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Lead Developer · France

Zacaria Chtatar

API platforms, distributed systems, and technical strategy.

Software engineer since 2013, with lead roles since 2018. I connect architecture, API performance, operational evidence, and delivery practices to product needs and engineering constraints.

Zacaria Chtatar
01 · Profile

At a glance

  1. 2013career start

    Software engineering across web products, public APIs, and distributed systems.

  2. 10M → 25M req/dayscale to support more traffic

    Observed production traffic, supported by route-level observability, load testing, and profiling.

  3. 24h → 15mupdate visibility

    Event-driven, dependency-aware refresh made data updates visible sooner.

  4. 955TOEIC English

    Delivered an English-language talk at API Days Paris.

02 · Chronology

Work experience

Club Med

2020.09 ~ nowLead Developer

Public API platform supporting Club Med’s digital ecosystem

Platform architecture & technical leadership

2020.09 ~ now

Architecture and team practices for a public API platform.

  • Contributed to architecture choices and API contracts for Club Med’s public API platform.
  • Clarified trade-offs across engineering, product, and business stakeholders, and improved onboarding through clearer contracts and shared standards.
Technical strategyAPI contractsTeam enablementNode.js

API performance & event-driven systems

2021.09 ~ now

Observability and targeted cache refresh for a high-volume API platform.

  • Helped scale Club Med’s public API platform to support observed production traffic from approximately 10M to 25M requests per day through route-level Kibana observability, load testing, and profiling.
  • Designed and implemented dependency-aware Kafka refreshes with a Rust service, reducing the wait to see updates from 24 hours to 15 minutes.
Node.jsKibanaKafkaRustRedis

AI-assisted delivery

2025.09 ~ now

AI tooling used as a controlled team workflow.

  • Introduced Spec-Driven Development with OpenSpec during a hackathon; adoption accelerated afterward.
  • Created MCP access to API documentation and logs so coding agents receive controlled project context.
OpenSpecCodexMCPSpec-Driven DevelopmentAI SDK

Figaro Classifieds

2018.09 ~ 2020.09Node.js Lead Developer

Property platforms within the Figaro media group

Modernizing property platforms

2018.09 ~ 2020.09

Modernized frontend, backend, delivery, and cloud foundations across two products.

  • Led a Backbone and JSP migration to Vue.js with server-side rendering.
  • Improved SEO and user experience while modernizing build and delivery practices.
  • Built Node.js and Go services and configured a GCP CDN with Terraform.
Node.jsVue.jsReactGoTerraformGCP

DirectSkills

2018.05 ~ 2018.08React Tech Lead

Software for temporary-employment management

Modernizing frontend delivery

2018.05 ~ 2018.08

A short engagement combining delivery and team enablement.

  • Led React interface delivery in a complex human-resources domain.
  • Modernized frontend practices and tooling.
  • Trained teammates on the React ecosystem.
ReactGraphQLApolloSassScrum / Kanban

Excilys (now Oxyl)

2016.06 ~ 2018.05React Developer

Consulting across private-banking and marketplace products

Mirakl — French unicorn

2017.02 ~ 2018.01

Marketplace SaaS platform

  • Established React and Redux practices, maintained a component library, and industrialized delivery with CircleCI and Lerna.
  • Trained Java developers moving to React and helped a seven-person team restore professional collaboration.
ReactReduxStorybookCircleCILernaTeam enablement

Airfund

2018.02 ~ 2018.05

Private-banking product

  • Built React components integrated with a GraphQL API and improved Apollo client performance.
  • Facilitated Scrum practices for the client team.
ReactApolloGraphQLSassScrum / Kanban

Earlier engineering experience

2013.06 ~ 2016.09Software Engineer & Web Developer

Keyveo, CESI, Excilys training, and early client work

Engineering foundations

2013.06 ~ 2016.09

Early work across documentation tooling, IoT, mobile, and web products.

  • Completed six weeks of intensive software-engineering training and earned Oracle OCA and OCP certifications.
  • Built TypeScript-to-Markdown tooling for the Babylon.js documentation.
  • Visualized IoT sensor data for the CESI CREST research project and delivered early web and mobile client products.
JavaNode.jsTypeScriptJavaScriptIoTMobile
03 · Scope

Technical leadership & systems scope

Technical leadership

  • Technical strategy and decision framing
  • Architecture and API contracts
  • Team enablement and onboarding
  • Communication across technical and business audiences

Systems

  • Public APIs at scale
  • Performance and observability
  • Event-driven architecture
  • Distributed caching and data freshness

Delivery

  • Spec-Driven Development
  • Test-Driven and Domain-Driven Development
  • CI/CD and infrastructure as code
  • AI-assisted engineering workflows

Languages & credentials

  • English — TOEIC 955
  • Hugging Face AI Agents Certification, 2024
  • AWS Certified Cloud Practitioner, 2019
  • Oracle OCA and OCP

Selected technologies

Node.jsTypeScriptRustKafkaRedisReactKibanaDockerAWSTerraform
04 · Beyond work

Beyond the role

API Days 2023

Video
2023.12.06 ~ 2023.12.08Speaker

English-language talk on building robust, fast, cost-efficient APIs with Rust.

Public speakingRustAPI architecture

European Innovation Academy

2023.07 ~ 2023.08Technical lead — MyTurn

Three-week entrepreneurship programme in Porto; led technical and architecture decisions for the MyTurn product concept.

EntrepreneurshipCustomer discoveryPrototypingPublic speaking

Applied Quantum Computing

2022.07 ~ 2022.07Hogeschool van Amsterdam

Two-week intensive programme completed with a score of 10/10; implemented BB84 quantum key distribution and qubit teleportation with Qiskit.

Quantum computingPythonQiskit

CESI Exia

2011 ~ 2016Manager des systèmes d’information — French Bac+5

Five-year project-based programme completed at French Bac+5 level.