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

Positive 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

📌 Software Engineer III (Pune)
🏢 DataDirect Networks
📍 Pune