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Sylvain LeroySL

Sylvain Leroy

Cloud Architect / Fullstack Developer

€499/day
Lausanne, CH
15+ years

Average response time: 1 hour

Freelancer profile translated to English.
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About Sylvain

Experienced Cloud Architect and IT Consultant | Expert in Modernization and Migration

With over 22 years of experience in IT, startups, and enterprise software development, I specialize in helping companies modernize and evolve their digital infrastructure. As a certified Cloud Solutions Architect, with deep expertise in application modernization, cloud migration (AWS, GCP), and automated framework updates, I have successfully led transformation projects for industries such as banking, insurance, and telecommunications.

I can help you to:

Modernize your legacy systems by reducing technical debt and updating your frameworks.
Seamlessly migrate your applications to the cloud, with a focus on scalability, security, and cost-effectiveness.
Design and build reliable cloud-native applications optimized for performance and adaptability.
Implement DevOps best practices for CI/CD automation, infrastructure as code, and monitoring.

As a startup co-founder, I have contributed to the creation of SaaS, cloud, and on-premise solutions, bringing hands-on experience in delivering robust and secure software at scale. My technical skills include Java, Node.js, PHP, and C++, and I have led projects in static analysis, code quality, and security through automated verification tools.

Let's collaborate to align your IT strategy with the latest innovations!
  • Russian

    Basic

  • German

    Conversational

  • English

    Fluent

  • French

    Native or bilingual

Can work on-site
Lausanne (up to 30km)

Experience

  • Amazon Web Services (AWS)
    Specialist Solution Architect - Migration and Application Modernisation
    January 2023 - Today (3 years and 5 months)
    Switzerland
    As a Software Architect at AWS, we strive for bringing the best of the Cloud innovation to our customers and accompany then in their journey. I'm involved in Cloud Migration from building our customer business case, cost optimization, to POC, Architecture design Workshop and daily support.
  • PLB CONSULTANT
    Trainer / Formator Gradle/Groovy/JUnit 5/Quarkus
    May 2021 - Today (5 years and 1 month)
    France
    I occasionally give trainings on different subjects of expertise that I like. The last ones are Groovy (QA, Developer), Gradle (DevOps), JUnit 5 (Java developer). Next year, I plan to give trainings on Quarkus, JProfiler, JBPM.
  • Byoskill
    Founder / Freelance
    May 2018 - Today (8 years and 1 month)
    Region of Murcia, Spain
    Byoskill is a small IT/Consulting company based in Lausanne/Switzerland. Our activities are around Software Craftmanship, training and legacy software migration. I decided to create this small company to make my experience avaiilable to any startup, software editors and administrations. The last ten years, I have been honing my skills on three subjects. Software Quality Assurance, Startup technical boost : I am an efficient program in Java/JS and I am offering my services to startups to help them to reach quickly to a cost effective MVP or MMF with an disruptive offer. Legacy Software Migration : through my previous experiences (my startup TOCEA, then Echoes and finally Metrixware), I have established a recognized process to migrate automatically legacy software . www.byoskill.com

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Education

  • Master 2 Research Compilation & Architecture
    Université Rennes 1
    2007

Certifications

  • AWS Certifications
    Amazon Web Services
    2024
  • GCP Certifications
    Google Cloud Platform

Skill set (29)

Categories