Son Nguyen Kim, Developer in Paris, France
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Son Nguyen Kim

Verified Expert  in Engineering

Machine Learning Developer

Paris, France
Toptal Member Since
June 17, 2015

Son is highly skilled with software engineering and ML algorithms, and always tries hard to tackle problems with a simple yet efficient approach, making the code maintainable in the long run. As an entrepreneur, he is devoted to his work and understands fully the importance of responsibility and proactivity. He can communicate efficiently with both business and technical sides.


Amazon Web Services (AWS), Vue, Ansible, Postfix, Python
Croscon (via Toptal)
JavaScript, Flask, Python
Amazon Web Services (AWS), Apache Kafka, Docker, Python




Preferred Environment

Android Studio, Xcode, PyCharm, Git

The most amazing...

...thing I've developed is a platform where people can meet, discuss, and share what they know to solve problems.

Work Experience


2019 - PRESENT
  • Created a popular open-source email alias service that protects your email address.
  • Developed an OAuth identity provider that offers a privacy-focused "Login with Facebook/Google/Apple" button.
  • Built a Chrome/Firefox extension that allows the user to quickly create email aliases.
  • Coordinated a developer team to work on different platforms, including web, iOS, and Safari.
  • Handled customer support and managed the open roadmap.
Technologies: Amazon Web Services (AWS), Vue, Ansible, Postfix, Python

Software Developer

2019 - 2019
Croscon (via Toptal)
  • Added features to GemSafe, an insurance company.
  • Moved the deployment to use Docker-compose.
Technologies: JavaScript, Flask, Python

Director of Engineering

2018 - 2019
  • Led an agile team of six developers.
  • Architected the back end and infrastructure for B2B product with big-name clients and a strong emphasis on security.
Technologies: Amazon Web Services (AWS), Apache Kafka, Docker, Python

Software Architect

2017 - 2018
  • Designed, implemented, and deployed reliable components based on Docker, hosted on AWS.
  • Participated in cross-team efforts to troubleshoot/determine the resolution for complex issues.
  • Integrated all work into our CI/CD pipeline so as to repeatably and reliably deliver updates to all environments, including production.
Technologies: JavaScript, Python, Apache Kafka, Docker


2016 - 2018
  • Led the tech team to create iOS, Android, and web apps.
  • Created and maintained the back end.
  • Managed content writers.
Technologies: React, Python, iOS, Android

Software Engineer

2016 - 2017
Tulane University (via Toptal)
  • Created an internal tool that allows teachers and students to get information about their courses.
  • Added an export PDF feature: Users can export a given course into a PDF file.
Technologies: Canvas, Python, C#

Software Developer

2016 - 2017
Kizen (via Toptal)
  • Added new features to the Kizen CRM.
  • Optimized code processes.
Technologies: PostgreSQL, AngularJS, Django

Back-end and Machine Learning Developer

2016 - 2017
  • Created an algorithm that provides personalized movie recommendations.
  • Used a third-party API to collect movie data.
  • Created and maintained the back end used by the app to provide Facebook and Twitter logins and save user interactions.
Technologies: Amazon Web Services (AWS), Scikit-learn, Python

Freelance Developer

2015 - 2017
University of Wisconsin – Madison (via Toptal)
  • Built up a crowd-sourced "reverse engineering" tool to understand microtargeting in political campaigns.
  • Created and maintained the back end that receives and stores up to millions of ads.
  • Created an admin interface to facilitate analysis work.
  • Created algorithms to detect whether an ad is political and predict the candidates, the party supporting them, and more.
Technologies: Amazon Web Services (AWS), MySQL, Python


2014 - 2017
  • Defined and put in place software architecture and infrastructure.
  • Created a REST API written in Python/Flask supporting heavy traffic.
  • Created 3D native viewers for Android and iOS.
  • Managed the R&D team.
  • Created the ML stack to handle clothes recommendations.
Technologies: Amazon Web Services (AWS), 3D, iOS, JavaScript, Android, Python

Freelance Python and iOS Developer

2015 - 2015
28 Billionaires (via Toptal)
  • Crawled workout products to get ingredient information such as protein quantity, sugar, etc. and saved them into a Parse database.
  • Created v1.0 of the iOS app that compares workout products using the above database.
Technologies: Scrapy, Swift, Python

Software Engineer

2012 - 2014
  • Developed a feature selection tool which aims at choosing automatically relevant features for a prediction algorithm. The tool enables the amelioration of the predictions' performance, reduces manual selections, and constitutes an important step in the model optimization process.
  • Developed a historical metrics feature to keep track of, detect, and quickly analyze the predictions' quality.
  • Implemented unit and integration (Selenium) tests to cover the predictions' critical code.
  • Modeled and optimized algorithms for new business models.
  • Resolved the latency problem of this new business model.
Technologies: AngularJS, Hadoop, Java, C#


2011 - 2012
Bell Labs
  • Developed a PageRank simulator in Swing.
  • Studied possible extensions of PageRank and their relevance in comparison to classic metrics such as H-Index, G-Index, PR-A.
  • Implemented the new algorithm in the author and paper graph issued from DBLP (about 70,000 authors and 1.7 million papers).
  • Contributed to the article "Publication Induced Research Analysis (PIRA) - Experiments on Real Data."
  • Implemented Maven to better handle Java projects in the team.
Technologies: Neo4j, Swing, Java

Password manager for emails. SimpleLogin is an open source email alias solution to protect your email address.

Ban Co Biet (Do You Know?)

"Ban co biet" (available in Vietnamese) is an Android, iOS, and web application that brings believable stories with proven sources to users. No more fake stories and Photoshop shocking pictures.

Flickle - Movie Recommendations

Provide personalized movie recommendations.

A handy viewer for Android SMS backup apps like SMSBackupRestore.


Vloupe is a platform where people can meet, discuss, and share what they know to solve problems.

Vloupe is created with AngularJS on the front and Python/Flask on the back-end.

Dudoanbongda (Football Score Prediction)

A web app that allows users to predict Euro 2016 scores.

Functionalities: private/public competition group, user ranking, scores updated in real time using a third-party API.

A small Node.js server returning the country, region, and city in the function of the user's IP.

Presentation of Node.js for VN-INFO Group
The slides of the presentation can be found at:

A small web app to keep track of your jogging sessions and see your performance statistics.
2010 - 2011

Master of Science Degree in Parallel Computing

Telecom - Paris, France

2007 - 2011

Master of Science Degree in Computer science

Ecole Polytechnique - Ile-de-France, France


SQLAlchemy, React, Scikit-learn, NumPy, Vue


Git, PyCharm, Microsoft Visual Studio, IntelliJ IDEA, Xcode, Android Studio, Canvas, Postfix, Ansible


Flask, Django, ASP.NET MVC, Hadoop, AngularJS, Swing, Scrapy


Java, Python, Swift, C#, JavaScript


Agile Software Development, Concurrent Programming, Test-driven Development (TDD)


Docker, Android, Apache Kafka, iOS, Amazon Web Services (AWS)


MySQL, Databases, SQLite, Microsoft SQL Server, Neo4j, PostgreSQL, MongoDB


Architecture, Security, Machine Learning, 3D Rendering, 3D

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