Juhana Jauhiainen
Technical Lead at Codemen Oy
Finland
Summary
👤
Senior🎓
Top SchoolJuhana Jauhiainen is a Technical Lead and seasoned full-stack engineer with 13 years of experience building web and desktop applications across Python/Django, TypeScript/React, Node.js and Azure. He has led development of a custom ERP, large-media transfer tooling, and Electron-based healthcare apps—projects that span backend, frontend, CI/CD and cloud deployments. Comfortable shipping end-to-end solutions, he also architects data flows and has hands-on experience optimizing transfers of 100GB+ media sets and integrating Redis for performance. An active open-source contributor, he improved test quality for notable projects like react-i18next and HospitalRun by migrating suites to React Testing Library and strengthening hook tests. Based in Finland, he combines rapid onboarding of unfamiliar codebases with a pragmatic product focus, often translating complex client needs into maintainable systems. Colleague feedback typically highlights his blend of technical depth, usability attention from his media-tech background, and steady team leadership.
13 years of coding experience
14 years of employment as a software developer
Bachelor of Engineering in Media Technology, Software Development, Usability, Computer Graphics, Graphic Design, Bachelor of Engineering in Media Technology, Software Development, Usability, Computer Graphics, Graphic Design at Centria University of Applied Sciences
Github Skills (16)
i18n-js10
testing-library10
react-testing-library10
javascript10
ember-i18n10
rails-i18n10
jestjs10
react10
testing10
web-frontend9
translation9
front9
frontend9
react-native5
react-native-component5
Programming languages (11)
Github contributions (5)
HospitalRun/hospitalrun-frontend
Dec 2020 - Jan 2021
Frontend for HospitalRun
Role in this project:
Front-end Developer
Front-end DeveloperContributions:29 commits in 28 days
Contributions summary:Juhana focused on migrating existing test files within the `hospitalrun-frontend` repository to use the React Testing Library (RTL). They converted multiple test files (`Imagings.test.tsx`, `VisitTable.test.tsx`, `VisitTab.test.tsx`, `ViewVisit.test.tsx`, `VisitForm.test.tsx`, `SearchPatients.test.tsx`, `NotesList.test.tsx`, `NotesTab.test.tsx`) to RTL. The changes involve updating test assertions, user interaction, and DOM element selection methods to align with RTL's principles.
reactemrhospitalrunhospitalrun-frontendjavascript
i18next/react-i18next
Dec 2020 - Dec 2020
Internationalization for react done right. Using the i18next i18n ecosystem.
Role in this project:Front-end Developer
Front-end DeveloperContributions:2 reviews, 6 commits, 5 comments in 3 days
Contributions summary:Juhana primarily contributed to improving the testing infrastructure and test coverage for the `react-i18next` library. Their work involved migrating existing tests to use RTL (React Testing Library) for better testing practices, updating snapshots for UI consistency, and refactoring test code to utilize `renderHook` for testing React hooks. These changes specifically focused on improving the reliability and maintainability of the useTranslation hook.
reactreact-nativetranslationi18nextjavascript
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