Business impact. Technical excellence.
Fullstack Developer Freelance.
Tancrède Simonin.
Tancrède supported us very well throughout the development of a backend for our application. He understood our business challenges and adapted by providing a solution tailored to our needs. He has a good ability to make his technical expertise simple, making it easily understandable. I highly recommend him.
Valentin Mercier
Founder@Tastyn - Product@Cardino
Tancrède stands out for his team spirit. Open and communicative, he facilitates the sharing of ideas and contributes to a positive work environment. Despite working remotely for 8 months, he managed to establish a closeness that strengthened team cohesion. On a human level, Tancrède is an extremely pleasant person and always available to discuss a problem or share a friendly moment. He is one of those who prioritize 'we' over 'I', and that makes all the difference. His backend expertise allowed us to understand the challenges as well as the blockers we could encounter during the development of a SaaS as complex as Roger.
Thomas Checkaiban
Advisor & Coach - Founder
Tancrède carried out his mission with seriousness and efficiency, he created for us an API and an admin dashboard to manage our transactions with connected fridges. He was able to develop and deploy the app which works very well. I highly recommend him.
Richard Beausse
Key Account Manager Supply
Being Tancrède's partner has surely been the most beautiful experience I've had the chance to live. We went through defeats and victories together, in absolute trust, and in perfect symbiosis to advance the project we were carrying. Beyond his listening ability and composure, what impressed me the most was his learning speed in all areas due to his limitless curiosity! Thank you again for this fantastic adventure, and looking forward to teaming up with you again!
Paul Weill
Founder
3 plans that fit your budget.
⚡️Response to contact email guaranteed within 48h.
🔐Confidential exchanges. NDA possibility when you wish.
📆Few slots available – I limit accompaniments to stay focused.
Who I work with?
CTO / Tech Team
You're looking for a hands-on partner to integrate into your team, or a technical advisor.
I work with your team in-house, integration or replacement.
Agencies
You want to develop your service offerings.
Transform your web agency from service provider to strategic digital partner, by offering new services to your clients.
Non-tech Founder
You're launching a startup but you don't have the tech skills.
I launch your project for you and support you until you have your own team.
Services
B2B SaaS
From A to Z. User flow, technical architecture, robust back-end, ergonomic front-end, guaranteed security and scalability.
API
REST API, GraphQL, Webhooks, WebSockets, authentication, documentation and SDK.
Web Platform
Authentication, content management, dashboards, payment system, user management... I code everything, cleanly.
AI Application
Text or image generation, recommendation engine, classification, automatic analysis...
Business Software
Inventory management, orders, customers, invoices, deliveries...
AI Agents
Orchestration of agents integrated into your systems to automate your tasks.
FAQ
Do you accept long-term missions (6+ months)?
Yes, depending on my availability. During our initial discussion, I'll confirm whether it's possible based on my schedule. If I accept your long-term mission, you benefit from dedicated priority throughout the entire project duration.
Do you provide technical documentation and post-delivery support?
Yes, systematically. I provide complete user documentation as well as technical documentation for modifying and evolving the code. Upon request, I can also provide training and support for your teams after delivery.
Do you work only remotely or also on-site?
I work primarily remotely, but I can travel on-site for important occasions: strategic project scoping, critical milestone deliveries, or team training. Travel expenses and mobilization time are billed separately. You can find all details on the Where I Work page.
How does payment work?
For short missions:
- 50% deposit upon signing
- 50% upon final delivery
For missions of 1 month or more:
- €2,000 deposit upon signing
- The rest spread across intermediate deliverables
This approach guarantees regular follow-up and concrete deliverables throughout the project, while protecting me against bad payers.
How often do you communicate during the project?
I adapt to your communication needs. As a general rule, I provide written progress updates every 2-3 days, aligned with my deliverables. For critical projects, we can establish daily communication if necessary.
What are your preferred technologies?
My preferred technologies are:
Backend: TypeScript, Node.js, NestJS
CMS: Strapi
Frontend: React, Next.js
Database: PostgreSQL, Redis
Cloud : OVH, Coolify (self-hosting), Scalingo (PaaS), AWS, GCP, Azure
Automation: n8n
The choice of technologies is always made based on your specific needs and constraints. I tend to favor robust technologies with the least vendor lock-in possible, with also a focus on security and GDPR. For these reasons I generally avoid American cloud providers. But everything is decided according to your needs.