Pau Freixes
Staff Software Engineer at Nango
Barcelona, Catalonia, Spain
Summary
🤩
Rockstar🎓
Top SchoolPau Freixes is a Staff Software Engineer with 11+ years building and operating large-scale, distributed systems from first principles to global production, most recently owning GitHub’s asset storage pipelines and ElasticSearch fleets and now at Nango. He blends deep hands‑on expertise in async Python, gRPC, and storage technologies with a strong SRE mindset—capacity planning, zero‑downtime upgrades, and multi‑region/cloud failover are recurring themes in his work. Pau has a track record of improving core open-source projects (official committer roles on gRPC and aiohttp) and shipping high‑impact library fixes and performance optimizations that touch millions of users. He led platform redesigns at Auth0 that replaced synchronous critical‑path calls with in‑memory evaluation and a custom gRPC replication protocol, materially improving latency and resilience. Comfortable across languages and stacks—from C and low‑level concurrency to Go and Kubernetes—he favors readable, well‑tested code and pragmatic architecture choices. Based in Barcelona, he pairs a researcher’s curiosity with operator discipline, often surfacing non‑obvious reliability gains through protocol and tooling changes.
11 years of coding experience
23 years of employment as a software developer
UPC Universitat Politècnica de Catalunya
English
Stackoverflow
439reputation
173kreached
20answers
3questions
Github Skills (53)
aiohttp10
javascript10
middleware10
c-language10
buffer10
buffering10
pytest10
python10
apidoc10
redis10
testing10
connect10
connections10
http10
aioredis10
Programming languages (10)
Github contributions (5)
aws/aws-xray-sdk-python
Mar 2018 - May 2018
AWS X-Ray SDK for the Python programming language
Role in this project:
Back-end Developer
Back-end DeveloperContributions:6 commits, 8 PRs, 23 comments in 2 months
Contributions summary:Pau primarily contributed to the `aws-xray-sdk-python` repository by enhancing its Aiohttp integration. They updated the middleware to use the official Aiohttp pattern and fixed issues with URL serialization. Furthermore, the user implemented support for Aiohttp client tracing, enabling subsegment creation for outgoing HTTP requests within aiohttp sessions. They also addressed a bug that handled exceptions and errors and added a setting to handle missing segments.
python-programmingraypythonsdkaws
aio-libs/aiohttp
Jul 2016 - May 2018
Asynchronous HTTP client/server framework for asyncio and Python
Role in this project:Back-end Developer
Back-end DeveloperContributions:28 commits, 41 PRs, 42 pushes in 1 year 9 months
Contributions summary:Pau primarily contributed to the `aiohttp` project, focusing on improving the internal workings of the HTTP client/server framework. Their work involved refactoring and enhancing the TCP connector's DNS caching mechanism, including adding features like TTL management and DNS request throttling. They also implemented client-side signal enhancements, such as tracing capabilities, to allow users to better monitor the request lifecycle. Furthermore, the user addressed several bugs related to HTTP pipelining and content type handling.
pythonasynchronousasynciohttp-clientclient-server
Find and Hire Top DevelopersWe’ve analyzed the programming source code of over 60 million software developers on GitHub and scored them by 50,000 skills. Sign-up on Prog,AI to search for software developers.