Senior fullstack developer
I combine technical depth with product thinking to design solid applications with method and clarity, from the idea to production.
Free · No commitment
A senior developer who understands the need before writing code
My background lets me step in as a genuine technical partner. I take in the context, ask the right questions, spot the risks and bring proposals to the table.
Autonomy
You can hand me an objective, an existing product or a scope to build. I turn the vague into concrete next steps, fast.
Experience
My job isn't to validate every idea. I'll suggest a simpler option, flag a risk, or put a technical decision back in perspective.
Outcome
A finished feature isn't the goal. The goal is a product that's usable, maintainable and solid enough to keep evolving.
From senior reinforcement to building from scratch.
I can join an existing team, take on a complete product, or bring a technical perspective to a design phase. The level of involvement adapts to the project.
Senior fullstack development
Implementing complex features, building web applications, SaaS products, back-offices and solid APIs.
Clean, maintainable code, delivered on time.
Building from scratch (MVP to production)
Designing and developing a complete product, from the initial idea to a secure production launch.
Fast time to market without critical technical debt.
Architecture & technical choices
Code audit, stack selection, data modelling and support on structural decisions.
Technical foundations proportionate to your actual needs.
Taking over & evolving existing code
Getting up to speed quickly on an existing codebase, resolving critical issues and building new features.
Service continuity and faster delivery.
Not sure where to start? Let's talk it through.
A path shaped by execution and entrepreneurship
CTO experience reinforcing hands-on developer expertise — a dual perspective made for your web projects.
Today
Independent / Jinious
Supporting startups, SMEs and product teams on tailored fullstack development, web architecture and building applications from scratch.
6 years
CTO & Co-founder - Beauty-Tech startup
Technical leadership and development of a full ecosystem: a high-traffic social mobile app, cloud infrastructure, back-office and APIs. Daily trade-offs between delivery speed, technical quality and product vision.
15+ years
Senior Web & Fullstack Developer
Designing and shipping multiple web applications and complex platforms. Continuously evolving with the best practices of the modern web ecosystem (React, Next.js, TypeScript, Node.js).
Real products, problems solved
Fullstack development, technical choices and architecture decisions, from the first line of code to production.
Marketing site
Immersion
Full rebuild of the website of an organiser of immersion stays abroad, delivered in three days: SEO audit, redesign, self-hosted tracking and analytics. In progress: a case-management SaaS that automates validity and consistency checks on supporting documents. OCR and LLM document extraction pipeline already in production.
- Site rebuilt and delivered in 3 days
- Next.js
- Tailwind CSS
- Cursor
- Vercel
- Claude
Real estate
SaaS rental platforms
Designed and shipped three rental matchmaking platforms for a real-estate software vendor. Sole technical owner for three and a half years, from architecture to deployment. Automatic catalogue sync from the Ubiflow gateway and recurring billing with Stripe.
- 50k+ applications processed
- 850+ listings synced from Ubiflow
- Next.js
- Tailwind CSS
- NestJS
- Prisma
- PostgreSQL
- Stripe
- Vercel
- DigitalOcean
Co-founder & CTO · 6 years
My Beauty Community
Community mobile app dedicated to beauty product reviews, co-founded and led technically for six years. Architecture from scratch, user matching algorithm, hiring and managing the tech team. MVP delivered in six months.
- 100k+ users
- 4.6/5 on the stores
- MVP launched in 6 months
- 6 years as technical lead
- Flutter
- Node.js
- Express.js
- React
- Next.js
- MongoDB
- ElasticSearch
- AWS
- App Store
- Google Play
Collaborations that make the difference
“David understood our needs quickly and delivered a site that genuinely looks like us, within impressive timelines. He worked with rare involvement, as if the project were his own.”
Mathilde Effray-Buhl
Director and co-founder · IMMERSION
Hi, I'm David
I've been developing since 2010. I co-founded a startup and built its mobile app, from zero to 100,000 users. I made bad architecture calls along the way, and learned not to repeat them.
Today I build SaaS products end to end for startups, SMEs and software companies: design, development, production launch, operations. On my last long engagement I was the sole technical owner of three platforms for three and a half years, from idea to deployment.
I also build my own products, because it's the best ground to test what I sell. And I share what I learn on my blog davidmoothen.com.
I work remotely from Paris, with hybrid possible across the Île-de-France region.
What you get with me: someone who takes a subject and carries it through to production without needing to be managed, who says what he thinks before coding rather than after, and who is there to make it work.
Shall we talk about your project?
Have an idea, a product to evolve, or a technical problem to solve?
No need for a perfect brief. Just tell me where you are, what you're trying to build, or what's blocking you.
Free, no commitment, reply within 48h