Krishna Varshney | Software Engineer — AI Agents, Distributed Systems, Backend

varsh@portfolio — zsh

KV

varsh@portfolio:~$ whoami

Krishna Varshney

varsh@portfolio:~$ cat role.txt

>

varsh@portfolio:~$ ./current-focus

AI Agents Java & Spring Boot Distributed Systems Apache Kafka LangGraph

./view-work git clone cat resume.pdf

system-stats

1M+

Daily Records Ingested

S3, DuckDB & Kafka pipeline

95.8%

Execution Time Reduction

Cut data load from 2h to <5 min

<100ms

Production API Latency

Optimized complex SQL & indexing

$10K+

US Client Projects

Freelance systems & APIs delivered

Projects.app

IncidentPilot — AI-Powered Production Incident Remediation

clone

Autonomous LangGraph Agent

Autonomous multi-agent system that listens for production alerts, performs intelligent AST code search, isolates root causes, synthesizes targeted bug fixes, and submits verified PRs with zero human intervention required until final review.

→ Knowledge-First Code Retrieval: Combines Tree-sitter AST syntax parsing, SentenceTransformers semantic embeddings, call-graph dependencies, and pgvector similarity search to locate exact root-cause files across large codebases.

→ Sandboxed Verification Pipeline: Dispatches generated patches to isolated GitHub Actions runners, guaranteeing that fixes pass all unit & regression test suites before opening pull requests.

→ Security & Guardrails: Enforces HMAC webhook authentication, strict evidence validation, and restricted file-system boundaries for safe autonomous repository interaction.

LangGraph LangChain FastAPI Tree-sitter pgvector GitHub Actions Docker OpenAI / Groq API Python

PayFlow — Distributed Payment Processing Platform

clone

Hero Project

Enterprise-grade idempotent payment API backed by an immutable double-entry ledger engine and transactional outbox event architecture.

→ Double-Entry Ledger Accounting: Enforces absolute transaction integrity where debits and credits net to zero using immutable, insert-only database records rather than error-prone mutable balance updates.

→ Transactional Outbox & Kafka: Completely eliminates dual-write races between PostgreSQL and Apache Kafka, backed by exponential-backoff consumers and dead-letter queue (DLQ) isolation.

→ Idempotent Settlement Engine: Scheduled merchant settlement processor utilizing composite database uniqueness constraints, ensuring concurrent or repeated runs result in safe no-ops.

Java 21 Spring Boot PostgreSQL jOOQ Apache Kafka Docker Distributed Systems

SalesCode Delta Ingestion Platform

Production Architecture

Four-stage high-throughput ingestion platform powering Coca-Cola Argentina's 40,000+ enterprise users across 46 master-data entities.

→ 95.8% Processing Latency Drop: Engineered S3 delta-diffing algorithms replacing monolithic full cleanups, reducing data ingestion from 2 hours to under 5 minutes.

→ Distributed Stream Processing: Converted 20+ transformer jobs into a unified Apache Flink stream with entity-level topic publishing and failed-record dead-letter routing.

→ Idempotent Redshift & DuckDB Pipeline: Ingests 1M+ daily records and matches 7.2M recommendation rows with streaming S3 files and bounded memory.

Java Spring Boot Apache Flink Apache Kafka DuckDB Amazon Redshift AWS S3 jOOQ

NewsWave — Decentralized Content & AI Media Platform

clone open

Web3 & AI

Censorship-resistant decentralized publishing platform combining Ethereum Sepolia smart contracts, IPFS distributed storage, and real-time AI news synthesis.

→ Decentralized Storage & Immutability: Uses IPFS content-addressed hash storage for permanent, censorship-resistant article persistence with zero central server dependencies.

→ On-Chain Governance & Micro-Tipping: Solidity smart contracts deployed on Sepolia testnet managing cryptographic author attribution, content licensing, and wallet interactions.

→ AI Article Analysis: Integrated OpenAI API service generating instantaneous key bullet summaries, bias detection, and topic taxonomy.

React.js Node.js Solidity IPFS Web3.js OpenAI API Ethereum

CryptoCart — Web3 E-Commerce Checkout Engine

clone

FinTech

Non-custodial checkout infrastructure enabling direct cryptocurrency token transactions with automated on-chain verification and merchant notification webhooks.

→ On-Chain Transaction Verification: Real-time EVM event listener monitoring block finality and confirming payment states without centralized intermediaries.

→ Merchant Webhook Dispatcher: Automated cryptographic webhook dispatch ensuring secure, tamper-proof payment receipt delivery to merchant backends.

Node.js Express.js MongoDB Web3.js EVM REST APIs

UniBit Coinflip — Real-Time Gaming & State Engine

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Real-Time

High-frequency WebSocket multiplayer engine managing synchronized game rooms, provably fair randomness verification, and sub-50ms latency state updates.

→ Low-Latency WebSocket Hub: Scalable bi-directional room sessions broadcasting live state changes and bet matching with sub-50ms latency.

→ In-Memory Cache & Pub/Sub: Redis-backed distributed state management and message brokering ensuring zero state drift across concurrent player connections.

Node.js WebSockets Redis Distributed State Event-Driven

SendMeHugs — Anonymous Feedback & Interaction Platform

clone

Full-Stack

Scalable anonymous messaging and interaction platform featuring real-time notification streams, tokenized session security, and automated content moderation.

→ Live Event Dispatching: Real-time push notifications powered by WebSocket feeds and efficient MongoDB indexing for fast document retrieval.

→ Security & Moderation Filter: Rate-limiting middleware, XSS payload sanitation, and keyword profanity filtering protecting user integrity.

JavaScript Node.js Express.js MongoDB REST APIs WebSockets

Experience.log

SalesCode.AI | Technical Project Associate (Software Engineer)

Jul 2025 – Present • Coca-Cola Argentina account (40,000+ users) — Best Project of the Year

→Redesigned a 600K-row daily pipeline to delta processing, cutting ingestion time from ~2 hours to under 5 minutes.

→Built a scheduled pipeline processing ~1M records/day across 46 entities, integrating client APIs and S3, transforming via DuckDB, and publishing downstream through Kafka.

→Cut production API response times from ~5s to under 100ms via query profiling, indexing, and SQL optimization.

→Built an incremental Java job matching 7.2M daily records against order/invoice data with bounded memory via batched queries and streamed S3 files.

→Re-architected 20+ Java transformers into a distributed Flink pipeline with entity-level publishing and failed-record isolation for faster recovery.

→Migrated sales-compliance processing from S3 to Amazon Redshift with idempotent upserts, enabling late-arriving orders to update existing records without duplication.

Java Spring Boot Apache Flink Kafka jOOQ DuckDB AWS S3 Amazon Redshift

Techentia | Freelance Backend Developer

Jun 2024 – Nov 2024 • Remote, US Clients

→Delivered backend engagements worth over $10,000 total for U.S.-based clients, building Node.js/Express APIs for Web3 payment and marketplace platforms.

→Implemented WebSocket-based real-time event feeds for transaction status updates across client platforms.

Node.js Express WebSockets MongoDB Web3.js

skills.json

{

"Languages": [

"Java", "Python", "SQL", "JavaScript", "TypeScript"

],

"Backend & APIs": [

"Spring Boot", "FastAPI", "Node.js", "Express.js", "REST APIs", "WebSockets", "jOOQ"

],

"AI / Agent Systems": [

"LangGraph", "LangChain", "RAG", "Vector Embeddings", "Semantic Search", "Tree-sitter", "SentenceTransformers", "OpenAI/Groq API"

],

"Databases": [

"PostgreSQL", "MySQL", "MongoDB", "SQLite", "DuckDB", "Amazon Redshift", "pgvector"

],

"Data Engineering & Messaging": [

"Apache Kafka", "Apache Flink", "Event-Driven Architecture", "Stream & Batch Processing"

],

"System Design": [

"Distributed Systems", "Idempotent Processing", "Transactional Outbox", "Retry & Dead-Letter Handling", "Fault Tolerance"

],

"Cloud & DevOps": [

"AWS (S3, EC2)", "Docker", "Jenkins", "CI/CD", "GitHub Actions", "Git"

]

}

about.md

# 01. Engineering Background

Software engineer with 1+ years of production experience specializing in fault-tolerant backend architectures, high-throughput data pipelines, and production-grade LLM agent systems.

Currently at SalesCode.AI on the Coca-Cola Argentina account (40,000+ users), designing distributed master-data ingestion systems processing 1M+ daily records across 46 enterprise entities.

# 02. Core Architectural Invariants

Principles Over Hacks

▹ Zero Dual-Write Races: Enforce the Transactional Outbox Pattern to guarantee event emission consistency between relational stores and Apache Kafka.

▹ Immutable Ledger Balances: Insert-only double-entry bookkeeping ensuring every debit strictly balances a credit with mathematical certainty.

▹ Bounded-Memory Streaming: Process gigabyte-scale datasets using S3 delta diffing and Apache Flink stream pipelines to prevent JVM heap exhaustion.

▹ Sandboxed Agent Guardrails: Autonomous code-remediation agents must execute through isolated CI test gates before human pull request reviews.

# 03. Key Production Milestones

→ 95.8% Ingestion Latency Drop: Slashed 600K-row daily master sync from ~2 hours to <5 minutes using S3 delta extraction.

→ 50x API Performance Optimization: Reduced mission-critical query latency from ~5s to <100ms via SQL query profiling and compound indexing.

→ 7.2M Daily Record Matching: Built streaming Java workers joining client recommendations with bounded memory consumption.

→ Autonomous Incident Remediation: Authored IncidentPilot with LangGraph, Tree-sitter AST parsing, pgvector semantic search, and sandboxed GitHub Actions PR creation.

→ $10,000+ US Client Engagements: Delivered production-ready Node.js, WebSockets, and Web3 smart contract backends for global clients.

# 04. Education & Academics

🎓

ABES Engineering College, Ghaziabad — B.Tech in Computer Science
Nov 2022 – Jun 2026 • CGPA: 8.71 / 10 • Focus on Distributed Systems, DBMS, OS & Algorithms

🏫

DAV Fertilizer Public School — Class XII (CBSE)
Graduated 2021 • Score: 97.2%

# 05. System Status & Availability

Current Role Software Engineer @ SalesCode.AI

Current Account Coca-Cola Argentina (Best Project of the Year)

Location Gurugram, India (Open to Relocation)

Work Preferences Remote (Worldwide) / Hybrid / On-Site

Target Domains AI Agents • Distributed Systems • Backend

Contact varshney.kv1@gmail.com

contact.sh

$ ./hire-me

Let's Build Resilient Systems Together

Open to Software Engineer roles — AI agents, distributed systems, and backend. Relocatable.

📧 varshney.kv1@gmail.com 💼 Connect on LinkedIn