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Eder Junior De SouzaEJ

Eder Junior De Souza

Full Stack Developer

€300/day
Paris, FR
3-7 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Eder Junior

Senior Full Stack Developer, I help companies design and deliver reliable, performant, and scalable web applications.

With over 5 years of experience, I specialize in modern backend .NET (C#, Web API, EF Core) and frontend (React, Vue.js). I work on creating products from scratch as well as improving or redesigning existing applications.

My goal is simple: transform your business needs into solid, maintainable, and quickly usable technical solutions. I favor clean architectures (Clean Architecture), readable code, and sustainable technical choices to avoid technical debt.

What I bring concretely:
• Rapid skill development on your projects
• Pragmatic, results-oriented solutions
• High standards for quality, performance, and security
• Clear and reliable communication throughout the mission

Comfortable working independently or collaborating with your teams, I integrate quickly and adapt to your technical and business constraints.

If you are looking for a developer who can quickly understand your challenges and deliver effectively, let's discuss it.
  • French

    Native or bilingual

  • English

    Fluent

  • Portuguese

    Native or bilingual

  • Spanish

    Fluent

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

Experience

  • Freelance, Remote
    Full Stack & Game Developer
    January 2025 - Today (1 year and 5 months)
    • ● Freelance missions and personal projects in frontend (React, Vue.js) and backend (.NET, PostgreSQL).
    • ● Prototyping and development of video games with Unreal Engine and Godot.
    .NET PostgreSQL React.js Typescript Hexagonal Architecture
  • Veepee,
    Full Stack Developer
    April 2022 - October 2024 (2 years and 6 months)
    Paris, France
    • ● Development and maintenance of critical financial software.
    • ● Backend initially in F#, then in C# (.NET), frontend in Vue.js.
    • ● Migration of two strategic projects from Vue 2 to Vue 3.
    • ● Complete redesign of a multi-country backoffice: ○ Advanced translation management. ○ Close collaboration with architects, UX/UI designers, and business teams. ○ Modernization of the interface and addition of new features.
    • ● Analysis and correction of a cross-functional, multi-vendor bug impacting sales balance, generating over 3 million euros in savings for the company.
    • ● Backend development for the Sakura Travel project: ○ Aggregation of flights, hotels, and invoices. ○ Synchronization with client declarations. ○ Generation of regulatory compliant documents.
  • Veepee,
    R&D Developer Apprentice
    September 2020 - March 2022 (1 year and 6 months)
    Paris, France
    • ● Frontend development of a "Return" platform for reselling products instead of returning them.
    • ● Stack: React / Next.js, Golang, PostgreSQL.
    • ● Implementation of: ○ Account creation and authentication. ○ User profiles and wallets. ○ High-performance homepage handling thousands of new products per day. ○ Advanced search and filters.
    • ● Close collaboration with the UX/UI team for pixel-perfect rendering.
    • ● Internal recognition for the quality, accuracy, and reliability of the interfaces.
    • ● Progressive evolution towards backend: bug fixes and feature additions (new payment methods, carriers, etc.).

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Education

  • Computer Science and Information Systems Expert
    École 42
    2022
    Expert informatique et systèmes d'information

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