Onni Hakala
Engineering Manager
Tallinn, Harju County, Estonia
Summary
👤
Senior🎓
Top SchoolOnni Hakala is an engineering manager and product-minded software engineer with 12 years of experience building secure, cost-efficient cloud services for e-commerce, payments and accounting. He has led remote cross-functional teams of up to eight engineers, owned roadmaps and OKRs, and delivered features that directly impacted checkout conversion and on-time fulfilment while producing tens of millions in client savings. Hands-on across AWS, GCP and Cloudflare, he has architected systems handling hundreds of millions in annual revenue and worked on high-security payment accounting systems at scale. He combines pragmatic engineering—avoiding overengineering—with a focus on measurable customer impact, from BNPL integrations to chaotic serial-number‑based shelving to improve fulfillment. An active open-source contributor, his PHP composer plugin has nearly two million downloads and he’s fixed robustness issues in popular projects like Ruby on Jets. Based in Tallinn, he’s available for contract work and known for mentoring mid-level engineers into senior and management roles.
12 years of coding experience
11 years of employment as a software developer
Unfinished degree, Computer Software Engineering, Unfinished degree, Computer Software Engineering at Tampere University of Technology
English, Finnish, Estonian, Swedish
Stackoverflow
570reputation
37kreached
7answers
11questions
Github Skills (17)
aws-lambda10
rails10
ruby10
aws10
ruby-on-rails10
serverless9
git8
syntaxerror6
cache-control6
nginx6
react6
php6
bash6
continuous-integration6
travis-ci6
Programming languages (24)
Github contributions (5)
rubyonjets/jets
Nov 2018 - Nov 2018
Ruby on Jets
Role in this project:
Back-end Developer
Back-end DeveloperContributions:6 commits, 3 PRs, 7 comments in 1 day
Contributions summary:Onni primarily focused on improving the robustness and usability of the `jets` Ruby on Rails framework, particularly in handling AWS credentials and the interaction with the AWS CLI. Their commits addressed issues related to missing credentials and ensured the framework could function correctly even when AWS configuration wasn't readily available. They also fixed issues related to the framework's interaction with git during initialization. The user's contributions demonstrate a focus on improving the framework's error handling and user experience.
serverlessrubyonjetsrubyawslambdaruby-on-jets
onnimonni/homebrew-cask
Jan 2023 - Feb 2025
🍻 A CLI workflow for the administration of macOS applications distributed as binaries
Contributions:1 PR, 9 pushes, 2 branches in 2 years
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