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
Skills Required
- 8+ years of software development experience
- Strong C programming experience
- Solid experience with Linux internals
- Understanding of Linux block device subsystem and io_uring
- Knowledge of system calls, memory management, and concurrency
- Experience with userspace-kernel interaction, including netlink, ioctl, or sysfs
- Strong debugging skills with tools such as gdb, perf, strace, ftrace, or BPF
- Experience in multithreaded and high-performance environments
- Familiarity with POSIX APIs and low-level I/O mechanisms
- Understanding of data structures and algorithms
- Hands-on experience with UBLK, SPDK, or other storage frameworks
- Development experience in high-availability clustering solutions
- Prior contribution to Linux kernel or storage-related open source
- Knowledge of file systems such as ext4, XFS, or Btrfs
- Experience with virtualization or container storage, including KVM, Docker, or Kubernetes CSI
- Working experience with RDMA, NVMe, or NVMe-oF
- Performance tuning experience on production systems
- Python or Bash scripting experience
- Strong problem-solving and analytical skills
- Ability to work independently on complex system-level problems
- Good communication skills for cross-team collaboration
What We Do
DDN is the world’s largest private data storage company and the leading provider of intelligent technology and infrastructure solutions for Enterprise At Scale, AI and analytics, HPC, government and academia customers. Through its DDN and Tintri divisions, the company delivers AI, Data Management software and hardware solutions, and unified analytics frameworks to solve complex business challenges for data-intensive, global organizations. DDN provides its enterprise customers with the most flexible, efficient and reliable data storage solutions for on-premises and multi-cloud environments at any scale. Over the last two decades, DDN has established itself as the data management provider of choice for over 11,000 enterprises, government, and public-sector customers, including many of the world’s leading financial services firms, life science organizations, manufacturing and energy companies, research facilities, and web and cloud service providers.
