Abhishek Sagar
Staff Software Engineer at Calix
Bengaluru, Karnataka, India
Summary
👤
Senior🎓
Top SchoolAbhishek Sagar is a Staff Software Engineer based in Bengaluru with ~9 years of hands-on experience building and evolving high-performance network protocol software across Calix, Cisco, Juniper and Brocade. He specializes in advanced L2/L3 multicast and unicast routing (PIM, IGMP/MLD, ISIS, Segment Routing, SRTE), MPLS tunneling, and resilient fast-reroute mechanisms (LFA, rLFA, TILFA, PPLFA), and has driven feature work from SR prefix/adjacency SIDs to distributed CSPF and PCE integration. At Cisco he contributed to next-generation firewall features and IPv6 platform integrations for cloud/remote VPN scenarios, demonstrating a cross-domain fluency in routing and security. He is comfortable implementing low-level protocol mechanics and systems-level HA (NSR) while also delivering pragmatic product features like V6 DHCP proxy and policy-based adaptive routing. A dual IIT Bombay MTech graduate, he pairs deep routing protocol expertise with practical engineering that ships in carrier-grade products. An interesting detail: his career spans both chipset-scale multicast implementations and cloud-hosted firewall verifications, giving him rare end-to-end visibility from data plane to orchestration.
9 years of coding experience
11 years of employment as a software developer
Intermediate, Science, Intermediate, Science at Dayawati modi academyBachelor of Technology (BTech), Computer Science, Bachelor of Technology (BTech), Computer Science at Harcourt Butler Technological Institute, KanpurIndian Institute of Technology BombayMetric (10th), Mathematics and Computer Science, Metric (10th), Mathematics and Computer Science at St thomas english medium school
English
Stackoverflow
1,219reputation
187kreached
23answers
82questions
Github Skills (27)
parser10
multithreading10
callback10
tcp10
context-switching10
cli10
memory-allocation9
memory-leaks9
tcp-server9
linux9
shell9
cpp8
asynchronous8
rdbms7
mathematical-expressions7
Programming languages (3)
Github contributions (5)
sachinites/RDBMSImplementation
Jul 2023 - Jul 2026
Implement your own RDBMs
Contributions:165 pushes, 15 branches, 7 issues in 2 years 11 months
rdbms
sachinites/MemoryLeakDetector
Feb 2019 - Jul 2020
Library to catch Memory Leaks in C/C++ Programs
Contributions:15 commits, 12 pushes, 1 branch in 1 year 4 months
cppmemory-leaks
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