Available for freelance & consulting

Amarnath T S R

Tech Lead @ ROSHN

Building Digital Solutions • Helping Businesses Scale Through Technology

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Available for freelance projects & consulting — open to new projects

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About

Twelve years of building what businesses need next.

Engineer first, operator second. I architect the systems and ship the products.

Portrait of Amarnath T S R, Tech Lead & Full-Stack Architect
AmarnathTech Lead & Full-Stack Architect

Senior full-stack engineer and solution architect with 12+ years designing and delivering large, highly customised web and mobile platforms — from e-commerce and content management to enterprise real-estate systems. Today I'm Tech Lead at ROSHN Group in Saudi Arabia, on the Home Acquisition team: I built the end-to-end unit reservation flow including payment gateway integration, wired in SignIt digital signing, Nafath identity verification and ForgeRock authentication, and own the microservices that keep CRM and CMS data in sync.

Before ROSHN I led Martech engineering at CARSOME in Malaysia and lending platform engineering for Wells Fargo in the US. I work across AWS (EC2, Amplify, S3, CloudFront), Google Cloud (Cloud Run, Pub/Sub, Cloud SQL) and Cloudflare Workers, with hands-on CI/CD automation, and I've delivered as both Module Lead and Scrum Master.

Currently

Tech Lead @ ROSHN

Focus

Home Acquisition • Payments • Identity

Languages

English, Tamil

Worked across

🇸🇦 🇲🇾 🇮🇳 🇺🇸

Reach me

hello@helloamarnath.com

Tools and tech I ship with

React
Next.js
Node.js
Nest.js
TypeScript
React Native
GraphQL
Socket.IO
AWS
Google Cloud
Cloudflare Workers
Kafka
MongoDB
PostgreSQL
Prisma
Redis
Docker
WordPress
Tailwind
Firebase
Experience

A timeline of building & shipping

From first lines of code in 2011 to leading Home Acquisition at ROSHN today.

  1. ROSHN Group (روشن)

    Saudi Arabia · Remote

    Full-time Dec 2023 – Present · 2 yrs 9 mos

    Tech Lead — Home Acquisition

    Feb 2025 – Present

    Key contributor on the Home Acquisition frontend team. Built the end-to-end unit reservation flow including payment gateway integration, and integrated SignIt digital signing, Nafath identity verification and ForgeRock authentication. Own multiple microservices that synchronise CRM data into the CMS, and owned the book-appointment feature end to end — alongside frontend architecture, the in-house design system, performance and accessibility.

    Next.jsReact.jsTypeScriptForgeRockNafathPayment GatewaysMicroservicesDesign SystemsTeam Leadership

    Information Technology Consultant

    Dec 2023 – Feb 2025

    Built backend services and frontend dashboards for ROSHN's digital platforms, integrating with marketing and CRM systems. Optimised the reservation flow and enhanced the login and registration journeys before moving fully into the Home Acquisition platform.

    Nest.jsApollo GraphQLReactNode.jsAWS

  2. CARSOME

    via MSP Hitect Services Pvt Ltd

    Malaysia · Remote

    Full-time Apr 2022 – Nov 2023 · 1 yr 8 mos

    Module Lead — Martech Engineering

    Apr 2022 – Nov 2023

    Designed and built scalable Martech and customer-engagement platforms connecting digital channels, CRM, customer data and marketing automation systems. Built customer journey and event tracking across web and mobile with API integrations to CRM, CDP, analytics, WhatsApp, email and SMS platforms. Implemented segmentation, personalisation and automated campaign journeys, with event-driven data pipelines powering Customer 360, attribution and funnel analytics — on reusable React and Node.js components that improved lead conversion and campaign effectiveness.

    Node.jsNest.jsReactReduxKafkaCDPMarketing AutomationServerlessWordPress

  3. Wells Fargo

    via Persistent Systems

    USA · Remote

    Full-time Jun 2021 – Mar 2022 · 10 mos

    Engineering Lead — Lending Platform Engineering

    Jun 2021 – Mar 2022

    Developed a digital lending platform supporting end-to-end loan origination and customer journeys, with scalable React and Node.js applications and APIs. Built REST integrations with internal and third-party systems for customer data, eligibility, credit assessment, decisioning and loan processing, and implemented the business workflows and validation rules spanning application, underwriting, approval, documentation and servicing — to enterprise banking standards for security, compliance, logging and auditability. Led a mission-critical internal web application team, cutting developer onboarding time by 60% and reducing defects by up to 30% by writing test cases for every React component.

    ReactReduxNode.jsREST APIsLoan OriginationTestingLeadership

  4. Upwork (Freelance)

    Remote

    Freelance Sep 2020 – Jun 2021 · 10 mos

    Full Stack Developer

    Sep 2020 – Jun 2021

    Requirements gathering, validation and peer code reviews for a high-profile external web application, taking it from MVP through to product–market fit.

    ReactREST APIsChart.jsCode Review

  5. Geeks Invention Pvt Ltd

    India

    Full-time Oct 2020 – Mar 2021 · 6 mos

    Software Engineer

    Oct 2020 – Mar 2021

    Automated CI/CD for a high-profile single-page application, cutting manual deployment effort by 97%, and designed the MongoDB schemas behind it.

    MERNMongoDBCI/CDREST APIs

  6. Abservetech Pvt Ltd

    Madurai, India

    Full-time Jan 2019 – Sep 2020 · 1 yr 9 mos

    Full Stack Developer

    Jan 2019 – Sep 2020

    Automated CI/CD for a customer portal, making deployments 3× faster, and migrated environments to the cloud — cutting administration overhead by 95%.

    MongoDBExpressReactNode.jsCI/CDCloud Migration

  7. Upwork (Freelance)

    Remote

    Freelance Jun 2013 – Sep 2019 · 6 yrs 4 mos

    Freelancer

    Jun 2013 – Sep 2019

    Long-running freelance practice — full-stack development and API design for client web applications across the stack.

    Node.jsReactExpressREST APIs

  8. Enova Software and Hardware

    India

    Full-time Nov 2011 – Jun 2013 · 1 yr 8 mos

    System Analyst

    Nov 2011 – Jun 2013

    First professional role — Drupal and WordPress development, building and maintaining a college portal.

    DrupalWordPressPHPHTMLJavaScript
Case Studies

Work that moved the needle

Three projects that compressed costs, unlocked scale, and reset the baseline.

Case 01

ROSHN Home Acquisition

ROSHN Group, Saudi Arabia

Problem

Buying a home had to happen end to end online — reserving a unit, paying, verifying identity and signing — with CRM and CMS staying in sync behind it.

Solution

Built the end-to-end unit reservation flow including payment gateway integration, and integrated SignIt digital signing, Nafath identity verification and ForgeRock authentication. Own the microservices that synchronise CRM data into the CMS, plus the book-appointment feature end to end.

Impact

  • Reservation, payment, KYC and signing in one journey
  • CRM ↔ CMS kept in sync at enterprise scale
  • Optimised reservation, login and registration flows
Next.jsReactTypeScriptForgeRockNafathMicroservices
Case 02

CARSOME Martech Suite

CARSOME, Malaysia

Problem

Marketing team relied heavily on expensive third-party tools (AppsFlyer, etc.) with limited customization.

Solution

Architected in-house Martech tools using Node.js, Nest.js, React & Kafka — built UTM generators, QR systems, and a multi-vendor communication hub (MessageBird, Twilio, Mailchimp).

Impact

  • Reduced third-party costs significantly
  • Streamlined campaign workflows
  • 6 WordPress properties unified
Node.jsNest.jsReactKafkaServerlessWordPress
Case 03

Wells Fargo Digital Lending

Wells Fargo, USA (via Persistent Systems)

Problem

Loan origination spanned application, underwriting, approval, documentation and servicing — each with its own systems, rules and compliance obligations.

Solution

Built a digital lending platform on React and Node.js covering the end-to-end customer journey, with REST integrations for customer data, eligibility, credit assessment and decisioning, and the business workflows and validation rules across every stage — to enterprise banking standards for security, compliance, logging and auditability.

Impact

  • 60% faster developer onboarding on the internal platform team
  • Up to 30% fewer defects via per-component React test coverage
  • Improved performance and reliability across critical lending journeys
ReactReduxNode.jsREST APIsLoan OriginationTesting
Project

Built end to end, by one engineer

A production multi-tenant SaaS platform — architecture, API, four web portals, a shipped mobile app, and the delivery chain underneath it.

SalesTub CRM Multi-Tenant SaaS Platform

Solo Architect & Full-Stack Engineer · NestJS · Next.js · React Native · PostgreSQL · GCP

salestub.com
Lines of TypeScript
~507K
REST endpoints
696
Prisma models
113
Monorepo projects
9
  • Architected and shipped a production multi-tenant CRM SaaS for Indian SMBs as sole engineer — a 9-project TypeScript monorepo (~507K LOC) spanning a NestJS REST API (696 endpoints, 113 Prisma models), four Next.js web portals, and a React Native (Expo) mobile app live on the App Store.
  • Designed strict tenant isolation and a deny-by-default RBAC layer (global JWT guard + granular permission guards) across every route, eliminating cross-org data exposure in a shared-database architecture.
  • Built an end-to-end marketplace lead-ingestion pipeline — Cloudflare Email Routing → Workers (Claude API extraction) → Cloud Run → Pub/Sub → API — that parses unstructured IndiaMART/TradeIndia emails into structured leads; diagnosed and remediated a placeholder-identity defect that had silently dropped 2,224 leads (25% of volume), then replayed 2,004 of them.
  • Implemented invoice-first subscription billing with Razorpay, Stripe and Cashfree — GST-compliant (Rule 46) invoicing, multi-year terms, coupon-to-commission netting, and an idempotent activation path hardened against webhook/verify race conditions.
  • Shipped a visual workflow-automation engine (React Flow canvas → Bull/Redis job execution) plus WhatsApp Business campaigns, FCM push, real-time WebSocket fan-out over Redis pub/sub, and reference-counted R2 file storage with per-org quotas.
  • Owned the full delivery chain: Prisma migrations on Neon Postgres, Cloud Build → Cloud Run CI/CD, Vercel front-ends, Sentry monitoring, GCP cost optimization, and a 6-round App Store review remediation ending in approval.
NestJSNext.jsReact NativeExpoTypeScriptPostgreSQLPrismaNeonGoogle Cloud RunPub/SubCloudflare WorkersR2RedisBullReact FlowRazorpayStripeCashfreeWhatsApp Business APIFCMWebSocketsVercelSentry
Services

What I can do for you

End-to-end product engineering and IT consulting — across web, mobile, cloud and marketing.

Web Development

Production-grade Next.js & React apps with Nest.js backends.

Mobile Apps

Cross-platform iOS & Android with React Native.

Cloud & Serverless

AWS Lambda, serverless architectures, infra design.

SaaS Development

End-to-end SaaS products from MVP to scale.

WordPress Design

Custom themes, plugins, and headless WordPress.

Digital Marketing

Martech automation and campaign tooling.

IT Consulting

Tech strategy, architecture reviews, hiring.

Software Testing

Automated QA pipelines and integration tests.

Cloud Management

DevOps, CI/CD, monitoring, cost optimization.

Android & iOS

Native and React Native mobile apps.

How I work

A simple, transparent process

Five steps from idea to live product — with weekly demos so you stay in the loop.

  1. Step 01

    Discover

    Understand the business, audience, and constraints.

  2. Step 02

    Design

    Architecture diagrams, wireframes, and tech selection.

  3. Step 03

    Develop

    Iterative builds with weekly demos.

  4. Step 04

    Deploy

    CI/CD with staged rollouts and observability.

  5. Step 05

    Support

    Ongoing tuning, monitoring, and feature releases.

Skills

The stack I work in daily

The tools, frameworks, and disciplines I bring to every project.

Frontend

React.jsNext.jsReact NativeTypeScriptJavaScriptRedux.jsTailwindChart.jsHTML5CSS3

Backend

Node.jsNest.jsExpress.jsGraphQLSocket.IOREST APIsServerlessKafka

Data

MongoDBPostgreSQLFirebaseTypeORMSequelize

Cloud & Tools

AWSGoogle CloudCloudflare WorkersDockerForgeRockPuppeteerGitCI/CDVercelWordPress

Leadership

Module LeadScrum MasterTeam LeadershipMentoringArchitecture ReviewsJira
Achievements

Highlights worth remembering

Cherry-picked wins from 12+ years of consulting, engineering, and building.

Tech Lead at ROSHN

Built the end-to-end unit reservation flow — payments, Nafath identity verification and SignIt digital signing — for Saudi Arabia's flagship real-estate group.

60% faster developer onboarding

Led a mission-critical internal web application team at Wells Fargo and cut onboarding time by 60%.

Up to 30% fewer defects

Wrote test cases for every React component across the Wells Fargo lending platform.

97% less manual deployment

Automated CI/CD for a high-profile single-page application at Geeks Invention.

3× faster deployments, 95% less admin

Automated CI/CD and migrated environments to the cloud at Abservetech.

Cost Optimization at CARSOME

Reduced reliance on AppsFlyer & 3rd-party platforms via in-house Martech tooling.

46 LinkedIn Recommendations

Trusted by peers across multiple continents, with a 15K+ following.

Education

Where it started

Finance & computer applications — the bridge between business and code.

KV Institute of Management and Information Studies

MBA, Finance

2009 – 2011

Grade: ADebate, Personality Development

Madurai Kamaraj University

B.Com (Computer Application)

2007 – 2009

Grade: ANational Social Service
Certifications

Continually leveling up

Investments in fundamentals — Node.js, the MERN stack, and beyond.

Udemy

The Complete Node.js Developer Course (3rd Edition)

Jun 2020

UC-c4973982-6e99-41a9-90ba-a91a16d01d96

Udemy

MERN Stack Front To Back: Full Stack React, Redux & Node.js

Nov 2018

UC-DAHAWKFZ

Languages

Talking to teams in their language

English

Professional

Tamil

Native

Blog

Things I think out loud about

Short notes from the trenches — backend patterns, SaaS lessons, and tools that ship.

Securing JSON Responses in NestJS

How @Exclude() prevents data leaks.

4 min · 2024

HTTP Methods in NestJS — A Practical Guide

When to GET, POST, PATCH and PUT.

6 min · 2024
Read all posts
Testimonials

What teammates say

Words from engineers and leaders I've worked alongside.

“Amar is an exceptional technical leader in front-end development. His deep expertise combined with his ability to guide and mentor a team makes him a strong leader.”

Zakaria HarraneSoftware Engineer at ROSHN
FAQ

Quick answers

The questions I'm asked most often.

Web & mobile development, SaaS engineering, cloud architecture, IT consulting, and Martech tooling — from end-to-end customer journeys to the microservices behind them.

Newsletter

Build with me — monthly

One thoughtful email per month on shipping scalable SaaS, Martech tooling, and team building.

No spam. Unsubscribe in one click.

Contact

Let's build something good

Tell me about your project, your timeline, and what success looks like.

Reach me directly

WhatsApp is fastest. I usually respond inside 24 hours.

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