Freelancer profile translated to English.
Back to original languageAbout Johann
Looking for a senior DevOps who also masters application code?
DevOps & SRE Engineer, I help companies design, industrialize, and make their cloud and CI/CD platforms reliable.
My profile combines 5+ years of infrastructure expertise (AWS, Kubernetes, Terraform, GitLab CI/CD) with 7 years of Java backend development. This dual role allows me to work on both the pipelines, observability, and resilience of platforms, as well as the application issues running on them.
My areas of intervention:
- Design and industrialization of Kubernetes platforms in GitOps with Helm, ArgoCD, or Flux
- Infrastructure as Code with Terraform: reusable modules, multi-account AWS, ephemeral environments
- Robust and secure CI/CD pipelines (GitLab CI, DevSecOps integration)
- FinOps on Kubernetes and AWS: cost observability and continuous optimization
- Observability and alerting strategy (Prometheus, Loki, Grafana)
- Security and compliance (SOC2, vulnerability scanning, secrets management)
- Cloud migrations and modernization of legacy architectures
Some concrete results from my previous missions:
- 30% reduction in cloud costs through a Kubernetes/AWS FinOps strategy
- 50% increase in development team velocity thanks to ephemeral environments
- Implementation of a complete DevSecOps strategy (Trivy, GitGuardian, DefectDojo)
My certifications:
CKAD (Certified Kubernetes Application Developer), AWS Solutions Architect Associate, AWS Certified Cloud Practitioner.
How I work:
Proactive, autonomous, and rigorous, I quickly integrate into existing teams and pay particular attention to transparency with my clients. I prefer full remote assignments in demanding technical contexts where I can provide long-term value.
Available to discuss your project.
French
Native or bilingual
English
Fluent
Remote only
Primarily works remotely
Experience
- CriteoSite Reliability Engineer — Container Platform TeamE-COMMERCEDecember 2025 - Today (8 months)Paris, FranceWithin Criteo's Container Platform team, I contribute to the design and evolution of internal tools that enable development teams to deploy their applications on Kubernetes at scale (43 on-premise clusters, several hundred internal users). The team also supports the progressive migration from the historical orchestrator Mesos to Kubernetes.
- Development and evolution of an internal Python CLI as a wrapper for kubectl and helm to simplify application deployments
- Implementation of an environment-based versioning mechanism for the CLI (based on the internal parameter store), allowing progressive deployments and easy rollback
- Design and deployment of a Coder workspace (internal cloud shell) with the pre-installed and pre-configured CLI, reducing user onboarding time
- Refactoring and stabilization of existing code to improve platform maintainability
- Maintenance and evolution of internal Helm charts
- Kubernetes technical support for user development teams
- Occasional contributions to an internal Go API (wrapper for Kubernetes APIs) and on Rundeck and Jenkins job orchestration
Technical stack: Kubernetes, Helm, Python, Go, Rundeck, Jenkins, Coder.Context: very large-scale on-premise environment, tooling mostly developed in-house, requiring rapid skill development on complex proprietary systems. - KomgoSRE & DevOps Engineer — Komgo SABANKING AND INSURANCEOctober 2020 - November 2025 (5 years and 1 month)Geneva, SwitzerlandWithin the Komgo DevOps team (SaaS platform for international trade finance hosted on AWS), I contributed for 5 years to the industrialization, security, and optimization of production platforms.Main Contributions:
- Design and implementation of a comprehensive monitoring and alerting strategy (Prometheus, Alertmanager, Loki) to improve system responsiveness and reliability
- Design and deployment of a CI/CD process with ephemeral environments, increasing development team velocity
- Development of a FinOps strategy on Kubernetes and AWS, generating cost reductions
- Implementation of a DevSecOps strategy: integration of Trivy for scanning production Docker images, application pipelines, and Terraform code
- Proof of Concept for GitGuardian and DefectDojo for centralized secret and vulnerability detection
- Security audit and definition of a DevSecOps action plan, contributing to SOC2 compliance
- Migration from Cluster Autoscaler to Karpenter on EKS clusters for improved autoscaling efficiency
- Migration of old EKS clusters to new ones to meet customer requirements for deployment location
- Migration of a self-managed MongoDB cluster to MongoDB Atlas, significantly reducing management and maintenance costs
- Adoption of GitOps with FluxCD for declarative deployment management
- Promotion of Infrastructure as Code best practices through code reviews and refactorings, improving quality and reducing maintenance time
Technical stack: AWS, EKS, Kubernetes, Karpenter, Terraform, FluxCD, GitLab CI, Helm, Prometheus, Grafana, Loki, MongoDB Atlas, Python, Trivy, GitGuardian, DefectDojo. - RitmxFull-Stack DeveloperTRANSPORTATIONNovember 2018 - October 2020 (1 year and 11 months)Paris, France
- Maintenance and addition of new features to a mobile SDK used by the SNCF ticket validation control application, adopting a Test-Driven Development (TDD) approach to ensure code quality.
- Design and development of a modern web application to replace a command-line tool, automating a manual process and simplifying its use by teams.
- Implementation of a CI/CD process that reduced time-to-market by 30%.
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Education
- ECE Paris2013
Certifications
- AWS Certified Cloud PractitionerAmazon Web Services Training and Certification
- AWS Certified Solutions Architect – AssociateAmazon Web Services Training and Certification