Vincent Van Hollebeke

As Lead SRE, I drive the design of the new information system infrastructure at 42, with a global ambition: building a unified platform for all 54 campuses worldwide, spanning 5 continents and serving 25,000 active students. Our mission is to deliver a highly available, scalable, and resilient infrastructure capable of ensuring fast response times—no matter where our users are. This challenge is at once technical, human, and strategic. My key responsibilities: - Leading a 5-person infrastructure team - Defining the technical roadmap and ensuring successful sprint delivery - Balancing product vs. technical priorities - Acting as tech lead for architecture decisions - Running agile ceremonies: retrospectives, refinements, weekly standups - Selecting and validating core tools of our stack - Managing and tracking the infrastructure budget in collaboration with leadership Tech stack: - Cloud & IaC: AWS, Terraform, Ansible - Orchestration & GitOps: Kubernetes, Helm, ArgoCD - Monitoring & Observability: Datadog

My primary responsibility was to coordinate the large-scale migration of all Git repositories from BitBucket to GitHub, ensuring a seamless and reliable transition. This involved end-to-end planning, execution, and validation to guarantee that every codebase preserved its integrity and functionality throughout the process. Delivering this project required not only strong technical expertise but also effective communication and cross-team collaboration. The scope was significant: 2,000 repositories, 600 users, and 40 teams, underlining both the scale and the complexity of the initiative. Technical environment - Cloud: Azure & GCP - Orchestration: Kubernetes - Infrastructure as Code: Ansible, Terraform - Version control: GitHub - Scripting: Python Key achievements - Designed and implemented a custom Git migration tool, reducing the impact on development teams and streamlining the transition. - Defined and set up the GitHub organizational structure, including teams, permissions, and access rights. - Successfully migrated all repositories from BitBucket to GitHub, preserving pull requests and LFS objects. - Advocated and enforced GitHub best practices around code quality, maintainability, and security. Skills: GitHub · Kubernetes · Microsoft Azure · Google Cloud Platform (GCP)

As a Senior DevOps Consultant in a multi-cloud environment, I was responsible for advising, designing, and deploying high-performance and secure infrastructure, while fostering a DevOps culture and promoting best practices. Technical environment - Cloud providers: AWS, GCP, Azure - Orchestration: Kubernetes - Infrastructure as Code: Terraform - Continuous Integration: GitHub Actions - Continuous Deployment: Spinnaker Key achievements - Successfully planned and executed the deployment of a new multi-cloud infrastructure, adhering to best practices in security, scalability, and cost optimization. - Migrated production databases to the new infrastructure with zero downtime, ensuring data integrity and minimal impact on end users.

During my tenure at Happydemics, my primary responsibility was to develop and design a cloud infrastructure that aligned with the organization's requirements in terms of effectiveness, security, and affordability. My technical skills centered on the utilization of various AWS cloud services such as Elastic Beanstalk, Amplify, Route53, RDS, CloudFront, and IAM, as well as infrastructure-as-code with Terraform and a CI/CD process supported by GitHub Actions. Some of my notable achievements include streamlining and optimizing the Terraform codebase, reducing infrastructure expenses, and successfully migrating the production database.

In a multi-account AWS environment, my mission is to provide the most reliable platform as possible and assist developers by giving them advices and the tools they need. Technical Environment : - AWS cloud services: usage of EC2, ECS, RDS, VPC, Route 53, CloudFront, IAM - Automation is made with Ansible, Terraform and Spinnaker - Continuous integration and delivery with Jenkins Main achievements : - Design and deploy the next Meero infrastructure around ECS - Migrate workloads from EC2 instances to ECS clusters - Provide the stack allowing dynamic environments

With high security and privacy constraints, my job consisted to build the technical platform around Kubernetes/3DS Outscale.

In a Google Cloud/Kubernetes environment my mission was to provide the right infrastructure for the company's needs. - Conceived and deployed the infrastructure with Terraform - Deployed Kubernetes clusters using autoscaling and dedicated node pools - Migrated deployments from hand made to custom HELM charts - Moved the CI to GitLab - Enforced platform security

As a technical lead, my missions are now more centered about monitoring and alerting. My main objective is to give my company the framework that allows: To be the most proactive as possible on production issues Anticipate infrastructure scale up Save time on incident investigation and resolution This pass by many actions: Deal with the legacy monitoring stack: Telegraf/InfluxDB/Kapacitor Migrate to a new monitoring stack: Prometheus/Alert manager Share with other teams monitoring best practices. Write and apply the on call process

Everyday Technical support Automate things Investigate and fix performances issues Develop reliable core components for other teams Oncall duties for critical high availability services Technical Environment AWS cloud services: More than 1000 EC2 instances and heavy usage of ECS, RDS, VPC, Route 53, CloudFront, IAM Configuration management and automation made with Ansible and Terraform Continuous integration and delivery with Jenkins helped by StackStorm/Artifactory Main achievements Improved overall reliability on ElasticSearch clusters Provided tooling to automate, manage and monitor ElasticSearch clusters Designed and implemented the new CI/CD supply chain

- Enhance availability, performance, and overall reliability for production services - Promote the generalization of automation tools as Ansible - Designed and set up the metrology service (Prometheus/Grafana) to gain visibility on critical production metrics, anticipate future issues, and allowing capacity planning

As member of the SRE NoSQL team, my mission was to provide backends for applications requiring high performance, availability and scalability. == Key technologies == - Couchbase - Cassandra - ElasticSearch - RabbitMQ - Graphite == Technical Environment == - 20000 servers dispatched in 7 datacenters around the world - Configuration management and automation with Chef - Continuous integration and delivery helped by Jenkins == Main achievements == - Restructured ElasticSearch clusters by optimizing configurations and adding dedicated nodes, in order to support the massive growth - Taught other teams about effectively using ElasticSearch and Kibana - Worked on Couchbase clusters migrations - Wrote the Cassandra to HDFS backup tool (https://github.com/criteo/cassback) - Performed frequent oncall duties for critical high availability services