Jani Hirsimäki
Senior R&D Engineer at Nordic Semiconductor ASA
Tampere, Mainland Finland
Summary
🤩
Rockstar🎓
Top SchoolJani Hirsimäki is a Senior R&D Engineer with over 20 years of hands-on experience designing, architecting and delivering complex telecom, embedded and cloud-native software across Nokia, Microsoft, Qvantel and Nordic Semiconductor. He blends deep protocol and modem expertise—TCP/IP, PPP, cellular stacks and modem shells—with modern microservices, Scala and React development, and has contributed to the widely used nRF Connect SDK for cellular IoT. Known as an initiative-taking, trustworthy leader and practical Scrum practitioner, he has held roles from developer and architect to manager, Scrum Master and Product Owner while also coaching teams. Jani maps business requirements into robust technical solutions, drives estimations and delivery, and has a track record of shipping hard product fixes and performance optimizations that enabled market launches. He holds patents in TCP/3GPP/WiMAX areas, reflecting a long history of protocol innovation that complements his current IoT and embedded work. Based in Tampere, Finland, he pairs systems-level thinking with hands-on coding and rapid learning across both legacy RTOS environments and modern CI/devops toolchains.
7 years of coding experience
15 years of employment as a software developer
Bachelor’s Degree, Machine Tool Technology & Production Technique, Bachelor’s Degree, Machine Tool Technology & Production Technique at Tampereen AmmattikorkeakouluMaster’s Degree, Telecommunications, SW & DSP, Master’s Degree, Telecommunications, SW & DSP at Tampere University of Technology
English, Swedish, Finnish
Github Skills (13)
nrf9110
iot10
embedded10
zephyr-rtos10
c-programming10
at-command10
sys10
network-protocol10
wifi9
json9
rest-api8
mqtt8
mqttnet8
Programming languages (1)
Github contributions (5)
nrfconnect/sdk-nrf
Mar 2021 - Jan 2023
nRF Connect SDK main repository
Role in this project:
Embedded Systems Engineer / IoT Developer
Embedded Systems Engineer / IoT DeveloperContributions:866 reviews, 132 commits, 86 PRs in 1 year 10 months
Contributions summary:Jani primarily contributes to the nRF Connect SDK for the nRF9160, a cellular IoT platform. Their work involves modifying and implementing features related to PPP (Point-to-Point Protocol) connections, including IPv6 support, enhancements for improved throughput, and integration with Zephyr's asynchronous PPP driver. The user also made changes to the location services, specifically focusing on Wi-Fi positioning and nRF Cloud integration, by adding new features. The user also worked on adding or improving features to the modem shell, including the addition of new commands for testing and configuring the device.
connect-sdknrf-connect-sdkinfinibandlteppp
jhirsi/sdk-zephyr
Mar 2021 - Mar 2025
NCS downstream of https://github.com/zephyrproject-rtos/zephyr
Contributions:73 pushes, 30 branches, 4 comments in 4 years 1 month
ncsrtoszephyr-rtoscsharpdownstream
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