Freelancer profile translated to English.
Back to original languageAbout Leslie-Alexandre
Platform Engineer / Site Reliability Engineer (SRE - DevOps) for over 15 years.
Cloud or on-premise platform design, software deployment (backend), performance debugging, CI/CD, databases [...]
I am here to address your challenges with passion, elegance, creativity, and performance.
Since 2025, I have been supporting you in your AI / MLOps transition.
Agent, internal LLM model, observability, guardrails [...].
Certifications:
» Certified Kubernetes Administrator
» Google Cloud Platform for Systems Operations Professionals
Polycloud:
» aws
» gcp
» scaleway
» ovh
» hertzner
Polyglot:
» shell
» python
» golang
» typescript
Feel free to contact me :)
Leslie
French
Native or bilingual
English
Fluent
Can work on-site
Lyon (up to 50km), Paris (up to 10km), Marseille (up to 10km)
Experience
- Ten TenHead of InfrastructureSOCIAL NETWORKSDecember 2023 - March 2026 (2 years and 3 months)Paris, France
- hyperscale 5M users per day
- architecture from scratch of an AWS platform (EKS, S3, IAM, RDS)
- build & run Kubernetes (Cilium, Istio, ArgoCD, Helm, Terraform, Terragrunt)
- finOps autoscaling (Karpenter), Istio Ambient, spot instances
- build & run PostgreSQL - ScyllaDB databases
- secops WAF, mTLS (CloudFlare - Istio)
- architecture from scratch of observability metrics - logs - traces (Victoria Metrics - Prometheus / Loki / Jaeger / Sentry / Grafana / OTLP)
- WebRTC mobile and backend (sfu, turn, stun, sdp, dtls, http/3)
AWS | Istio | Kubernetes | ScyllaDB | ClickHouse | Prometheus | Golang | Rust | CF | IaC | Terraform | OpenTofu | ArgoCD - BeRealSenior Site Reliability EngineerSOCIAL NETWORKSDecember 2021 - December 2023 (2 years)Paris, France
- hyperscale +40M users per day, billions of requests per day
- architecture from scratch of a GCP platform (GKE, GCS...)
- build & run Kubernetes (Cilium, Istio, ArgoCD, Helm, Terraform, Terragrunt)
- finOps autoscaling (Keda), Istio, spot instances
- build & run databases and caches PostgreSQL - Redis
- secops WAF, mTLS (CloudFlare - Istio)
- CDN architecture (anycast, multi providers)
- architecture from scratch of observability metrics - logs - traces (Datadog, Prometheus / Loki / Sentry / Grafana)
- CI/CD GitHub Actions with autoscaling Kubernetes runner
- Node.js - Go backend
Kubernetes | PostgreSQL | Redis | NodeJS | Istio | Terraform | ArgoCD | Datadog | Cloudflare - PixwooSenior Site Reliability EngineerSOCIAL NETWORKSMarch 2021 - November 2021 (8 months)Paris, France
- Refactoring and new IaC Terraform features
- Taking over and optimizing GCP / Google Cloud Platform infrastructure
- Google Cloud Platform Architecture
- PostgreSQL database migration
- Symfony backend performance debugging
- DevOps Training
Reviews
Gaël
DATAKEEN
Reviewed on 10/9/2020
Leslie delivered quality work. He demonstrated very good communication and solid technical support. We will be very happy to collaborate with him again in the future.
Christophe
Superprod
Reviewed on 7/16/2020
Leslie found elegant and effective solutions to all the problems we presented.
Excellent experience!
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Education
- Google Developer Challenge Scholarship: Mobile WebUdacity2018
- Master's degree in Engineering, expert in information systemsISITech2014
Certifications
- Certified Kubernetes Administrator (CKA-1900-001342-0100)The Linux Foundation2019
- Google Cloud Platform for Systems Operations Professionals SpecializationCoursera2017