Sam Yost
AI engineer +
app builder
I'm an AI engineer at Unbound AI. In my free time I build mobile apps and SaaS, and market them on TikTok with organic videos and paid ads. I share my progress on X.
On X
Follow me on X
I post about my apps: revenue, ad spend, and what worked and what didn't.
Sam@samuel_yostt · Sep 23, 2026I created a skill that creates animated 3d icons from a single prompt The results are crazy good🤯 Excited to see what you guys make with it🔥 github.com/samyost1/3dicon
- Sam@samuel_yostt · Sep 21, 2026
Animated 3d icon made with only one Claude prompt🤯 "use /animated-3d-icon to make an animated 3d fire" Will share the skill soon for free
- Sam@samuel_yostt · Oct 1, 2026
Opus 5.5 is crazy good for marketing🤯 It made this video for me with just a simple prompt
- Sam@samuel_yostt · Sep 22, 2026
Will release the "animated 3d icon" skill tomorrow📣📣📣
- Sam@samuel_yostt · Sep 29, 2026
I've tested 4 different prices for my app The absolute GOAT is👇 $44.99 / year $7.99 / week
- Sam@samuel_yostt · Sep 5, 2026
$702 revenue from 305 customers That seems pretty good right?🤔
- Sam@samuel_yostt · Jul 21, 2026
Day 5 of trying out TikTok ads for my new mobile app🔥 Amazing numbers for my first ad set today🤯 44 installs for $22.60 ⬇️ $0.51 per install All with AI videos
- Sam@samuel_yostt · Oct 2, 2026
Here's the prompt for the video. Try it out yourself with opus 5.5 max effort "make a dynamic 15-second motion graphics video that shows what an incredible motion designer you are, like it's your showreel for a resume. go all out. This video will be same styling as landing page.
- Sam@samuel_yostt · Aug 19, 2026
Paid ads are doing pretty well recently Going on holiday for 10 days this weekend $1K revenue when I'm back?? 👀
- Sam@samuel_yostt · Oct 6, 2026
Update: No difference in amount of views But huge difference in audience location (With VPN vs without VPN)
- Sam@samuel_yostt · Sep 12, 2026
Tiktok ads campaign optimized to trial starts day 3 Hopefully it starts optimizing more🤔 The cost per conversion is very high right now. Any advice?
- Sam@samuel_yostt · Sep 28, 2026
1000 followers🔥🔥 Love sharing what I build on here, and glad to learn from others as well Insane how much free knowledge is on this platform
- Sam@samuel_yostt · Oct 8, 2026
First time experimenting with SEO for viralgrow.ai Seems to be working pretty well actually The blog is starting to index on google
Work
My projects
ViralGrowLet AI influencersmarket your app
Paste your app's link. In 2 minutes, your AI influencer has a week of TikToks, Reels and Shorts planned.
Posts to TikTok, Reels & ShortsYou never film or edit anything
Project
I have this iOS app live in the App Store. I'm keeping the name private for now. Right now I'm scaling it with organic TikTok marketing and TikTok ads.
How I'm growing it- Organic TikTok
AI creator videos posted every day with ViralGrow.
- TikTok ads
Campaigns optimized for purchases. Installs from $0.51.
- Sam@samuel_yostt · Sep 6, 2026
This paywall has been crushing it🔥 18.6% conversion to paying on average
Hireshot
React Native • Cloud AITurn a selfie into a professional headshot in under 30 seconds.
App Store
Google Play
RapidSubs
React Native • Local MLAI subtitles for TikTok, Reels and Shorts. Runs fully on your phone, so it works offline.
App Store
Google Play
AppBoost
Expo • React NativeA React Native starter kit. One AI command sets up the basics every app needs:
Experience
Where I've worked.
Education
- Sep 2025 – Present
AI Engineer · Unbound AI
Rotterdam, NL · Full-time- Built agentic AI automation for order processing with LangChain, the Claude Agent SDK and RAG.
- Developed an AI system that compares and analyzes documents.
- Set up and run the AWS infrastructure with Terraform: deployment, containers, monitoring, security and CI/CD.
- Built a secure environment that runs LLMs on our own EU servers, so sensitive data never leaves the infrastructure.
LangChainClaude Agent SDKRAGAWSTerraform - Jan 2024 – Present
Solo developer, AI apps & SaaS · Independent
Remote- Built and launched five AI products on my own, mobile apps and SaaS, with paying subscribers.
- I host the backend myself with Docker on my own servers, and automate ASO and marketing with LLM agents.
- I do everything myself: product, code, pricing and marketing.
React NativeExpoDockerRevenueCat - Feb 2025 – Jul 2025
Graduation internship, AI for predictive maintenance · Rijkswaterstaat
Stellendam / Delft, NL- Designed and deployed a predictive-maintenance system for nautical radars on real sensor data.
- Microservices with Docker and PostgreSQL on a Raspberry Pi; ML models trained on weather and operational data.
PythonMLPostgreSQLDocker - Sep 2023 – Dec 2024
Software Engineer · Market Control
Barcelona / Remote · 1 yr part-time + 6 mo internship- Built a Vehicle Routing Problem algorithm with Python and Neo4j: compute time from 20 minutes to 30 seconds, removing a costly external API.
- Developed machine-learning models for shelf and product recognition in supermarkets.
- Optimized the CI/CD and Docker infrastructure.
PythonNeo4jComputer vision