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Harveer Narwar

Backend engineer · Pune, India

I turn complex backend work into dependable products.

I'm Harveer, a Java backend engineer at Infosys. I build secure APIs, event-driven services, and the systems teams trust in production.

JavaSpring BootSQLKafkaJenkinsDockerRedisKubernetesDistributed Systems
See selected work GitHub
Harveer Narwar

Systems Engineer · Infosys

Pune, Maharashtra

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Selected work

Systems, not just screens.

A sample of the problems I've designed for: correctness, throughput, and easier operations.

All projects
01 / CASE STUDYIn Active Development

WalletPe

Personal fintech-inspired wallet architecture exploring event-driven state machines, Apache Kafka integration, and the Transactional Outbox pattern to solve dual-write inconsistency.

Java 21Spring Boot 3Apache KafkaPostgreSQLRedis
Read case study
02 / CASE STUDYImplemented

ADO Audit Automation Engine

High-throughput rule validation engine replacing manual compliance checks, reducing audit cycle times from 4-5 hours to 10-15 minutes (Infosys Insta Award Winner).

Java 17Spring BootOracle DBJUnit 5Mockito
Read case study
03 / CASE STUDYImplemented

ClinicSphere

Production-oriented medical appointment scheduling engine engineered in Spring Boot and PostgreSQL, utilizing pessimistic row-level locking to eliminate booking collisions under heavy contention.

Java 21Spring Boot 3PostgreSQLFlywaySpring Security
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Experience

Building enterprise backend systems

Production APIs, integrations, and automation at scale.

Infosys

Systems Engineer (Java Backend Developer)

Aug 2025 — Present

Pune, Maharashtra

Java 17/21Spring BootOracle DBREST APIsTMF StandardsJUnit 5MockitomTLSPostman

Core backend engineering for high-throughput B2B ordering and milestone integration platform connecting 650+ downstream telecom enterprise systems.

Key contributions

  • •Engineered and maintained 10+ mission-critical Spring Boot REST endpoints powering high-volume order state transitions and milestone tracking.
  • •Authored database schema updates and complex stored procedures for inbound/outbound request processing, payload transformation, and milestone generation.
  • •Configured mutual TLS (mTLS) with CA certificates for secure service-to-service communication across distributed enterprise nodes.
  • •Conducted extensive contract verification in Postman and authored JUnit 5/Mockito test suites before promoting builds across DEV, SIT, and PROD on Oracle WebLogic.

Measurable impact

Architected a centralized @ControllerAdvice global exception handler adhering to TM Forum (TMF) error specifications, replacing ambiguous 500 errors and reducing downstream partner triage time by 60%.
Received an Infosys Insta Award for independently designing an automated milestone audit tool that slashed verification cycles by 80–90% (from 4-5 hours to 10-15 minutes).

Problem solving

I like problems with sharp edges.

Competitive programming keeps my approach to algorithms, complexity, and edge cases deliberate.

Visit LeetCode profile

500+

problems solved

1734

peak contest rating

80–90%

audit effort reduced

Capabilities

A backend toolkit built for real work.

I care about the full path: service design, data integrity, asynchronous workflows, and reliable delivery.

01

Languages

Core programming and query languages used for backend logic and storage access.

Java (11/17/21)SQLC++PL/SQL
02

Backend Frameworks & APIs

Enterprise Java framework ecosystem and RESTful service design.

Spring Boot 3Spring SecuritySpring Data JPAHibernateREST API DesignJWT & RBAC
03

Messaging & Event-Driven Systems

Asynchronous processing, event pipelines, and distributed consistency patterns.

Apache KafkaTransactional OutboxEvent Sourcing PatternsIdempotent ConsumersDead Letter Queues (DLQ)
04

Databases & Storage

Relational data stores, in-memory caches, and migration tooling.

PostgreSQLMySQLOracle DBRedisFlyway Migrations
05

DevOps & Infrastructure

Containerization, automated testing, continuous integration, and server runtimes.

DockerGitPostman / NewmanJUnit 5MockitoMavenJenkinsOracle WebLogic
06

Engineering Fundamentals

Computer science theory, algorithm complexity, and high-level architectural patterns.

Data Structures & AlgorithmsConcurrency & Thread SafetyDatabase Isolation LevelsMicroservices ArchitectureSOLID PrinciplesDesign Patterns
Writing

Notes on building reliable software.

Concurrency, transactions, event-driven systems, and the engineering decisions behind them.

Read on Medium