincipal Engineer, Initech18:45 in the transcript
Stop coding at quarter past four. Every team that ships at 4:59 demos a bug.
Kiran DesaiPrincipal Engineer, Initech31:20 in the transcript

Transcript excerpt

From the transcript

An excerpt, lightly cleaned up. Speakers were matched by voice, then checked by a person.

2:30Kiran Desai
Here's the thing nobody tells you about hackathon demos. The judges see three minutes. You spend four hours. So most of what you build, nobody sees.
3:10Kiran Desai
Your demo is a story with one twist. Build the twist. Fake the rest.
18:20Kiran Desai
Okay, so it's working. Let me show you what I didn't build.
18:45Kiran Desai
I let the agent write the whole settings page. I've never read it and I never will.
19:02Audience
Isn't that risky?
19:08Kiran Desai
For a demo? No. For production, absolutely. Know which one you're building today.
31:20Kiran Desai
Stop coding at quarter past four. Every team that ships at 4:59 demos a bug.

Key takeaways

Chapters

The plan for today

Script first

Live build

Where the time went

The last hour

Worth quoting

From the transcript

Key takeaways

Chapters

The plan for today

Script first

Live build

Where the time went

The last hour

Worth quoting

From the transcript