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NatnaeAssefa/README.md

Hi there 👋 My name is Natnael Assefa

About me

I’m a backend-heavy Full Stack Developer with 4+ years of experience building scalable, production-ready systems.
My work focuses on backend architecture, payment systems, subscriptions, and complex business logic, with solid frontend experience to deliver complete solutions.

I enjoy turning real-world problems into clean, maintainable systems — especially where payments, analytics, affiliates, and scalability intersect.

I’ve worked on platforms handling subscriptions, Stripe billing, affiliate payouts, data visualization, and system integrations, always with a strong emphasis on correctness and long-term maintainability.

My top open source projects

🧩 Subscription & Billing Systems

Backend systems handling:

  • Stripe subscriptions & proration
  • Graduated and tier-based pricing
  • Affiliate & commission logic
  • Secure payout workflows

Tech: Node.js · NestJS · Sequelize · PostgreSQL · Stripe

🗺️ Data Visualization Platform

A map-based data visualization platform processing wearable sensor data and rendering:

  • Polylines & markers using React Leaflet
  • Dynamic midpoint generation
  • Color-based air-quality transitions

Tech: React · React Leaflet · Node.js · PostgreSQL

🔗 Affiliate Payout System

A complete affiliate payout workflow including:

  • Minimum payout thresholds
  • PayPal & bank transfer options
  • Status-based notifications
  • Secure handling of financial data

Tech: Node.js · Express · Sequelize · PostgreSQL

Top projects I’ve contributed to

💳 Payment & Financial Infrastructure

  • Subscription lifecycle management
  • Manual & automated Stripe charging
  • Mid-cycle subscription adjustments
  • Retention & churn analytics

📊 Analytics & Reporting Systems

  • Monthly dynamic reporting
  • Retention & churn rate calculations
  • Business-driven metrics & insights

Tech Stack

Technologies

Node.js Java TypeScript JavaScript

Frameworks / Libraries

NestJS Express Spring Boot FastAPI Flask React Next.js

Databases

PostgreSQL MySQL

Tools & Platforms

Stripe Docker GitHub Actions

⚡ Fun fact

I enjoy backend problems that look simple… until you hit billing edge cases 😄

Popular repositories Loading

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    This mini system was designed to help a local clinic in Gonder to provide a better service for it's customers, the clinic's major problem was every time a customer comes they would have to pay for …

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  2. ethiopian_counterfiet_currency_detection ethiopian_counterfiet_currency_detection Public

    This final year project focuses on detecting counterfeit currency using deep learning–based image classification. A convolutional neural network model based on VGG16 is trained to classify images o…

    Jupyter Notebook

  3. Smart_anti_teft_system Smart_anti_teft_system Public

    a smart anti theft system that can be used for one door way room or small office this system uses a microcontroller and an ultrasonic sensor to sense if there is some one or object outthere if ther…

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  4. animated-mail animated-mail Public

    A closed mail, when hovered opens up and pulls out the letter, made using CSS and HTML.

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  5. Movie-Metro Movie-Metro Public

    Movie Metro is a single page application that allows users to search for any movie or show's ratings and details.

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  6. Nyeusi-Fest-Site Nyeusi-Fest-Site Public

    This is a demo concert website for a music festival called Nyeusi. It has a home page that highlights: A header with a logo and navigation bar. An introduction page. Schedule section. Featured acts…

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