Pierre Fersing
CTO & Co-founder at Bleemeo
Toulouse, Occitania, France
Summary
🤩
Rockstar🎓
Top SchoolPierre Fersing is a seasoned engineering leader and CTO with 18 years of experience building reliable, production-grade backend systems and observability tooling from Toulouse, France. As co-founder and CTO of Bleemeo since 2015, he blends hands-on development with product and operational ownership, informed by prior systems and network administration at Sierra Wireless. A regular open-source contributor, Pierre has improved core observability and messaging projects — notably Prometheus procfs, InfluxData’s Telegraf, and the Eclipse Mosquitto MQTT stack — delivering fixes, performance optimizations, and robustness improvements. His contributions show a practical focus on metrics, resilience, and testing: adding new procfs metrics, hardening MQTT websocket behavior, and implementing circuit breakers and better timeout handling across inputs. Comfortable across DevOps, backend engineering and QA, he also brings pragmatic automation skills (Dockerized test environments, installer/service improvements) that help bridge development and operations. Colleagues would describe him as a detail-oriented problem solver who turns low-level systems knowledge into dependable, observable services.
18 years of coding experience
ENSEEIHT
Github Skills (62)
procfs10
circuit10
monitoring10
caching10
kubernetes10
debug10
authorizations10
docker10
pytest10
envoyproxy10
python10
redis10
back-end-development10
mysql10
circuit-breaker10
Programming languages (8)
Github contributions (5)
jpmens/mosquitto-auth-plug
Jul 2015 - May 2018
Authentication plugin for Mosquitto with multiple back-ends (MySQL, Redis, CDB, SQLite3)
Role in this project:
Back-end Developer
Back-end DeveloperContributions:16 commits, 14 PRs, 5 comments in 2 years 9 months
Contributions summary:Pierre primarily focused on improving the authentication and authorization mechanisms within the Mosquitto MQTT broker plugin. Their contributions included fixing issues related to caching, such as expired cache entries and double-freeing objects. Furthermore, they added the ability to quiet logging and incorporated retry logic for HTTP backend connections. They also worked on error handling, returning MOSQ_ERR_UNKNOWN when backend services were unavailable.
redismosquittomysqlauthenticationsqlite3
eclipse-paho/paho.mqtt.python
Jul 2016 - Jul 2020
paho.mqtt.python
Role in this project:Back-end Developer
Back-end DeveloperContributions:3 releases, 56 reviews, 149 commits in 4 years 1 month
Contributions summary:Pierre Fersing primarily focused on bug fixes and improvements related to the core functionality of the `paho.mqtt.python` library. His contributions involved addressing issues in Python 3 compatibility with QoS levels, enhancing WebSocket connection stability by preventing indefinite hangs and implementing retry mechanisms, and correcting issues with publish.single/multiple helper functions. He also worked on fixing various issues including handling for large payloads over websockets. These contributions improved the reliability and functionality of the MQTT client library.
pythonpahoeclipseiotpaho-mqttmqtt
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