# Software Engineer III at DDN

Software Engineer III at DDN in Pune Office. On-site, full-time. Posted October 15, 2026.

- Company: DDN
- Location: Pune Office
- Workplace: On-site
- Job type: Full-time
- Experience: 8+ years
- Posted: 2026-10-15
- Apply: https://jobs.ashbyhq.com/ddn/ddc59eeb-cb37-400f-a18b-461cedafe558/application
- Source: https://jobmagic.ai/jobs/software-engineer-iii-ddn-21k9cv

## Description

**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