Available for opportunities

I'm Mayank Jain,
Software Engineer.

3+ years building scalable, high-performance systems at product-based startups. Specializing in full-stack engineering, POS integrations, and enterprise solutions that power real businesses.

3+
Years Experience
23
GitHub Repos
400+
LeetCode Solved
5+
Major Integrations

Engineering at Scale,
One Feature at a Time.

I'm a Software Engineer based in Delhi with 3+ years of hands-on experience building enterprise-grade products at Restroworks, a product-based startup revolutionizing the restaurant technology space.

My work spans the full stack — from architecting real-time POS billing systems and payment integrations to designing dynamic menu engines and enterprise dashboards that handle 100K+ records. I build open-source tools too — from in-memory databases in Go to distributed rate limiters on npm.

When I'm not shipping features, you'll find me grinding LeetCode problems (400+ and counting), exploring system design patterns, or building side projects with the latest web technologies.

Performance

35% faster API response times through query optimization & Redis caching

🏗️

Architecture

Event-driven, multi-tenant systems handling enterprise-scale workloads

🔗

Integrations

Payment gateways, loyalty systems, WhatsApp Business API & more

🛠️

Open Source

In-memory database (Go), distributed rate limiter (npm), and more on GitHub

Where I've Built Things

FEB 2023 — PRESENT
Software Engineer
Restroworks · Delhi
  • Integrated Gift Card & Loyalty Partners (Paytronix, Gyftr) with secure auth, driving 25% boost in customer retention
  • Spearheaded Game Card Flow Integration with Semnox systems, supporting 100K+ daily transactions for arcade clients
  • Designed WhatsApp E-Bill Integration via WhatsApp Business API, reducing paper usage by 60%
  • Implemented Pinelabs Payment Integration for unified card transactions and real-time settlement visibility
  • Built Staff Meal Management Module with rule-based allowances, optimizing meal programs by 20%
  • Pioneered Dynamic Menu Session System handling 10K+ items per session, reducing config time by 40%
  • Engineered enterprise dashboards with bulk import/export for 100K+ records and advanced invoice generation
  • Optimized APIs with Redis caching, indexing & aggregation pipelines — 35% faster response times, 15% fewer errors
+25% Retention 100K+ Txns/Day -60% Paper -35% Latency
OCT 2022 — JAN 2023
Software Engineer Intern
Restroworks · Delhi
  • Built a full-stack SPA for Product Management with Angular, Node.js, Express & MongoDB with real-time Socket.io updates, improving engagement by 40%
  • Created a multi-tenant Bug Tracking Platform using MEAN stack, OAuth, AWS SQS, SendGrid & S3
MEAN Stack Real-time Multi-tenant

Tools of the Trade

💻

Languages

JavaScript TypeScript Go C++
🌐

Frontend

React.js Angular HTML / CSS jQuery Bootstrap
⚙️

Backend

Node.js Express.js MongoDB Mongoose Redis
☁️

Cloud & DevOps

AWS S3 AWS EC2 AWS SQS AWS Lambda
🧠

Concepts

Data Structures Algorithms API Design DBMS System Design Agile
🔧

Tools & Platforms

Socket.io SendGrid OAuth Git REST APIs

Things I've Built

📹

Let'S Hangout

Real-time Video Platform

Real-time video chat app with authentication, video conferencing, group chat, private messaging, and screen-sharing powered by Agora's API.

React.js Node.js Express.js Agora API
📊

COVID-19 Tracker

Data Visualization Dashboard

Live dashboard presenting real-time global and country-specific statistics on COVID-19 cases, recoveries, and fatalities with interactive visualizations.

React.js Node.js Express.js REST API
🐛

Bug Tracking Platform

Multi-Tenant SaaS

Multi-tenant bug tracking system with OAuth authentication, AWS SQS for event-driven workflows, SendGrid notifications, and S3 file storage.

Angular Node.js MongoDB AWS OAuth

Numbers That Matter

35%

Faster Response Times

API optimization via Redis caching, indexing & aggregation pipelines

60%

Paper Reduction

WhatsApp E-Bill integration automating digital bill delivery

25%

Customer Retention

Loyalty & gift card partner integrations with seamless redemptions

40%

Config Time Saved

Dynamic menu session system with automated import/export

Beyond the Code

🏆

400+ LeetCode Problems

Consistently sharpening algorithmic thinking and problem-solving skills across data structures

🥇

1st Prize — KICCS D-Hack

Won first place at the departmental level hackathon at KIET Group of Institutions

🎯

Top 20 — AMI-TECHFIESTA 2020

Finalist in a competitive coding event organized by Amity Coding Club

Let's Build
Something Great

Whether you have an exciting project, a collaboration idea, or just want to say hello — I'd love to hear from you.