I am a Software Engineer at  Google, Networking Infrastructure.
I am generally interested in data center networking, and improving the performance and reliability of large-scale systems. 
I received Ph.D. in Computer Science at KAIST in 2012 under Sue Moon and KyoungSoo Park.
Below is my employment history.
  -  Rubrik , Software Engineer, Dec. 2020 - May. 2023 
 
  -  Max Planck Institute for Software Systems , Tenure Track Faculty, Mar. 2019 - Dec. 2020
 
  - Google Networking Infrastructure, Software Engineer, Jan. 2016 - Feb. 2019 
 
  - Intel Labs, Research Scientist, Nov. 2014 - Jan. 2016
 	
  - Microsoft Research Cambridge, UK., Post Doctoral Researcher, Mar. 2012 - Mar. 2014
 
    
    
Peer-reviewed Conference
    
    
	
	- Swift: Delay is Simple and Effective for Congestion Control in the Datacenter, 
 
	
		- 
			Guatam Kumar, 
			Nandita Dukkipati,
			Keon Jang, 
			Hassan MG Wassel,
			Xian Wu,
			Behnam Montazeri,
			Yaogong Wang,
			Kevin Springborn,
			Christopher Alfeld,
			Michael Ryan,
			David Wetherall,
			Amin Vahdat,
		
 
		- SIGCOMM, Aug. 2020 [PDF]
 
		
	
	
		
	- Credit-Scheduled Delay-Bounded Congestion Control for Datacenters 
 
	
	
		
    - NetBricks: Taking the V out of NFV 
 
    
    
	
    - E2: A Framework for NFV Applications 
 
    
	- Silo: Predictable Message Latencyin the Cloud 
 
    
	
	- Accurate Latency-based Congestion Feedback for Datacenters 
 
    
	- NBA (Net-work Balancing Act): A High-performance Packet Processing Framework for Heterogeneous Processors  Best Student Paper 
 
    
	- Chatty Tenants and the Cloud Network Sharing Problem 
 
    
	- SSLShader: Cheap SSL Acceleration with Commodity Processors 
 
    
	- PacketShader: A GPU-Accelerated Software Router 
 
    
	
	- Path Stitching: Internet-wide Path and Delay Estimation from Existing Measurements 
 
    
	
	- Evaluation of VoIP Quality over WiBro 
 
    
	
    
     
 
    
    
Journals
    
    
	
		- DX: Latency-Based Congestion Control for Datacenters
		
        
		
		 - Scalable and systematic Internet-wide path and delay estimation from existing measurements
		
        
	 
	 
 
    
    
Workshops
    
    
	
		- The Power of Batching in the Click Modular Router
		
		
		
 - Building a 100 Gbps Software Router with Commodity Hardware
		
        
		 - Implementation and Evaluation of a Mobile PlanetLab Node
		
        
		 - Best-case WiBro Performance for a Single Flow
		
		
		
 - 3G and 3.5G Wireless Network Performance Measured from Moving Cars and High-Speed Trains
		
        
		
		 - Improving Delay Estimation with Path-Stitching
		
        
		
		 - Design Considerations for a Mobile Testbed
		
        
	 
	 
 
    
    
Poster & Demo
    
    
	
		- Towards an Open Middlebox Platform for Modular Function Composition
 
		
        
		- Reviving Delay-based TCP for DataCenters
		
        
		
		 - Modularity Meets Batching: Towars an Experimental Platform for High-speed Software Routers
		
		
		
 - Accelerating SSL with GPUs Best Poster
		
	
		
 - PacketShader: Massively Parallel Packet Processing with GPUs to Accelerate Software Routers
		
        
		 - Internet Sibilla: Utilizing DNS for Delay Estimation Service
		
        
	 
	 
 
    
    
Technical Reports
    
    
	
		- ExpressPass: End-to-End Credit-based Congestion Control for Datacenters
		
        
		
		 - SoftNIC: A software NIC to augment hardware
		
			- 
				Sangjin Han,
				Keon Jang, 
				Aurojit Panda, 
				Shoumik Palkar,
				Dongsu Han, 
				Sylvia Ratnasamy 
			
 
		-  Dept. EECS, Univ. California, Berkeley, Technical Report, UCB/EECS-2015-155, May. 2015 [PDF]
 
		
        
		
		 - Silo: Predictable Message Completion Time in the Cloud
		
        
		
		 - Path stitching: Scalable and systematic internet-wide path and delay estimation from existing measurements
		
        
	 
	 
 
Talks
	- "SoftNIC: A Software NIC to Augment Hardware"
 
	
		- Invited talk @ FUTURE INTERNET FORUM, Oct. 2014 
 
		- Invited talk @ Seoul National University, Oct. 2014
 
	
	- "Silo: Predictable Message Latency in the Cloud," SIGCOMM, Aug 2015 
 
	
        - Invited talk @ Sungkyunkwan University, May. 2014 
 
		- Invited talk @ UNIST, Oct. 2015
 
    
	- "Chatty Tenants and the Cloud Network Sharing Problem," NSDI, Apr 2013 
 
    - "SSLShader: Cheap SSL Acceleration with Commodity Processors," NSDI, Apr 2011 
 
 
 
Services
    - Program Committee
    
	    - NSDI 2021
     
	    - SIGCOMM 2019
 
	    - APNet 2017, 2019, 2020
 
	    - HotMiddlebox 2016
 
    
     - Reviewer
    
        - IEEE Transactions on Networking
 
		- ACM SIGCOMM Computer Communication Review
 
    
     
    - External Reviewer
    
        - INFOCOM 2017
 
        - SIGCOMM 2015