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Subhash Choudhary

@subhashchoudhary

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Senior Software Engineer at IBM ISDL improving OpenAFS performance and reliability across Linux and macOS.

India

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At IBM, I work on AFS, a scale-out distributed file system, contributing to performance, scalability, and reliability across Linux and macOS. I’ve designed, debugged, and optimized storage Data I/O and Data Path components, including Linux kernel modules and VFS integration.

My OpenAFS work includes kernel compatibility enhancements, cache management, authentication, and Control Path operations. I use GDB, crash dump analysis, SystemTap, and eBPF to investigate complex filesystem and kernel issues.

At Dell, I contributed to NetWorker backup and recovery components, including CloudBoost, cloning, and recovery workflows. I owned a critical block-based backup module end-to-end and worked on multithreaded C components for backup, restore, and storage management.

Earlier, I developed Linux endpoint DLP features at Digital Guardian, including kernel modules and system-call hooking. Across my work, I’ve also contributed to Linux device drivers, embedded communication protocols, Kubernetes deployments, and Python automation.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer

Current

IBM

Jun 2023 - Present (3 years 3 months)

Working with AFS (Andrew File System), a scale-out distributed file system, responsible for enhancing performance, scalability, and reliability across Linux and macOS platforms. Involved in Unix/Linux systems programming in C, contributing to file system and storage software development, including client-server RPC flows, cache consistency, callbacks, and failure handling.

C Unix Linux Distributed File Systems OpenAFS GDB Systemtap eBPF Python Kernel Programming Storage Data Path Control Path Performance Optimization

Senior Engineer

GE Healthcare

May 2021 - Jun 2023 (2 years 1 month)

Development and maintenance of the Monitoring Solutions product line. Worked on transforming GE Healthcare hardware-only solutions into platform-based software solutions using virtualization and containerized deployments on Kubernetes.

Kubernetes Virtualization Containerization Nessus Qualys Cybersecurity POC Architecture

Senior Software Engineer

Dell

Jun 2019 - May 2021 (1 year 11 months)

Contributed to the development and sustenance of Dell EMC NetWorker, an enterprise-grade backup and restore storage product. Worked as an individual contributor on block-based backup components, including CloudBoost, cloning, and recovery workflows, implemented using multithreaded systems programming in C.

C Multithreading Windows Linux GDB crash dump analysis Cloud Boost Networker Storage Backup Restores Data Path Control Path

Senior Developer

Stratus Technologies

Jul 2018 - Jun 2019 (11 months)

Development of layered product on Vos platform, bug fixing, kernel development, open-source support and maintenance, and sanity releases.

Kernel Development Open Source Bug fixing VOS

Senior Engineer

Digital Guardian

Feb 2017 - Jul 2018 (1 year 5 months)

System Security and Data protection, kernel and system call hooking. Event monitoring, pacifying user action by rule and policies. Data loss prevention from all kind of data transfer to and from the system.

C Linux Linux kernel modules System Calls DLP Endpoint Security Debugging GDB

Project Associate

Cognizant Technologies Solutions

Apr 2015 - Feb 2017 (1 year 10 months)

Worked on character driver for serial driver. Working experience on Internet of Things, home energy management, security devices and cryptographic. Hands-on experience in C, C++.

C C++Linux CAN I2C SPI UART Embedded Systems Device Drivers Kernels

Associate Engineer

Tech Mahindra Limited

Oct 2011 - Apr 2015 (3 years 6 months)

Linux porting, Linux device drivers, peripheral interface application development (UART, SPI, I2C and others), application development in C. Protocol implementation on Embedded Linux like UART, SPI, CAN, I2C and others.