Oskari Lemmelä
Senior Software Developer at Elisa
Vantaa, Finland
Summary
👤
Senior🎓
Top SchoolOskari Lemmelä is a Senior Software Developer based in Vantaa, Finland with eight years of professional experience and a decade-long tenure at Elisa spanning system specialization to senior development. He brings deep expertise in virtualization (VMware, KVM, OpenStack), networking hardware and security (Cisco, Juniper, Palo Alto, Checkpoint), and low-level engineering across C/C++, embedded Linux, and device drivers. Oskari is an active open-source contributor to OpenWrt/ImmortalWrt, where he has added Allwinner and Mediatek platform support, SPI flash and watchdog functionality, and fixed timing and driver issues for real-world IoT devices. Comfortable across full stacks—from Oracle databases and server OSes to Node.js, Ruby, and Python—he excels at bridging firmware, networking, and cloud infrastructure. Colleagues rely on him for pragmatic problem solving that turns flaky hardware behavior into production-grade firmware and stable network services.
8 years of coding experience
7 years of employment as a software developer
M.Sc. in Technology, Networking Technology, M.Sc. in Technology, Networking Technology at Teknillinen korkeakoulu-Tekniska högskolan
Github Skills (31)
spi10
linux-kernel10
flash10
openwrt10
device-tree10
dts10
u-boot10
sys10
dt10
arm10
embedded10
routers9
patch9
mmc9
router9
Programming languages (7)
Github contributions (5)
openwrt/openwrt
Jul 2018 - Dec 2025
This repository is a mirror of https://git.openwrt.org/openwrt/openwrt.git It is for reference only and is not active for check-ins. We will continue to accept Pull Requests here. They will be merged via staging trees then into openwrt.git.
Role in this project:
Embedded Systems Engineer / IoT Developer
Embedded Systems Engineer / IoT DeveloperContributions:11 reviews, 10 PRs, 74 comments in 7 years 5 months
Contributions summary:Oskari primarily contributes to the OpenWrt project, focusing on device tree and driver modifications. Their work includes adding and modifying device tree files (DTS) for Allwinner SoCs, specifically related to SPI flash, watchdog timers, and serial NAND support for the Banana Pi BPI-R64. The user also fixed timer instability issues and adapted the mt7622 boot process, enhancing the overall hardware support for these embedded systems.
openwrt
immortalwrt/immortalwrt
Feb 2021 - Apr 2021
An opensource OpenWrt variant for mainland China users.
Role in this project:Embedded Systems Engineer / IoT Developer
Embedded Systems Engineer / IoT DeveloperContributions:9 commits in 1 month
Contributions summary:Oskari primarily contributed to the OpenWrt-based firmware, focusing on adding support for various hardware features and fixing existing issues. They added SPI flash node support and watchdog functionality for the Allwinner A64 SoC, along with fixing timer instability issues. The user also worked on Mediatek MT7622 platform, adding eMMC and SPI-NAND support for the BPI-R64 board and refining the image generation process. Additionally, the user improved the existing ath79 drivers by fixing spi driver delays.
openwrt
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