Sébastien Heilig

AsTech LeadandFreelance Team Leadfor Banque Raiffeisen, I manage the technical direction and supervision of a development team dedicated to digitizing credit applications. My main mission is to integrate the nCino SaaS solution (hosted onSalesforce**) with the **T24Core Banking System, designing a reliable, scalable architecture aligned with regulatory and business requirements.

I defined and implemented a modern event-driven architecture based ongRPCandKafka**, promoting resilience, performance, and interoperability between different systems. Microservices deployment is managed on **OpenShift**, with a **GitLab CI/CDpipeline ensuring smooth, automated, and secure delivery.

In parallel to the technical aspects, I assume a leadership role: mentoring and coaching developers, defining best practices, code reviews, and coordination with business teams and technical partners. I also participate in strategic architectural choices to ensure the sustainability, quality, and security of the application ecosystem.

This role allows me to combine in-depth technical expertise (Java/Kotlin, Spring Boot, microservices, Kafka, containerization) with management responsibilities (leadership, team management, cross-functional coordination) within a strategic digital transformation banking project.

I Joined a dynamic team as Tech Lead, quickly mastering Python to spearhead development across multiple projects. Leveraged new skills to efficiently design and implement optimized features, successfully deploying applications in production using Docker containers to enhance scalability and performance.

I worked on the following projects:

• SyncOp: synchronizing Cascade Operations from Efront to Avaloq and the reverse.

• Fricadel: automating the creation of Notices inside Efront from an external system named Canoe.

I provided Java code reviews on projects delivered by Pictet Technologies company, and helped my colleagues to support these applications.

I was responsible of deploying these applications using GitOps and ArgoCD to ease the deployment by configuration.

As a Senior Java/Kotlin Developer in a dynamic team of five, my role is focused on developing, maintaining, and enhancing more than 30 shared libraries and a variety of microservices within an Openshift environment for BIL. Working with a foundation in Spring Boot, I am responsible for delivering high-quality, secure, and performant code, aligning with rigorous standards for the entire development ecosystem at BIL.

My mission centers on creating and maintaining shared, high-quality resources and tools to enable seamless and secure development for all teams at BIL. This includes:

• Ensuring double code reviews, 100% Sonar compliance, full code coverage, and no critical vulnerabilities (CVEs) for all releases.

• Supporting legacy code improvements and reducing technical debt by modularizing a monolithic application into Spring Boot starters.

• Developing foundational artifacts such as:

→ bil-dependencies to manage Spring library compatibility,

→ bil-bom for version control of external dependencies,

→ bil-parent for overarching dependencies and plugin management.

Additional contributions include updating Maven archetypes and managing extensive migrations across Java and Spring Boot versions (Java 8 → 11 → 17, Spring Boot 2 → 3). Alongside release management, I create migration guidelines to support fellow developers as we update critical libraries.