Johanna Appel
Senior Consultant & Co-Founder at Freelance
Lisbon, Portugal
Summary
👤
Senior🎓
Top SchoolJohanna Appel is a senior consultant and serial tech co-founder with 14 years of experience helping leadership teams turn AI from hype into practical, production-ready software. Based in Lisbon, she combines hands-on backend engineering (notably contributions to the Phoenix framework around websockets, testing and docs) with product and design-thinking expertise to architect scalable data and AI-driven systems. She has repeatedly launched and scaled startups and interim leadership roles—bridging strategy, engineering and customer-centric product discovery. Comfortable across Elixir/Erlang, Scala and cloud/serverless stacks, she focuses on pragmatic solutions that balance algorithmic innovation with real-world operability. An understated strength is her ability to translate complex technical trade-offs into executive decisions, earned through both consulting and founding experiences.
14 years of coding experience
11 years of employment as a software developer
Design Thinking (Basic & Advanced Track), Design Thinking (Basic & Advanced Track) at Hasso Plattner InstituteBachelor of Science (B.Sc.) Mathematics, Bachelor of Science (B.Sc.) Mathematics at Humboldt-Universität zu Berlin
German, English, French, Spanish, Norwegian, Portuguese
Stackoverflow
11reputation
355reached
0answers
1question
Github Skills (17)
elixir10
phoenix-liveview10
phoenix-framework10
apache-phoenix10
websocket9
configuration-management9
api8
apim8
testing8
api-design8
test-automation7
documentation7
distributed-systems6
python6
dataframe6
Programming languages (8)
Github contributions (5)
phoenixframework/phoenix
Jan 2015 - Jul 2016
Peace of mind from prototype to production
Role in this project:
Back-end Developer
Back-end DeveloperContributions:13 commits, 9 PRs, 18 comments in 1 year 6 months
Contributions summary:Johanna primarily contributed to the Phoenix framework, focusing on configuration, testing, and documentation improvements. Their commits introduced features for configurable websocket timeouts and handling channel information. The user also addressed several bugs, including fixing incorrect module base names and improving socket documentation. Their work demonstrates a good understanding of the framework's internal workings.
realtimepeacephoenix-frameworkelixirprototype
entice/entity
Dec 2014 - Apr 2016
Contributions:98 commits, 4 PRs, 62 pushes in 1 year 4 months
javacsharpbehavioursserves
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