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Daniel ODO

Daniel O

Fullstack Developer - ReactJS/NodeJS/NextJS

€550/day
Valence, FR
8-15 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Daniel

Full stack developer for 6 years, with experience in permanent and freelance roles in France and internationally. I primarily work with technologies from the JavaScript ecosystem and have solid knowledge of several languages, for which I also provide training.
I am looking for fully remote positions, but I remain open to on-site opportunities depending on geographical proximity.
  • French

    Native or bilingual

  • English

    Fluent

  • Spanish

    Basic

  • Armenian

    Native or bilingual

Remote only
Primarily works remotely

Experience

  • OpenClassrooms
    Mentor
    March 2023 - March 2024 (1 year)
    Mentoring students in the Web Developer training program.
    • Assistance with completing projects for developers retraining or upskilling.
    • Guidance on career choices.
    • Learner evaluation.
    JavaScript React.js HTML5 CSS3
  • Juisci SAS
    Lead Developer/Frontend Architect
    January 2023 - Today (3 years and 5 months)
    Design and development of the Juisci mobile application, dedicated to health professionals.


    Frontend Architecture Redesign:

    Migration to a modern React architecture, optimized for maintenance and scalability, with strategic technology choices (adoption of React Query, TailwindCSS, and TypeScript). Result: a 60% lighter codebase and an 80% reduction in critical bugs.

    Performance and User Experience Improvement:
    • Elimination of loading times (transition from ~5-10s to < 1s for key pages).
    • Instant content display through the implementation of lazy loading and intelligent caching.
    • Improved responsiveness (60% fewer navigation screens, no loading on user actions)
    Technical Leadership and Best Practices:

    • Implementation of systematic code reviews, automated testing,
    • Training the team on DevOps best practices (CI/CD, monitoring with Sentry).
    Business Impact:
    • Direct contribution to the €5.5 million funding round in 2025.
    • User base growth: 200,000 professionals in 60 countries, including major partners like Sanofi, Servier, Royal Canin, the National Academy of Surgery, and the European Society of Radiology
    React.js Développement Front-End redux React Query TailwindCSS
  • EPHIKAS
    Freelance Full Stack Developer
    November 2022 - Today (3 years and 7 months)
    Development of an internal back-office tool to automate and optimize equipment maintenance processes at SNCF stations.

    Process Automation:
    • Design of a Node.js (backend) + React (frontend) application to replace manual processes.
    • Reduction in maintenance report validation time (from 48h to an instant process).
    • 90% reduction in company maintenance time.

    Data Reliability Improvement:
    • Integration of automatic validations and real-time alerts for anomalies.
    • 100% reduction in automaton activation errors.
    Node.js React.js SQL

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Education

  • Web Developer
    OpenClassrooms
    2021
    Développeur Web
  • Bachelor's degree, Law
    Université Grenoble Alpes
    2009
    Bachelor's degree, Law

Skill set (9)

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