Full-stack engineer

Build.
Understand.
Improve.

I'm Priyaranjan Kumar — a Java backend and full-stack engineer building reliable applications, backend systems, and practical software products.

06Selected ProjectsFull-Stack& BackendProduction& Client Work
A little about me
Priyaranjan Kumar
Open to opportunities

Priyaranjan

Full-Stack Engineer · Java Backend

Building→Learning→Improving
PK / 01
01 / About

Engineering with intent.

I take products from requirements to implementation and deployment — across client applications, SaaS platforms, REST APIs, databases, authentication, and server infrastructure.

My current focus is Java backend development: Spring Boot, PostgreSQL, JPA/Hibernate, API design, system design, and scalable backend architecture.

JavaSpring BootPostgreSQLJPA / HibernateNode.jsReactMongoDBRedisREST APIsSystem DesignDockerGit
02 / What I Work With

What I Work With.

01

Backend Systems

REST APIs · Business Logic · Authentication · Authorization

02

Data Systems

PostgreSQL · MongoDB · Redis · Data Modeling · Caching

03

Application Architecture

Clean Architecture · Layered Architecture · SOLID · LLD · HLD

04

Product Engineering

Web Apps · Mobile Apps · SaaS · Client Platforms

05

Infrastructure

Linux · VPS · Git · Deployment · Background Processing

03 / Selected work

Things I've built.

04 / Journey

From building features to understanding systems.

Build

Started by turning ideas and requirements into working web applications and full-stack products.

Ship

Moved from individual features to complete applications — APIs, databases, authentication, mobile apps, deployment, and real client requirements.

Understand

Began going deeper into software engineering fundamentals: OOP, SOLID, clean architecture, data modeling, testing, caching, and system design.

Go Deeper

Now focused on Java backend engineering with Spring Boot, PostgreSQL, JPA/Hibernate, security, Redis, and distributed systems.

Keep Improving

The goal is simple: write software that works today, is understandable tomorrow, and can evolve when the requirements change.

05 / How I Work

Engineering principles.

Not a list of skills. A visual representation of how I think about building software.

Explore the loop
01Model

Understand the problem before writing the code.

Nodes, relationships, and domain boundaries take shape.

02Build

Turn the model into working software.

Layers connect the client, services, APIs, and data.

03Test

Verify the behavior, not just the happy path.

Requests, responses, edge cases, and failure paths become visible.

04Measure

Understand what the system is actually doing.

Signals reveal latency, throughput, and the cost of each decision.

05Improve

Find what can be made simpler, faster, or clearer.

Complexity dissolves as the system is refined.

06Scale

Design for the next requirement, not just the current one.

The architecture expands without losing its shape.

06 / Connect

Have a problem worth solving?

I'm interested in backend engineering, product development, and systems that have real users and real constraints.

Java Backend · Full-Stack · System Design