Posting record
Open 12+ days
- Ddn's site dates the posting
- Ghostless first sees this listing
- Last checked: still up
How we know
It hasn't been reposted, listed twice, or left up unusually long, and the posting doesn't say it's a talent pool.
Ghostless records the day it first sees a posting, so a repost can't reset its age. This one was already up when Ghostless started tracking Ddn, so its true age is longer.
Last checked Nov 2, 2026.
How well do you match?
See how much of this posting your resume shows, and what it's missing.
Upload your resumeWhat it asks of you
- 8+ years of experience
What the posting discloses
Not stated: Pay, real vacancy, AI screening.
Why these three
Ontario requires postings from employers with 25 or more staff to state the pay, whether the vacancy exists, and whether AI screens applicants.
Some employers add pay only on their own site. Check the original posting before you rule it out.
Skills mentioned
About the role
Job Summary
We are looking for a skilled Software Engineer III to design, develop, and optimize userspace block devices on Linux. The role involves working close to the Linux kernel, io_uring, and storage subsystems to build high‑performance, reliable, and scalable storage solutions.
Roles and Responsibilities
- Design, develop, and maintain UBLK-based userspace block devices on Linux
- Work with Linux block layer, io_uring, and kernel interfaces
- Implement high‑performance I/O paths with low latency and high throughput
- Debug and resolve issues across user space and kernel space
- Optimize storage performance, memory usage, and CPU utilization
- Collaborate with kernel, platform, and application teams on storage architecture
- Write clean, maintainable, and well-documented code
- Review code and contribute to design discussions and technical decisions
- Participate in performance benchmarking and regression analysis
- Guide and assist QA group with creating & executing the test cases.
- Provide insight into the system behaviour by analysing system logs & debugging software
Skills
· Software development with strong C programming.
Candidate should have 8+years of experience.
· Solid experience with Linux internals
- Good understanding of:
- Linux block device subsystem
- io_uring
- System calls, memory management, and concurrency
- Experience with userspace–kernel interaction (netlink, ioctl, sysfs, etc.)
- Strong debugging skills using tools like:
- gdb, perf, strace, ftrace, bpf
- Experience working in multithreaded and high‑performance environments
- Familiarity with POSIX APIs and low‑level I/O mechanisms
- Good understanding of data structures and algorithms
- Hands-on experience with UBLK , SPDK or other storage frameworks
· Development experience in high availability clustering solutions required.
- Prior experience contributing to Linux kernel or storage-related open source
- Knowledge of file systems (ext4, xfs, btrfs, etc.)
- Experience with virtualization or container storage (KVM, Docker, Kubernetes CSI)
- Working experience with RDMA , NVMe, NVMe-oF preferred
- Experience in performance tuning on production systems
- Scripting experience (Python, Bash) preferred
- Strong problem-solving and analytical skills
- Ability to work independently on complex system-level problems
- Good communication skills for cross-team collaboration
- Passion for low-level systems and performance engineering
Something wrong with this posting?