Julien Crestin
Site Reliability Engineer
Freelance - Software engineer / SRE
Netwo
Since December 2020
- 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
Lead SRE / Backend engineer
Sterblue
May 2019
to December 2020
Nantes
France
- 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
SaaS attempts
free time
Since April 2018
- 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)
Lead Back-end Developer / Ops
EP
September 2017
to May 2019
- 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
Lead Developer
iAdvize
July 2016
to September 2017
- Management of 7 developers
- Architecture & Conception
- Redesign of the real-time communication stack (XMPP, Erlang, Bots, Scala, RabbitMQ)
- Migration to public cloud (AWS)
Full-Stack Developer
iAdvize
January 2015
to June 2016
Full-time
Nantes
France
- 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
Full-Stack Developer
Bringr
September 2014
to March 2016
Full-time
Nantes
France
- 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)
Full-Stack Developer
Bringr
October 2013
to September 2014
Internship
Nantes
France
- Development of the social metrics gathering tool
- Scala, Play framework, AngularJs, ...
Analyst
CGI
October 2012
to September 2013
Cooperative Education Work
Nantes
France
- ECM (Alfresco)
- J2EE (Spring, Struts, WebLogic)
- Maintenance of an ECM application, for a French insurance company
Elgg Developer
Human Connect
August 2011
to September 2012
Apprenticeship
Nantes
France
- Development around Elgg platform
- Apache Solr integration
- Set up of a streaming service (Red5)
Développeur
Human Connect
January 2011
to February 2011
Internship
Nantes
France
- 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)
- Scala / Kotlin / NodeJS
- Akka / Play / Spring Boot / NextJS
- SQL
- React
- GraphQL
- Kubernetes/Docker
- AWS/Azure
- CI/CD (Jenkins/Gitlab CI/Circle CI)
- Automation
- Elasticsearch
- Redis
- PostgreSQL / MySQL
- MongoDB
- English : fluent
- French: native
Algorithm Design and Analysis
Concurrent and Parallel Programming
Communication Security
Collaborative Distributed Systems (Cloud Computing)
Information Retrieval and Web Search
Concurrent and Parallel Programming
Communication Security
Collaborative Distributed Systems (Cloud Computing)
Information Retrieval and Web Search
Application development (Algorithms, OOP, ...)
Project management (financial analysis, english, communication, planning, human resources)
Data management (SQL, NoSQL, data modeling, data quality)
System & Network Infrastructure (networking, virtualization, security)
General education (maths, economy, english, ...)
Secretary then Vice-Président of Students Union
President of linux internal lab, EPSINux
Technique d'Expression et de Communication
Droit
C++
Java
Techniques quantitatives de gestion
Réseau
SGBD
UML
Mathématiques, Mathématiques Appliquéss
Théorie des systèmes, Unix
Anglais
Project management (financial analysis, english, communication, planning, human resources)
Data management (SQL, NoSQL, data modeling, data quality)
System & Network Infrastructure (networking, virtualization, security)
General education (maths, economy, english, ...)
Secretary then Vice-Président of Students Union
President of linux internal lab, EPSINux
Technique d'Expression et de Communication
Droit
C++
Java
Techniques quantitatives de gestion
Réseau
SGBD
UML
Mathématiques, Mathématiques Appliquéss
Théorie des systèmes, Unix
Anglais
BTS informatique de gestion option développeur d'applications, major académie de Nantes
EPSI Nantes
September 2009
to June 2011
Web, Anglais, Mathématiques, Algorithmique, SGBD, Réseaux, Techniques de Communication, Gestion, Droit, Economie d'Entreprise, Economie Générale.
Baccalauréat S spécialité mathématiques, mention très bien, mention européenne
Lycée Sainte Agnès
September 2006
to June 2009
