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Expert Next.js & Full-Stack Engineer
Hello, my name is Olivier. I have been coding for 20 years — first in C, as an aeronautics engineer, with a background in physics and signal processing. The web became my specialty 8 years ago: SEO and netlinking at first, then, for the past 5 years, SaaS products: AI, Web3, SEO tools and platforms. Today I work as an AI-augmented solopreneur: I design, build and ship end to end, at the pace of a small team. Former Web3 contributor on OnlyDust.
Next.js and React Specialist | Migration and development of high-performance web solutions with modern frameworks
Vibe coding is addictive.
- years of coding
- 20years of coding
- years on the web
- 8years on the web
- years on SaaS products
- 5years on SaaS products
- projects in production
- 15+projects in production
Selected projects
Portfolio Examples
From SaaS platforms to affiliate sites: a public selection out of more than 15 projects in production. Others are private or client work, and are not shown here.
“Stack” shows the technologies behind each project.
AI applications
03Products built around language and vision models.
AI image processing · Template
AI Upscale
AI image upscaling and sharpening. Deliberately pared back, it doubles as my template for spinning up other image-processing tools quickly.
Visit websiteai-upscale.fr
Crypto analytics · AI
Rocket Detector
A cryptocurrency scanner combining market data, AI scores and signal tracking over time.
Visit websiterocket-detector.vercel.app
Platforms
01Multi-user products with subscriptions and access management.
Telegram monetization
Unloqqq
A platform for monetizing Telegram groups and channels with subscriptions and automated access management.
Web3 MVPs
03Crypto prototypes shipped fast, from contract to dashboard.
Web3 · Gating & on-chain payment
WealthGate
Access to private Telegram communities gated by members’ verified crypto wallet value, with Ethereum smart contracts handling payment for paid groups.
Visit websitewealthgate.vercel.app
Crypto arbitrage · On-chain execution
OliveTrade
End-to-end crypto arbitrage: listening to DEX events over WebSocket, computing multi-hop routes across protocols and executing transactions on-chain, with a monitoring dashboard.
Visit websiteolivetrade.fun
DeFi · Portfolio tracking
DeFi Yield Copilot
Read-only yield tracking for a wallet: productive capital and idle tokens kept apart, comparing yields without ever signing a transaction.
Visit websiteyield-copilot-alpha.vercel.app
pSEO websites
02High-page-count sites, generated and tuned for search.
Affiliate marketing · Programmatic SEO
AIapp
An AI app directory and comparison website built around affiliate marketing and programmatic SEO (pSEO).
Visit websiteaiapp.fr
Directory · Local SEO
JumpArena
Directory of UK trampoline parks: around a hundred pages generated per location, activity and offer.
Visit websitejumparena.vercel.app
SEO tools
02Tools I build and use for my own search work.
Sitemap monitoring
SiteMapSpy
Automatic sitemap monitoring: detecting declared URLs and tracking how they change.
Visit websitesitemap-tau.vercel.app
Audience measurement
SiteAnalytics
Real-time traffic analysis across several sites, with a dashboard and Google sign-in.
Visit websiteanalytics2-iota.vercel.app
Expertise
Freelance Expert in Next.js & Python
Languages
- TypeScript
- Python
- Solidity
- C
- MATLAB
Infra & services
- Linux
- VPS (Hostinger)
- Vercel
- AWS S3
- Replicate
- Upstash
- Trigger.dev
- Clerk
01
Freelance Next.js Development
Migrations, team reinforcement and performance work on Next.js and React
02
AI agents & RAG
Tool-using agents, multi-model orchestration and vector search (RAG), with async jobs running in production
03
TypeScript Development
TypeScript for modular, robust, and high-performance projects
04
API Integration
Backend API<-> Frontend connection with modern standards
05
UX/UI & User Experience
Optimized design with A/B testing for a smooth user experience
06
Blockchain Development
EVM smart contracts (Solidity) & rPC, integrated with JavaScript
07
Global Solutions
Multilingual websites for global markets, with an advanced tech stack
08
Technical & editorial SEO
Programmatic SEO and server-side rendering, backed by Semrush, YourTextGuru and Majestic: audits, semantics, link profile
09
SaaS Architecture
Multi-Tenant solutions with NextAuth, Stripe, and high-performance technologies
10
MVP prototyping & deployment
Prototypes in 72 h, deployed and administered on a Linux VPS or a managed platform
Approach
My Mission
I work alongside product teams and founders, on Next.js applications already in production as well as on projects starting from scratch.
Next.js migrations, server-side rendering, performance and technical SEO, API integrations and automation. I work on a scope defined with you, with regular progress updates and code your team can pick up without me.
Availability
Service area: worldwide
Remote, across every time zone. Replies within 24 h on weekdays.
Rates
Day rate and fixed price
Day rate
€350 – €600/ day
Billed per day worked, adjusted to the nature of the work — €400 on average. A good fit to reinforce a team or for a scope that keeps moving.
Fixed price
On quote
An agreed deliverable for a firm price. Quote issued after an initial scoping call.
Excluding VAT. Hosting and third-party services billed separately.
Get in touch
Let's talk about your project
30 minutes to scope your needs, estimate the effort and spot the quick wins. No strings attached.