Viljami Narinen
Front-End Developer at Valo
Helsinki, Finland
Summary
👤
Senior🎓
Top SchoolViljami Narinen is a front-end developer and Information Networks master's student at Aalto University with nine years of software experience spanning startups, corporate finance, and hardware testing. He combines human-centric UX focus, accessibility and validation expertise with hands-on front-end stacks like React/Next.js and practical product development from prototyping to deployment. At Valo.ai he builds AI-driven admin tools for Salesforce, and previously contributed to OP's invoicing and KYC front ends while also designing test processes and tooling for haptic hardware at Aito. He’s an active open-source contributor with back-end work on the well-known OpenTripPlanner project, implementing HSL fare logic and extending ticket queries—an uncommon mix of transit backend insight alongside strong front-end craft. Based in Helsinki, he bridges people, technology and business to turn complex requirements into usable, testable products.
8 years of coding experience
3 years of employment as a software developer
Matriculation Examination Upper Secondary School, Matriculation Examination Upper Secondary School at Helsingin ranskalais-suomalainen koulu, Lycée franco-finlandais d'HelsinkiMaster of Science (Technology) Information Networks, Master of Science (Technology) Information Networks at Aalto University
Finnish, English, French, Swedish
Github Skills (10)
opentripplanner10
javas10
junit10
java10
jtest10
wpgraphql9
apidoc9
wordpress-graphql9
api9
graphql9
Programming languages (3)
Github contributions (5)
opentripplanner/OpenTripPlanner
Aug 2022 - Jan 2023
An open source multi-modal trip planner
Role in this project:
Back-end Developer
Back-end DeveloperContributions:40 reviews, 51 commits, 8 PRs in 5 months
Contributions summary:Viljami focused on implementing fare-related logic, specifically for the HSL (Helsinki Regional Transport Authority) public transit system. Their work included adding new classes and modifying existing ones to handle HSL-specific fare rules, including those for agency-specific routes and interlining. They also added tests for the HSL fare service and extended the legacy GraphQL API to support ticket type queries.
multi-sourcemulti-modaltrip-plannermodalplanner
nurmAV/onebusaway-gtfs-modules
Oct 2022 - Apr 2023
A Java-based library for reading, writing, and transforming public transit data in the GTFS format, including database support.
Contributions:4 pushes, 2 branches in 6 months
transit-datagtfspublic-transitgtfs-formatdatabase
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