MERN & React Native · SDE-2 · Bangalore

Arunraj MK — Full-Stack Engineer

Building scalable, high-performance web and mobile applications across fintech and healthcare — from API architecture to production-grade POS, SDKs, and enterprise platforms.

Get in Touch View Work

Production Apps

25%

API Perf. Gain

99.9%

Uptime

Futuristic developer workspace illustration

const stack = ['MERN', 'RN']
await deploy('fintech')

POS Platform

50+

Retail Outlets Served

React ✦Next.js ✦React Native ✦TypeScript ✦Node.js ✦Fastify ✦MongoDB ✦Redis ✦Zustand ✦Socket.IO ✦Docker ✦AWS ✦React ✦Next.js ✦React Native ✦TypeScript ✦Node.js ✦Fastify ✦MongoDB ✦Redis ✦Zustand ✦Socket.IO ✦Docker ✦AWS ✦

About

MERN & React Native engineer building production-grade systems

MERN Stack & React Native engineer with experience shipping production systems in fintech and healthcare. I focus on clean architecture, API design, and reliable delivery — from mobile and web apps to backends that scale.

Experience

Building products across fintech & healthcare

SDE-2 level full-stack engineer with a track record of shipping production systems at scale.

MERN Stack + Mobile App Developer (SDE-2)

Neokred Technologies

Bangalore, India

Jul 2024 – Apr 2026

SDE-2 role owning full-stack delivery across fintech web and mobile products.
Technical leadership, mentorship, and on-time release of multiple production systems.

MERN Stack + Mobile App Developer (SDE-1)

Medpick

Bangalore, India

May 2023 – Jul 2024

Built healthcare web, mobile, desktop, and enterprise applications end to end.
RESTful APIs, CI/CD, and cross-functional delivery aligned with product roadmaps.

Full Stack & React Native Training

Masai School

Bangalore, India

Jan 2022 – May 2023

Completed Full Stack Web Development and Mobile Application Development (React Native) programs.
Built foundation in MERN stack, system design, and production-ready application development.

Education

Mobile Application Development (React Native)

Masai School, Bangalore

2023

Full Stack Web Development Certification

Masai School, Bangalore

2023

B.E. — Mechatronics Engineering

Salem College of Engineering and Technology, Salem

2019

Company Projects

Production work at Neokred & Medpick

Fintech and healthcare systems shipped in production — scope, responsibilities, and outcomes.

Apos Billing

Neokred Technologies

Full-stack · Mobile & Web

Fintech · POSFeb 2026 – Apr 2026

End-to-end POS platform for retail billing — mobile app and web admin with real-time transactions and hardware integrations.

Responsibilities

Built scalable billing flows for retail outlets with efficient checkout and order processing.
Integrated Dspread-30/80 devices for card and payment hardware at the point of sale.
Implemented real-time billing, order sync, and device-level APIs for seamless transactions.
Designed admin dashboard for system monitoring, outlet control, and operational visibility.

Impact

POS system deployed across 50+ retail outlets.
Real-time processing reduced checkout friction for high-volume retail use.

Tech stack

React NativeMongoDBFastifyZustandTailwind CSSDspread SDK

Device Intelligence SDK

Neokred Technologies

Mobile · SDK Architecture

Fintech · SDKNov 2025 – Feb 2026

Custom device intelligence package and companion app for fraud detection, device fingerprinting, and risk-based transaction controls.

Responsibilities

Architected SDK for advanced device data collection and fraud signal aggregation.
Configured fingerprint rules to detect duplicates, emulators, and high-risk device patterns.
Integrated behavioral biometrics to analyze interaction patterns beyond static identity.
Enabled blocking of unrecognized devices and risk-based transaction restrictions via Socket.IO.

Impact

Strengthened fraud prevention for fintech onboarding and payment flows.
Unified device risk signals into a reusable SDK consumed across mobile products.

Tech stack

React NativeFingerprintJSDevice Info APIsSocket.IOZustandReact Query

Perkle

Neokred Technologies

Full-stack · Platform

Fintech · VouchersMay 2025 – Nov 2025

Voucher management and distribution platform supporting role-based access, bulk issuance, and high-volume redemption pipelines.

Responsibilities

Developed voucher lifecycle management with RBAC for admins, partners, and operators.
Implemented bulk voucher generation, distribution workflows, and redemption tracking.
Built background jobs with BullMQ and cron for scheduled campaigns and batch processing.
Optimized backend for high-volume voucher processing with Redis caching and queue workers.

Impact

Reliable bulk distribution for enterprise voucher programs at scale.
Containerized services with Docker for consistent staging and production deploys.

Tech stack

FastifyMongoDBRedisBullMQCron JobsZustandReact QueryTailwind CSSDocker

Blutic

Neokred Technologies

Full-stack · Web & Mobile

Fintech · ConsentJan 2025 – May 2025

Consent management platform for user data permissions, access control, and enterprise-grade privacy workflows on web and mobile.

Responsibilities

Built consent capture and revocation flows aligned with data-permission regulations.
Developed admin dashboards for policy management and audit-friendly data access logs.
Designed secure data storage patterns and access-control layers for enterprise clients.
Delivered shared architecture across React web and React Native mobile with consistent state.

Impact

Unified consent UX across channels for B2B privacy compliance use cases.
Scalable foundation reused for subsequent fintech product lines.

Tech stack

ReactReact NativeMongoDBZustandReact QueryTailwind CSSFramer Motion

ProfileX

Neokred Technologies

Full-stack · Automation

Fintech · Risk IntelligenceNov 2024 – Jan 2025

Risk intelligence automation platform for customer onboarding, fraud detection, and collections — reducing manual ops and blind spots.

Responsibilities

Automated risk scoring and decision workflows for onboarding and collections teams.
Built pipelines for fraud signal ingestion, rule evaluation, and case prioritization.
Integrated BullMQ workers and scheduled jobs for batch risk reviews and alerts.
Developed Next.js dashboards for analysts to act on intelligence in real time.

Impact

Faster, data-driven decisions across onboarding and collections.
Reduced operational blind spots in enterprise risk workflows.

Tech stack

Next.jsFastifyMongoDBRedisBullMQCron JobsZustandReact QueryTailwind CSSDocker

Empact

Neokred Technologies

Full-stack · Multi-tenant

Social Impact · DonationsJul 2024 – Nov 2024

Donation platform connecting corporates with NGOs — structured giving with separate experiences for admins, corporates, NGOs, and employees.

Responsibilities

Implemented role-based portals for Admin, Corporate, NGO, and Employee user types.
Built donation workflows, contribution tracking, and transparency reports for CSR programs.
Designed backend services for campaign management, allocations, and payout reconciliation.
Set up async processing with BullMQ for notifications, reports, and scheduled reconciliation.

Impact

Streamlined corporate–NGO contribution flows with clear audit trails.
Improved social-impact visibility for enterprise CSR initiatives.

Tech stack

Next.jsFastifyMongoDBRedisBullMQCron JobsZustandReact QueryTailwind CSSDocker

Vajra

Medpick

Full-stack · Web & Mobile

Healthcare · Asset ManagementMay 2023 – Sep 2023

Hospital equipment management system for asset tracking, maintenance scheduling, and compliance across web and mobile.

Responsibilities

Developed asset registry with lifecycle tracking, assignments, and maintenance calendars.
Built mobile workflows for field staff to scan, update, and schedule equipment service.
Created reporting views for downtime, compliance status, and maintenance backlog.
Integrated React Hook Form with validation for complex equipment data entry.

Impact

Improved operational efficiency by reducing equipment downtime.
Helped facilities meet maintenance and compliance standards.

Tech stack

ReactReact NativeMongoDBFastifyReduxReact QueryMaterial UIReact Hook Form

Asthra

Medpick

Full-stack · Web & Mobile

Healthcare · ProcurementAug 2023 – Dec 2023

Healthcare procurement platform streamlining medical supply and equipment purchasing for hospitals and facilities.

Responsibilities

Designed procurement request, approval, and vendor quote comparison workflows.
Built catalog and requisition features for medical supplies and capital equipment.
Optimized purchasing pipelines to cut manual coordination between departments.
Delivered responsive web and mobile interfaces for procurement and store teams.

Impact

Faster, more transparent medical supply purchasing for healthcare facilities.
Higher operational effectiveness in equipment and consumables procurement.

Tech stack

ReactReact NativeMongoDBFastifyReduxReact QueryMaterial UIReact Hook Form

Personal Projects

My own products & experiments

Side projects and builds I own end to end — open any card to visit the live site.

Wellness · Booking2026

Serene

Premium spa and wellness booking experience with services, team profiles, pricing, and contact flows.

Service catalog
Team section
Testimonials
Booking CTA

ReactTanStack Startshadcn/uiTailwind CSS

View project →

Education · Coaching2026

Vanguard Academy

Coaching institute site for school and competitive exam prep with courses, faculty, results, and admissions.

Course listings
Faculty profiles
Results showcase
Admissions form

ReactTanStack StartTailwind CSSVite

View project →

Jobs · Marketplace2026

Hireframe

Curated job board with category browsing, salary transparency, featured listings, and employer trust signals.

Job search
Category filters
Featured roles
Employer profiles

ReactTanStack StartFramer MotionTailwind CSS

View project →

HR · Dashboard2026

Pulse HR

Employee attendance dashboard with real-time stats, weekly trends, department breakdowns, and activity feeds.

Attendance overview
Charts & analytics
Sidebar navigation
Status badges

ReactTanStack StartRechartsshadcn/ui

View project →

SaaS · Landing Page2026

Launchly

Modern SaaS marketing site with pricing tiers, feature highlights, testimonials, and conversion-focused CTAs.

Hero & social proof
Pricing tables
FAQ accordion
Responsive layout

ReactTanStack StartTailwind CSSVite

View project →

Restaurant · Fine Dining2026

Maison

Elegant restaurant website with seasonal menu, reservation flow, gallery, and immersive hero photography.

Menu showcase
Table reservations
Image gallery
Dark mode

ReactTanStack StartFramer MotionTailwind CSS

View project →

Events · Wedding2026

Aanya & Rohan

Romantic wedding invitation site with countdown, schedule, story timeline, gallery lightbox, and RSVP form.

Event schedule
Photo gallery
RSVP form
Countdown timer

ReactTanStack StartFramer MotionTailwind CSS

View project →

E-commerce · Retail2026

Lin & Co

Premium lifestyle storefront with product grid, category navigation, trust badges, and polished product cards.

Product catalog
Category browsing
Hero promotions
Cart-ready UI

ReactTanStack StartMotionTailwind CSS

View project →

Core competencies

What I bring to product teams

Full-stack engineering across web, mobile, APIs, and cloud — from architecture to production delivery.

Full Stack Development

MERN stack web apps with React, Next.js, Node.js, and MongoDB at scale.

React Native Mobile

Cross-platform mobile apps with SDK integration and device-level features.

System Architecture

Scalable system design, microservices, and API architecture for enterprise products.

API Design & Integration

RESTful APIs, real-time systems with Socket.IO, and third-party SDK integrations.

Performance Optimization

Up to 25% API response improvements and 99.9% production uptime.

Admin Dashboards

Role-based dashboards for monitoring, control, and operational visibility.

Technical Leadership

Team mentoring, code standards, SDLC processes, and on-time project delivery.

Cloud & DevOps

Docker, Jenkins, AWS, Vercel, and CI/CD pipelines for reliable deployments.

Get in touch

Let's Build Something Impactful Together

Interested in collaborating on web or mobile products? Reach out with your project details — I typically respond within 24 hours.

arunrajshanker6@gmail.com