IK
Srayash Raj.devBACKEND & FLUTTER ARCHITECT
FULL STACK • BACKEND & FLUTTER ARCHITECT

CRAFTING HIGH-VELOCITY SYSTEMS & POLISHED APPS.

Hey, I'm Ishu Kumar. I architect resilient distributed backends in Go & Node.js, run sandboxed judges in Kubernetes, and ship end-to-end encrypted apps on Flutter & Google Play.

Ishu Kumar
SecuChat
Google Play Store
1st Prize Winner
TCS Tech Day 2026
EXPLORE WORK (6)WORK EXPERIENCE (4)
95%
JVM Startup Cut
Go Caches + K8s Judge
1,000+
Concurrent Users
Postgres / Redis Stresstest
5.5k+
OpenAPI 3.0 Lines
Smile Care Production API
1st Prize
TCS Tech Day & Webmaniac
National Hackathon Honors
SELECTED WORK • SYSTEMS & MOBILE

ENGINEERED WORKS

Every project represents a deep engineering challenge: untrusted pod sandboxing, zero-knowledge ECDH cryptography, and high-concurrency event platforms.

VIEW ALL 6 WORKS
Published on Google Play Store// 2026

SecuChat

Zero-Knowledge Cross-Platform Messenger

Cross-platform private messaging application published on the Google Play Store, implementing ECDH asymmetric key exchange for zero-knowledge end-to-end encryption across mobile and desktop platforms.

▹Built a cross-platform (Android, iOS, Web, Windows, macOS) private messaging app in Flutter, published live on the Google Play Store.
▹Implemented ECDH asymmetric encryption for end-to-end encryption of all messages, using the BLoC pattern for predictable state management.
FlutterBLoCFirebaseCloud FirestoreECDH EncryptionFCMCI/CD
Google Play Store Live • Zero-Knowledge Cryptography • BLoC ArchitectureDetails
LeetCode-Style Execution Engine// 2026

Code Runner Backend

Distributed Online Judge & Pod Sandbox

High-performance modular code execution platform similar to LeetCode, running untrusted multi-language user code inside strictly isolated Kubernetes pods with fine-grained CPU and RAM limits.

▹Built a fully modular code compiler and runner platform supporting public and private test cases, similar to an online judge (LeetCode-style).
▹Ran untrusted user code in isolated, containerized Kubernetes pods with strict memory, CPU, and time limits, correctly surfacing errors like TIME_LIMIT_EXCEEDED.
Go (Golang)KubernetesDockerJavaREST APISystem Design
95% JVM Startup Cut (26s → 5s) • K8s Isolated Pods • Pre-Warmed Go CachesDetails
AWS Bedrock Nova Lite & FAISS// 2026

RAG Tutor

Academic ERP with Socratic AI Guidance

FastAPI backend for a live academic ERP covering Admin, Student, and Teacher roles, featuring subject-wise Socratic RAG tutoring powered by AWS Bedrock (Amazon Nova Lite) with isolated FAISS vector indexes.

▹Built the FastAPI backend for a live academic ERP covering Admin, Student, and Teacher roles with JWT auth and Pydantic validation.
▹Implemented subject-wise RAG tutoring on AWS Bedrock (Amazon Nova Lite) with isolated FAISS indexes and MiniLM embeddings, enforcing Socratic questioning and mandatory source citations.
PythonFastAPISQLAlchemyAWS BedrockFAISSPostgreSQL
AWS Bedrock Nova Lite • MiniLM Isolated Indexes • Socratic VerificationDetails
🏆 1st Prize Winner — Webmaniac 2026// 2026

The Waited Chat

Cadence-Batched Real-Time Messaging

Innovative real-time messaging application deployed on Next.js and Vercel that queues outgoing messages until the sender completes their typing sentence, eliminating fragmented chat spam.

▹Built and deployed a messaging app on Next.js/TypeScript that queues outgoing messages until the sender finishes their sentence.
▹Won 1st Prize at Webmaniac (Academy of Technology) for the concept and execution.
Next.jsTypeScriptVercelWebSocketsTailwind CSS
🏆 1st Prize Winner @ Webmaniac 2026 • Live on VercelDetails
MediaPipe Gesture Engine & Three.js// 2026

DJ Roots

Touchless 3D Crowd-Controlled Audio System

Real-time, crowd-controlled DJ party platform with an interactive 3D interface for democratic track voting, Po-Token bypass audio backend, and camera hand-gesture control.

▹Built a real-time, crowd-controlled DJ system with a 3D interface for democratic queue voting.
▹Wrote a custom Node.js backend using yt-dlp for audio extraction that bypasses Po-Token and geo-blocking restrictions.
React 19SupabaseNode.jsThree.jsGoogle MediaPipeyt-dlp
Google MediaPipe Hand Gestures • Supabase Realtime • yt-dlp Po-Token BypassDetails
CORE SYSTEMS PHILOSOPHY

ENGINEERED FOR SCALE & RESILIENCE

The foundational engineering patterns behind every backend, distributed worker, and mobile application Ishu Kumar builds.

Clean Architecture

Strict decoupling of repositories, domain use-cases, and centralized dependency injection in Node.js & TypeScript.

// Node / Express

Sandboxed Pod Isolation

Executing untrusted multi-language user code inside strictly bounded Kubernetes pods with wall-time, memory & CPU limits.

// Go / K8s / Docker

Zero-Knowledge Security

End-to-end ECDH asymmetric cryptography, refresh token rotation, TOTP 2FA, and strict schema validation.

// Flutter / Cryptography

High-Throughput Queues

Pre-warmed caches, BullMQ redis queues, and real-time WebSockets stress-tested to 1,000+ concurrent users.

// Redis / BullMQ / Drizzle
COMPETITIVE HACKATHONS & HONORS

RECOGNITION & AWARDS

Consistently leading and winning high-stakes competitive hackathons through novel technical architectures and rapid deployment.

READ STORY & BIO
🥇 1st Prize Winner

1st Prize — TCS Technology Day 2026

// Tata Consultancy Services

Led the engineering team that built Bag Packer — an NLP-driven search and intelligence application featuring deep Model Context Protocol (MCP) server integrations.

▹Architected MCP server tools connecting LLM agent context with structured inventory workflows
▹Engineered real-time semantic query decomposition and fast natural language parsing pipelines
▹Secured 1st Place overall against top engineering institutions across the state
PROJECT: Bag PackerTeam Lead & Core Architect
🥇 1st Prize Winner

1st Prize — Webmaniac 2026

// Academy of Technology

Conceived, engineered, and deployed The Waited Chat — a novel real-time messaging application that queues outgoing messages until the sender finishes their sentence cadence, preventing broken message spam.

▹Built a custom typing cadence detector that batches outbound messages without awkward delays
▹Shipped live to production on Next.js, TypeScript, and Vercel at the-waited-chat.vercel.app
▹Awarded 1st Prize for both technical execution and innovative real-time communication design
PROJECT: The Waited ChatSole Developer & Architect
// OPPORTUNITIES & COLLABORATIONS

HAVE A COMPLEX ENGINEERING PROJECT?

Open to high-impact software engineering roles, distributed systems contracts, or innovative Flutter mobile builds.

GET IN TOUCH NOW ↗ABOUT ISHU