Available for freelance projects

Node.js development, API integrations & payment systems that just work.

I'm Reza, developer at DevGenius. I build robust Node.js backends and Flutter apps, integrate third-party APIs and payment gateways, and configure headless CMS platforms like Strapi and Parse Server.

Start a ProjectView Fiverr Gigs
Node.jsNext.jsFlutterExpressREST & WebhooksStripe / PayPalStrapi CMSParse ServerQuickBooks Online APIMongoDB / PostgreSQL
What I offer

Services

End-to-end backend development, focused on reliability, clean integrations, and maintainable code.

⚙️

Node.js Development

Custom backend applications, REST/GraphQL APIs, and microservices built on Node.js.

  • Express / NestJS applications
  • Database design & ORM setup
  • Authentication & authorization
  • Performance optimization
🔗

API Integration

Connecting your app to the third-party services it depends on, cleanly and reliably.

  • Third-party & internal API integration
  • Webhooks & event-driven flows
  • API design & documentation
  • Rate limiting & error handling
💳

Payment Implementation

Secure payment processing added to your Node.js application.

  • Stripe, PayPal & other gateways
  • Subscriptions & recurring billing
  • Checkout flows & webhooks
  • PCI-conscious best practices
🧩

Strapi CMS Development & Setup

Strapi installation, configuration, and custom development for content-driven and app-backend needs.

  • Strapi setup, plugins & custom APIs
  • Content modeling & roles/permissions
  • Custom controllers & endpoints
  • Deployment & hosting
🅿️

Parse Server Configuration

Parse Server setup and customization as a backend for your web or mobile app.

  • Parse Server installation & hosting
  • Cloud code & custom classes
  • Data migration & scaling
  • Dashboard & access control
📊

QuickBooks Online API Integration

Connect your app to QuickBooks Online for accounting, invoicing, and financial data sync.

  • QuickBooks Online API & OAuth2 setup
  • Invoice, customer & payment sync
  • Automated bookkeeping workflows
  • Custom reporting integrations
📱

Flutter App Development

Cross-platform mobile apps built with Flutter, backed by your Node.js or CMS APIs.

  • iOS & Android apps from one codebase
  • REST/GraphQL API integration
  • State management & UI implementation
  • App store deployment
Reza, developer at DevGenius
About

Reza — Full-Stack Developer

10+Years in JavaScript
Full-stackUI to backend
Data VizAdvanced graphs

I have over 10 years of experience in web application development, building everything from UI-rich, object-manipulation-heavy interfaces to advanced graphs and data visualizations. DevGenius is my freelance development practice, focused on Node.js backends, Flutter apps, API integrations, and payment implementations for growing products. I also help teams stand up and customize headless CMS platforms like Strapi and Parse Server.

I work directly with clients to scope, build, and ship — whether that's a new backend from scratch, a cross-platform mobile app, an interactive dashboard full of charts, a payment flow bolted onto an existing app, or a CMS configured to fit a specific content model.

Node.jsNext.jsFlutterStrapiParse ServerPayment GatewaysAPI IngegrationsQuickBooks API
On Fiverr

Fiverr Gigs

Book a service directly through DevGenius on Fiverr.

Secure API integration with Node.js

GIG

I will integrate any third-party API into your Node.js application securely and efficiently.

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Powerful React/Next.js App Development with Parse Server Backend

GIG

Build robust and scalable web applications using React or Next.js, integrated with a Parse Server backend.

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Custom Web Application using Next.js and Node.js

GIG

Develop a custom web application with Next.js for the frontend and Node.js, Express, Strapi or any other backend technology for the backend, tailored to your business needs.

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Cross platform Mobile App Development with Flutter

GIG

I will develop a cross-platform mobile application using Flutter, ensuring a seamless experience on both iOS and Android devices.

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Let's work together

Three ways to hire me

Pick whichever path works best for you — reach out directly, book me through Toptal, or hire me on Fiverr.

✉️

Direct Contact

Email me to discuss your project, timeline, and budget — no platform in between.

Contact Me

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Hire on Fiverr

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Get in touch

Let's build something

Tell me about your project — backend, API integration, payments, or CMS. Reach out directly, no forms in between.

✉️

Email

mr.hosainy@gmail.com

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WhatsApp

+93 744 031 452

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