Freelancer profile translated to English.

Description

Launching a B2B SaaS and looking for a developer who can deliver everything alone?

Does your business back-office deserve better than a generic tool?

An API to design cleanly or to take over?

With a dual Spring Boot + NestJS profile, I design and evolve business applications, APIs, and B2B SaaS using Java/Spring Boot, NestJS/TypeScript, and React/Next.js. From MVP from scratch to taking over sensitive existing systems.

My background

• REBAZE — Current role, European media group (Spring Boot, hexagonal architecture, Next.js)

• Attijari Wafa Bank — Banking IT department, KYC, secure REST integrations

• Inetum — 2 years on X7, billing software for utilities (25M invoices/year, 3 continents)

• Sopra Banking — Regulatory reporting, Cloud migration

• PharmaFlex — Multi-tenant pharmacy B2B SaaS built alone. 80+ endpoints, PostgreSQL schema per tenant, 50+ business rules

Fullstack approach

Backend: Java 17+, Spring Boot, NestJS, TypeScript, REST APIs, JWT/OAuth2, PostgreSQL, Oracle, hexagonal architecture

Frontend: React, Next.js, Vue.js, TypeScript, business back-offices and workflows

Quality: Docker, Jenkins, GitLab CI/CD, Cypress, automated tests

Architecture: Multi-tenant, Stripe and external IT system integrations

Fixed-price services

✓ Design and development of custom B2B SaaS

✓ Business REST APIs and IT system / Stripe integrations

✓ Back-offices, dashboards, and internal tools

✓ Web MVP scoped by deliverable packages

✓ Technical audit and prioritized action plan

✓ Takeover and modernization of existing applications

✓ Integration of AI features (LLM API, RAG, automation) into existing products

Why work with me

✓ Dual Spring Boot + NestJS expertise.

✓ Proven experience in critical production environments (banking, healthcare, public media)

✓ Capable of delivering a complete product alone, from back-end to front-end

✓ Systematic documentation and best practices

Have a product idea or an application to take over?

Send me your context: I'll provide a quick scope.

Industry field of expertise

Languages

French
Native or bilingual
English
Native or bilingual
Arabic
Native or bilingual

Workplace preferences

Can work on-site

Paris (up to 50km), Lille (up to 50km), Nantes (up to 50km), Lyon (up to 50km), Bordeaux (up to 50km)

REBAZE
End client (European media and audiovisual group)
TECH
January 2026 - Today (5 months)
Paris, France
Context: assignment via REBAZE within a leading European media and audiovisual group — development and maintenance of critical business applications.
Intervention on critical business applications with Java Spring Boot backend development, Next.js interfaces, and strong functional logic. Work on a maintainable, testable, and structured foundation to facilitate evolution.
Streaming challenges on B2C and B2B solutions, SAML SSO, and Dashboards with optimized SQL queries.

- Java Spring Boot backend development in multi-modular hexagonal architecture: strict separation of domain/application/infrastructure, enhanced testability and maintainability.
- Next.js frontend development: business interfaces, API integration, server-side rendering.
- Collaboration with business and technical teams on applications with strong functional logic.

Stack: Java, Spring Boot, Next.js, TypeScript, Jenkins, hexagonal architecture, Maven multi-module.

Assignment completed via REBAZE (confidential client).
Next.js Jenkins Java Spring Boot Hexagonal Architecture Typescript
Attijariwafabank
Development & Studies Engineer — Java / Spring Boot / React (IT Department)
BANKING AND INSURANCE
October 2025 - January 2026 (3 months)
Paris, France
Context: data & compliance projects, internal tools in a banking environment.

Achievements:
Protectel integration via API: construction of XML requests and secure REST transmission via JWT.
Process optimization: transition from "line by line" to batch mode (single / small batch / large batches) to handle high volumes (tens of thousands).
Development of Spring Boot REST APIs and integration with existing IT systems / external APIs.
Development of React interfaces for internal workflows (forms, validations, processes).
Modernization of legacy modules: technical refactoring, debt reduction, reliability, and performance improvement.
Automation of data/regulatory processes via Python (reduction of manual operations).
Participation in delivery: technical documentation, standardization of practices, production deployment.

Stack: Java, Spring Boot, React, Oracle SQL/PLSQL, Python, Docker, REST API.
Python React.js Automation Java Spring Boot Oracle PL/SQL
INETUM SOFTWARE FRANCE
R&D Engineer — Full-Stack Node.js / Express + React / Next.js (X7 Software Package)
DIGITAL AND IT
September 2023 - September 2025 (2 years)
Paris, France
Context: business software for water/sanitation/billing + field applications.

Achievements
• Modernization of Node.js / Express backend: refactoring, stabilization of critical flows, business logic optimization.
• React / Next.js front-end development: dynamic components, UX improvement, API integration.
• Implementation of Cypress E2E tests (reduction of regressions without a QA team).
• Contribution to Jenkins CI/CD (build, tests, automated analyses).
• Collaboration with R&D to stabilize and rationalize historical technical foundation.

Stack: Node.js, Express, TypeScript, React, Next.js, Cypress, Jenkins, Docker, Oracle SQL.
Next.js Jenkins Docker Node.js PL/SQL