Nov 2014 – Mar 2015 · 4 mos · Gurgaon

• ☛ Principal Architect responsible for Packet-Optical, Transport SDN and Career Grade NFV portfolios and solutions based on distributed GMPLS and centralized SDN control plane architectures
• ☛ Key responsibilities include driving systems engineering, solutions architecture and technical marketing functions in relevant domains supporting tier-1 OEM vendors & service providers.
• ☛ Currently focusing on multi-layer packet-optical transport, software defined optics, transport SDN, packet transport and DCI/DCC solutions
• ☛Key platforms supported include Fujitsu’s FW 9500/CDS and ALU’s 1830 PSS/1850 TSS/ Nuage VSP

Mar 2011 – Oct 2014 · 3 yrs 7 mos · Gurgaon, India

• ☛Successfully led product line marketing, architecture definition, software development, and system engineering functions to support progressive evolution of CISCO’s converged career grade packet-optical transport platforms from concept to deployment incl. NCS4001, NCS4016, NCS2K, NCS6K
• ☛Executed multiple roles concurrently including product architect, optical architect, packet architect providing day to day mentorship and strategic technical leadership to multiple teams
• ☛ Managed a competent team and led board bring up activity for NCS4001 for both packet and optical ASICs based on PMC Sierra’s HyPHY20GFlex ASIC and EZChip’s NP4cL NPU and integrated with control plane PoCs
• ☛ Defined and prototyped system software architecture for NCS 4016 based on NGXR NOS
• ☛ Ported and Integrated packet transport architecture from ASR9K / VIKING to NCS platforms
• ☛ Technically led and reviewed execution with peak team sizes exceeding 200+ on products with unprecedented feature density and scale. Managed competent high performance small team sizes at various phases addressing system engineering, architecture, development and implementation.
• ☛Established expertise on an array of optical and packet technologies including OTN, SONET/SDH, DWDM, Career Ethernet, MPLS-TE, MPLS-TP, and IP!
• ☛Established expertise on CISCO’s router/switch NOS variants incl. XR, and NG-XR
• ☛Recently followed up on development of SDN/NFV/nV enabled applications based on CISCO’s ONE SDN solution and APIC controller for converged packet-optical solutions.
• ☛ Proposed architecture for enablement of packet nV and optical nV in NCS product line based on satellite technology.
• ☛Top performance appraisal ratings consecutively for 3 years backed by multiple awards, accolades, appreciation from Customer, Engineering, PLM & Program management alike

Sep 2009 – Sep 2010 · 1 yr · Noida Area, India

• ☛ Led Development of VDSL Bonding data plane solution on Fusiv SoC based CPE
• ☛ Design based on IEEE 802.3ah
• ☛ MicroCoding on Fusiv Accelerator Processor (AP) NPU
• ☛ Data plane testing and debugging on target boards
• ☛ Integration with control plane bonding driver
• ☛ Performance optimization of receive data path
• ☛ Interoperability with Tier1 CO vendors Alcatel ASAM/Stinger and delivery of production code
• ☛ Comparative analysis of Ikanos's Fusiv AP2AP hookup architecture with Conexant's LEAP driver
• ☛ Proposed unified glue layer APIs while minimizing # of invasive kernel hook-ups

Mar 2008 – Nov 2009 · 1 yr 8 mos · Noida Area, India

• ☛ Complete solution for integrating Conexant's ASIC based hardware packet acceleration engine (PoE) with multiple variants of Linux kernel network stack 2.6.24 or later on SoC CPE platforms.
• ☛ Analysis of hardware accelerator block and existing fast path
• ☛ Design and implementation of flow caching concept in Linux
• ☛ Glue layer API design and implementation
• ☛ Novel zero copy algorithm for buffer pool management
• ☛ Hookup of various Linux kernel NET stack modules with fast path
• ☛ Features: Bridging, VLAN, Routing, NAT, Netfilter, Conntrack,QDisc
• ☛ Exhaustive testing of above features with 300+ test cases defined
• ☛ Extended implementation above to support IPv6 core stack and IPv4/IPv6 dual stack coexistence
• ☛ Configured tunnelling (6over4, 4over6, 6to4, 4over6), ND, SLAAC, IPv6 Conntrack, ip6tables
• ☛ Solution to minimize kernel NET stack intrusion leveraging Linux’s Netfilter framework and reduced # of kernel tainted files by more than 70%
• ☛ Supported multiple customer releases on CPE SoC platforms for all Linux NET stack features with minimal support and relentlessly debugged several kernel panics/hangs/crashes!
• ☛ Managed and Technically mentored SoC Linux integration team that successfully implemented, verified and delivered CPE customer qualification cycles.

May 2005 – Nov 2007 · 2 yrs 6 mos · Bangalore, India

• ☛ Architected data plane pipeline for 10Gbps Core Router on Dual IXP28XX covering system requirements
• ☛ Implemented IPv4/IPv6 forwarder, MPLS (FTN and ILM), packet classification, metering, and hierarchical packet scheduling micro blocks
• ☛ Integrated the data path pipeline with customer control plane software via CCI / IXA acceleration framework
• ☛ Architected Data plane solution for IPSec VPN based security gateway based on IA based Tolapai NPU supporting complete analysis and design of IPSec VPN data plane pipeline
• ☛ Implemented IPSec micro blocks and supported integration with OpenSWAN IKE control plane
• ☛Designed Inline Security API for IP/VPN based forwarding
• ☛Led pre-sales and performance characterization for HSxPA MAC blocks on IXA ME
• ☛Executed technical leadership to multiple software engineering teams, RFI/RFP and software project management

Jun 2003 – May 2005 · 1 yr 11 mos · Helsinki, Finland

• ☛ Complete ownership of AmbOS IP control plane implementation for D500 IP DSLAM
• ☛ Complete IP stack integration with Agere 2.5G IP DSLAM data plane pipeline processor
• ☛ Design and implementation of DHCPv4 relay agent and integration with IP stack
• ☛ Design and implementation of DHCP Option 82 support

Feb 2002 – May 2003 · 1 yr 3 mos · Bangalore, India

• ☛ Developed MPLS-TE solution for VRPv5 platform covering requirement analysis of MPLS-TE (deputed to Beijing) for development of Quidway series routers
• ☛ L1 Software Architecture for MPLS-TE subsystem
• ☛ Software Design of RSVP-TE signalling stack
• ☛ Extensions to RSVP to support TE
• ☛ TE PCE (Dijkstra, and A*Prune algorithms)
• ☛ Addressed requirements for LDP, RSVP-TE, OSPF-TE, CSPF, BGP, MPLS IP VPNs

Aug 1999 – Feb 2002 · 2 yrs 6 mos · Bangalore, India

• ☛ Developed solution for VoATM-VoIP MGW IWF data plane solution on CPort C-5e NPU
• ☛ Design of VoATM-VoIP MGW reference application
• ☛ Static mapping of (VPI/VCI, AAL2 CID) to RTP (IP addr, port)
• ☛ Micro coding on C5-e (now defunct)
• ☛ Validation for RTP encoded media streams
• ☛ Worked on design/implementation of SIP proxy for 3GPP IMS
• ☛ Development of xCSCF protocol components
• ☛ Designed WAP based micro browser for Motorola handheld devices covering WAE design and implementation

Jan 1999 – Aug 1999 · 7 mos · Helsinki, Finland

• ☛ Designed WAP based micro browser for Nokia handheld devices covering WAE design and implementation
• ☛ Reviewed and studied various components of Nokia WAP protocol stack

Nov 1997 – Dec 1998 · 1 yr 1 mo · Gurgaon, India

• ☛ Developed SCCP/TCAP error detection, statistics, logger, system management software for HSS SS7 protocol stack and successfully delivered to NEC systems
• ☛ Developed comprehensive test suite in TTCN to validate SS7 protocol stack

May 1997 – Oct 1997 · 5 mos · New Delhi Area, India

• ☛ Attended several technical training on Ericsson's switching platform AXE-10
• ☛ Developed and disseminated training programmes on advanced mobile technology concepts based on AXE-10 platform