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Thomas GuilloryTG

Thomas Guillory

Supermalter

Engaged Web Developer | Freelance for good

€600/day
3 projects
Paris, FR
8-15 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Thomas

Experienced Fullstack Web Developer (+13 years) | Seeking impact-driven missions

With 13 years of experience in startups/scaleups as a developer, team leader, and engineering manager, I have gained solid expertise in designing and deploying large-scale web applications used by millions of users.

I am now looking to leverage this experience for projects with a positive impact in the following areas:
  • Ecological transition: climate, resources, biodiversity, water, ...
  • Fight against poverty
  • Reduction of inequalities
With extensive experience in various languages/frameworks/infrastructures, I am capable of working with any stack on a web project. However, I have more experience with the following technologies:
  • Javascript, Typescript, Python, Ruby
  • React, Next.js, Complex CSS Animations
  • Nodes.js, Ruby on Rails
  • SQL & NoSQL Databases
  • AWS
  • Docker, Github, Gitlab CI, Atlassian suite
  • Agile Methodologies

I can offer my services in the following areas:
  • Full-Stack Architecture
  • Designing a service "from scratch"
  • Code takeover and application maintenance
  • Adding features to an existing product

Let's connect!

Contact me for a quick, no-obligation 30-minute chat to explore how my expertise can meet your goals.
  • French

    Native or bilingual

  • English

    Native or bilingual

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

Experience

  • SASU FNCCR
    Malt logoOn Malt
    Interim CTO
    PUBLIC SECTOR
    June 2025 - September 2025 (3 months)
    Paris, France
    • Recruitment of 10 engineers (developers, data engineer) for 3 projects with short deadlines (~6 months)
    • Implementation of development processes: agile cycle, product-engineering collaboration, internal demos
    • Evaluation of AI tools to boost team practices
  • Data For Good
    Front-End Web Developer
    ENVIRONMENTAL
    February 2025 - April 2025 (2 months)
    Development from scratch of a showcase website for a citizen engagement project
    • Landing page with scroll-triggered CSS animations (React Motion)
    • User experience optimization
    • Cross-browser testing & optimization
    • CMS integration for contact form submission (Brevo)
    Framer Motion React.js Next.js
  • Horatio.cloud
    Founder
    June 2022 - Today (4 years)
    Paris, France
    Horatio.cloud is an AI-powered toolbelt API that streamlines video editing.

    Key features :

    - Automatic reframing, centering on the right part of the screen
    - Automatic subtitles & enhancement with custom vocabulary and proper nouns

    - Automatic intro creation from a video extract

    - Misc tools : overlays, concatenation, bitrate enforcing, ...


    Main user : Webedia

    Stack : Python, OpenCV, ffmpeg, Whisper, LLMs, AWS

Reviews

5.0

Out of 1 rating

G

Guillaume

SASU FNCCR

Several weeks project

-

Reviewed on 10/16/2025

Thomas perfectly assumed the role of interim CTO. I can only recommend reaching out to him if you need someone highly competent quickly.

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Education

  • Computer Engineering INSA Lyon, Computer Science
    Institut national des Sciences appliquées de Lyon
    2011
    Ingénieur Informatique INSA Lyon, Informatique

Skill set

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