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Mustapha GANGAMG

Mustapha GANGA

Senior Full-Stack Engineer — Cloud & AI-Driven

€650/day
Marseille, FR
15+ years

Average response time: 1 hour

Freelancer profile translated to English.
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About Mustapha

I design and deliver complete web applications, from front-end to cloud deployment — whether you're looking to entrust a project from A to Z or to strengthen an existing team on a specific topic.
Concretely, I can help you to: launch a product from scratch (SaaS, business platform), take over and stabilize a codebase with technical debt, design a scalable microservices architecture, or integrate AI into your workflows and your delivery.
What sets me apart: 15+ years of full-stack experience (React/Next.js, Node.js, TypeScript, AWS) combined with advanced practice in AI-assisted development (Claude Code, Cursor — custom agents, skills, and quality hooks). I deliver faster without sacrificing quality: clean architecture, automated tests (Playwright, Vitest), systematic reviews.
Accustomed to demanding environments — large corporations, regulated sectors, strong security and quality constraints (Sanofi, Nielsen, European Patent Office).
Type of missions: time and materials or fixed price, independently or integrated into your team. Typical deliverables: MVP delivered in production, documented service or API, architecture redesign, CI/CD pipeline, AI POC integrated into your product.
  • French

    Native or bilingual

  • English

    Fluent

  • Arabic

    Native or bilingual

Can work on-site
Marseille (up to 50km), Paris (up to 50km)

Experience

  • Sanofi
    Senior Full-Stack Engineer
    January 2026 - Today (7 months)
    • ● Engineer on Clinshow — a centralized clinical-trials monitoring and data-review platform supporting data cleaning and medical case analysis (CDISC-aligned), in a serverless microservice monorepo within a regulated GxP environment.
    • ● Leading the development of the Data Prediction module: designed and delivered the Signals Export service end-to-end — an event-driven, idempotent pipeline exporting client-format CSV of AI-detected clinical signals to medical teams, with ADR-documented architecture and a site-level → study-level data-model migration.
    • ● Leading the development of the Data Validation module: rule-based anomaly detection on patient data, from Snowflake SQL queries through validated APIs to the Rule Detail UI, including affected-subjects analysis.
    • ● AI-driven development: advanced use of the team's Claude Code workflow (custom skills, PR and ADR agents, convention-validation hooks, MCP-server integration) to accelerate delivery while sustaining quality.
    • ● Contributed to the authorization redesign (RBAC → capability-based ABAC): reusable permission middlewares, deny-by-default access checks and route guards, rolled out progressively under feature flags.
    ◦ ● Cloud security: least-privilege IAM, customer-managed
    encryption keys, VPC-isolated functions, EntraID/MSAL SSO with AD-group gating, and supply-chain hardening.
    • ● Cross-team collaboration: translated clinical needs from POs (FR) and Central Monitoring data scientists (CN) into technical pipelines, aligning with Platform, Data/Snowflake, Design System and SecOps teams.
    • ● Engineering practices: drove team-wide initiatives (ADRs, technical documentation, pre-commit hooks, CLI tooling) through the Tech Continuous Improvement practice. GitHub
  • Kleap.co – AI-Powered Website Builder SaaS
    Senior Full-Stack Developer
    April 2025 - September 2025 (5 months)
    • ● Evolutive and corrective maintenance across the full Kleap platform (Dashboard, Analytics, Templates, Pages, Collections).
    • ● Built a multi-workspace onboarding system with automated provisioning.
    • ● Designed and implemented an e-commerce module: product / order / customer management with Stripe payment integration.
    • ● Integrated AI into business workflows: developed Kleap Agent (OpenAI GPT-4) to automate content generation, smart suggestions and website-creation assistance.
    • ● Results: scalable e-commerce system, improved onboarding, and a platform enriched with AI features.
  • Solypse – Engineering Agency
    Lead Full-Stack Developer
    February 2024 - May 2025 (1 year and 3 months)
    • ● Corrective and evolutive maintenance of the ERP: incident handling, bug fixing and feature development for quotes, invoicing and budget tracking.
    • ● Designed and implemented an Angular Design System with Storybook to centralize and harmonize styles/components across applications.
    • ● Technical audit of the existing codebase and project scoping with the PO: technical-debt analysis, requirement gathering and prioritization, effort estimation and architecture proposals.
    • ● Designed and built integration connectors with third-party ERP systems and bidirectional data synchronization, ensuring integrity and consistency of business flows.
    • ● Upgraded the front-end and back-end stack to LTS versions: dependency management, incompatibility fixes and code adaptation for long-term maintainability.
    • ● Results: unified visual consistency across apps, reduced front-end technical debt, improved performance and stability, -30% UI development time.

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Education

  • Classes Préparatoire (CPGE) , option MP
    Lycée Réda Slaoui, Agadir
    2001
  • Baccalauréat Science Mathématique
    Lycée Mohamed V
    1999

Skill set

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