Software Engineer III

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

See the posting on DDN's site