We're looking to strengthen our software development team!

Stack

Responsibilities

• ▹Own the architecture, development and maintenance of the OpenWRT-based router firmware
• ▹Develop and maintain system services in C (eventually also Rust) — network daemons, VPN integration (IPsec, WireGuard, OpenVPN), mobile network management (LTE/5G)
• ▹Work directly on the hardware: kernel configuration, driver integration, debugging via serial console and log analysis
• ▹Improve build processes, CI/CD pipelines and release workflows
• ▹Develop concepts for new features together with hardware development and product management
• ▹Make technical decisions and set quality standards for the software stack

Requirements

• ▹Several years of experience in Linux systems programming in C
• ▹Confident with OpenWRT, Buildroot or Yocto — you know how a Linux image is built
• ▹Solid understanding of network stacks: TCP/IP, routing, NAT, iptables/nftables
• ▹Experience with cross-compilation, Makefiles, shell scripting
• ▹Daily use of Git
• ▹Fluent German (working language)

Nice to have

• ▹Experience with Rust in systems programming
• ▹Knowledge of VPN protocols and their implementation
• ▹Experience with mobile modems (AT commands, QMI)
• ▹Hands-on hardware debugging
• ▹Python for tooling, test automation or scripting
• ▹Degree in computer science (or equivalent professional experience)

Soft skills

What we offer

• ▹Full ownership of the entire software stack — from idea to firmware running on the device
• ▹Real hardware on your desk — no developing against simulators
• ▹Short decision paths — small team, direct line to management and hardware development
• ▹Permanent contract with a salary in the €60,000–70,000 range
• ▹Flexible working hours
• ▹Good transport connections, free parking

About the company

comtime is a small, owner-led German company that develops industrial routers 'Made in Germany' — from hardware to firmware — connecting machines, plants and infrastructure via mobile networks and VPN.