Senior full-stack software engineerAvailable remote

Niraj Kumar builds dependable software.

I’m a senior full-stack software engineer in India with 6+ years of experience delivering AI SaaS products, Node.js backends, Next.js applications, enterprise workflows, and AWS cloud systems.

Discuss a projectExplore case studies
  • 6+ years of delivery
  • 20+ production projects
  • Remote-ready collaboration

6+

Years of Experience

20+

Production Projects

3

Detailed Case Studies

4

Technical Deep Dives

How I help

Senior engineering where delivery gets difficult.

I work with founders, product teams, and engineering teams that need one person to connect product decisions, software architecture, implementation, and production operation.

Service 01

AI SaaS & product engineering

Production-ready Next.js products, AI and RAG workflows, multi-tenant permissions, billing, and integrations.

  • Product experiences
  • Secure AI workflows
  • SaaS foundations
Explore engineering services
Service 02

Backend & enterprise systems

Node.js services, PostgreSQL data models, Redis and queues, enterprise SSO, auditability, and operational workflows.

  • API architecture
  • Data and job systems
  • Security boundaries
Explore engineering services
Service 03

Cloud delivery & reliability

Failure-aware AWS architecture, Docker delivery, CI/CD, observability, recovery paths, and production readiness.

  • AWS architecture
  • Repeatable deployment
  • Operable systems
Explore engineering services

Selected production work

Complex systems, explained through real decisions.

All case studies
AWS Backend Architecture01

Event-Driven Document Synchronization on AWS

The design contains partial failures, scales each integration independently, gives operators an explainable document state, and makes search visibility a deliberate consistency guarantee rather than a timing assumption.

Amazon EventBridgeAmazon SQSAWS Lambda
Read the case study
Enterprise Platform02

Enterprise Document Pipeline Monitor

Authorized users gained permission-based document management and paginated pipeline visibility, with database audit events and S3 versioning preserving an attributable, recoverable change history.

Angular 21PrimeNG 21Tailwind CSS
Read the case study
Regulated Marketplace03

AI-Powered Cannabis Compliance Marketplace

The architecture connected domain research, AI document intelligence, backend modeling, compliance workflows, and full-stack product delivery into one maintainable platform direction.

Next.jsReactNode.js
Read the case study

Engineering depth

One engineer across the system.

I can move from user flows and interfaces into APIs, data models, queues, AI pipelines, cloud deployment, and production troubleshooting without losing the product context.

More about Niraj

Frontend

01
React.jsNext.jsAngularTypeScriptJavaScriptTailwind CSS

Backend

02
Node.jsExpress.jsNestJSREST APIsGraphQLWebSockets

Data

03
PostgreSQLPrisma ORMMySQLMongoDBRedis

Cloud

04
AWSDockerCI/CDGitHub ActionsNginxCloudflare

AI engineering

05
OpenAIClaude AIRAGOCRPrompt EngineeringDocument Intelligence

Technical authority

Production lessons for engineers who need the details.

Node.js production trace highlighting event loop blocking and API latency across concurrent requests.
Latest engineering article · 22 min read

How to Diagnose Node.js Event Loop Blocking in Production

Learn how to measure Node.js event loop delay and utilization, find CPU-bound code, distinguish I/O waits from blocking, and safely use worker threads in production.

Read the deep dive
15 lessons

Featured course

Production Notification System Design

A production-grade system design course for building notification platforms with event-driven architecture, queues, workers, PostgreSQL, Redis, email, SMS, push notifications, monitoring, security, and scaling.

Start learning
Technical articles4 production deep divesSystem design tutorials15 structured lessonsDeveloper toolsPractical browser utilities
Available for Global Remote Contracts

Need senior ownership from architecture to production?

Share the product goal, current stack, hardest constraint, and expected timeline. I’ll help turn it into a credible engineering path.

Start a conversation View resume