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Dan AyaschDA

Dan Ayasch

FullStack Web Developer | Node.Js | React.Js

€650/day
Paris, FR
8-15 years
React.js
Node.js
API
NestJs
Backend Development

Average response time: 1 hour

Freelancer profile translated to English.
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About Dan

Fullstack Developer Node.js | React | React Native | AWS

Is your application reaching its limits or needs to scale?
I assist startups, SMEs, and large corporations in developing and evolving high-performance, secure, and scalable web & mobile applications.

JavaScript/TypeScript Fullstack Developer with +7 years of experience, I work across the entire stack: backend, frontend, mobile, and cloud, with a strong culture of quality, performance, and delivery.

Key Experiences:

  • - RATP – Development of the BFF for the Bonjour RATP mobile application (Node.js)
  • - FDJ – Tech Lead: Migration of +10 serverless microservices from GCP to AWS
  • - Veepee – Fullstack Developer on high-traffic platforms
  • - Wedding App – SaaS mobile application (React Native Expo, deep linking, notifications, multi-tenant)
  • - Easytrans – Secure health SaaS (NestJS, PostgreSQL, Azure, CI/CD)

Technical Expertise:

  • - Frontend: React, Next.js, React Native (Expo), TypeScript
  • - Backend: Node.js, NestJS, REST / GraphQL APIs
  • - Cloud & DevOps: AWS (Lambda, S3, RDS), Azure, CI/CD, Docker
  • - Architecture: Clean Architecture, TDD, performance & scalability

Services:

  • - Web & mobile SaaS development
  • - Node.js / NestJS Backend
  • - React / Next.js Applications
  • - React Native Mobile Applications
  • - Cloud & serverless migration
  • - Technical refactoring & performance optimization
  • - API, Stripe, Auth, SSO Integrations

Why work with me?

✔ Product vision + technical expertise
✔ Clean and maintainable code
✔ Clear and proactive communication
✔ Respect for deadlines and business objectives

👉 Available for short or long-term missions
💬 Quick response within 1 hour.

  • English

    Fluent

  • French

    Native or bilingual

  • Spanish

    Conversational

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

Experience

  • WeddingApp
    SaaS mobile application
    DIGITAL AND IT
    January 2025 - March 2025 (2 months)
    Paris, France
    Design and development of a SaaS mobile application for personalized digital wedding invitations.

    • - Multi-tenantmobileapplication (codes per event)
    • -React Native ExpoDevelopment
    • - Deep linking management (Branch.io)
    • - **Push notifications**, news feed, photo sharing
    • -Node.jsbackend with customizable business logic
    • -iOS & Androidstore deployment

    Stack:React Native Expo, TypeScript, Node.js, AWS, Branch.io

    Result:Commercialized product, used by couples and their guests
    React Native NestJs Expo Typescript Mobile Development
  • Easytrans
    Secure health SaaS
    MEDICAL
    April 2024 - June 2024 (2 months)
    Development of a SaaS platform (Web and Mobile) facilitating medical transmissions within hospital departments, with strong security and reliability requirements.

    • -Modularandsecure**backend** design
    • - Management ofusers**, **services**, and **permissions
    • - Robust and performantREST APIs
    • - OptimizedPostgreSQLdatabase
    • - AutomatedCI/CDand cloud deployment
    • - Compliance withhealth business constraints

    Stack:NestJS, Node.js, TypeScript, PostgreSQL, Azure, CI/CD

    Result:Stable production platform, adopted by medical teams
    React.js React Native NestJs PostgreSQL Microsoft Azure
  • RATP SMART SYSTEMS
    Backend Developer - NodeJS
    TRANSPORTATION
    March 2023 - Today (3 years and 4 months)
    Paris, France
    Development of the Backend For Frontend for the Bonjour RATP mobile application. Critical, secure, and performant APIs, used at scale by users.

    • - Performance-orientedNode.js / TypeScriptDevelopment
    • - Design ofREST APIstailored to mobile needs
    • - Management ofsecurity**, **authentication**, and **authorizations
    • - Integration with existing business services
    • - Optimization of response times andscalability
    • - Close collaboration withmobile&productteams

    Stack:Node.js, TypeScript, REST APIs, BFF Architecture

    Result:Reliable backend in production on a high-traffic application
    Node.js Hexagonal Architecture Backend Development Typescript Redis
Check out Dan's experience

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Education

  • Bachelor
    Epitech
    2017
  • Expert in Information Technology.
    Epitech
    2019

Skill set

Web Development
MongoDB
MySQL
HTML5
CSS3
JavaScript
Git
Fullstack
Typescript
GraphQL
Frontend Development
Backend Service Development
External API integration
Front End Interface Development
Mobile App Deployment
CI/CD Management
Cloud Integration
Microservices Architecture
Scripting Automation
Content Integration
React Native
PostgreSQL
JavaScript Developer
Bash
Containerization and Virtualization
Database Management (e.g., SQL, NoSQL)
Cloud Platforms and Infrastructure
Amazon Web Services
Hexagonal Architecture
PubSub
Firestore
firebase
lambda
AWS
DynamoDB
AWS Lambda
GO
Node
Docker
C++
C
PHP 5
Wordpress

Categories