Harish Kumar
Full Stack Engineer
Built and scaled WatchWithMe to 7,000+ users with paying customers. Currently building Aegis — an AI system for querying and debugging production systems. Strong in real-time systems, observability, and distributed architecture.
About Me
Full-stack engineer with 5+ years of experience building scalable web and mobile applications. I built and scaled WatchWithMe — a real-time watch party platform — from zero to 7,000+ users with paying customers. Currently building Aegis, an AI system for querying and debugging production systems via natural language.
I care about measurable outcomes. At Fluid.travel (PickYourTrail), I revamped the hotel booking flow driving a 150% increase in bookings. At Klenty, I rebuilt the mail tracking system reducing latency from 15 minutes to 5 seconds. At Codedamn, I cut infrastructure costs by 55% through container allocation optimization.
My core strengths are real-time systems, observability, and distributed architecture. I was an invited speaker at Chennai Web Conf (Dec 2025) where I presented on "Artemis: Personal AI OS", focusing on AI-native applications and personal AI systems.
Experience
Frontend Developer (SDE II)
- Owned end-to-end mobile app development using React Native
- Migrated React Native 0.76 → 0.82, improving performance and stability
- Revamped hotel search & booking flow, resulting in 150% increase in bookings
- Built cancellation & reschedule policy module
- Developed Reports module for operational insights
- Automated GST invoice retrieval from Indigo flights (100–400 daily bookings)
Fullstack Developer (Consultant)
- Built offline sync functionality for mobile app
- Implemented multi-session sync across devices for MSMEs
- Developed SMS parsing for automated transaction recording
Full Stack Developer
- Implemented Zipkin distributed tracing for enhanced performance measurement
- Built real-time mail tracking system, reducing latency from 15 minutes to 5 seconds
- Designed MongoDB request attribution system for precise per-request observability
- Built slow query detection pipeline for infrastructure optimization
- Enabled precise debugging of performance bottlenecks across the stack
Senior IDE Engineer
- Built DSA playground with custom code execution stack
- Developed real-time collaborative coding editor
- Implemented autocomplete & IntelliSense features
- Reduced infrastructure cost by 55% through container allocation optimization
Member of Technical Staff
- Built advanced pivot table analytics system for cross-module data aggregation
- Implemented conditional formatting & script columns
- Enabled spreadsheet-like computations inside product
Skills
Languages
Frontend
Backend
Databases
Cloud & DevOps
Core Strengths
Projects
WatchWithMe
Real-time watch party platform (Web & Mobile). Scaled to 7,000+ users with paying customers. Built synchronized playback using WebSockets, integrated voice & video chat, and solved hard latency, drift & onboarding challenges.
7,000+ users • Paying customers
Job Genie
AI-powered toolkit designed to help job seekers apply smarter, not harder. Includes tools for generating personalized cover letters, email builder, and resume optimization for senior roles.
Stardust.app
Container deployment platform built on AWS Spot Instances with disaster recovery and one-command infrastructure provisioning via Pulumi.
Blog
I write about full-stack engineering, real-time systems, observability, and building AI-powered tools.
Read All ArticlesGet in Touch
I'm always interested in hearing about interesting projects and opportunities. Feel free to reach out!