You're seeing this page as if you were . The main menu is still yours, though. Exit from immersion
Julien DerentyJD

Julien Derenty

Java Spring Backend Developer | Scala

€500/day
1 project
Clermont-Ferrand, FR
8-15 years

Average response time: 1 hour

Freelancer profile translated to English.
Back to original language

About Julien

Looking for a Java Spring / Angular developer?
You are in the right place.

I am a full-stack web developer with 10+ years of experience in Java Spring Boot & Angular.

As a passionate software engineer, I have designed, developed, and maintained applications used by thousands of users in diverse contexts such as:
• Corporate regulation (Previsoft – Lefebvre-Dalloz),
• Eco-responsible e-commerce (Cousu Bio),
• HR and ATS (Taleez),
• Connected security (Myfox – now Somfy Protect).

I work as a developer or technical lead, with a real understanding of the client's business. I bridge the gap between technical complexity, software quality, and product vision.

Expert Java, Spring Boot, and Angular back-end web developer, I specialize in:
• Java backend development
• Spring Boot development
• REST API development
• AngularJS to Angular migration
• Web dashboard creation
• Java backend refactoring and migration
• Continuous integration (CI/CD Jenkins, Maven, Git)
• Java/Spring performance optimization
• Java, Spring Boot, Angular code audit
• Test automation (JUnit, integration tests)
• API security (Spring Security, OAuth2, JWT)
• PostgreSQL, MySQL database management
• Full-stack Java / Angular development
• Training and support for Java/Spring teams

Accustomed to startup environments, I know how to accelerate delivery and quickly produce robust, business-oriented, and ready-to-use features.
I am experienced in designing, developing, and delivering technical solutions that concretely address business challenges: time savings, customer acquisition, automation, process optimization, user experience improvement, and product scalability.
My expertise allows me to prioritize effectively, adapt to urgency, and guarantee quality, even in demanding contexts.


Do you have a project? Let's discuss it directly on the platform.
  • French

    Native or bilingual

  • English

    Fluent

Can work on-site
Clermont-Ferrand (up to 50km), Limoges (up to 50km), Montluçon (up to 50km), Châteauroux (up to 50km)

Experience

  • Previsoft
    Spring / AngularJS Development
    LEGAL
    July 2022 - Today (4 years and 1 month)
    Roanne, France
    Previsoft is a SaaS software for professional risk management, published by the Lefebvre Dalloz group (2,000 employees).
    The solution is used by several hundred CAC40 companies and public sector organizations.
    I joined the technical team as part of a technical and functional transformation of the web platform.
    My objective was to migrate a web application from AngularJS to React.

    The team consists of:
    - 8 full-stack Spring Angular Developers.
    - 2 Product Owners
    - 1 Project Manager
    - 4 Consultants (consulting, training)

    Missions performed:
    • Development of new business features (Java Spring Boot + AngularJS)
    • Refactoring and modularization of code to improve readability, robustness, and maintainability
    • Implementation of a clearer and decoupled client-server architecture
    • Design and integration of high-performance REST APIs
    • Execution of integration tests to ensure the reliability of critical workflows
    • Improvement of CI/CD pipelines (Angular build, Maven packaging, staging deployment)
    • Code reviews, sharing best practices, and improving project quality

    Results:
    • Reduction of regression risks and increased confidence for production
    • Reduced maintenance costs
    • Improved scalability for future developments
    • Continuous improvement

    Technical context: Angular, React, Spring, Postgres, Git, SSH, Health Data Host (HDS)
    AngularJS Java Spring Boot Clean Architecture Modular architecture Java backend web developer
  • Cousu Bio
    Scala backend developer
    RETAIL (SMALL BUSINESS)
    June 2018 - February 2023 (4 years and 8 months)
    Cousu Bio is a leading e-commerce site for organic textiles since 2016.
    It attracts 3,000 visitors per week and ranks among the top search results.

    As technical lead and full-stack developer, I designed and developed the entire e-commerce platform and its management tools.
    The goal: to offer a fluid and high-performance user experience, while optimizing natural referencing (SEO) and automating back-office processes.
    I was involved in the entire technical lifecycle, from architecture to production.

    Missions:
    • Website creation (Play! Scala, VueJS, Angular)
    • SEO optimization (PageSpeed > 90, lazyloading, editorial content)
    • Development of a real-time back office (Angular)
    • Stock management with QR codes
    • Payment and CRM integration
    • Server maintenance and technical updates

    Results:
    • PageSpeed score > 90, 100% organic traffic
    • Over 1,500 orders/year, autonomous management
    • 100% faster and error-free order processing
    • Reliable and up-to-date site after 5 years

    Technical context:
    Play! Scala, VueJS, Angular 17, Postgres, Scaleway, Looker Studio,
    Scala Angular Vue.js PostgreSQL CSR Strategy
  • Taleez
    Full-stack Java / Angular developer
    HUMAN RESOURCES
    April 2015 - December 2017 (2 years and 8 months)
    Toulouse, France
    Taleez is an HR startup founded in 2014, initially a job search engine, then an ATS (Applicant Tracking System).
    It now serves over 4,000 clients (SMEs, mid-sized companies, local authorities) and manages millions of applications through its SaaS platform.

    I joined the startup from its early days as a full-stack developer, then moved into a lead developer role during the pivot to ATS.
    Initially, I optimized the search engine's performance (400,000 listings, 20,000 emails sent/day), then designed and developed the new recruitment management platform from scratch.

    Missions:
    • Flow optimization (deduplication, alerts)
    • Android app for searching and receiving job offers
    • Development of the new ATS (Angular, Spring Boot)
    • Multi-posting of job ads (API, Selenium)
    • CV database search
    • Career site generator

    Impact:
    • Transition from a simple search engine to a complete SaaS platform, with a clear positioning in the HR tools market
    • Successful launch of the ATS, onboarding dozens of clients in the first year
    • Deployment of a robust back office, designed for HR autonomy and product scalability
    • Skill development of the technical team and code structuring to accelerate delivery
    Java Java Spring boot developer Android Angular

Recommendations

These freelancer profiles also match your criteria

AgathaA

Agatha Frydrych

Backend Java Software Engineer

4.7

(3)

2

BaptisteB

Baptiste Duhen

Fullstack developer

4.6

(4)

5

AmedA

Amed Hamou

Senior Lead Developer

4

(2)

7

AudreyA

Audrey Champion

Web developer

4.3

(3)

4

Education

  • Computer Science (Software Engineering) and Applied Mathematics
    ENSEEIHT
    2013

Skill set

Categories