system_ready = true

Yuvraj Singh

BackendSystemsEngineer_

I build the infra layer that makes AI products ship — from vector search pipelines to real-time fleet APIs handling 10k+ events/sec.

Resume GitHub LinkedIn Contact

10k+ events/sec

Real-time fleet telemetry at Revolt Motors

AI Pipelines

RAG · OpenSearch · LangChain in production

0→1 Builder

Shipped 4 products from scratch to live users

// Professional timeline & impact

Revolt Motors

Electric Vehicle Company · India's first AI-enabled EV

Jun 2025 – Present

⚙ Backend Engineering

SWE

Built ITSM ticket management platform for operational issue tracking across internal teams
Developed QR-based marketing campaign platform for generating and managing campaign-specific QR codes across digital channels
Built software license management system tracking asset expiry and automating license lifecycle
Backend services using Node.js + TypeScript with GitHub Actions CI pipelines

🧪 Test Infrastructure

SDET

Architected Playwright + TypeScript POM framework automating 50+ critical workflows and 200+ API test cases — 60% reduction in manual regression
Owned Selenium + Java regression suite (150+ UI flows) with 95%+ CI stability via GitHub Actions
Built Appium Android automation covering booking, OTP login, document uploads — 85% critical path coverage
Reduced bug triage time 40% with Allure reporting: failure screenshots, trend dashboards, test categorization

⚙ Backend Engineering

SWE

Built ITSM ticket management platform for operational issue tracking across internal teams
Developed QR-based marketing campaign platform for generating and managing campaign-specific QR codes across digital channels
Built software license management system tracking asset expiry and automating license lifecycle
Backend services using Node.js + TypeScript with GitHub Actions CI pipelines

🧪 Test Infrastructure

SDET

Architected Playwright + TypeScript POM framework automating 50+ critical workflows and 200+ API test cases — 60% reduction in manual regression
Owned Selenium + Java regression suite (150+ UI flows) with 95%+ CI stability via GitHub Actions
Built Appium Android automation covering booking, OTP login, document uploads — 85% critical path coverage
Reduced bug triage time 40% with Allure reporting: failure screenshots, trend dashboards, test categorization

Node.jsTypeScriptPlaywrightGitHub ActionsCI/CDSystem Design

TLE Eliminators

Competitive Programming Platform · Ed-tech

Jan 2025 – Jun 2025

QA Engineer Intern

qa-log.sh

[PASS]Playwright suite → 20% defect reduction across release cycles

[LOAD]JMeter: 3 critical bottlenecks caught pre-release under load

[AUTO]Slack bug reports → 30% reduction in manual QA communication

[PASS]100+ endpoint coverage, documented via Postman collections

PlaywrightJMeterPostmanSeleniumSlack APIGitHub Actions

Backend Developer

Gopratle

Built highly secure REST APIs with robust JWT authentication → enforced strict role-based access control.
Engineered efficient media upload pipeline → handled large files and asynchronous processing with zero data loss.
Integrated scalable transactional email systems → ensured critical user communications were delivered instantly.

REST APIsJWTMedia PipelinesEmail SystemsSecurity

// Core systems and platforms built

JobHermes — AI Job Hunting Agent

TypeScriptNode.jsGPT-4oSQLitenode-cronPlaywright

Autonomous agent that scrapes, scores, and applies to jobs — runs daily at 9 AM IST

The challenge: Job hunting is unstructured noise. The challenge was building a system that could filter hundreds of listings down to ranked opportunities with zero manual effort daily.

Poshible.ai — POSH Act Q&A Platform

Node.jsOpenAIAWS S3OpenSearchGoogle AuthREST APIs

AI-powered legal Q&A serving 500+ daily queries at 95% accuracy

The challenge: Building a RAG pipeline that stays accurate on domain-specific legal content (POSH Act) — and handles abuse via subscription enforcement.

Dealership Recommendation Engine

Google Maps APIPostgreSQLRedisTypeScript

The challenge: Executing complex spatial distance calculations on the fly while maintaining sub-second API responses.

Dynamic QR Campaign Platform

Node.jsMongoDBAnalyticsReact

The challenge: Engineering a fault-tolerant redirection flow capable of surviving massive traffic spikes from live events.

// High-throughput, asynchronous pipeline design

PDF Q&A Semantic Pipeline

Client

Web or mobile client initiating the PDF upload and Q&A requests.

API Gateway

Node.js proxy handling auth, validation & rate limits.

Queue

BullMQ / Redis for asynchronous job buffering.

Worker

Serverless function extracting & chunking document text.

Vector DB

OpenSearch storing 1536-dimensional semantic embeddings.

LLM

OpenAI GPT-4o synthesizing the final answer from retrieved context.

//00 PHILOSOPHY

HowIthinkaboutengineering

//01

Systems over features.

I optimise for the system that enables 10 features, not the feature itself. I built a job-matching engine that can swap LLM providers without changing a line of business logic.

//02

Observability is not optional.

Shipping without metrics is guessing. I integrated OpenTelemetry tracing into our QR platform before launch day — because you can't fix what you can't see.

//03

APIs are contracts, not implementations.

Consumers shouldn't care how it works internally. I designed our core APIs so the entire underlying infrastructure could be swapped without breaking a single client integration.

//04

Boring technology wins.

Reach for Redis before a custom cache. Postgres before a NoSQL scramble. Battle-tested infrastructure is how you maintain uptime on systems that actually matter.

// Interactive data flow visualizations

Poshible.ai Document Q&A Pipeline

PDF InputUser uploads PDF

Node.js APIChunking & Parsing

Embeddings

OpenAIVector Generation

OpenSearchSemantic Search

Dealership Recommendation Workflow

ClientProvides Pincode

Express.jsRequest Handler

Geolocation API

Google MapsCoord Retrieval

Spatial Query

PostGIS/RedisNearest Match

// Tools and technologies I use to build

Why both tracks matter

I build the system

I design and ship backend systems — REST APIs, data pipelines, and internal platforms. At Revolt Motors I've built an ITSM platform, a QR campaign engine, and a license management system from scratch.

I make sure it holds

I also own the automation layer that keeps those systems production-stable. 200+ API tests, 150+ UI flows, Appium mobile coverage — all running in CI on every push.

"Most teams hire two people for this. I do both."

</>Yuvraj

Backend Systems

Node.jsTypeScriptREST API DesignPostgreSQLRedisDockerGitHub ActionsAWS S3

Test Infra

PlaywrightSeleniumAppiumJMeterPostmanAllureTestNG

AI & Tools

GPT-4o SDKOpenSearchPythonRAG DesignLangChainPrompt Eng

Backend Systems

Node.jsExpress.jsTypeScriptJavaScriptREST API DesignJWT + RBAC AuthMongoDBPostgreSQLSQLiteRedisAWS S3OpenSearchCloudinaryGitHub ActionsDockerCI/CD

Test Infrastructure

Playwright (TypeScript)Selenium WebDriverAppium (Android)JMeterPostmanTestNGAllure ReportingPOM ArchitectureAPI ValidationRegression StrategyPerformance TestingSTLCSDLC

AI & Tooling

OpenAI GPT-4o SDKLangChain conceptsVector embeddings (OpenSearch)RAG pipeline designPrompt engineeringPythonSQLJavanode-cronbetter-sqlite3cheerio

// Honest expectations for remote teams

Async-first communicator

I document decisions in writing, over-communicate blockers early, and ship working demos instead of long status updates.

IST timezone, flexible overlap

Based in India (UTC+5:30). I regularly overlap with EU morning (10am–2pm IST) and US evening. I default to deep work blocks, not infinite standups.

PR-driven, test-first mindset

Small, reviewable PRs with clear descriptions. I treat code review as knowledge transfer, not gatekeeping.

Let'sbuildsomethingthatscales.

Open to backend engineering, AI infra, and platform roles at product-first companies.
Remote · Full-time · Contract.

Send me a message View my resume

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yuvrajsingh2428 yuvrajsingh024 @itsyuvrajx