Freelancer profile translated to English.
Back to original languageAbout Constantin
Hello 👋,
I am aSenior Developer & Software Architectwith over 9 years of experience.
Former Tech Lead at Orange and co-founder of two startups (SaaS Fintech & PropTech), I bring a global vision to your projects: I don't just deliver code, I deliver a robust, secure, and scalable product.
💡 Why work with me?
Beyond technical expertise, I integrate AI (Claude, Mistral) into my development workflow. This allows me to:
- 🚀 Code faster : Drastic reduction of repetitive tasks to focus on your complex business logic.
- 🛡️ Make code reliable : Generation of exhaustive unit tests and assisted code reviews.
- ⚡ Deliver quickly : Shorter iterations to validate your features earlier.
💼 What I can do for you:
1. Creation of SaaS & Complex Applications (From A to Z)
Have an idea? I'll take care of everything, from architecture design to deployment.
- Solid stack: Ruby on Rails (Modern Rails/Hotwire Expertise) or Python (FastAPI/Django).
- Responsive front-end: Vue.js / Nuxt if API/Front separation is needed.
Examples: Marketplaces, Business Tools, Fintech platforms.
2. Code Takeover & Scaling (Legacy)
Is your application slow or difficult to maintain?
- Technical audit and refactoring.
- Version upgrades (Rails / Python).
- Performance optimization (Database, Caching, Background jobs).
3. DevOps & Serenity (Build & Run)
I am a follower of the "You build it, you run it" philosophy.
- CI/CD implementation (GitLab, GitHub Actions).
- Infrastructure as Code (Docker, Ansible, Terraform).
- Sovereign or Cloud hosting (Heroku, Scalingo, AWS, GCP).
🎯 My approach: Partner, not just an executor.
Having managed companies myself, I understand your budget and deadline constraints.
French
Native or bilingual
English
Fluent
Remote only
Primarily works remotely
Experience
- ImmoDuoFull Stack Developer • FounderREAL ESTATEJune 2025 - Today (1 year)Toulouse, FranceEnd-to-end development of an AI-enhanced PropTech SaaS.
- AI-assisted workflow: Use of Claude Design for UI/UX prototyping and Claude Code for development and refactoring support to optimize production time.
- Integrated AI features: Implementation of a conversational agent, real estate data analysis via web scraping, and automation of a content pipeline for acquisition.
- Full Stack Development: Architecture based on Ruby on Rails 7+ with a responsive frontend managed via Hotwire (Turbo & Stimulus). Implemented as a Progressive Web App (PWA) for mobile support.
- Infrastructure & Deployment: Self-hosting on a dedicated server. Configuration of "zero downtime" deployments with Kamal and traffic management via Cloudflare.
- EstalyFull Stack DeveloperBANKING AND INSURANCEJuly 2024 - June 2025 (11 months)Paris, France✅ Active participation in the design and development of features✅ Technical mentoring✅ Maintaining the operational status of the application✅ Close collaboration with the product team✅ Continuous improvement of development processesThis experience allowed me to improve my communication skills and consolidate my technical expertise.
- KamatzFull Stack DeveloperTECHNovember 2021 - July 2024 (2 years and 8 months)Paris, FranceDeveloper at theKamatzstartup (HR Tech), integrated into a squad of 6 experienced developers inFull Remote (100% remote work).
- Back-end : Architecture and development of new features under Ruby on Rails.
- Front-end : Integration of modern and responsive interfaces from Figma mockups.
- Methodology : Agile Scrum rituals (then Kanban) and effective remote collaboration (Code Reviews, Dailies, Ticketing).
- Ops/MCO : Participation in the maintenance and stability of the platform in production.
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Education
- Engineer, specialization in networks and telecommunicationsTélécom Physique Strasbourg2018Major de Promotion. Programmation C, JAVA, protocols et administration réseaux & IoT
- Master's degree, specialization in networks and embedded systemsUniversity of Strasbourg2018Compilation, Electronique, Calcul distribué et Administration systèmes.
Certifications
- AWS CLOUD PRACTITIONERAWS
- CERTIFIED KUBERNETES APPLICATION DEVELOPERLinux Foundation