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Julien GuntherJG

Julien Gunther

Backend software engineer

€600/day
Lausanne, CH
3-7 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Julien

🎯 Backend developer | Software architecture • CI/CD • Modernization

👋 Hello! I am an independent developer based in Lausanne, with over 5 years of experience in backend development. I work on various technical projects, ranging from designing robust software architectures to modernizing existing applications.

I have supported teams in implementing good development practices, optimizing application performance, automating delivery processes, and improving code quality and maintainability.

🧩 I bring comprehensive expertise in:
- Developing modern applications
- Designing modular and scalable architectures
- Automating tests and deployments (CI/CD)
- Securing access and managing user permissions
- Taking over and modernizing existing code

💻 Technologies mastered:
Java, Spring Boot, Maven, Git, PostgreSQL, Docker, GitLab CI, Ansible, Kubernetes, Python and its ecosystem (scripts, automation, APIs).
I am also the author of the open-source library timeit_decorator (dedicated to fine-grained performance analysis in Python).

✅ What I offer:
- Rigorous, documented, and maintainable work
- Fluid communication with business and technical teams
- A pragmatic, results-oriented approach

📍 Based in Lausanne, I am available for remote, hybrid, or on-site missions in French-speaking Switzerland.

📅 Availability: from August 22, 2025
💬 Languages: French (native), English (professional)

👉 Feel free to contact me to discuss your project!
  • French

    Native or bilingual

  • English

    Fluent

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

Experience

  • ilem SA
    Software developer
    SOFTWARE PUBLISHING
    August 2023 - August 2025 (2 years)
    Plan-les-Ouates, Switzerland
    • Development of new business features with Spring Boot, Vaadin, and RabbitMQ.
    • Maintenance and evolution of an internal framework based on Spring Boot and Vaadin.
    • Leading the migration of a GWT application to Spring Boot and Vaadin.
    • Design and optimization of SQL queries on Oracle, MySQL, and MariaDB.
    • Deployment and configuration of Dynatrace for observability and performance diagnostics.
    • Setup and maintenance of CI/CD pipelines with GitLab CI.
    • Management of application lifecycle on Kubernetes (deployments, services, ingress, etc.).
    • Installation and configuration of tools via Helm charts (RabbitMQ, MinIO, Graylog, etc.).
    • Automation of application deployment on multiple servers via Ansible.
    • Management of secrets and integration with HashiCorp Vault.
    • Participation in Agile/Scrum teams and code reviews.
    • Technical support to internal teams and clients on developed/maintained applications.
    • Writing and maintaining technical documentation.
    • Setup of monitoring and alerts for system supervision.
    • Development of Python and Bash scripts for various projects (automation, integrations, and internal tools).
    • Participation in defining software architecture and best practices.
    • Training and coaching developers on the use of internal tools and frameworks.
    Spring boot Vaadin RabbitMQ Kubernetes Gitlab CI/CD
  • Meanquest
    Software developer
    SOFTWARE PUBLISHING
    August 2020 - August 2023 (3 years)
    Écublens, Switzerland
    - Development of custom features on the Creatio platform for the recruitment team
    - Automation of recruitment processes: matching candidates, assignments, and client needs
    - Implementation of advanced logic for CV analysis and valorization to improve the relevance of proposed profiles
    - Creation of custom interfaces and business pages allowing recruiters to easily access key information
    - Exploration of an SAP B1 database without documentation: reverse engineering and setup of SQL views for analysis
    - Development of analytical views (SQL Server) on the SAP database for HR reporting and piloting needs
    - Close collaboration with business teams to adapt tools to their daily needs
    Creatio JavaScript C# SQL Server SAP B1

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Education

  • Federal Certificate of Competence in Software Development
    EPSIC
    2024
    Développement de logiciel en mode agile, mise en place de pipeline CI/CD, bonne pratiques de code, ...

Skill set

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