Jonathan Lange
Principal Software Engineer at Chainguard
London, England, United Kingdom
Summary
🤩
Rockstar🎓
Top SchoolJonathan Lange is a Principal Software Engineer based in London with over two decades of experience blending hands-on backend, infrastructure and data engineering with technical leadership and management. He has progressed from deep engineering roles (Twisted, ClusterHQ) to senior leadership at Weaveworks and Memrise and now Chainguard, consistently focusing on reliability, observability and scalable systems. A prolific open-source contributor, his work spans Python, Haskell and Go ecosystems — notably contributions to Twisted, the Servant Haskell library and Prometheus-aligned Cortex — showing expertise in API design, testing infrastructure and logging systems. He prefers pragmatic, well-documented refactors and testing-first improvements that reduce operational risk, and often surfaces non-obvious improvements like structured JSON logging and clearer test failure diagnostics. Jonathan reads widely on management and system design, pairing books like Turn the Ship Around! with Designing Data-Intensive Applications to inform both team culture and architecture.
23 years of coding experience
23 years of employment as a software developer
Bachelor of Science, Mathematics, Computer Science, Bachelor of Science, Mathematics, Computer Science at University of Tasmania
Stackoverflow
1,045reputation
51kreached
2answers
9questions
Github Skills (58)
asynchronous10
unit-testing10
timeseries-database10
json10
kubernetes10
docker10
dashboard10
pytest10
python10
back-end-development10
apidoc10
async10
testing10
microservices-application10
grafana10
Programming languages (18)
Github contributions (5)
weaveworks/grafanalib
Dec 2016 - Jul 2018
Python library for building Grafana dashboards
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:71 commits, 95 PRs, 115 pushes in 1 year 7 months
Contributions summary:Jonathan primarily contributed to the development and maintenance of a Python library for building Grafana dashboards. Their work involved refactoring code for style consistency and implementing new features like the `auto_panel_ids` method for generating panel IDs. They also focused on improving the user experience by adding new features, and extending the functionality of existing features.
python-librarypythongrafana-dashboardsdashboardsedsl
twisted/twisted
Nov 2002 - Dec 2015
Event-driven networking engine written in Python.
Role in this project:Backend & Test Automation Engineer
Backend & Test Automation EngineerContributions:606 commits, 1 PR, 4 pushes in 13 years 3 months
Contributions summary:Jonathan focused on enhancing the testing framework and resolving bugs related to the core components of the Twisted networking engine. They implemented test frameworks for asynchronous tasks, and also added support for running the tests via subprocesses, and introduced unit testing tools for various core classes. The user worked on patching up known bugs and refactoring various classes in the codebase.
pythonxmppevent-drivenasyncimap
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