Kevin Rousseau
Full-stack engineer, SaaS founder, and AI builder based in France.
KR

About

I’m a full-stack engineer, SaaS founder, and AI builder based in France. I lead engineering at Copyfy.io and build VoiceCheap, an AI platform for video translation, dubbing, voice cloning, subtitles, and lip-sync. I also share my journey around SaaS, AI, coding, and entrepreneurship on my French YouTube channel.

Building Now

My current work is split between VoiceCheap, VoiceCheapStudio, and leading product engineering at Copyfy.io.

VoiceCheap.aiVoiceCheap.ai logo

Founder & CEO

VoiceCheap.ai

Self-serve AI video localization platform for creators and businesses: translate, dub, clone voices, generate subtitles, add lip-sync, and publish videos in 70+ languages.

Next.js
TypeScript
AI dubbing
FFmpeg
AWS
VoiceCheapStudioVoiceCheapStudio logo

Founder

VoiceCheapStudio

Fully managed AI video dubbing studio. Clients send a video; the studio handles transcription, voice cloning, lip-sync, subtitles, QA, and multilingual delivery.

AI localization
Voice cloning
Lip-sync
QA
Copyfy.io logo

Lead Full-Stack Engineer

Copyfy.io

Lead developer on Copyfy.io, building production TypeScript systems, applied AI workflows, RAG features, and the product architecture behind the platform.

Next.js
TypeScript
RAG
AI engineering

Work Experience

Skills

Frontend

HTMLCSSSCSSTailwind CSSJavaScriptTypeScriptReactJSNextJSReduxViteZustandCypressRemotion

Backend

NodeJSExpressNestJSBunPythonSQLAmplifyFFMPEGRust

Database

FirebaseMongoDBMySQLDynamoDBSupabase

DevOps

DockerGcloudAzure DevOpsVercelAWS
Projects

SaaS products and AI tools

A mix of founder-led products, AI media tools, and practical interfaces built around distribution, automation, and speed.

VoiceCheap

AI video translation and dubbing platform for creators, educators, agencies, and international businesses. VoiceCheap combines translation, voice cloning, subtitles, lip-sync, and publishing workflows.

Next.js
TypeScript
AI dubbing
Voice cloning
Lip-sync
FFmpeg

MagicCuts

AI product that transforms long-form content into short vertical clips for TikTok, Reels, and YouTube Shorts. The open-source build came from a public 12-hour YouTube challenge.

Remix
TypeScript
Hono
OpenAI
FFmpeg

Framedeck

AI-first video editor that turns raw footage into finished videos in minutes. Built around an editor interface, assets, timeline control, and an AI assistant for video production.

Next.js
TypeScript
AI video
Editing UX

SilenceCut

Video editing SaaS that detects and removes silent moments from videos, helping creators reduce manual editing time and keep content moving faster.

Next.js
Video processing
Automation
FFmpeg

MyStartupIdea.io

AI-powered startup idea and validation product that generates personalized, investor-grade startup opportunities backed by market research and execution guidance.

AI research
Market data
PDF reports
SaaS

Easy Benchmarks

A compact analysis surface for comparing current LLMs by benchmark scores, latency, output speed, pricing, and model tradeoffs using Artificial Analysis data.

Next.js
LLM data
Benchmarks
Dashboards
Open Source

Public builds with real product DNA

These projects show how I think: ship the product, explain the system, then make the useful parts open enough for other builders to learn from.

dubbing-engine

The TypeScript/Bun engine behind VoiceCheap: automatic language detection, contextual translation, voice cloning, background audio separation, SmartSync timing, subtitles, and lip synchronization. The launch post reached 439 LinkedIn reactions.

TypeScript
Bun
OpenAI
ElevenLabs
FFmpeg
SmartSync
Lip-sync

magicCuts

Open-source AI app that turns long videos into short-form clips. Built publicly with Remix, Hono, Deepgram, OpenAI, FFmpeg, S3, Supabase, and Vercel/Railway deployment.

Remix
TypeScript
Hono
OpenAI
Deepgram
FFmpeg
Supabase

Content & Distribution

I care about building in public: content is how I test ideas, explain what I learn, and create leverage for the products I build.

I created four YouTube channels that failed before the current one. The lesson stuck: I love creating, testing formats, and turning the founder journey into content people can learn from.

Contact

Let's build something useful

I'm especially interested in AI products, SaaS systems, media automation, and founder-led engineering. Send a focused message on X or LinkedIn.

GitHub
LinkedIn
X
youtube