Guillaume Saint Etienne

Experienced in building enterprise‑grade platforms from scratch using .NET Core, C#, TypeScript or Java, and modern cloud/open‑sourced stacks. Led a 30‑month mission at ITER.org, designing the core of ICP4 (Integrated Content Platform), gathering large‑scale engineering and business data. Strong expertise in Hexagonal Architecture, scalable REST APIs, Docker, MongoDB, event‑driven systems, DDD/TDD, and CI/CD. Agentic Coding with Claude since 2024. Also led teams delivering Azure‑based or self‑hosted APIs, Angular front‑ends, and enterprise telephony systems (Microsoft Teams). Skilled in workflow design, software models, collaborative tooling, DevOps, technical strategy for SMEs & retail environments.

Funding a Domain StoryTelling workshop with POs, UX then dev for a new proMect (artists worlds). Learning blockchain principles and Event Sourced architecture build by JB Dusseaut. Using Kotlin to propose a new implementation of the Java seed on GCP with Vertx. Coding in pair programing using KotlinTypeScriptReact.

Helping in the product strategy with DDD insights and workshops counselor for the CTO and the CEO: Business Canvas, Wardley Maps, Event Modeling, Domain Story Telling, Miro, Slack, Jira, Jenkins, Docker. CODE: Kotlin, Java, Spring Boot, JPA, Mongo DB, Artemis. MET+ODS: DDD, TDD, Mutation Testing, Sonar, Promyze, ArchUnit ... DevOps mindset. )