Topi Miettinen
Database Engineer
South Karelia, Finland
Summary
🤩
Rockstar🎓
Top SchoolTopi Miettinen is a Database Engineer with 11 years of hands-on experience building and hardening system-level software and data platforms in Finland. He combines strong Linux systems expertise—evident from contributions to high-profile projects like systemd, SELinux, and firejail—with practical backend development work in open-source applications and games. At Lapin hyvinvointialue he focuses on database engineering while his past work spans Python-powered embedded solutions, web stacks, and production-grade security improvements. Colleagues rely on his knack for debugging subtle kernel/cgroup and SELinux issues, and for implementing pragmatic security controls such as seccomp and memory-deny-write-execute. He pairs rigorous low-level problem solving with an ability to deliver user-facing features, shown by fixes and enhancements across diverse codebases. Based in South Karelia, he brings a rare blend of systems security, sandboxing, and backend development experience to data and infrastructure challenges.
11 years of coding experience
1 year of employment as a software developer
Engineer's degree, Information Technology, Engineer's degree, Information Technology at Centria University of Applied Sciences
Github Skills (41)
sandbox10
filesystem10
c-language10
seccomp10
group-policy10
multiplayer10
realtime10
gameplay10
it-security10
open-source10
linux10
c1110
policies10
linux-namespaces10
file-operations10
Programming languages (11)
Github contributions (5)
netblue30/firejail
Jul 2017 - Dec 2021
Linux namespaces and seccomp-bpf sandbox
Role in this project:
Back-end Developer & System Security
Back-end Developer & System SecurityContributions:45 reviews, 57 commits, 105 PRs in 4 years 5 months
Contributions summary:Topi primarily contributed to the core functionality of firejail, focusing on system-level security features and sandboxing. They implemented and improved the handling of mount operations, addressing issues related to read-only, read-write, and noexec flags. Their work included blocking obsolete and unusual syscalls and enhancing the seccomp filters. They also integrated a new feature for memory-deny-write-execute to block attempts to create writable and executable memory.
bpfseccomplinuxnamespacessandbox
systemd/systemd
Nov 2022 - Feb 2023
The systemd System and Service Manager
Role in this project:Back-end Developer & System Administrator
Back-end Developer & System AdministratorContributions:256 reviews, 2 commits, 133 PRs in 3 months
Contributions summary:Topi's commits primarily involve modifications to the systemd codebase, focusing on improving its stability, security, and functionality. They addressed a kernel bug fix related to cgroups, ensuring correct thread termination. They made changes to the networkd and resolved daemons, including improvements for security and correct privilege dropping. Their work extended to filesystem configurations, including applying size limits to tmpfs mounts and fixing SELinux contexts, demonstrating a strong understanding of system-level programming and Linux system administration.
servicesservice-managervagrantlinuxinit
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