Arbaz Mateen
Lead Developer · Mobile · Web · Backend

I build reliable products across every layer of delivery.

I’m a lead developer with 11+ years of experience across Flutter, React.js, Node.js and enterprise platforms. I turn complex requirements into maintainable products and guide teams from architecture through deployment.

Explore my work Let’s talk
Available forFreelance · Contract · Full-time work
Core technologies
  • Flutter
  • React.js
  • Node.js
  • PostgreSQL
  • MySQL
  • Duck DB
  • SQLite
  • Redis
  • RabbitMQ
  • Docker
  • AWS
  • CI/CD
  • EDGE Computing
  • LoRaWAN
  • Socket.io

Selected work

Complete systems, not isolated features.

Four areas of work show the range of my delivery: enterprise systems, a multi-product mobile portfolio, cross-platform delivery leadership, and production deployment on AWS.

01 · Enterprise platform delivery

Pakistan Medical Commission

A tablet-first examination platform comprising a Flutter exam application, Node.js backend APIs, and a React.js administration portal for examiners.

React.jsFlutterNode.jsSocket.ioPostgreSQLRedisDockerRabbitMQ
  • Built the Flutter exam application specifically for tablet-based examination workflows.
  • Developed Node.js APIs and a React.js administration portal for examiner operations.
  • Implemented live student activity monitoring in the tablet application with Socket.io.
  • Used PostgreSQL, Redis, RabbitMQ, and Docker for persistent data, caching, message processing, and containerized deployment.

02 · Product portfolio

Knarkz Solutions

Cross-platform applications and supporting services across healthcare, HR, jobs, compliance, property surveys, education, retail, and pet training.

FlutterReact.jsNode.jsFirebasePaymentsMaps
  • Built Android and iOS applications, React.js features, and Node.js APIs.
  • Integrated Stripe, Rapyd, GoCardless, NMI Payment Gateway, Twilio, SendGrid, Firebase, AWS and Google Maps.
  • Delivered nine highlighted applications across two tenures.

03 · Delivery leadership

Xufire Technologies

Enterprise web and mobile delivery with ownership across reusable services, interfaces, quality practices, deployment workflows, and team coordination.

React.jsFlutterUnit testsCode reviewCI/CDLinux
  • Led reusable service and user-interface development.
  • Supported unit testing, code reviews, estimation, and coordination.
  • Established CI/CD workflows from Git to Linux servers.

04 · Cloud infrastructure

AWS Production Deployments

Deploy production applications to AWS using managed compute, database, storage, networking, security, and certificate services.

Amazon EC2PostgreSQLAmazon S3Route 53ALBAWS WAFACM
  • Provision and configure Amazon EC2 instances and PostgreSQL databases for application workloads.
  • Manage Amazon S3 object storage and map application domains through Route 53.
  • Configure Application Load Balancers to distribute traffic across application services.
  • Secure public applications with AWS WAF and ACM-managed TLS certificates.

Business solutions

Specific delivery problems I solve.

Each area is grounded in responsibilities, technologies, and products demonstrated throughout my professional experience.

01

Cross-platform mobile products

The need: One dependable product experience across Android and iOS, supported by maintainable services.

What I deliver
  • Flutter applications for Android and iOS
  • Reusable Flutter components and responsive layouts for phones and tablets
  • Offline and online workflows, notifications, maps, and payments

02

Web interfaces and backend APIs

The need: Responsive client experiences connected to reliable business logic and external services.

What I deliver
  • React.js client-facing and enterprise interfaces
  • Scalable Node.js services and real-time Socket.io communication
  • REST API development and third-party service integrations

03

Enterprise modernization

The need: Complex systems that remain componentized, interoperable, and practical to operate.

What I deliver
  • Requirement analysis and interface definition
  • SOAP-to-REST middleware and reusable services
  • PostgreSQL, Redis, Docker, and infrastructure-aware delivery

04

Technical leadership and operations

The need: Teams that can estimate clearly, ship reliably, and support what they build.

What I deliver
  • Task estimation, planning, documentation, and guidance
  • Code review, unit testing, and Git workflows
  • CI/CD, Linux deployments, and delivery coordination

Experience and education

More than a decade of shipping software.

A career that began in Android development and expanded into cross-platform mobile, frontend, backend, architecture, DevOps, and delivery leadership.

  1. Lead Developer · Knarkz Solutions

    Flutter mobile applications, React.js interfaces, Node.js APIs, third-party integrations, documentation, Agile planning, and delivery support.

  2. Lead Developer and Implementation Consultant · Pakistan Medical Commission

    Six-month enterprise contract covering requirements, estimation, technical guidance, Laravel, Node.js, Flutter, PostgreSQL, Redis, and Docker.

  3. Lead Developer and Project Manager · Xufire Technologies

    Enterprise React.js and Flutter delivery, reusable services, unit tests, code reviews, CI/CD, and cross-team coordination.

  4. Lead Developer · Knarkz Solutions

    Flutter applications, Node.js APIs, third-party services, and middleware that converted SOAP APIs to REST APIs.

  5. Senior Software Engineer · Softagics Pvt. Ltd.

    Mobile product delivery across Flutter and Kotlin Android development.

  6. Software Engineer · Paknet

    Java Android application development and support.

  7. IT Freelancer · Independent

    Freelance Java Android development for client applications.

Toolkit

Capabilities across the product stack.

Mobile
Flutter, Dart, Kotlin, Java, Android, iOS, Swift
Web and backend
React.js, Node.js, Laravel, PHP, JavaScript, Python, AJAX, Socket.io
Data
PostgreSQL, MySQL, MongoDB, Firestore, SQLite, SQL Server, AWS RDS Aurora
APIs and services
REST, SOAP, GraphQL, Stripe, GoCardless, Firebase, Twilio, SendGrid, Google Maps
Infrastructure
Amazon EC2, Amazon S3, Route 53, Application Load Balancer, AWS WAF, AWS Certificate Manager, Docker, Redis, RabbitMQ, Bash, Linux, NPM
Delivery practice
Git, CI/CD, unit tests, code review, Agile planning, Jira, Trello, Zoho, ClickUp

About

Hands-on engineering with delivery ownership.

I’m Arbaz Mateen, a lead developer based in Multan, Pakistan. My work spans mobile, frontend, backend, integrations, data, and deployment. I’m most effective where a product needs both strong implementation and clear technical leadership.

I care about practical architecture, maintainable code, reliable integrations, clear documentation, and teams that understand what they are building and why. Across enterprise contracts and product portfolios, I’ve combined hands-on development with estimation, review, planning, and support.

Based in
Multan, Pakistan
Core focus
Mobile, web, backend, and enterprise delivery
Leadership
Implementation, project management, estimation, and technical guidance
Working style
Analytical, detail-oriented, collaborative, and documentation-led

Contact

Have a product or an engineering role?

Let’s discuss the system, the delivery challenge, and what a reliable implementation should look like.

arbazmateen@gmail.com +92 314 6301751 LinkedIn