Justellia

About the Company

Le nouveau standard du contrôle de Comptes de Gestion (CRG) pour les Professionnels Qualifiés (PQ). Notre solution est née de la synergie unique entre une Experte de la Protection Judiciaire des Majeurs (PJM) et un Architecte Tech. Nous transformons la lourde charge de vérification en audit augmenté, vous garantissant à la fois : * L'Efficacité Opérationnelle nécessaire pour faire face au volume des contrôles des comptes rendus de gestion réalisés par les mandataires (qu'ils soient protecteurs familiaux ou professionnels (MJPMI, Association tutélaire ou Hospitalier) dans le cadre des mesures de protection dont ils ont la charge. * La Rigueur Judiciaire d'un contrôle de 100 points d'expertise pour sécuriser votre mandat et justifier pleinement votre intervention. Nous offrons aux Professionnels Qualifiés l'outil qui légitime leur expertise et maximise leur productivité à l'intérieur du cadre réglementé.

Listed Jobs

Company Name

Justellia

Job Title

Concepteur·rice & Développeur·se d'Application Fullstack (Alternant·e H/F/X)

Job Description

**Job Title** Full‑Stack Application Developer (Intern) **Role Summary** A six‑month internship focused on building and maintaining a legal‑tech application that protects vulnerable adults. The role involves front‑end and back‑end development, API design, and database management, with a strong emphasis on user experience and data security. **Expectations** - Deliver functional code that directly contributes to the product’s mission. - Work independently with minimal supervision while collaborating openly with the team. - Maintain high coding standards, including security best practices and efficient performance. - Balance learning and hands‑on contribution to a complex, high‑impact project. **Key Responsibilities** - Design, implement, and test intuitive user interfaces using React and Mantine UI. - Optimize front‑end performance and accessibility. - Build and maintain robust APIs with AdonisJS, Inertia, and PostgreSQL integration. - Manage sensitive data and ensure secure database queries. - Collaborate across the stack, bridging UI and server‑side logic. - Participate in code reviews and contribute to continuous improvement of development processes. - Apply Docker or Ansible practices if applicable to streamline deployment and environment consistency. **Required Skills** - Strong proficiency in JavaScript and TypeScript. - Experience with React and UI component libraries (e.g., Mantine, Material‑UI). - Familiarity with Node.js frameworks (AdonisJS or similar). - Knowledge of relational databases, preferably PostgreSQL. - Understanding of API design principles and RESTful architecture. - Awareness of cybersecurity fundamentals for handling sensitive data. - Comfortable using version control (Git). - Excellent problem‑solving ability, self‑motivation, and clear communication. **Required Education & Certifications** - Current enrollment in a bachelor’s (Bac+3) to master’s (Bac+5) program in Computer Science, Software Engineering, or a related field. - Equivalence to a French Ecole d’Ingénieur or program 42 accepted. - No mandatory certifications required, but relevant coursework in web development, database systems, and cybersecurity is favorable.

Pantin, France

Hybrid

25-11-2025