Full-Stack Engineer · Delhi NCR, India

Building systemsthat scale.

I'm Kartikey — I build the layer between messy data and shipped product: scraping and enrichment pipelines, vector search, and backends engineered for millions of users.

View workRésumé
Kartikey Sangal
5M
Users supported
<3%
Email bounce rate
100+
API calls / sec
250+
DSA problems solved
Scroll

Currently

Full-Stack Engineer at The Ladder AI

Sep 2025 — Present · Gurgaon, India

  • Engineered automated scraping pipelines with Playwright, extracting and structuring data from multiple sources.
  • Built enrichment workflows appending person-level data, validating emails to under a 3% bounce rate.
  • Designed scalable NestJS backend systems for app + web LMS, supporting up to 5M active users.
  • Ran client meetings on technical strategy, requirements and delivery.
  • 01

    Data pipelines

    Playwright scrapers and enrichment workflows that turn scattered sources into structured, validated records.

  • 02

    Backend systems

    NestJS and Node services designed for scale — queues, pub-sub, caching, and schemas that hold up under load.

  • 03

    Applied AI

    Embeddings and vector search with Pinecone and HuggingFace, plus LLM features wired into real products.

Experience

Where I’ve worked

Sep 2025 — Present

The Ladder AI

Full-Stack Engineer

Gurgaon, India

  • Engineered automated scraping pipelines with Playwright, extracting and structuring data from multiple sources.
  • Built enrichment workflows appending person-level data, validating emails to under a 3% bounce rate.
  • Designed scalable NestJS backend systems for app + web LMS, supporting up to 5M active users.
  • Ran client meetings on technical strategy, requirements and delivery.
NestJSPlaywrightNode.jsPostgreSQL

Mar 2024 — Aug 2025

Jurix AI

Full-Stack Intern

Remote

  • Architected the complete frontend and backend for an AI-powered legal research platform from inception.
  • Integrated AI models and legal data APIs for intelligent case-law search and document analysis.
ReactNode.jsAI/LLM APIsMongoDB

2022 — 2026

ABES Engineering College, Ghaziabad

B.Tech, Computer Science Engineering

  • GPA 7.8 / 10

Selected work

Things I’ve built

Five projects taken end to end — data model, backend architecture and interface. Numbers below are measured in production, not estimated.

012025

CrMint

Full-stack CRM with pub-sub campaign delivery

A CRM platform for personalized campaign delivery. Publisher-subscriber architecture handles 100+ API calls per second with zero downtime; Redis streams ingest 500+ customer interactions a minute. 99.9% uptime in production.

100+
calls/sec
99.9%
uptime
500+
events/min
Node.jsRedisReactGroq LLMMongoDBOAuth
Live ↗Source ↗
022025

Time2Qualify

AI assessment recommender on vector search

Recommendation engine that reads a job description and surfaces the top 10 candidate assessments. 150+ SHL assessments embedded with HuggingFace and served from Pinecone with decimal relevance scoring.

150+
vectors indexed
top 10
ranked matches
Node.jsExpressPineconeHuggingFaceMongoDBJWT
Source ↗
032025

bookMyGo

Ticket-booking service written in Go

A ticket booking backend built in Go — concurrency-first design for seat-locking and booking flows.

GoRESTConcurrency
Source ↗
042025

gitstatCLI

A friendlier CLI for git

A developer-experience layer over git: human-readable status and stats, fewer flags to memorize.

JavaScriptNode.jsCLI
Source ↗
052025

CosmomcShop

Minecraft SMP in-game purchases site

Storefront for a Minecraft SMP server — in-game purchases, built in TypeScript.

TypeScriptReact
Source ↗

Toolkit

The stack I reach for

Frontend

5
  • Next.js
  • React
  • TypeScript
  • Tailwind CSS
  • Three.js

Backend

6
  • NestJS
  • Node.js
  • Express
  • Fastify
  • Python
  • Go

Data

6
  • PostgreSQL
  • MongoDB
  • Redis
  • Pinecone
  • Prisma
  • MySQL

Tooling

6
  • Docker
  • AWS
  • Git
  • Playwright
  • HuggingFace
  • Postman

250+

DSA problems solved

LeetCode, GFG

1600+

LeetCode rating

Contest rated

Merged

GSSoC contribution

MediaRecorder PR → Placify

PCAP

Cisco certified

Python + CCNA introduction

Contact

Let's build something.

I'm open to full-time roles and interesting freelance work. The fastest way to reach me is email.

or email directly
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