Nii Darku

Portfolio

Production Systems
I've Built

Not demos or side projects—these are real systems handling real transactions, real users, and real business operations in production environments.

BusyOs POS System

BusyParade

2024 – Present

A complete point-of-sale system built from scratch for retail operations. Handles real transactions, real inventory, and real business logic across multiple store locations.

Designed and architected the entire system from database schema to React frontend. Built to handle high-volume retail operations with full transactional integrity, real-time inventory tracking, and comprehensive reporting.

Full transaction workflow

Multi-location support

Real-time inventory sync

Key Features

  • ●Transaction processing with discounts, refunds, and partial payments
  • ●Real-time inventory tracking with low-stock alerts
  • ●Role-based access control for staff and managers
  • ●Daily, weekly, and monthly sales reporting
  • ●Customer loyalty and credit tracking
Node.jsPostgreSQLReactRedisExpressTypeScript

Real-Time Trading Notifications

Skippa Trading LLC

2022 – 2026

High-performance notification infrastructure delivering trade alerts with optimized speed across multiple channels.

Built the backend services powering Skippa's real-time trade alert system. Optimized for speed and reliability, because in trading, every millisecond matters and downtime costs real money.

Real-time delivery

Multi-channel notifications

Optimized performance

Key Features

  • ●Multi-channel delivery (Discord, OneSignal, WebSocket)
  • ●Priority queue system for critical alerts
  • ●Redis caching for high-frequency data
  • ●Event-driven architecture for scalability
  • ●Comprehensive logging and monitoring
Node.jsRedisDiscord APIOneSignalWebSocketPostgreSQL

BlueSHIELD Insurance Platform

BlueSPACE Financial Cloud

2021 – 2022

Multi-tenant insurance management system with policy administration, claims processing, and regulatory compliance features.

Contributed to the frontend development of BlueSHIELD, a comprehensive insurance platform serving multiple insurance providers across Africa. Built interactive dashboards and data visualization components.

Multi-tenant architecture

Complex policy workflows

Regulatory compliance built-in

Key Features

  • ●Policy management and administration dashboards
  • ●Claims processing workflows with approval chains
  • ●Premium calculation and billing integration
  • ●Document management and digital signatures
  • ●Audit trails for regulatory compliance
Vue.jsJavaScriptREST APIsCSS3Chart.js

PPA Ghana Procurement Portal

BlueSPACE Financial Cloud

2021

Government procurement portal for the Public Procurement Authority of Ghana, enabling transparent and efficient public sector purchasing.

Contributed to frontend development of this government platform, building interfaces that help streamline the public procurement process and increase transparency in government spending.

Government-scale platform

Public transparency focus

Streamlined procurement

Key Features

  • ●Tender listing and search functionality
  • ●Vendor registration and management
  • ●Bid submission workflows
  • ●Contract tracking and reporting
  • ●Public access for transparency
Vue.jsJavaScriptREST APIsGovernment APIs

Want to See More Code?

Check out my GitHub for open-source contributions and personal projects.

View GitHub Profile

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I'm ready to bring this same level of ownership and quality to your team. Let's talk about your next project.

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