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Emmanuel CousinEC

Emmanuel Cousin

Developer - Expert Ruby on Rails | JS | Hotwire

€700/day
40 projects
Paris, FR
8-15 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Emmanuel

Project manager engineer by training, I have been working in the web and startup sector for ten years. Fullstack developer specializing in Ruby on Rails and knowledgeable about the startup world, I have solid technical and intrapreneurial experience allowing me to provide quality services, in line with my clients' technical and business challenges.

The main areas in which I operate are:
- Realizing startup ideas through rapid prototyping (MVP)
- Scaling an MVP to an industrialized version aligned with business challenges
- Creating responsive websites
- Creating back-offices
- Adding and enriching features (frontend and/or backend)
- Creating APIs
- Refactoring

I also work in the following areas:
- Connecting existing applications to external services (Stripe, Twillio, MangoPay...)
- Performance audit and optimization
- Setting up functional, unit and/or integration tests
- Setting up production environments (Ruby on Rails stack)
- Setting up/optimizing production workflows for small technical teams (early-stage startups, Agile methods, SCRUM or Kanban methodologies)
- Coaching in Ruby on Rails development for junior profiles

Do not hesitate to contact me; I ensure that your project is defined and clear for all parties, and can help you break it down into deliverables to offer you better visibility of its development time.

See you soon,

Emmanuel
  • English

    Fluent

  • French

    Native or bilingual

  • Portuguese

    Conversational

Remote only
Primarily works remotely

Experience

  • Spring
    Senior Software Engineer
    June 2024 - April 2025 (10 months)
    Oslo, Norway
    Spring creates equal investment opportunities for everyday investors through a single, user-friendly platform. By handling everything from opportunity discovery to trading in one system, Spring simplifies complex processes so regular people can access markets previously reserved for financial professionals.
  • Reprtoir
    Senior Software Engineer
    July 2021 - March 2024 (2 years and 8 months)
    Cannes, France
    Notable Developments:
    • Enhanced their existing ElasticSearch implementation to create robust, responsive portals accessible to clients' Right-Holders.
    • Integrated ElasticSearch's filtering system with their RedShift databases to develop an advanced analytics suite using React.
    • Introduced AI capabilities to enable searching for a list of tracks similar to a given track, regardless of the source (internal libraries, Spotify, uploaded audio files).
    • Utilized AI to allow searching for tracks based on a free description rather than just keywords.
    • Leveraged the above developments to empower the company's clients in creating compelling libraries to showcase their content.
  • Small Door Veterinary
    Lead Engineer
    HEALTH AND WELLNESS
    February 2021 - July 2021 (5 months)
    New York, United States
    Small Door Veterinary was at the time a 1-year-old concierge practice in Manhattan’s West Village and a Certified B Corporation. They offer an around-the-clock telemedicine service and in-clinic features for cats and dogs via a paid membership plan.

    I was hired as a transitional contractor to help them scale their business as they plan to grow from 1 to 24 clinics by 2025, accompanying them with internalizing their Engineering team, upgrading their tech stack and training their latest recruits.
    Ruby on Rails React.js Terraform JavaScript Amazon Web Services

Reviews

5.0

Out of 34 ratings

G

Gilles

Directeur - SASU HANADA

Reviewed on 11/26/2025

Good collaboration
E

Emmanuel

tauxZen

Reviewed on 12/30/2020

As usual, excellent work done by Emmanuel. Always the same attention to being in line with expectations and rigor in execution.

Recommendations

FU
Trip LevineTL
FU
+2
Former user and 4 other people have recommended Emmanuel

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Education

  • Certificate in Applied Sciences
    Université de Sherbrooke
    2012
  • Engineer from École Centrale de Lille, specialization in Industrial Engineering and Entrepreneurship
    ITEEM
    2012

Skill set

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