Hello! 👋

I'm Sumit Keshari

Backend Engineer

About Me

I'm a Backend Engineer with deep expertise in backend systems, workflow automation, and systems programming. Currently at ICICI Bank, I build high-throughput event-driven architectures and automate security operations (SOAR), significantly reducing manual overhead and incident response times. My engineering approach emphasizes performance, scalability, and robust architecture. I have a strong foundation in C++ systems programming, having built Redis-compatible in-memory databases and POSIX-compliant shells from scratch. I thrive on solving complex backend challenges, from spatial indexing and routing algorithms to orchestrating distributed system integrations.

Data Structures and Algorithms System Design (HLD) C++ Python Bash JavaScript Node.js Express.js REST APIs TCP Sockets SQL MongoDB Redis Process Management IPC Pipes Git Linux CMake

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Projects

01

Custom Redis Server — In-Memory Database Engine

Built a Redis-compatible TCP server from scratch in Node.js implementing 30+ commands across 7 data families, with a streaming RESP protocol parser, transactional semantics (MULTI/EXEC) with optimistic locking, and AOF persistence with configurable fsync policies. Developed a master-replica replication system with full handshake negotiation, RDB snapshot transfer, and real-time write propagation to connected replicas.

Node.jsJavaScriptRESP ProtocolDistributed Replication
02

Custom Unix Shell — POSIX Process Manager

Built a Unix shell in C++ featuring multi-stage pipeline execution via pipe()/dup2(), process lifecycle management with fork()/execvp()/waitpid(), background job execution with async zombie reaping, and I/O redirection with a save-restore fd pattern.

C++Systems ProgrammingIPC PipingProcess Lifecycle
03

Real-World Map Routing Engine

Engineered a routing backend that dynamically ingests real-world road networks from the OpenStreetMap Overpass API, implementing 5 pathfinding algorithms (Dijkstra, A*, Bidirectional Dijkstra) with custom MinHeap data structures and a spatial grid index for O(1) nearest-node lookups.

Node.jsGraph AlgorithmsSpatial IndexingOpenStreetMap
04

DevTinder — Developer Matchmaking Platform

Engineered a full-stack MERN application connecting developers, featuring a scalable Express backend with MongoDB, JWT authentication, and AWS SES integration. Built a responsive React frontend utilizing Redux Toolkit for state management, Tailwind CSS, and DaisyUI.

React.jsNode.jsExpress.jsMongoDBRedux ToolkitTailwind CSS

Experience

Senior Platform Engineer (Backend / SOAR) - M2

ICICI Bank

April 2025 - Present
  • Parallelized QRadar-XSOAR event fetching with ticket creation, cutting incident creation latency and improving fetch rate from 45% to 77% across 3,200+ monthly tickets
  • Automated break-glass account governance by ingesting alerts into SIEM and integrating with ServiceNow APIs to programmatically validate access timestamps against approved ticket windows, eliminating manual audits
  • Reconfigured idle DR-site engines to process active workloads, doubling overall compute throughput without changing the underlying active-passive failover guarantees
  • Participated in architectural evaluation for migrating a high-throughput automation platform, contributing to data persistence strategy discussions and stakeholder alignment across cross-functional teams
  • Mentoring and guiding 2 junior engineers through code reviews and architectural guidance, accelerating their ramp-up to independently owning and delivering automation modules within 3 months

Platform Engineer (Backend / SOAR) - M1

ICICI Bank

June 2022 - March 2025
  • Engineered Python-based workflow automation pipelines that eliminated 160 man-days of manual operations over 6 months, integrating with REST APIs across multiple third-party distributed systems and internal enterprise platforms
  • Reduced Mean Time to Respond (MTTR) by 90% by architecting event-driven response pipelines, processing high-volume asynchronous events through multi-stage data enrichment and rule-based decision engines
  • Automated SSL certificate lifecycle tracking by deploying a monitoring script that flags upcoming renewals 30 days in advance, preventing unplanned maintenance incidents in production
  • Built data enrichment pipelines ingesting raw data from heterogeneous sources through multi-stage transformations, producing standardized structured outputs for automated downstream decision-making
  • Automated the expired IOC lifecycle by developing a workflow that scans threat intelligence modules and programmatically generates downstream change requests post-validation, eliminating manual ticket creation for analysts

Education

Masters of Technology, Computer Science Engineering (CSE)

Indian Institute of Technology Jodhpur, Jodhpur (IITJ)

August 2020 – July 2022
  • Graduated with 7.5 GPA
  • First Runner Up: IS3, IIT Jodhpur's ACM Student Chapter Ideathon, 2022

Bachelor of Technology, Computer Science Engineering (CSE)

Guru Jambheshwar University of Science & Technology, Hisar (GJUS&T)

April 2016 – July 2020
  • Graduated with 8.02 GPA
  • Core computer science fundamentals and systems engineering