Senior Linux Systems Engineer

Ubuntu Core Platform EngineerWe run an established Ubuntu Core-based platform and display-server estate deployed across a large fleet of devices, along with the applications that run on it. We're looking for an experienced OS internals engineer to own the platform: keep it secure, stable, and performant, evolve it where it makes sense, and make sure changes reach every unit reliably.You'll inherit systems that work and have room to improve them, but we value incremental, well-reasoned change over rewrites. You'll lead our infrastructure function and provide technical direction for the team.What You'll DoPlatform and fleetOwn the Linux platform end to end: kernel and base snap versions, patching cadence, image management, end-of-life planningRun deployment and update pipelines that push OS, driver, application, and configuration changes safely across a large number of units: channels and tracks, staged rollouts, canaries, health checks, rollbackMaintain the display-server layer (Ubuntu Frame/Mir, Wayland, X11, GPU drivers, remote display) on embedded and server-class hardwareApplication stability and performanceEnsure the applications running on the platform are stable under real-world load: resource limits, service supervision via snapd and systemd, restart behavior, dependency managementProfile and tune at the OS/application boundary: CPU scheduling, memory pressure, I/O, GPU utilization, network throughputDefine health and performance baselines, set up alerting on regressions, and lead root-cause analysis when things degradeSecurityOwn the OS security posture: hardening baselines, access control, privilege separation, secure boot, disk encryptionUse snap confinement (AppArmor, seccomp, interfaces) as the primary isolation boundary for applicationsRun vulnerability management: CVE monitoring and triage, patch prioritization, and coordinated rollout across the fleetReduce attack surface at the application layer: least privilege, dependency and supply-chain hygieneMaintain audit logging and integrity checks; support incident response and any compliance requirementsLeadershipIdentify where the platform should evolve and make the case with clear tradeoffs and migration pathsKeep documentation, runbooks, and fleet tooling accurate and usable by othersManage and mentor engineers on the team; set priorities across OS, fleet, application, and cloud reliability workBe the escalation point for anything below the application code itselfWhat We're Looking For8+ years running production Linux systems, with real depth in kernel, boot, init, storage, and networking internalsExperience deploying and updating Linux at fleet scale, ideally on Ubuntu Core: snap packaging and confinement, channel and track management, transactional updates and rollback, and a fleet management tool (Landscape or similar)Track record of keeping production applications stable and fast on Linux, including profiling and performance debuggingStrong security background: you read advisories, understand attack surface, and patch without breaking thingsHands-on experience with display servers and GPU stacks beyond the desktop use caseJudgment about when to change something and when to leave it aloneComfortable with scripting (Bash, Python) and observability tooling (Prometheus, Grafana, or similar)Prior experience leading or mentoring engineersClear written communicationNice to HaveExperience with IoT or edge device fleets: constrained hardware, intermittent connectivity, remote provisioning and recoveryExperience building and publishing snap packages, including confinement design and interface declarationsExperience building custom Ubuntu Core images, gadget and kernel snaps, or brand storesFamiliarity with other immutable OS models (ostree, NixOS)Kernel module or driver debugging experienceEnough cloud familiarity (AWS, GCP, or similar) to partner well with cloud-focused engineersCompliance exposure (SOC 2, ISO 27001, CIS benchmarks)COMPANY OVERVIEWOrange Barrel Media (OBM) creates and operates iconic urban media displays that advertisers ask for by name in top U.S. markets. Since our founding in 2004, OBM has pioneered a community-oriented model of outdoor media development and is nationally recognized by cities and real estate owners alike seeking to implement premier media programs that add to the character of urban places. In the advertising community, OBM is widely recognized as the owner of the highest impact and most memorable advertising locations in the cities where it operates.The OBM team is also a leader in smart city infrastructure, launching the Interactive Kiosk Experience (IKE) platform in concert with cities across the U.S. through the company IKE Smart City. IKE is a best-in-class public engagement platform that helps cities communicate with the public, enliven the pedestrian experience, and tell the story of their city. The core pillars of the IKE platform are public benefit and social equity, values that we seek to maximize in every IKE market to achieve city objectives and exceed community expectations.We are a place where people are inspired to achieve success, genuinely like each other, and have endless opportunities to grow.