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Sylvain GuillardSG

Sylvain Guillard

Fullstack JS Developer (ReactJs + NodeJs)

€800/day
2 projects
Paris, FR
8-15 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Sylvain

Hello,

As a Full Stack Typescript Developer and Architect with 7+ years of experience on various e-commerce, Big Data, or AI projects, in agencies, with publishers, or as a freelancer, I would be delighted to discuss your project with you and support you in the next steps of your development.

Passionate about development, I attach great importance to delivering simple solutions to complex problems with clean, maintainable, and scalable code.

With several years of IT experience in a multicultural context (New Zealand), I enjoy sharing, exchanging, and building connections with the different teams I have the chance to work with.

My areas of expertise include Front End (React) and Back End (Node Js) in Typescript, as well as the use of BDD tools (Postgres - MySql).

And for server administration, mastery of the AWS ecosystem (RDS, Cognito, SNS, SES, CloudWatch, IAM, Route 53 ...)

I remain at your disposal,

Sylvain
  • French

    Native or bilingual

  • English

    Native or bilingual

  • Spanish

    Fluent

Remote only
Primarily works remotely

Experience

  • Postumo
    Chief Technology Officer
    BANKING AND INSURANCE
    September 2021 - Today (4 years and 8 months)
    Paris, France
    Postumo Start Up CTO, responsible for building the web application (AI with client and admin interfaces).

    Key responsibilities:

    - Building website architecture (with DEV & TEST & PROD environments)
    - Create UI and UX design with its Front end implementation
    - Develop a complex back End API to meet the AI's needs

    Technologies used:

    - Architecture Infrastructure: AWS Route 53 + AWS RDS + AWS Cognito + AWS SNS + AWS SES + AWS CloudWatch + AWS IAM. Deployment with Vercel (Serverless AWS Lambda and S3).
    - Front End: Next JS + Typescript + React JS + Tailwind CSS
    - Back End: Next JS + Typescript + Node JS + Postgres + Prisma (ORM) Outcomes:
    - Delivery of a fully functional web application: https://app.postumo.fr/
    Next.js AWS React.js Node.js Prisma PostgreSQL Typescript
  • Qrious Limited
    Software Engineer
    SOFTWARE PUBLISHING
    September 2020 - September 2021 (1 year)
    Auckland, New Zealand
    Responsible for developing BackEnd and FrontEnd Solutions in teams of 2 to 5 developers following Agile methodology.

    Key Responsibilities:

    - Design and develop optimized high-quality solutions on both front end and back end using the most adapted technologies and frameworks.
    - Perform code reviews to ensure code quality and consistency throughout the codebase (100% immutability, performance, simplicity). Write integration tests.

    Typescript technologies used: Back End:

    - NodeJs - Prisma - Nexus - Hasura - PostgreSql - Next JS
    - REST + GraphQl API Front End:
    - Recoil - Redux - URQL - React-Testing-Library - Sass Outcomes:
    - Delivery of a fully functional web application used by one of the biggest NZ company in the agricultural business.
    - Delivery of a marketing web application prototype.
    Next.js Typescript React.js Node.js Jest GraphQL PostgreSQL
  • ezyVet
    Full Stack Engineer
    SOFTWARE PUBLISHING
    September 2019 - August 2020 (11 months)
    Auckland, New Zealand
    In charge of implementing new features and resolving bugs in a company of 20+ developers working on a B2B software. Acted as a link between Back End and Front End developers in a Scrum Team of 8 people, designing and developing PHP API as well as its React implementation.

    Key Responsibilities:

    - Understand a 10+ years codebase legacy written in PHP and Javascript and propose solutions to migrate to a REST API with a React Front End.
    - Ensure that Back end and Front End developers are in sync, and code the solutions following best practices.
    - Write the associated tests (unit + integration).
    - Follow the tickets until QA testing is done and feature has been merged.

    Technologies used:

    Front End: React JS - Redux - Material UI - React Testing Library - React Table - React ORM - Saga Back End: Laravel / Mysql Outcomes:
    - Successful delivery of one of the main features complete migration to the modern stack (API with React)
    - Fix critical production bugs
    - Implement highly complex features such as real-time pub/sub server and its associated Front End logic

Reviews

5.0

Out of 2 ratings

S

Serge

Serge Chanti

Reviewed on 11/8/2022

Always satisfied with Sylvain's work and attitude, we will not hesitate to call on him again. He understood our needs and took charge of the project to deliver exactly what was planned on time, thank you again!
S

Serge

Serge Chanti

Reviewed on 10/4/2022

Sylvain's advice was invaluable for the design of our web application. His understanding of our needs and his technical skills greatly contributed to the success of our collaboration. I recommend.

Recommendations

Laetitia SergentLS
Lucie P.LP
Elise BellaigueEB
+1
Laetitia Sergent and 3 other people have recommended Sylvain

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Education

  • Master of International Business
    IESEG School of Management
    2014
    Master's degree, Management-International business
  • Web Developer - Professional Skills Validation
    Sopra Steria
    2016
    Validation des acquis professionnels en tant que développeur Web Full Stack (JAVA JEE - MySql - HTML - CSS)

Certifications

  • Docker Certified Associate
    Docker
    2019
    Docker Mastery Certification
  • Web Developer
    Sopra Steria
    2016

Skill set (23)

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