Geoffroy Planquart, Developer in Strasbourg, France
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Geoffroy Planquart

Verified Expert  in Engineering

Software Architecture Developer

Strasbourg, France
Toptal Member Since
April 28, 2021

Geoffroy is a software developer who specializes in back-end development using Ruby, with or without the Rails framework, which he used to develop a custom-made ERP for a long-term project. He's also a proficient C++ developer able to write high-quality code.


Git, Ruby, Software Architecture, Linux, Ruby on Rails (RoR), JavaScript, Vue...
IT-CE (Informatique et Technologies - Caisse d'Epargne
C++, Visual Studio, Software Architecture, Security, Cryptography
C++, C, Java Native Interface (JNI), Java, Android, iOS, Objective-C, C#...




Preferred Environment

Vim Text Editor, Git, Linux, Ruby, C++

The most amazing...

...thing I've done is developing a natural language generator in Ruby for Epopia, an edtech startup. I also coded the whole security layer of ATM software in C++.

Work Experience

CTO | Co-founder

2012 - 2019
  • Designed and developed the application suite used by the company, including a web front-end and the specialized interfaces for the different lines of business, including redaction, integration, and stock management.
  • Wrote a natural language generator to replace complex patterns with the right content while taking care of the necessary declensions in French.
  • Integrated the company's system with the subcontractor's IT system.
  • Connected the application stack to several services, including GitLab, internal emailing, and customer care software.
Technologies: Git, Ruby, Software Architecture, Linux, Ruby on Rails (RoR), JavaScript, Vue, Unit Testing, Functional Testing, MongoDB, Redis, Elasticsearch, Beanstalkd, C, Continuous Integration (CI), Continuous Deployment, GitLab, GitLab CI/CD, Ruby Gems, Security

Programmer Analyst

2014 - 2014
IT-CE (Informatique et Technologies - Caisse d'Epargne
  • Rewrote the security layer of ATM software from scratch, ensuring the cryptographic security of the transactions.
  • Integrated an existing team for the maintenance and evolution of software.
  • Took part in the designing phase of a brand-new version of the application, including making architectural decisions.
Technologies: C++, Visual Studio, Software Architecture, Security, Cryptography

Programmer Analyst

2011 - 2014
  • Created a cross-platform location-based augmented reality framework for mobile supporting Android, iPhone, and Windows Phone.
  • Contributed to the research and development effort to provide image processing capabilities to the framework.
  • Implemented the low-level functionalities in a library with the necessary bindings to be used on all the target platforms.
Technologies: C++, C, Java Native Interface (JNI), Java, Android, iOS, Objective-C, C#, Windows Phone, Mobile Apps, Augmented Reality (AR), iPhone

Software Developer

2006 - 2012
  • Developed a web application to showcase the clients' services.
  • Created a Linux daemon to track GPS data from hundreds of vehicles.
  • Analyzed the client's needs and proposed adequate solutions.
Technologies: HTML, CSS, JavaScript, PHP, C++, Linux

Hydroponic Mongo
Hydroponic Mongo is a Ruby gem aiming to mock a MongoDB connection that can test a Ruby application without running an actual MongoDB server, thus speeding the operations. It provides support for the basic CRUD operations.
2009 - 2014

Master's Degree in Computer Science

SUPINFO International University - Strasbourg, France


Neo4j Certified Professional

Neo4j, Inc.


Vue, Mongoid


Vim Text Editor, Git, GitLab, GitLab CI/CD, Visual Studio


Ruby, C++, JavaScript, C, Cypher, Java, Objective-C, C#, HTML, CSS, PHP


Unit Testing, Functional Testing, Continuous Integration (CI), Continuous Deployment


Ruby on Rails (RoR)


Linux, Android, iOS, Windows Phone


MongoDB, Redis, Elasticsearch, Neo4j, Graph Databases


Software Architecture, Beanstalkd, Ruby Gems, Security, Cryptography, Java Native Interface (JNI), Mobile Apps, Augmented Reality (AR), iPhone

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