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Sylvain JustSJ

Sylvain Just

Supermalter

Expert Stripe API & Online Payments

€760/day
114 projects
Marseille, FR
15+ years

Average response time: 1 hour

Freelancer profile translated to English.
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About Sylvain

✅ Senior E-commerce Developer
🧠 Stripe API Expert - Tech Lead Symfony / Sylius / PHP
💪 15 years of experience serving your WEB projects.

Integrate your payment or E-commerce solutions without extra cost or surprises,
thanks to agile and collaborative methods developed over more than 150 projects.

You are:
  • A digital communication agency,
  • A VSE (Very Small Enterprise),
  • A Startup
You are integrating or migrating a payment platform for yourself or one of your clients but:
  • You don't have a backend developer on your team
  • You need an outside perspective to estimate the project scope (deadlines, costs)
  • The project was due last week and you no longer have a developer to finalize it
You need a preliminary analysis before launching into a payment project
  • By subscription - classic or usage-based (pay-as-you-go),
  • Deferred (Buy Now Pay Later - BNPL),
  • With fees or intermediary (dropshipping, marketplace, ...)
I offer you:
  • To integrate, audit, or debug any payment platform
  • Regardless of the programming language or framework of your project
  • Regardless of the E-commerce site (WooCommerce, Sylius ...)
About me 😁:
  • I've always loved solving puzzles, and IT, especially development, is made for me! 🧠
  • I like to be helpful, 🤝
  • I like work done well (to the point of obsession - some might even say it borders on maniacal), but it's also thanks to this that I've embraced good development (craftsmanship) and project management (agile) practices, 🤓
  • I like working in the command line behind a black screen, it makes me feel like Neo in The Matrix 😎
  • I like to automate, everything, all the time... but I'm getting better 🤒
  • I like communicating concepts with emojis ❤️ and images 🏞️ to give a more lively dimension to endless lists 🤯
  • French

    Native or bilingual

  • English

    Fluent

Remote only
Primarily works remotely

Experience

  • DREAMABLE SAS
    Malt logoOn Malt
    Expert Payment Platforms / Lead Dev Symfony
    March 2025 - June 2025 (3 months)
    Marseille, France
    Mission
    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    Refactoring of the checkout to a client-server NextJS - Symfony API architecture from a full Twig / Symfony environment.

    Project Focus
    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    ● Status assessment and needs analysis
    ● Technical and Functional Specifications
    ● Sprint Planning
    ● Iterative extraction and refactoring of cart functionalities
    ● Detailed documentation of the decision-making process and technical analyses
    ● Transmission of documentation and functionalities
    ● Incident management support and follow-up
    ● Management of unit tests and static code analyses

    Technical Environment & Methodology
    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    ● Symfony 4.4 - PHP 7.3
    ● Docker
    ● GitHub / GitHub CI
    ● ElasticSearch
    ● NextJS
    ● PHPUNIT
    ● PHPSTAN
    ● PHPCS
    ● Adyen
    Symfony Payment Platform E-commerce Online Payment Checkout Tunnel
  • scrapingbot
    Malt logoOn Malt
    Expert Stripe Billing API / 🔥 Urgent Web Debugger 🪲
    December 2024 - December 2024
    Marseille, France
    Mission
    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    Analysis and Correction of a Stripe bug during payment in the custom code of a WordPress child theme


    Project Focus
    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    ● Stripe Logs Analysis
    ● HTTP Logs Analysis
    ● Application Logs Setup and Analysis
    ● Code Analysis
    ● Setup of consistent error logs and return codes
    ● Bug Fix + Tests and Production Deployments (Hotfix)


    Technical Environment
    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    ● WordPress
    ● Stripe Payment
    ● Stripe Billing
    ● Stripe API
    ● SSH
    ● Linux Server Management
    ● Digital Ocean
    ● GitHub / Pull Request / GitHub Actions
    PHP Stripe Billing Stripe Stripe API Git
  • Tech & Strategy
    Malt logoOn Malt
    Stripe Billing API Consultant (Pay-as-you-go)
    October 2024 - November 2024 (1 month)
    Marseille, France
    Mission
    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    Provide advice on using Stripe to:
        ⇒ offer tiered AI subscriptions based on token packs,
        ⇒ add pay-as-you-go for additional token packs,
        ⇒ manage customer payment and subscription data.


    Project Focus
    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    ● POC on the Stripe API to validate the project owner's proposal.
    ● Proposal of a solution that closely matches the specifications.
    ● Documentation in the form of UML diagrams and recommendations.
    ● Guidelines for Stripe integration and configuration.


    Technical Environment
    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    ● Stripe Billing
    ● Stripe Invoice
    ● Stripe Checkout Session
    ● Stripe Taxes
    ● Stripe Customer Portal
    ● Seat-based payment (usage-based, on-demand, pay-as-you-go, per-seat)
    ● Recurring subscriptions
    ● Payment
    ● Bubble
    Online Payment E-commerce Stripe Billing Stripe Stripe API

Reviews

5.0

Out of 49 ratings

S

Simon

Corse-Immo-Encheres.fr

Reviewed on 10/30/2024

A true professional! I highly recommend +++!!
B

Bérenger

SARL MAISON BLOOM

Reviewed on 10/9/2024

Sylvain was top from start to finish. Excellent communication, great organization, and efficient execution. I highly recommend him!

Recommendations

Gabrielle ClaironGC
Jean David BoscouzareixJD
Gabrielle Clairon and 1 other person have recommended Sylvain

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Education

  • Higher Technician in Computer Systems
    AFPA
    2007
  • Computer Development Designer
    AFPA
    2010

Certifications

Skill set

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