Varun Kewlani

Backend Engineer

Noida, India 2+ yrs exp 85 · Excellent

About

Backend Engineer (Java / Spring Boot) with 2+ years of experience building production backend systems — microservices, JWT security, event-driven design (Apache Kafka), and Redis caching. Currently maintaining payment and booking backends at Webkul. Strong in OOPS, RESTful API design, SQL data modelling, and system design. Ship daily with AI-assisted development (Claude Code, Cursor, Copilot) — prompt and harness engineering, agent-driven implementation, review, and testing.

Skills & Expertise (27)

Spring Boot Intermediate

7.0/10

Years Exp

Git Intermediate

7.0/10

Years Exp

Kubernetes Intermediate

7.0/10

Years Exp

Docker Intermediate

7.0/10

Years Exp

AWS Intermediate

7.0/10

Years Exp

Microservices Intermediate

7.0/10

Years Exp

RESTful APIs Intermediate

7.0/10

Years Exp

Java Intermediate

6.5/10

Years Exp

OOP Intermediate

6.5/10

Years Exp

MySql Intermediate

6.5/10

Years Exp

Gradle Intermediate

6.0/10

Years Exp

Maven Intermediate

6.0/10

Years Exp

Kafka Intermediate

6.0/10

Years Exp

Redis Intermediate

6.0/10

Years Exp

Hibernate Intermediate

6.0/10

Years Exp

JPA Intermediate

6.0/10

Years Exp

Spring Security Intermediate

6.0/10

Years Exp

Spring MVC Intermediate

6.0/10

Years Exp

Concurrency Intermediate

5.5/10

Years Exp

Multithreading Intermediate

5.5/10

Years Exp

SOLID Intermediate

5.5/10

Years Exp

System Design Intermediate

5.5/10

Years Exp

Kong API Gateway Intermediate

5.5/10

Years Exp

Load Balancing Intermediate

5.0/10

Years Exp

JavaScript Php React.js

Work Experience

Software Developer

Webkul

May 2025 - Present

Own backend modules (booking, payments, order lifecycle) of a hotel booking platform used by clients worldwide. Built 6 payment gateway integrations over REST APIs and webhook callbacks, handling payment, refund, and transaction-state reconciliation for domestic and international clients. Executed performance optimization and root-cause analysis on refund-processing flows, cutting daily support cases by 90% (from 50+/day to near-zero). Automated the booking lifecycle notification pipeline (confirmations, check-in/check-out reminders) via scheduled cron jobs with concurrency-safe background job handling, removing manual dispatch entirely. Drove feature delivery with AI-assisted engineering: prompt and harness engineering to generate implementations, then hands-on review, refactor, end-to-end testing using JUnit, merge-conflict resolution, and PR reviews before merge. Maintained uptime across 2 client environments on AWS, resolving production incidents in real time and reviewing peer code.

Software Developer

YouWill Ideation

Apr 2024 - Apr 2025

Built KYC verification microservices (PAN, driving licence, device) and a communication Chhub service (email/SMS, consent capture) as independent Spring Boot services, cutting manual applicant review time by 40% via smart PDF onboarding forms (Angular) pre-filled from partner bank APIs. Decoupled banking microservices using Hibernate for ORM, Kafka for event-driven messaging, and Redis for caching — cutting database load, response times, and downtime.