Expériences — Julien Crestin

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Resume created on DoYouBuzz

Experiences

PostgreSQL & Rust micro-services development
Infrastructure automation with Kubernetes, Terraform, Istio, GCP, ... (provisioning, monitoring, alerting, deployment, ...)
Angular (11) application development (RxJS, NgRx)
PostgreSQL optimizations & training

PaaS creation with: AWS, Terraform, Terratest, Kubernetes, Helm (v3), Packer, Prometheus, Grafana, Kibana, Fluent, Jaeger, Istio, OpenEBS, Velero, ...
Disaster Recovery plan creation/automation: rollup of the whole infrastructure every 4 months, definition of SLI/SLO
Security improvments: setup of security audits and policies, rework on the authorisation/authentication flows, ...
CI/CD setup with Gitlab and Kubernetes. Setup of e2e testing with Cypress.
Migration to an event-driven architecture, backed by RabbitMQ
Major productivity increase in the backend team, with instant creation of GraphQL APIs with PostGraphile

traveloffers.email: platform to suggest cool destinations when price are abnormally low, or in your budget. (AWS Lambda, NodeJS, DynamoDB)
labonnealerte.com: be alerted in real time when a new offer match your criteria on leboncoin.fr (AWS Lambda, NodeJS, React, PostgreSQL)
mondossierlocation.fr: manage your potential tenant files easily (not released yet) (PostGraphile, React, PostgreSQL)

Redesign of microservices architecture (Kotlin, Spring Boot 2, PostgreSQL, MongoDB)
Setup of the monitoring, logging and tracing stack
Migration toward an event driven architecture based on Kafka
Migration from VPS to IaaS on AWS/Azure with Kubernetes & Terraform

Management of 7 developers
Architecture & Conception
Redesign of the real-time communication stack (XMPP, Erlang, Bots, Scala, RabbitMQ)
Migration to public cloud (AWS)

Integration of messaging features (social network)
Redesign of XMPP stack
Micro-services architecture (NodeJS, Scala, ReactJS)
Scala
(API) - TypeScript/NodeJS (workers/services)
ReactJS (front)
Elasticsearch, PostgreSQL, Redis

Development of a real time analysis tool (NodeJS)
Set up of an Elasticsearch cluster, and definition of data strategy to provide a real-time dashboard
Development of a social network management API (Scala/Play)

Development of the social metrics gathering tool
Scala, Play framework, AngularJs, ...

ECM (Alfresco)
J2EE (Spring, Struts, WebLogic)
Maintenance of an ECM application, for a French insurance company

Development around Elgg platform
Apache Solr integration
Set up of a streaming service (Red5)

Modules development to integrate Elgg news feed into Seesmic Desktop 2 (PHP 5, Silverlight/C#, XAML)
Modules development to integrate Elgg news feed into Netvibes (PHP 5, JavaScript)