A professional dietitian needed a complete digital presence — a patient-facing web application with BMI calculation, appointment booking, two-way email notifications, and an SEO-optimised portfolio to attract new clients through organic search and digital marketing.

Dietomoumi.in

Open Live

Dugguz Delight — Multicuisine Restaurant Platform

View Case Study

Retail

Next.jsSpring BootPostgreSQLJWT

Dugguz Delight — Multicuisine Restaurant Platform

A multicuisine restaurant needed a complete digital transformation — a customer-facing website with online ordering, table reservations, and reviews, plus an admin panel to manage menu items, track orders, and handle revenue reporting.

Next.jsFirebaseRazorpayTailwind CSS

Super Gearz — Online Sports E-Commerce Platform

Super Gearz needed a full-fledged online sports e-commerce platform with secure payment processing through Razorpay, user authentication, shopping cart, order tracking, and an admin dashboard to manage products, inventory, and orders — all with a fast, modern shopping experience.

JavaSpring BootKafkaPostgreSQL

FinTech Payment Processing Platform

PayBridge needed a high-throughput payment processing system capable of handling 10,000+ concurrent transactions with 99.99% uptime, PCI-DSS compliance, and real-time fraud detection — all within a 4-month deadline.

PayBridge Solutions

View Case Study

Healthcare

Next.jsReact NativeSpring BootPostgreSQL

Healthcare Telemedicine Platform

MediConnect wanted to build a HIPAA-compliant telemedicine platform supporting video consultations, prescription management, appointment scheduling, and electronic health records — accessible on web and mobile.

MediConnect India

View Case Study

Healthcare

React.jsNode.jsExpressNodemailer

How I Work

MY PROVEN PROCESS

Discover

Understand your goals, users, and requirements to define a clear roadmap.

Project brief

Tech architecture

Timeline plan

Project briefTech architectureTimeline plan

Design

Create wireframes, prototypes, and polished UI that users love.

Wireframes

Figma prototype

Design system

WireframesFigma prototypeDesign system

Develop

Build with clean, scalable code using agile sprints and regular demos.

Clean code

Unit tests

API docs

Clean codeUnit testsAPI docs

Deploy

Ship with CI/CD, cloud setup, domain, SSL — zero downtime guaranteed.

Docker setup

CI/CD pipeline

Cloud infra

Docker setupCI/CD pipelineCloud infra

Support

Ongoing monitoring, bug fixes, and feature updates post-launch.

Monitoring

Bug fixes

New features

MonitoringBug fixesNew features

See My Full Process

Achievements

I TAKE PRIDE IN
MY ACCOMPLISHMENTS

Key milestones and measurable outcomes from my engineering career.

20+Projects Completed

3+Years Experience

15+Technologies Mastered

50+REST APIs Designed

Client Delivery

From Idea to Live Product — End to End

Built and shipped real client platforms like Dietomoumi's healthcare booking system and Dugguz Delight's restaurant management app — handling everything from UI design to deployment.

Full-Stack Range

15+ Technologies, One Trusted Developer

React, Next.js, Spring Boot, Firebase, PostgreSQL, Docker — I pick the right stack for each project. From Razorpay payments to JWT auth, I cover every layer of the stack.

Real Impact

50+ APIs Powering Live Businesses

Every API I design serves a real purpose — BMI calculators, appointment bookings, order processing, revenue tracking. These aren't prototypes, they're production systems driving real revenue.

CLIENT REVIEWS & RESULTS

DON'T JUST TAKE
MY WORD FOR IT.

Authentic feedback and measurable outcomes from founders, CTOs, and growth leaders who partnered with me to build their software products.

100%

Job Success

5.0 ★

Client Rating

20+

Projects Shipped

E-Commerce & Web App

Impact: +180% Order Growth

“Soumik built our custom retail web application with Next.js and PostgreSQL from scratch. The checkout is blazingly fast, and our online customer orders grew by 180% within two months of launch.”

Aarav Sengupta

Founder & CEO, RetailPulse

Kolkata, India

Mobile App & Web Portal

Impact: 99.9% System Uptime

“Soumik developed both our web dashboard and cross-platform React Native mobile app ahead of schedule. The application handles high daily user traffic effortlessly with rock-solid security.”

Priya Sharma

Founder & MD, HealthTech India

Bengaluru, India

Backend & Cloud DevOps

Impact: 40% Faster Query Speed

“Soumik optimized our Spring Boot microservices backend and PostgreSQL database queries, boosting performance by over 40%. His technical depth and engineering standards are exceptional.”

Anirban Roy

Head of Engineering, FinPay Digital

Kolkata, India

SEO & GEO Optimization

Impact: Page #1 Google Rank

“Our website search rankings jumped to Page #1 on Google, and we started appearing in ChatGPT Search and Perplexity AI recommendations. Soumik's SEO & GEO strategies doubled our organic leads.”

Sneha Chatterjee

Co-Founder, EdTech Horizon

Delhi NCR, India

Agentic AI Chatbot

Impact: 75% Auto Resolution

“Soumik built an autonomous AI support agent that handles customer tracking queries 24/7 on WhatsApp and Web. It resolved 75% of support tickets automatically without human intervention.”

Vikramaditya Roy

Director of Operations, LogiMove

Mumbai, India

Digital Marketing & CRO

Impact: -35% Acquisition Cost

“Our Google Ads and Meta paid campaigns were losing money until Soumik restructured our conversion funnels and landing pages. Our customer acquisition cost dropped by 35% in 30 days.”

Rohan Malhotra

Marketing Director, BrandNexus

Remote / USA

E-Commerce & Web App

Impact: +180% Order Growth

“Soumik built our custom retail web application with Next.js and PostgreSQL from scratch. The checkout is blazingly fast, and our online customer orders grew by 180% within two months of launch.”

Aarav Sengupta

Founder & CEO, RetailPulse

Kolkata, India

Mobile App & Web Portal

Impact: 99.9% System Uptime

“Soumik developed both our web dashboard and cross-platform React Native mobile app ahead of schedule. The application handles high daily user traffic effortlessly with rock-solid security.”

Priya Sharma

Founder & MD, HealthTech India

Bengaluru, India

Backend & Cloud DevOps

Impact: 40% Faster Query Speed

“Soumik optimized our Spring Boot microservices backend and PostgreSQL database queries, boosting performance by over 40%. His technical depth and engineering standards are exceptional.”

Anirban Roy

Head of Engineering, FinPay Digital

Kolkata, India

SEO & GEO Optimization

Impact: Page #1 Google Rank

“Our website search rankings jumped to Page #1 on Google, and we started appearing in ChatGPT Search and Perplexity AI recommendations. Soumik's SEO & GEO strategies doubled our organic leads.”

Sneha Chatterjee

Co-Founder, EdTech Horizon

Delhi NCR, India

Agentic AI Chatbot

Impact: 75% Auto Resolution

“Soumik built an autonomous AI support agent that handles customer tracking queries 24/7 on WhatsApp and Web. It resolved 75% of support tickets automatically without human intervention.”

Vikramaditya Roy

Director of Operations, LogiMove

Mumbai, India

Digital Marketing & CRO

Impact: -35% Acquisition Cost

“Our Google Ads and Meta paid campaigns were losing money until Soumik restructured our conversion funnels and landing pages. Our customer acquisition cost dropped by 35% in 30 days.”

Rohan Malhotra

Marketing Director, BrandNexus

Remote / USA

FREQUENTLY ASKED QUESTIONS

COMMON QUESTIONS

Timelines vary by scope. A small web app takes 4-8 weeks, a medium full-stack project 2-4 months, and enterprise-grade systems 4-8 months. As a freelance developer, I provide a detailed timeline during the Discovery phase and keep you updated at every sprint.

I work with everyone — from early-stage startups building their MVP to established enterprises modernizing their systems. As a freelance developer, my flexible engagement models adapt to your needs and budget. I'm especially passionate about helping startups launch their first product.

Every project includes post-launch support (duration depends on the scope). I handle bug fixes, monitoring, and minor updates. For ongoing needs, I offer freelance retainer packages and dedicated hourly/monthly arrangements.

Every line of code goes through peer code reviews, automated testing (unit + integration), linting, and security scans. I follow clean architecture principles and industry best practices. As a freelance developer, my reputation depends on the quality I deliver.

Absolutely. I offer staff augmentation, pair programming, and consulting models where I integrate directly with your team. I adapt to your tools, processes, and communication channels. Many clients hire me as a freelance extension of their in-house team.

I specialize in Java, Spring Boot, React, Next.js, TypeScript, PostgreSQL, Redis, Docker, Kubernetes, and Kafka. But I choose technologies based on what's best for your specific project, not one-size-fits-all.

Simply reach out via the contact form or email. We'll start with a free 30-minute consultation to understand your project. I'll then provide a detailed proposal with timeline, cost, and approach. You can hire me for fixed-price projects or on an hourly/monthly basis.

Every project is unique, so I provide custom quotes based on scope, complexity, and timeline. I offer competitive freelance rates for startups and businesses of all sizes. Contact me for a free estimate — no obligation.

Yes! I offer flexible freelance retainer packages for ongoing development, maintenance, monitoring, and feature additions. Many of my clients maintain long-term freelance relationships for continuous product evolution.

Yes, 100%. I sign a strict NDA before discussing sensitive project details. Upon full payment, 100% of the intellectual property (IP) rights, source code, design files, and deployment assets belong entirely to you.

Engineering Insights & Deep-Dives

LATEST ARTICLES &
TECHNICAL GUIDES

In-depth system architecture decisions, backend performance tuning, AI engineering, and modern DevOps strategies written by Soumik Mukherjee.

Explore All Articles (6)

Engineering Autonomous Agentic AI Assistants with Next.js 15 & Gemini 2.0

★ FEATURED GUIDEAI Engineering

2026-07-28•10 min read•9.4k views

Engineering Autonomous Agentic AI Assistants with Next.js 15 & Gemini 2.0

A deep technical dive into building Production-Ready Agentic AI workflows with streaming responses, function calling, tool execution, and context persistence in Next.js 15.

#AI Engineering#Gemini 2.0#Next.js 15#TypeScript

2026-06-1512 min read

Microservices vs Monolith in 2026: The Complete Architectural Framework

The monolith vs microservices debate isn't black and white. Here is a practical framework for deciding which architecture fits your software scale — with cost and SLA analysis.

#Architecture#System Design#Microservices

Read Full Article

Spring Boot Performance Tuning: From 200ms to 12ms High-Concurrency Throughput

Backend

6.2k views

2026-05-2012 min read

Spring Boot Performance Tuning: From 200ms to 12ms High-Concurrency Throughput

A step-by-step guide to optimizing Spring Boot application performance — covering HikariCP connection pooling, Redis caching, JVM GC tuning, and Virtual Threads.

#Java 21#Spring Boot#HikariCP

Read Full Article

Docker & Kubernetes in Production: 10 Costly Mistakes & Zero-Downtime Fixes

DevOps

3.9k views

2026-04-1013 min read

Docker & Kubernetes in Production: 10 Costly Mistakes & Zero-Downtime Fixes

From running containers as root to missing health checks, these are the most common DevOps mistakes in production — and how to fix each one with Dockerfile blueprints.

#Docker#Kubernetes#DevOps

Read Full Article

Technical Newsletter

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LET'S WORKTGETHER

Or email me at soumikmukherjeekolkata@gmail.com

BUILD WEBSITES& APPS THATGROW YOUR BUSINESS

I'm Soumik — a full-stack software engineer delivering COMPLETE DIGITAL SOLUTIONS for startups & growing businesses. From FAST WEBSITES & MOBILE APPS to SECURE CLOUD DEPLOYMENT, I handle every layer from scratch so you can focus on running your business effortlessly.

EVERYTHING YOU NEED,FROM ONE DEVELOPER

Custom Business Website Development

Web Application & SaaS MVP Development

Cross-Platform Mobile App Development

Desktop Application Development

UI/UX Design

Domain & SSL Protection

SEO & GEO Optimization

Digital Marketing & Growth

Agentic AI Chatbots & Automation

I'VEBUILTFOR CLIENTS

DIETOMOUMI — Dietation Doctor Platform

Dugguz Delight — Multicuisine Restaurant Platform

Super Gearz — Online Sports E-Commerce Platform

FinTech Payment Processing Platform

Healthcare Telemedicine Platform

DIETOMOUMI — Dietation Doctor Platform

Dugguz Delight — Multicuisine Restaurant Platform

Super Gearz — Online Sports E-Commerce Platform

FinTech Payment Processing Platform

Healthcare Telemedicine Platform

MY PROVEN PROCESS

Discover

Design

Develop

Deploy

Support

I TAKE PRIDE INMY ACCOMPLISHMENTS

From Idea to Live Product — End to End

15+ Technologies, One Trusted Developer

50+ APIs Powering Live Businesses

DON'T JUST TAKEMY WORD FOR IT.

COMMON QUESTIONS

LATEST ARTICLES & TECHNICAL GUIDES

Engineering Autonomous Agentic AI Assistants with Next.js 15 & Gemini 2.0

Microservices vs Monolith in 2026: The Complete Architectural Framework

Spring Boot Performance Tuning: From 200ms to 12ms High-Concurrency Throughput

Docker & Kubernetes in Production: 10 Costly Mistakes & Zero-Downtime Fixes

Stay Ahead in Software Engineering

LET'S WORKTGETHER

BUILD WEBSITES
& APPS THAT
GROW YOUR BUSINESS

EVERYTHING YOU NEED,
FROM ONE DEVELOPER

I'VE
BUILT
FOR CLIENTS

I TAKE PRIDE IN
MY ACCOMPLISHMENTS

DON'T JUST TAKE
MY WORD FOR IT.

LATEST ARTICLES &
TECHNICAL GUIDES