Welcome to my portfolio

Hello, I'm
Pappu Kumar

I'm a_

Crafting high-performance scalable web systems and robust backend architectures with modern technologies. Let's turn your complex ideas into efficient digital reality.

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Years Experience

10+

Projects Completed

About Me

Learn more about my Journey

Education

B.Tech

CSVTU

2018 - 2022

Intermediate of Science

JDS (+2) School Khilwat

2018

Matriculation

Cambridge Public School Patna

2015

My Story

Hello! I am Pappu Kumar, a Software Engineer with ~2 years of professional experience specializing in building backend-heavy full-stack systems. My core expertise lies in designing robust architectures using Node.js, Next.js and scaling complex applications.

I have strong experience in designing REST APIs, implementing secure authentication workflows, and integrating seamless payment gateways. My work involves handling sensitive financial data and ensuring compliance in fintech domains like loans and insurance.

Beyond the backend, I have solid frontend exposure using React and Next.js, allowing me to deliver complete end-to-end features. I am comfortable bridging the gap between database schema design and user interface implementation.

I thrive on building real-time communication systems and optimizing performance for high-load environments. Whether it's containerizing services with Docker or deploying on AWS, I enjoy the entire lifecycle of software development.

My Philosophy

Technical Core Values

Scalability First

Designing systems that grow with demand, ensuring high availability and seamless expansion.

Security by Design

Implementing robust security protocols and encrypted workflows to safeguard user data.

Efficient Performance

Optimizing every line of code and database query for lightning-fast response times.

Experience

10+

Projects

Global Reach

10,000+

Coding Hours

My Timeline

Professional Experience

Software Engineer

SenseGrass

06/2025 – Present

Bengaluru, India

Continued contributing in an equity-based capacity post full-time tenure.
Fixed production bugs, improved system stability, and optimized existing APIs.
Added incremental backend features and enhancements based on business needs.
Supported deployments, environment fixes, and production troubleshooting.
No exclusivity or conflict of interest; open to full-time opportunities.

SDE

SenseGrass

04/2024 – 05/2025

Bengaluru, India

Designed and developed backend APIs using Node.js and Express to support loan, insurance, and payment workflows handling sensitive financial data.
Implemented authentication and authorization mechanisms to secure backend services and control access across user roles.
Integrated identity verification workflows including Aadhaar/PAN, eKYC, and OTP, ensuring compliance and secure data handling.
Implemented payment processing and payout flows using Cashfree and EscrowPay, including EMI handling and scheduled background jobs.
Designed and optimized database schemas and queries using PostgreSQL and MongoDB, improving API response times and system reliability.
Implemented real-time communication using WebSockets to deliver low-latency notifications and status updates.
Contributed to existing Spring Boot microservices by fixing production issues and extending API functionality where required.
Collaborated with frontend engineers to integrate backend APIs with React / Next.js clients, ensuring consistent data flow and secure API usage.
Deployed backend services on AWS EC2 using Terraform, following a GitOps-style workflow where infrastructure and deployments were managed through version-controlled pipelines.
Deployed and managed Next.js frontend applications on AWS EC2, integrating them with backend APIs and ensuring reliable production access.
Worked closely with product and design teams to deliver complete features from backend logic to frontend integration.

Software Engineer

Matriot Solutions

03/2023 – 03/2024

Bengaluru, Karnataka

Modernized backend services by upgrading Node.js versions and migrating databases from MongoDB to MySQL, improving reliability and query performance.
Built and maintained backend APIs supporting real-time IoT and monitoring use cases.
Implemented real-time communication using WebSockets and MQTT, improving data delivery and system responsiveness.
Developed Python-based internal tools for logging, monitoring, and socket-based diagnostics to support backend operations.
Containerized backend services using Docker, improving deployment consistency and reducing release-related issues.
Collaborated with cross-functional teams to align backend systems with scalable and cloud-ready architecture practices.

My Portfolio

Featured Projects

Full Stack System

Real-Time Messaging Platform

Designed and built a backend-first real-time messaging platform supporting secure authentication, 1:1 chats, group chats, and status updates, similar to modern messaging applications.

Designed and developed UI/UX using Next.js for core features like auth, chats, and status with focus on responsiveness.
Implemented secure signup/login using phone number as single source of truth.
Built 1:1 messaging and Group chats with strict role-based access control (Admin/Member).
Implemented Status (Stories) with privacy controls based on chat interactions.
Used WebSockets for real-time delivery, typing indicators, and presence updates.
Integrated Redis for presence tracking, caching metadata, and reducing DB load.
Designed hybrid architecture using REST for synchronous ops and WebSockets for real-time events.
Ensured stateless backend services using PostgreSQL and Redis for horizontal scalability.
Used Prisma ORM for type-safe database access and migrations.
Containerized backend with Docker and implemented GitOps workflows using Terraform for AWS deployment.