With over 15 years of experience in Virtualization technologies I am currently
working on the lower-level parts of the stack to attack issues related to
performance, scalability, power-efficiency and security in hypervisors. Since
2015 I have been affiliated with UK & EU firms, building & architecting
solutions for efficient execution of workloads in the Cloud and at the Edge. I
have been involved in many parts of the systems software stack, including
device drivers, memory management, network/block layers etc.
Previously, I was a Post-doc at CSLab, NTUA, working on bridging the gap between common HPC
practices and virtualization. My research interests include I/O Virtualization,
systems software for high-performance I/O in virtualized environments, systems
support for heterogeneous platforms, communication architectures for clusters,
and scalable storage architectures based on clusters.
I hold a Diploma in Engineering (2006) from ECE, NTUA and a PhD in Computer Engineering
(2013) from NTUA.
I have been involved in the academic research community for quite some time,
serving as TPC member or external referee for various CS-related conferences
and scientific journals. Since 2011, I co-organize the VHPC workshop series, held in conjunction with
Europar, SC, and ISC.
Up2Metric S.A. - Cloud consultant
Sep 2020 – Aug 2021
Container and Cloud consulting solutions for ML acceleration and orchestration.
Mellanox Technologies LTD - Software / Systems Engineer
May 2020 – Jul 2020
Design and develop a TMfifo virtual device to passthrough a physical QRNG
device to a Bluefield PCIe SmartNIC.
Nubificus LTD - Director & Systems Architect
Apr 2020 – present
Nubificus Ltd is a software consultancy tackling complex virtualization
problems. We explore lightweight virtualization solutions for edge, low power
devices, aiming to bring Serverless and FaaS at the Edge.
- we enable hardware acceleration for Serverless Computing (https://vaccel.org)
- we experiment with the systems software stack to reduce OS system overhead by enabling in-Kernel task isolation using virtualization
techniques (in-kernel VMM)
- we explore container runtimes to facilitate efficient workload placement in the Cloud and at the Edge, focusing on interoperability.
Sunlight.io LTD - Researcher / Systems Engineer
Jul 2018 – Apr 2020
Architecting, implementing, and optimizing a state-of-the-art hyperconverged hypervisor stack that achieves extreme storage and network performance.
OnApp LTD - Researcher / Systems Engineer
Feb 2015 – Jun 2018
Conducting research in emerging, power-efficient micro-server architectures
on scalable network and storage I/O, and energy-driven resource management in
Cloud architectures. This work consists of designing and implementing
low-level hypervisor and OS mechanisms to provide applications efficient,
isolated, and secure access to hardware resources.
CSLab, ECE, NTUA - Postdoctoral Research Fellow
May 2014 – Jan 2015
Worked on I/O Virtualization, systems software for high-performance I/O in
virtualized environments, communication architectures for clusters, and
scalable storage architectures based on clusters.
NTUA - PhD in Computer Engineering
Efficient I/O Device Sharing in Virtualized Environments.
As HPC applications scale to a large number of VMs, providing near-native network I/O performance to each peer VM is an important challenge. In this work, we present Xen2MX, a paravirtual interconnection framework, based on the Open-MX protocol, a port of the Myrinet/MX over generic Ethernet adapters. Experimental evaluation of our prototype implementation shows that Xen2MX is able to achieve nearly the same aw performance as Open-MX running in a non-virtualized environment.
Mist.io Inc - Co-founder & Systems Engineer
Jul 2013 – Jan 2015
Design, develop, deploy and maintain the company’s product. Mist.io is about
cloud server management, monitoring and automation across multiple cloud
Maxeler Technologies LTD - Intern
Sep 2011 – Mar 2012
Worked on porting the company’s custom FPGA boards to virtualized
environments. As my task was completed quickly, I joined the hardware group
working on the company’s new product line (MPCX), doing performance
evaluation at first as well as kernel developing for the board’s interface
driver and the networking stack (Infiniband)
Unweb - Systems Engineer
Jan 2011 – Jul 2013
Served as a systems engineer, deploying, administering and maintaining the
company’s infrastructure both on bare-metal servers (co-located) as well as
cloud servers (mostly Amazon EC2).
CSLab, ECE, NTUA - Junior Researcher
Apr 2007 – Dec 2013
For the purpose of my PhD thesis, I worked on scalable block-level storage
systems, communication architectures for clusters, custom 10gigE
interconnection frameworks and I/O Virtualization.
ECE, NTUA - Dipl. Eng.
Design and impementation of a mechanism transfering data from storage devices
to Myrinet networks bypassing the memory hierarchy.
The objective of this
study is the design and implementation of a framework that transfers data
from local storage devices to Myrinet networks, bypassing the memory
hierarchy of the system. Data flow from the storage device to the network,
without touching the host’s memory subsystem.
CC, ECE, NTUA - Senior Unix/Linux Administrator
Oct 2005 – Sep 2011
Set up the entire lab (25-30 workstations, 5 servers), migrated from
Solaris/SunOS 4.3 to Debian GNU/Linux, and maintained the lab which featured
a fully autonomous setup, able to provide the necessary software for students
to work on ECE school’s projects.
PC Systems SA - Unix Engineer
May 2004 – Sep 2004
Served as backend support for the company’s clients, mostly Solaris and some