FR

Currently at Positive (Sarbacane) · Lille, France

Christophe Sieradzki

Lead Software Engineer

Distributed architecture, devops, and AI: I design reliable platforms from architecture to deployment, and help teams ship with confidence.

See my experience
Portrait of Christophe Sieradzki

01Career & education

Experience

  1. April 2025 – present

    Lead Software Engineer

    Positive

    Promoted to lead after five years at Sarbacane, I lead the Positive group’s email and SMS delivery platform, from build to day-to-day operations, with my team of engineers. I migrated our deployments from Apache Mesos to the HashiCorp stack (Nomad, Vault, Consul), brought LLMs into the moderation of outgoing campaigns (spam and fraud detection) with LangChain, and am leading the team’s adoption of coding agents (harness engineering, CI/CD automation).

    • Experience
    Show skillsHide skills17
    • HashiCorp Nomad
    • HashiCorp Vault
    • HashiCorp Consul
    • Java
    • Quarkus
    • LLM integration
    • LangChain
    • Decision models
    • Claude Code
    • RabbitMQ
    • Redis
    • MongoDB
    • Elastic Stack
    • Docker
    • GitLab CI
    • Jenkins
    • Team leadership

  2. January 2021 – April 2025

    Java Software Engineer

    Sarbacane (Positive)

    I built and ran the new contact management platform and designed the contact-list API with an API-first approach (OpenAPI). I also set up an event-sourcing architecture with CQRS, developed an asynchronous task orchestrator that works across Java and Go, redesigned the shopping cart, connected it to the internal CRM, and brought the QA team into our deployment process.

    • Experience
    Show skillsHide skills14
    • Java
    • Quarkus
    • Go
    • Event sourcing & CQRS
    • OpenAPI
    • PostgreSQL
    • MongoDB
    • Redis
    • RabbitMQ
    • Elastic Stack
    • Python
    • Apache Mesos
    • GitLab CI
    • Jenkins

  3. January 2020 – January 2021

    Junior Software Engineer

    Sarbacane (Positive)

    My first experience with microservices architecture, I maintained and extended the Sarbacane Sunrise SaaS platform (microservices architecture), improved the local development experience, and shipped key features for personalizing marketing content.

    • Experience
    Show skillsHide skills6
    • Go
    • gRPC
    • Spring
    • Angular
    • Symfony
    • MongoDB

  4. July 2019 – January 2020

    Back-end Developer

    Adictiz

    For my final-year internship, I joined the team behind the Adictiz Box, a SaaS platform that lets brands create gamified marketing campaigns. I built two new game mechanics, added OAuth authentication, documented the API with OpenAPI, and optimized the GitLab CI pipelines.

    • Experience
    • Internship
    Show skillsHide skills8
    • PHP
    • Symfony
    • MySQL
    • MongoDB
    • Docker
    • OpenAPI
    • OAuth
    • GitLab CI

  5. 2018 – 2019

    Master’s degree in Computer Science

    Université du Québec à Chicoutimi

    A one-year exchange between EIL Côte d’Opale and UQAC in Quebec: a master’s degree in computer science, earned on top of my French engineering degree.

    • Education

  6. June – August 2018

    PHP Web Developer

    Atecna

    On the maintenance team for client websites, I learned Symfony, handled client requests, and built a Vue.js tool to track them end to end. It was this internship that steered me toward back-end work.

    • Experience
    • Internship
    Show skillsHide skills3
    • PHP
    • Symfony
    • Vue.js

  7. June – August 2017

    Web Developer

    Babylon Radio

    In Dublin, I helped build Babylon Radio’s new website. It was my first web development role, working full stack: Node.js and MongoDB on the back end, Pug and Less on the front end, on the KeystoneJS CMS.

    • Experience
    • Internship
    Show skillsHide skills5
    • Node.js
    • MongoDB
    • Pug
    • Less
    • KeystoneJS

  8. 2014 – 2019

    Engineering degree in Computer Science

    EIL Côte d’Opale

    Integrated preparatory classes, then the engineering program, majoring in computer science. French engineering degree (master’s level), awarded in 2019. Student organization president of Ch'ti Gamers 2017 - 2018

    • Education

02Areas of expertise

Skills

  • Languages & frameworks

    • Java
    • Quarkus
    • Spring
    • Go
    Also
    • Python
    • PHP / Symfony
    • Node.js
    • Angular

  • Technical leadership

    • Team leadership
    • Project delivery
    • Scrum
    • Developer experience (DX)

  • Architecture

    • Microservices
    • Event sourcing & CQRS
    • API-first (OpenAPI)
    • gRPC
    • RabbitMQ

  • Platform & delivery

    • HashiCorp Nomad · Vault · Consul
    • Docker
    • CI/CD (GitLab CI, Jenkins)
    Also
    • Kubernetes
    • Apache Mesos

  • Applied AI

    • LLM integration
    • Decision models
    • LangChain
    • Claude Code

  • Data & observability

    • PostgreSQL
    • MongoDB
    • Redis
    • Elastic Stack
    Also
    • MySQL

03Let’s talk

Contact

Have a question, an opportunity, or just want to chat? Drop me a line.

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