Hi, I'm Varun Mittal

Backend Engineer

Backend Engineer with over 2 years of experience in building and scaling cloud-native, low-latency systems. Skilled in designing scalable microservices, creating event-driven architectures with Kafka, and optimizing database performance. Hands-on with Java, Spring Boot, Kotlin, Docker, and AWS.

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Varun Mittal

Skills & Expertise

Technologies and tools I work with

Programming Languages

Java
Kotlin
C++
SQL

Frameworks & Msg.

Spring Boot
Hibernate
JPA
Apache Kafka
Spring Security

Databases & Cache

PostgreSQL
MySQL
Redis
Clickhouse
NoSQL

Cloud & DevOps

Docker
Kubernetes
AWS
CI/CD
Git

Work Experience

My professional journey

Software Development Engineer

Roundcircle • Gurugram, Haryana
Jun 2025 - Present
  • Led end to end backend development of mailing service sending over 1000 e-mails/minute using event-driven architecture
  • Integrated custom logging libraries and Opentelemetry APM which reduced MTTR by 30%
  • Implemented JUnit testing framework to validate applications prior to production releases, significantly reducing deployment errors
  • Led the design and implementation of an end-to-end authentication mechanism using JWT and OAuth 2.0

Associate Software Engineer

OLX India (Indonesia) • Gurugram, Haryana
Jan 2024 - May 2025
  • Integrated super-dealer and premium packages feature which increased revenue by 15%
  • Migrated 40+ services from New Relic to Datadog which decreased MTTR by 40%
  • Built notification feature using Kafka which increased customer engagement and revenue by 15%
  • Optimized SQL queries, cutting average latency from 900ms to 100ms, reducing P99 page latency by 35%
  • Created reusable custom logging library in Java, decreasing development effort and MTTD by 20%

Education

My academic background

Bachelor of Technology in Computer Science

Chitkara University

Patiala, Punjab • June 2021 - June 2025

Professional Certifications

Certified Kubernetes Application Developer (CKAD)

Linux Foundation


Kubernetes and Cloud Native Associate (KCNA)

Linux Foundation

Featured Projects

Some of my recent work

Coupon Service

Scalable coupon management service serving 10,000+ daily users, with event-driven architecture for real-time distribution and fraud prevention mechanisms. Integrated caching to achieve sub-100ms response times.

JavaSpring BootKafkaRedisMySQL

Catalog Service

Catalog management microservice for package and product listings. Designed an optimized relational DB schema, integrated Redis caching, and built a CSV bulk upload feature with robust validation.

JavaSpring BootPostgreSQLRedisCSV Processing

Get In Touch

Let's work together on your next project

Email

2003er.varunmittal@gmail.com

Phone

+91-7508700324

Location

Gurugram, India