Hi! I'm Antoine Merino

I live in Valence (France), currently working in Paris as a software engineer. I mainly do backend development. I try to contribute modestly to open-source projects in my free time.

Feel free to connect with me on LinkedIn. Please add a note so I don't mistake you for a bot or a random recruiter.

Skills and Experience

• Domains: Software design and architecture, development, testing, CI/CD
• Languages: Python, C++, C, Java, HTML/CSS
• Databases: MariaDB, MySQL, AWS RDS, PostgreSQL, SQL DB optimization (indexing, normalization, deadlock mitigation), MongoDB, AWS DocumentDB, Redis
• Other: Memcached
• DevOps/Infra: Docker, Ansible, Ubuntu/Debian server, Kibana, Grafana
• Platforms: Windows, macOS, Linux, Android, Embedded systems & Microcontrollers
• Other: electronics, photovoltaics, car mechanics

Some open-source contributions

Code

C++

• ZXing-CPP: Barcode image processing library. Added support for reading DX Film Edge barcodes on 35mm films. [Ticket]

C

• Zint: Barcode generation software. Added support for generating DX Film Edge barcodes. [Ticket]

Python

• Paperless-ngx: A Django-based document management system that scans, performs OCR, organizes, and enables full-text search of documents. Worked mainly on performance improvements (full list), including:

  • Faster page loading by eliminating N+1 queries [PR]
  • Faster classifier training and predictions [PR]
  • Faster date parsing [PR]
  • Database read-caching [PR]
  • Database connection pooling [PR]

• Limits: Rate limiting library used by famous frameworks (Flask, FastAPI / Starlette...):

  • Implemented the sliding window counter algorithm, a memory-efficient approximation of the moving window algorithm. Supported backends: RAM, Redis and Memcached. The author added support for MongoDB. [Ticket]
  • Improved Memcached backend's performance.
  • Fixed a race condition issue in RAM backend.

• Flask-Pydantic: Flask (web framework) extension to integrate with Pydantic (data validation library). Added backward compatibility with Pydantic V1. [Ticket]

• FastAPI-MVC: FastAPI (web framework) project generator. Fixed installation failure with Python versions 3.10 and above. [Ticket]

• Freqtrade: crypto trading bot. Added weekly and monthly reports on Telegram. [Ticket]

Issues raised

• Graby: Web page content extractor used by Wallabag. Asked for support for a two-step login. [Help needed!]
• Koreader: Ebook reader application. Found a bug due to a misleading French translation. [Issue]
• python-jose: JOSE python library. Vulnerability not fixed in a dependency. [Issue]
• pypdf: Python PDF library. Found a bug where PDFs were not merged correctly after an update. [Issue]
• pur: Python package update tool. Asked for a dry mode that can list packages to be upgraded. [Issue]
• pydantic-i18n: Internationalisation for Pydantic error messages. Found an issue with static code typing. [Issue]

Current projects

• The Big Film Database: a website for exploring the largest open-source database of 35mm photographic films.

Past projects

• Flexible Flight Search: find cheap round-trip flights with more flexible dates than online flight comparators.
• eBay announce generator: personal template for pretty eBay listings.
• Rocksmith profile sync: Sync your Rocksmith 2014 profile across multiple machines.