Adrien Devenyns

Design and development of a custom business CRM to structure and digitize Humiidi's commercial and operational activities (diagnosis, treatment, and monitoring of humidity problems in housing).

Functional and technical design of a web CRM from scratch

Development of the front-end in React for sales and operational teams

Development of a robust backend in NestJS / Node.js

PostgreSQL database modeling (clients, prospects, diagnoses, quotes, interventions, follow-ups)

Implementation of business workflows (statuses, reminders, history, sales pipeline)

User, role, and permission management

Document generation (quotes, reports, exports)

Implementation of secure REST APIs

Error handling, logging, and data validation

Continuous improvement of UX to encourage field adoption

Clear and scalable architecture based on NestJS

Strict separation of layers (controller, service, repository)

Strict typing with TypeScript

Maintainable and evolvable code

Access security (authentication, rights, JWT)

Unit tests on critical components

React, Node.js, NestJS, TypeScript, PostgreSQL, REST API, JWT, Docker

Centralization of all commercial and operational data, significant time savings, better visibility of activities, and improved quality of customer follow-up.

Design, development, and evolution of a complete digital platform dedicated to the express delivery of materials and consumables to construction sites, used daily by construction professionals in several major cities.

Scope:

Development of the web front-end in Next.js / React with a strong focus on performance, reliability, and UX

Implementation of a GraphQL architecture with Apollo for optimized data management

Development of Node.js APIs for business logic and workflow orchestration

Development of the multi-platform mobile application in Flutter

Deployment of a PWA to offer a native-like experience without installation friction

Database management via Clavus Former (no-code) interfaced with the backend

Implementation of asynchronous workflows for managing orders, notifications, and business events

Use of RabbitMQ for inter-service communication and reliable processing

Platform deployment and scalability via Docker & Kubernetes

Monitoring of platform stability, performance, and load capacity

Architecture & Quality:

Scalability and high availability oriented architecture

Clear separation of responsibilities (front, mobile, backend, messaging)

Fine-grained error handling, retries, and data consistency

Progressive approach between no-code solutions and custom development

Product and technical vision aligned with field needs

Stack:

Next.js, React, Apollo, GraphQL, Node.js, Flutter, PWA, Docker, Kubernetes, RabbitMQ

Result:

Platform deployed in several French cities, adopted by hundreds of users, with deliveries made in 1-2 hours and an infrastructure capable of scaling rapidly.

Design and development of a custom business web tool to structure the commercial and operational activities of JV-Concept, leveraging both modern development and the migration of existing .NET / C# applications.

Scope:

Analysis and migration of existing .NET (C#) applications

Refactoring and evolution of existing modules

Development of a custom web CRM adapted to the company's specific needs

React interface for managing prospects, clients, and commercial opportunities

Node.js API for new services and business rules

Coexistence and interoperability between Node.js backend and .NET services

Implementation of commercial workflows (statuses, reminders, action history)

User, role, and permission management

Centralization and reliability of business data

Data generation and export (tables, CSV exports)

Improvement of UX to encourage adoption by field teams

Architecture & Quality:

Mastery of hybrid architecture (.NET existing + new Node.js services)

Clear front/back separation

Modular, maintainable, and evolvable code

Data validation, error handling, and logs

Access security (authentication, user rights)

Tests on critical functionalities

Stack:

React, Node.js, TypeScript, .NET / C#, PostgreSQL, REST API, JWT, Docker

Result:

Progressive modernization of the existing system, operational time savings, improved data reliability, and rapid adoption by teams.