Digital Portfolio

Arbaz Mateen

Lead developer with 11+ years of experience building Flutter mobile apps, React.js web interfaces, Node.js backend services, and enterprise software systems. I specialize in turning complex product requirements into reliable, scalable delivery across mobile, web, API, and DevOps layers.

Flutter React.js Node.js Laravel Docker Redis CI/CD PostgreSQL MySQL
11+ Years across mobile, web, and backend engineering
4+ Primary domains: Flutter, React.js, Node.js, enterprise systems
9 Highlighted applications shipped in the Knarkz portfolio
Lead Experience across implementation, project management, and technical guidance

Professional Profile

A commercially astute professional with 11+ years of experience across Android, Flutter, React.js, Node.js, Laravel, and enterprise delivery. Analytical and detail-oriented, with a strong focus on bringing teams together, keeping execution on time, and building systems that are practical, maintainable, and easy to operate.

Expertise

Mobile Product Delivery Cross-platform Flutter apps for Android and iOS, plus deep experience with native Android and Kotlin-based work.
Web and Frontend React.js interfaces for enterprise and client-facing applications, with reusable UI and practical component design.
Backend and APIs Node.js services, REST and SOAP integration, third-party APIs, and middleware that improves interoperability and performance.
Delivery and Operations Agile planning, task estimation, Git workflows, CI/CD, Docker, Redis, and cross-functional coordination across teams.

Professional Experience

Lead Developer

Knarkz Solutions, December 2022 - Present

Knarkz Solutions Pvt. Ltd | Mobile apps, backend APIs, and third-party integration

  • Senior Flutter developer building cross-platform Android and iOS applications.
  • React.js frontend development for web interfaces and client-facing features.
  • Node.js backend developer creating APIs and integrating third-party services such as Stripe, GoCardless, Firebase, Twilio, SendGrid, and Google Maps.
  • Selected applications delivered: Pantheon Health, Note It Nip It, Job Link, Comply IX, Comply mForm, DPO Property, ADIT Driving School, Khans Halal Meat, and Teach My Pooch.
  • Supported delivery work that included clear development documentation, Agile planning, Trello/Zoho coordination, Git version control, and practical backend maintenance.

Lead Developer / Implementation Consultant

PMC, April 2022 - October 2022

Pakistan Medical Commission | 6-month contract

  • Analyzed system requirements, identified program interactions, and defined appropriate interfaces.
  • Estimated assigned work, led delivery tasks, and provided technical guidance across the team.
  • Built an enterprise-scale, highly componentized solution spanning Laravel web, Node.js backend services, Flutter mobile, and PostgreSQL.
  • Implemented Redis caching for improved performance and dockerized both the web and Node applications.

Lead Developer / Project Manager

Xufire Technologies, January 2021 - April 2022

Enterprise web and mobile delivery

  • Led development of reusable services, user interfaces, unit tests, and code reviews.
  • Built enterprise web and mobile applications using React.js and Flutter.
  • Set up CI/CD workflows from Git to Linux servers and coordinated delivery across tasks and teams.

Lead Developer

Knarkz Solutions, March 2018 - December 2020

Mobile apps, backend APIs, and third-party integration

  • Built cross-platform Android and iOS applications using Flutter.
  • Developed Node.js backend APIs and integrated services such as Stripe, GoCardless, Firebase, Twilio, SendGrid, and Google Maps.
  • Built middleware for converting SOAP APIs to REST APIs for improved performance.
  • Delivered applications including Pantheon Health, Note It Nip It, Job Link, Comply IX, Comply mForm, DPO Property, ADIT Driving School, Khans Halal Meat, and Teach My Pooch.

Senior Software Engineer

Softagics Pvt. Ltd., December 2016 - September 2017

Mobile engineering

  • Senior Flutter developer and Kotlin Android developer contributing to mobile product delivery.

Software Engineer

Paknet, October 2015 - September 2016

Android development

  • Java Android developer focused on mobile application development and support.

IT Freelancer

February 2011 - September 2015

Independent mobile development work

  • Java Android developer delivering freelance mobile development work.

Selected Delivery Highlights

Pantheon Health Gym application for clients and trainers.
Note It Nip It HR application for capturing bullying and harassment incidents.
Job Link Location-based job search application running in the background.
Comply IX and mForm Tax-focused applications for secure forms and document submission workflows.
DPO Property Survey app for land and building records with offline and online support.
Teach My Pooch Pet dog training application for owners and trainers.