Nicolas Le Manchet, Developer in Warsaw, Poland
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Nicolas Le Manchet

Verified Expert  in Engineering

Software Developer

Warsaw, Poland
Toptal Member Since
July 24, 2018

Nicolas is an experienced Python developer who enjoys writing back-end code with Django and Flask. Having worked as a DevOps for a large Cloud provider as well as smaller startups in different countries, he likes helping teams of all horizons to build reliable infrastructure.


Open Tender
Amazon Web Services (AWS), CircleCI, Docker, Ansible, MySQL, Flask, Python
Continuous Delivery (CD), Celery, SQLAlchemy, Flask, Python
Ansible, Puppet, Docker, Celery, SQLAlchemy, Flask, Python




Preferred Environment

Docker, PyCharm, Rust, Python 3, Debian

The most amazing...

...project I've built is a service that helps deploy OpenStack clusters made of thousands of servers.

Work Experience

Back-end Developer

2018 - 2020
Open Tender
  • Designed and developed a REST API replacing the legacy server-side rendered forms.
  • Designed a point-of-sales system with bidirectional synchronization of orders between restaurants and the cloud SaaS application.
  • Established a continuous deployment strategy using GitHub, CircleCI, Docker, and AWS ECS to deploy the main SaaS application.
  • Built the integration with third-party services (payment, CRM, and loyalty programs).
  • Migrated the application from Python 2.7 to Python 3.
  • Integrated asynchronous tasks using Celery, improving the latency of the web application.
Technologies: Amazon Web Services (AWS), CircleCI, Docker, Ansible, MySQL, Flask, Python

Back-end Developer

2016 - 2018
  • Wrote and maintained a REST API in Flask with Celery background tasks handling hundreds of requests per second.
  • Improved performances by switching from a pull-based approach to a push one for external services.
  • Improved application latency by profiling and rewriting SQL queries as well as tuning MySQL.
  • Tracked down and reduced memory leaks in Python applications.
  • Migrated existing codebases from Python 2 to Python 3.
  • Provided long-term maintenance of a core service in a microservices architecture.
  • Improved the continuous delivery workflow with GitLab CI and Docker containers.
Technologies: Continuous Delivery (CD), Celery, SQLAlchemy, Flask, Python

DevOps Engineer

2014 - 2016
  • Developed REST APIs in Flask that help deploy large OpenStack clouds.
  • Provisioned the server with Puppet and Ansible.
  • Wrote an API to automate the creation and signature of SSL certificates used by Puppet to authenticate hosts.
  • Monitored large-scale infrastructure with Shinken.
  • Deployed production using Docker containers on Apache Mesos.
Technologies: Ansible, Puppet, Docker, Celery, SQLAlchemy, Flask, Python

Open Tender/Brandibble
Participated to the development of an integrated solution for restaurants providing online ordering, point-of-sales, kitchen display system, API and the integration with dozens of third-party systems.

Contributed with a team of 20 developers to the back-end running the application for outbound sales.

OVH Public Cloud

Built the OVH public cloud based on OpenStack as part of a global team. I delivered internal tools for provisioning large clusters of dedicated servers. Completed server configuration with Puppet, automated operating system image building, and oversaw monitoring.

This is an open-source RSS feed reader written in Python 3 with Django. I created asynchronous fetch of feeds with background tasks, deployed to production using Docker containers, automated with Ansible, and built the front end using the Bulma CSS framework. I used Django static assets served with Caddy and ensured security using HTTPS with Let's Encrypt, HSTS.

Maintainer of IMAPClient, a popular Python library for interacting with email servers.

I fixed issues related to SSL/TLS connections on different versions of Python. Improved the code base by refactoring aging parts. Added support for newer RFCs related to IMAP and improved documentation.

A library providing an on-disk sorted data structure that implements the same interface as Python dicts.

I used a B+ tree for efficient look-ups and traversals, a Write Ahead Log (WAL) for transaction management and Atomicity, supported arbitrary large values using linked overflow pages, and delivered an extensive test suite.

Lightweight engine for background tasks using Redis as an alternative to the popular Celery.

I created supports for at-least-once or at-most-once delivery per task, periodic tasks without an additional process, the scheduling of tasks in batches, embeddable workers for easier testing, first-class support for Python threads, and an extensive test suite.
2011 - 2014

Engineering in Systems, Networking and Telecommunication

University of Technology of Troyes - Troyes, France

2010 - 2011

University of Technology Diploma (DUT) in Networking and Telecommunication

University of Clermont-Ferrand - Clermont-Ferrand, France


REST APIs, Asyncio, SQLAlchemy, Requests


Celery, Ansible, Git, Sentry, Puppet, PyCharm, CircleCI, RabbitMQ, NGINX, Caddy Server


Flask, Django, Django REST Framework, Bulma


Python, HTML, Python 3, Lua, Rust, CSS


Docker, Debian, Amazon Web Services (AWS), OpenStack


PostgreSQL, Redis, MySQL, Memcached


Microservices, Continuous Delivery (CD), Refactoring


Processing & Threading, Gunicorn, Sales, HTTPS, Security, RSS Feeds, IMAP, Request for Comment (RFC), SSL, Nomad

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