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Guillaume RotGR

Guillaume Rot

Fullstack Developer | Java Expert | React / Next

€450/day
Rennes, FR
3-7 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Guillaume

Fullstack Developer | Java & Spring Boot Expert + React / Next.js | Real Estate & Sports


Are you anSME, a startup, a real estate agency, or a sports cluband do you need a modern website or a custom SaaS application?
I design and developsimple and robustsolutions, perfectly adapted to the needs of small structures.

⚙️ My web development expertise

- **Backend**: Java / Spring Boot, secure and performant REST APIs
- **Frontend**: React / Next.js for modern, fast, and SEO-optimized interfaces
- **Websites & Portals**: Real estate showcases, websites for sports clubs, platforms with search and member area
- **Databases**: PostgreSQL (SQL), MongoDB (NoSQL)
- **Automation & Data**: API integration, ad scraping
- **CI/CD & Quality**: GitHub Actions, Gitlab CI, clear documentation

👉 I work autonomously and support you from the idea to the launch.

🏗️ Recent Projects

- **Rentacal**: Online tool to calculate the profitability of a rental investment, with a simple and fast interface.
- **PropertAI**: AI-based real estate analysis SaaS, which evaluates profitability, highlights the strengths/weaknesses of a property, and generates comprehensive reports for investors.

💻 Why work with me?

-7+ years of experiencein development
- Sector expertise:real estate(rental management, profitability, agency websites) andsports(club management, coaching platforms, association websites)
- Adapted to **small structures**: I develop effective solutions without unnecessary complexity
- **Responsiveness**: response guaranteed within 2 hours

📩 Need a developer for your website or SaaS?

Contact me today. Response guaranteed within 2 hours.
A first video call will allow us to define your needs and determine the best solution for your structure.
  • French

    Native or bilingual

  • English

    Fluent

Can work on-site
Rennes (up to 50km), Paris (up to 50km), Nantes (up to 50km), Le Mans (up to 50km)

Experience

  • RentaCal
    Front-end Developer
    REAL ESTATE
    September 2024 - Today (1 year and 11 months)
    Rennes, France
    RentaCal helps real estate investors calculate their returns more quickly. The multiple filters allow RentaCal users to get the profitability and cash flow as close as possible to reality.

    Tasks:
    - Development of the front and back end of the application
    - Deployment of the application with Vercel

    Technical Stack:
    React, NextJS, TailwindCSS, ShadcnUI, Prisma
    React.js Next.js React.js Developer Next.js Developer
  • Groupe Rocher
    Back-end Developer
    FASHION AND COSMETICS
    March 2023 - Today (3 years and 4 months)
    Rennes, France
    At the heart of the team responsible for the flows that transit between the different functional areas of the Rocher Group, I contribute to ensuring good communication between the different parts of the group.

    Tasks:
    ▪️ Migration of several dozen APIs from Layer7 to Apigee with OAuth2 and Basic authentication.
    ▪️ Development of flows integrating API calls using the Boomi tool.
    ▪️ Development of APIs in Java Spring Boot and Camel.
    ▪️ Creation and configuration of queues in the Solace broker, as well as its monitoring which allows checking the proper functioning of the broker.
    ▪️ Management of SQL data via PostgreSQL


    Technical Stack:
    Java 17, Spring Boot 2, PostgreSQL, Maven, GCP, JUnit, Karate, Docker, Kubernetes, Gitlab CI, Solace, Apigee
    Java Spring PostgreSQL SpringBoot Gitlab CI/CD
  • Cooperl
    Lead Fullstack Developer
    AGRICULTURE
    January 2020 - January 2023 (3 years)
    Rennes, France
    Within the transverse team, I contributed to the development of a web and mobile application for pig farmers, to help them manage their data on a daily basis.

    Tasks:
    ▪️Storage and management of NoSQL data via MongoDB
    ▪️Communication with Product Owners for the development of user stories.
    ▪️Estimation of user stories
    ▪️Writing technical specifications.
    ▪️Back-end development: Java 17, Spring Boot 2+
    ▪️Unit tests via Junit and Mockito for the backend
    ▪️Integration tests via Karate for validation and non-regression.
    ▪️Cross-tests, code reviews
    ▪️Deployment, go-live
    ▪️Production monitoring with the ELK stack
    ▪️Facilitation and participation in agile ritual preparation.
    ▪️Agile project organization using the Scrum method

    Technical Stack:
    Java 17, Spring Boot 2, Angular 14, MongoDB, Gradle, Jenkins, Karate, Docker,
    Kubernetes, RabbitMQ
    Java MongoDB SpringBoot Java Spring Boot Back-End Development

Recommendations

Philippe AcquierPA
Michaël PastoreMP
Abderahmane RasmoukiAR
+5
Philippe Acquier and 7 other people have recommended Guillaume

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Education

  • Computer Engineering
    IG2I - Centrale Lille
    2017
  • TOEIC
    IG2I - Centrale Lille
    2017
    Epreuve du TOEIC avec un score de 850

Skill set

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