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David Dumas, DevOps Engineer and Developer in Nantes, France
David Dumas

DevOps Engineer and Developer in Nantes, France

Member since September 30, 2020
For the past decade, David's worked for well known international companies such as BNP Paribas, IBM, and the Boston Consulting Group. Being an IT engineer, David views tech as a means to achieve goals and not as an end. David started with mainframes, proprietary software & virtualization, then moved on to cloud computing, open-source, and containerization with Kubernetes. David balances his love for trying out new tech with tried-and-true solutions to build stable and scalable architectures.
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Portfolio

  • Nomadic Labs
    Amazon Web Services (AWS), Scaleway, Ansible, Terraform, Go, Bash...
  • Integral Ad Science
    Amazon Web Services (AWS), Jenkins, Flux, Flagger, Docker, Kubernetes...
  • BCG GAMMA
    Amazon Web Services (AWS), Amazon EKS, Kubernetes, CircleCI, Octopus Deploy...

Experience

Location

Nantes, France

Availability

Part-time

Preferred Environment

Go, Bash, GitLab CI/CD, Kubernetes, Linux

The most amazing...

...technology I've work with is Kubernetes. I started pushing applications in production four years ago and never looked backed. Containerization is awesome!

Employment

  • Senior DevOps Engineer

    2022 - 2022
    Nomadic Labs
    • Dramatically reduced overall infrastructure costs (divided by four).
    • Implemented complete infrastructure monitoring with Prometheus and Grafana.
    • Improved Tezos GitLab pipelines to make this open-source software delivery stable and reproducible.
    Technologies: Amazon Web Services (AWS), Scaleway, Ansible, Terraform, Go, Bash, Shell Scripting, GitLab, GitLab CI/CD, OCaml, Python, Prometheus, Grafana, Docker, InfluxDB, ARM

  • Senior DevOps Engineer

    2021 - 2021
    Integral Ad Science
    • Audited and corrected cluster security and availability for production use.
    • Implemented Blue/Green or Canary deployments with Flagger.
    • Improved monitoring and alerting with Prometheus and Elastic Stack.
    Technologies: Amazon Web Services (AWS), Jenkins, Flux, Flagger, Docker, Kubernetes, Amazon EKS, Helm, Istio, GitOps, Prometheus, Grafana, Thanos, ELK (Elastic Stack)

  • Senior DevOps Engineer

    2021 - 2021
    BCG GAMMA
    • Migrated from AWS ECS to EKS (Kubernetes) and applied container best practices.
    • Delivered secured HA production infrastructure after an audit (permissions, encryption, networking, authentication).
    • Wrote continuous integration and continuous deployment pipelines for all the applications.
    Technologies: Amazon Web Services (AWS), Amazon EKS, Kubernetes, CircleCI, Octopus Deploy, Docker, Helm, PostgreSQL, Redis, Bash, Terraform, Python, Okta, Kong, Sumo Logic, AWS CloudTrail

  • Senior DevOps Engineer

    2021 - 2021
    BCG Digital Ventures
    • Improved a private Slack bot to automate creating and securing AWS accounts for new projects.
    • Refreshed the codebase to Python 3 using the latest Slack SDK.
    • Enabled AWS Config Service, Guard Duty, Security Hub, and Cloud Trail.
    Technologies: Amazon Web Services (AWS), Terraform, Python, AWS Lambda, AWS IAM, Cloud Security, Auditing

  • Senior DevOps engineer

    2020 - 2021
    Covantis
    • Finalized the delivery of a complete production infrastructure in Azure.
    • Migrated the monitoring activity to fully managed Azure solutions from on-premise Prometheus/Alertmanager/Grafana inside AKS clusters.
    • Resolved cluster performance issues related to PostgreSQL, Azure Event Hub (Kafka SaaS), and Kaleido (private Ethereum blockchain SaaS).
    Technologies: Orchestrate, OpenVPN, Terraform, Helm, Ethereum, Kaniko, Docker, Kubernetes, Azure Kubernetes Service (AKS), Apache Kafka, GitLab CI/CD, Go, Bash, Python, Node.js, Redis, PostgreSQL, Azure

  • DevOps Engineer

    2019 - 2020
    BCG
    • Delivered a great product architecture, advising on the roadmap and helping with the implementation of new features in the infrastructure. BCG was able to sell the technology to DataRobot, a unicorn valued at a billion dollars.
    • Managed up to 30 clusters, one for each customer/team, delivering the latest versions of the infrastructure and the application with new features.
    • Trained teammates on Docker and Kubernetes best practices to combine security, performance, and scaling.
    Technologies: Amazon Web Services (AWS), Node.js, Grafana, Prometheus, ELK (Elastic Stack), Okta, Keycloak, OpenVPN, Consul, Vault, Spark, MongoDB, Pachyderm, Python, Go, Terraform, Artifactory, Kubernetes, Docker Swarm, Docker, Azure, CircleCI, Jenkins, GitHub

  • DevOps Engineer

    2016 - 2018
    Effilab
    • Migrated a full infrastructure from AWS to the OVH cloud (French provider).
    • Containerized all applications and deployed them into Kubernetes clusters: Python, Ruby, and Java.
    • Created from scratch high-performant, highly available in-house services, including PostgreSQL, Redis, and Kubernetes clusters.
    • Delivered a wide range of technologies to exploit our data and optimize our business on top of our production applications: JupyterHub, Flower & Celery, Hadoop & Hive, PrestoDB, and NiFi.
    Technologies: OSI Model, TCP/IP, SQL, NGINX, Ceph, OpenStack, Grafana, Prometheus, Sidekiq, Puma, Traefik, Flask, Celery, Bonita BPM, Apache NiFi, Apache Hive, Hadoop, Presto DB, PostgreSQL, Redis, RabbitMQ, OVH, Docker, Kubernetes, Ansible Tower, Ansible, GitLab CI/CD

  • Mainframe Systems Engineer

    2013 - 2016
    BNP Paribas
    • Managed the mainframe production of the biggest European bank, built on large-scale enterprise solutions.
    • Specialized in mainframe storage, delivering high-performance, highly available, highly resilient storage arrays running mission-critical workloads.
    • Reworked the monitoring of the whole mainframe storage with IBM TDS and CA Vantage for efficient capacity planning, billing, and compliance with SLA.
    Technologies: COBOL, REXX, Shell Scripting, JCL, IBM Tivoli Storage Manager, IBM Cognos, IBM Mainframe, Enterprise, IBM Storage, Unix, z/OS, MVS

Experience

  • ConsenSys | Covantis
    https://covantis.io/

    I developed a modern digital platform based on blockchain to replace outdated, inefficient post-trade processes, minimizing operating risks and increasing market efficiency for the entire commodities trading and shipping industry.

    Core technologies include Kubernetes containerization and private Ethereum blockchains to deliver a feature-rich product while enabling CI/CD via GitLab.

  • BCG Gamma | Source AI
    https://www.bcg.com/press/9june2020-datarobot-acquires-bcg-source-ai-technology

    The development of a proprietary data science application made to easily run reproducible machine learning pipelines against various data sources.

    I leveraged containerization, Kubernetes, and Jenkins. It can run fully configurable data science pipelines in any language or framework, including Python, R, and more, versioning any element to ensure reproducibility for data, code, language, and so on.

  • Integral Ad Science | High Performance API
    https://integralads.com

    A high-performance API written in Java and Spring Boot, which was then migrated to Kubernetes clusters (AWS EKS).

    I performed an audit and correction of cluster security and high availability.

    Following GitOps practices, I implemented blue/green or canary deployment by using Flux and Flagger.

Skills

  • Languages

    Bash, Go, Java, Python, SQL, OCaml

  • Tools

    GitLab CI/CD, Jenkins, Terraform, Grafana, Ansible, NGINX, CircleCI, GitHub, Docker Swarm, Artifactory, Vault, OpenVPN, Keycloak, ELK (Elastic Stack), Ansible Tower, RabbitMQ, Apache NiFi, Bonita BPM, Celery, Traefik, Azure Kubernetes Service (AKS), Kaniko, Helm, AWS IAM, Amazon EKS, Kong, Sumo Logic, AWS CloudTrail, Istio, GitLab, Kafka Streams

  • Paradigms

    DevOps

  • Platforms

    Linux, Kubernetes, Azure, Docker, z/OS, Amazon Web Services (AWS), Unix, OpenStack, Apache Kafka, Ethereum, AWS Lambda

  • Storage

    OVH, Redis, PostgreSQL, Ceph, MongoDB, Apache Hive, InfluxDB

  • Other

    Shell Scripting, Prometheus, IBM Storage, IBM Mainframe, Engineering, Pachyderm, Consul, Okta, Puma, Orchestrate, TCP/IP, OSI Model, Cloud Security, Auditing, Octopus Deploy, Flagger, GitOps, Thanos, Scaleway, ARM, Beats

  • Frameworks

    Spark, Presto DB, Hadoop, Flask, Flux

  • Libraries/APIs

    Node.js, Sidekiq

Education

  • Engineer's Degree in Computer Science (Networks and Telecommunications Specialization)
    2006 - 2012
    ESIEE Paris - Noisy-le-Grand, France

Certifications

  • TOEIC (980/990)
    DECEMBER 2018 - PRESENT
    Wall Street English - Paris Montparnasse
  • TOEFL (590/677)
    JUNE 2009 - PRESENT
    ESIEE Paris

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