Job Description

Develop Linux user-space firmware for Ubiquiti networking products;

Collaborate with global firmware, hardware, cloud, and product teams throughout the product lifecycle;
Design, implement, and maintain system services, management daemons, libraries, and product business logic;
Develop network-facing applications using sockets, IPC mechanisms, netlink, and event-driven I/O;
Integrate open-source packages and third-party components into our OpenWrt-based firmware and build systems;
Maintain and improve existing firmware, focusing on stability, performance, security, and resource efficiency;
Develop interfaces between low-level platform components, device-management services, and higher-level product features;
Diagnose complex laboratory and field issues using logs, packet captures, tracing, core dumps, and profiling tools.

Requirements

3+ years of embedded Linux software development experience using C or C++
Strong understanding of Linux internals, including processes, threads, memory management, filesystems, signals, and service lifecycle
Experience with Linux networking, sockets, IPC, netlink, epoll, and asynchronous application design
Solid networking fundamentals, including Ethernet, TCP/UDP, IPv4/IPv6, routing, bridging, firewalls, and DNS/DHCP.
Experience with Git, Bash, cross-compilation, toolchains, and embedded build systems such as OpenWrt or Buildroot.
Experience with AI tools - Claude, Codex, etc.
Fluent in English and Lithuanian.

Nice to have

Hands-on experience with OpenWrt components such as procd, ubus, UCI, rpcd, or netifd
Experience designing APIs, configuration systems, state machines, or management services for embedded products
Knowledge of Linux security, process isolation, secure update mechanisms, and application hardening
Experience with system performance analysis, memory-leak detection, crash analysis, and resource optimization
Familiarity with BSPs, bootloaders, Linux device drivers, or hardware bring-up
Python or Bash scripting experience and familiarity with automated testing and CI/CD systems
Experience maintaining or contributing to open-source software.

International work environment and work with global development teams
Ability to deliver software that is used by millions of people across the globe
Opportunity to leverage and integrate modern AI tools into product development
Access to all Ubiquiti products
Medical insurance
Hybrid approach - office in Kaunas
Flexible work hours
A-class office with all the necessities - snacks, drinks, free lunches, free parking, etc!