Freelancer profile translated to English.
Back to original languageAbout Alexandre
TypeScript Developer | NestJS Backend Specialist
I support you in your web projects by combining solid backend expertise with the ability to intervene across the entire stack.
👨🏻💻 My Profile
Fullstack Developer specializing in TypeScript. I have a strong backend orientation, with in-depth expertise in NestJS (REST or microservice).
I can also handle frontend functional development with Next.js, although I am happy to collaborate with a dedicated frontend developer to combine speed and performance.
✨ What I bring to your projects
- High-level Backend : design and development of REST APIs, microservices, data security.
- Modern Frontend : functional interfaces with Next.js, responsive and consistent.
- Pragmatic Product Approach : ability to quickly deliver an MVP while limiting technical debt.
- AI Integrated into the Process : reinforce my technical decisions and automate repetitive tasks (internal AI agents, code assistants...).
⚙️ Main Stack
- Backend : NestJS, Node.js, TypeScript, MongoDB, Redis...
- Frontend : Next.js, React, TailwindCSS, Headless UI...
- Architecture & DevOps : Docker, GitHub Actions, CI/CD, OpenAPI, DigitalOcean...
- Tools & AI : OpenAI, Claude Code, in-house AI agents, test automation, assisted documentation...
🚀 Typical Areas of Intervention
- Creating products from scratch
- Developing or redesigning web applications
- Integrating new features into existing backends
- Temporary reinforcement of backend or fullstack teams
🤝🏻 Why Choose Me?
- Experienced Fullstack developer with backend specialization
- Excellent algorithmic and logical rigor
- Ultra-responsive, available 7 days a week
- Reliable and autonomous
- Adaptable to your tools and processes
📩 Have a project to launch or a team to strengthen? Let's discuss.
Available now fully remote.
French
Native or bilingual
English
Fluent
Remote only
Primarily works remotely
Experience
- Authentify ItLead - Fullstack Developer - WebDIGITAL AND ITDecember 2022 - Today (3 years and 8 months)Angers, FranceTechnical lead for fullstack development, backend-oriented, within a B2B2C SaaS product integrating a blockchain component, with overall responsibility for technical design and MVP delivery, in direct liaison with the founders.Involvement in an ecosystem comprising:A B2C web applicationA B2B web applicationBack-office for managing platform data and workflowsTwo REST APIs developed with Node.js and NestJS (TypeScript)Main Responsibilities:- Design of the backend architecture and definition of technical choices in a startup MVP context.- Development and structuring of two APIs (B2C and B2B) with NestJS.- Implementation of business logic, data flows, and communication between the different platform components.- Participation in functional frontend development (Next.js / React) for B2B and back-office interfaces.- Integration of external services and infrastructures, notably Fireblocks (custody, security, asset management), Firebase, Klaviyo, Metaplex, Stripe, Twilio.- Implementation of blockchain functionalities (Solana, SPL tokens, NFTs, FTs) to support the product.- Reduction of technical debt, improvement of code quality and maintainability.- Use of AI tools and agents to assist in analysis, design, and productivity.- Direct collaboration with CEOs and business teams to align technical decisions with product goals.- Participation in the recruitment and occasional mentoring of developers (up to 6 people).Context: startup environment, strong time-to-market constraints, MVP construction, rapid iterations, and progressive improvement in quality and structure.
- CryptolottoLead - Fullstack Developer - WebTECHSeptember 2022 - November 2022 (2 months)Lille, FranceTechnical lead for fullstack development of a web product with blockchain functionalities, from design to production.Main Responsibilities:- Fullstack design and development of a web application with NestJS (backend) and Next.js (frontend)- Definition of the project's overall technical architecture (API, frontend, blockchain)- Development and deployment of smart contracts on Solana with Anchor (Rust)- Web3 integration (Web3.js) between the application and the blockchain- Implementation of business logic flows between the backend, frontend, and on-chain layer- Product delivery, evolving maintenance, and technical support- Participation in strategic product and technical decisionsContext: product-oriented project with a strong innovation component (Web3), involving a global view of the stack and an end-to-end approach, from smart contracts to the user interface.
- SonarWatchFullstack Developer - WebTECHJune 2022 - August 2022 (1 month)Paris, FranceDevelopment of a backend system for analyzing and indexing Solana blockchain transactions, focused on data and interoperability with major DeFi protocols.Main Responsibilities:- Design of a transaction parsing engine for numerous Solana protocols (Raydium, Orca, Jupiter, etc.).- Implementation of a "custom parsers" system (based on JSON objects) allowing quick addition of support for new protocols.- Development of helpers for decoding on-chain accounts (analysis of supply, calculation of token prices and liquidity pool tokens).- Creation of adapters for aggregating and displaying accounts delegated to different protocols.- Structuring the data layer for use by web applications and business tools.Context: blockchain and data engineering-oriented project, with a strong emphasis on backend reliability, maintainability, and scalability to support the rapid evolution of the DeFi ecosystem.
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Education
- Expert in Information System Study and DevelopmentIMIE Paris2021Expertise des compétences web en développant des projets avec un écosystème complet et gestion d'une équipe de 3 développeurs. Projet 1 - Webradio | Stream _________________________________ Projet ayant pour but de pouvoir écouter un grand nombre de radios et également avoir la possibilité de diffuser sa propre radio pour être écouté en direct. - Création des documents administratifs du projet (cahiers des charges, diagrammes etc..) - Site web avec Symfony 5 - Application mobile hybrid avec Ionic 5 et Angular 10 - API REST avec Node.JS et Express - Sécurité de l'API REST avec OAuth2 - Site de test des routes de l'API avec HTML5, CSS3 et AJAX - Intégration continue avec Heroku Projet 2 - Facture IT _________________________________ Projet de gestion clientèle pour un développeur freelance. - Création des documents administratifs du projet (cahiers des charges, diagrammes etc..) - Site web avec Angular 11 (SPA) - Application mobile hybrid avec Ionic 5 et Angular 11 - API REST avec Node.JS et Express - Sécurité de l'API REST avec JwT - Intégration continue avec Heroku - Versionning avec Bitbucket - Utilisation de Pipelines pour un déploiement automatique
- Computer Science Designer DeveloperIMIE Paris2019Conception de site web avec différents Frameworks : - Symfony 5 - SPA avec Angular Conception d'API REST avec Node.JS Bases de données MongoDB et MySQL Conception de plusieurs applications mobile hybrid avec Ionic 4 : Projet - Foxys Application de gestion de carte de fidélité Projet - Foxify Application type Spotify Projet TemoChat Application de messagerie instantanée