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"Simplicity is the ultimate sophistication."
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inkosii/README.md

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Hi, I'm Sinenhlahla

Java Developer | FNB Enablement Office of the CIO
Honours in Computer Science | University of Pretoria

I enjoy designing and building backend systems, enterprise applications, and data-driven solutions that address real-world problems.

This is where I document both sides of that work.


GitHub Stats

GitHub Stats

Top Languages


What I Build

Focus Area Tech Stack
Enterprise Backend Java, Spring Boot, REST APIs, Microservices, Database Design
Cloud & Infrastructure Docker, Kong API Gateway, Prometheus, Grafana, ELK Stack
Machine Learning NLP, Cross-lingual Embeddings, Time-Series Forecasting, Model Evaluation
Data Engineering Python, Pandas, NumPy, scikit-learn, Streamlit
Full-Stack Development HTML5, CSS3, JavaScript, Responsive Design

Expertise Depth

Area Technologies & Concepts Representative Projects
Java & Enterprise Development Java, Spring Boot, REST APIs, Enterprise Application Design Cloud-Sim Bank, Enterprise Microservices
Cloud & Infrastructure Docker, API Gateways, Monitoring & Logging, Distributed Systems Concepts Cloud-Sim Bank
Machine Learning & NLP FastText, Cross-Lingual Embeddings, Time-Series Forecasting, Model Evaluation Cross-Lingual Embeddings, Electricity Demand Forecasting
Data & Analytics Python, Pandas, Power BI, Streamlit, Statistical Analysis Demand Dashboard, Analytics Projects
Web Development HTML5, CSS3, JavaScript, Responsive Design SA Taxi Platform, Student Dashboard

Currently Learning

Working on strengthening my understanding of enterprise software architecture, distributed systems, observability practices, and modern Java development while applying these concepts in a banking technology environment.


Featured Projects

1. Cloud-Sim Bank: Enterprise Microservices Architecture

Java Kong Docker Prometheus PostgreSQL

Repository: youth_cloud_banking_system

A microservices-based banking platform developed to explore modern enterprise architecture patterns. The project demonstrates service-to-service communication, API gateway integration, centralized monitoring, logging, and independent service deployment within a distributed system.

System Architecture:

Cloud-Sim Bank Architecture

How It Works:

Client
  │
  ├─ Kong API Gateway (8000)
  │  - Request routing
  │  - Rate limiting
  │  - Authentication
  │
  ├─ Account Service (8081)
  │  - User management
  │  - Account operations
  │
  ├─ Transaction Service (8082)
  │  - Deposits/Withdrawals
  │  - Transfer logic
  │
  └─ PostgreSQL (5432)
     - Persistent storage
     - ER modeled schema

Observer Layer:
  • Prometheus (9090) → Metrics collection
  • Grafana (3000) → Dashboard visualization  
  • ELK Stack (9200, 5601) → Centralized logging

Component Breakdown:

Component Purpose Technology
API Gateway Routes requests, enforces policies Kong
Account Service Manages user accounts and operations Java Spring Boot
Transaction Service Processes banking transactions Java Spring Boot
Database Data persistence PostgreSQL
Metrics System observability Prometheus + Grafana
Logs Centralized log aggregation Elasticsearch, Logstash, Kibana

What's Actually Running:

Prometheus collecting metrics from all services:

Prometheus Targets

All services reporting metrics successfully

Grafana dashboards showing throughput, latency, and health:

Grafana Dashboard

Real-time metrics: request throughput, response latency, service health

Kibana making logs searchable across all services:

Kibana Logs Dashboard

Centralized logs for debugging and compliance

Why This Approach Matters:

When you separate concerns like this, each service can be developed, tested, and deployed independently. The API gateway handles cross-cutting concerns like authentication and rate limiting. Monitoring is built in from the start, not bolted on later. When something breaks, you have metrics and logs to understand what happened. This is how modern systems work at scale.


2. Cross-Lingual Embeddings for South African Languages

NLP Research Languages

Repository: Cross-Lingual-Embeddings-NLP-2026

An honours research project investigating a real problem: how do you build NLP systems for languages that don't have large amounts of digital training data?

The Challenge:

Most AI models perform well on English because there's abundant training data. South Africa has 11 official languages. If technology can't understand them, it can't serve the people who speak them. This project explores cross-lingual embeddings where knowledge learned from one language transfers to another.

Why This Work Matters:

Language is inseparable from culture and identity. If AI systems only work in English, they encode a particular worldview. This research contributes to making machine learning more inclusive and ensuring technology can serve diverse communities.

What We Did:

  1. Trained FastText embeddings for isiZulu, Sepedi, and Setswana
  2. Used orthogonal Procrustes mapping to align semantic spaces across languages
  3. Evaluated alignment quality through bilingual lexicon induction and downstream tasks
  4. Analyzed what makes alignment work (morphological similarity, vocabulary overlap, etc.)

Results Across Alignment Strategies:

Cross-Lingual Alignment Results

Final performance metrics across all alignment strategies

Strategy Comparison Between Languages:

Strategy Comparison

Comparing different embedding alignment techniques

Morphological Similarity Matters:

Translation Accuracy

Words that look similar across languages align better

Visualizing the Semantic Space (t-SNE):

t-SNE Embedding Space

How English and isiZulu semantic spaces align after Procrustes mapping

Key Findings:

  • Orthogonal Procrustes mapping creates stable, meaningful alignments
  • Morphologically similar languages transfer knowledge better
  • Just a few hundred bilingual word pairs can bootstrap high-quality embeddings
  • Anchor words act as bridges between semantic spaces

3. Electricity Demand Forecasting with ARIMA/ARIMAX

Time-series forecasting model predicting electricity demand using temperature and temporal variables. Achieves strong accuracy on multi-step forecasts.

Key Achievement: ARIMAX model outperforms ARIMA baseline by 23% when including exogenous variables.


Other Notable Work

Data & Analytics

  • Eskom Load Shedding Impact Analysis (Streamlit dashboards)
  • Youth Unemployment Analysis (Power BI visualizations)

Machine Learning

  • Graduate Prediction Models (Random Forest classification)
  • Model and Bias Audit (fairness evaluation)

Full-Stack Applications

  • SA Taxi Platform (fares, routes, seat selection, QR payments)
  • Smart Clinic Management System
  • Student Dashboard with NFC functionality

Technical Foundation

Backend Infrastructure
├─ Java & Spring Boot
├─ REST API design
├─ Microservices architecture
└─ System design

Data & Analysis
├─ Python data stack
├─ Statistical modeling
├─ Time-series forecasting
└─ ML pipeline development

Operations
├─ Docker containerization
├─ Prometheus monitoring
├─ Grafana dashboards
├─ ELK stack logging
└─ Kong API gateway

Language & NLP
├─ FastText embeddings
├─ Cross-lingual alignment
├─ Gensim toolkit
└─ Evaluation methodologies

How I Work

Start with understanding. What's the actual problem? What constraints exist? What does success look like?

Design for people. Not just now, but how this system will grow and how teams will collaborate on it.

Build observability in. Monitoring, logging, and metrics from day one. You can't fix what you can't see.

Document the reasoning. Why this approach? What were the tradeoffs? What might we change next time?

Learn and iterate. Each project teaches something. I carry those lessons forward.


Connect

Email GitHub LinkedIn


Profile Views

Built with intention. Crafted with care.

Continuously learning, building, and improving

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  1. youth_cloud_banking_system youth_cloud_banking_system Public

    Forked from Semicolon-survivors/youth_cloud_banking_system

    Copy-of-youth-banking-service

    Java

  2. Cross-Lingual-Embeddings-NLP-2026 Cross-Lingual-Embeddings-NLP-2026 Public

    Jupyter Notebook

  3. graduate-prediction-model graduate-prediction-model Public

    This project implements a machine learning model designed to predict whether a student will graduate or drop out based on key academic and financial factors. The model uses features such as course …

    Jupyter Notebook

  4. PowerBI_Lines-charts-and-columns PowerBI_Lines-charts-and-columns Public

    This Power BI (`.pbix`) file contains visualizations and analysis, but *the dataset is not included* due to licensing restrictions.

  5. eskom-demand-dashboard eskom-demand-dashboard Public

    Python

  6. Portfolio-2025 Portfolio-2025 Public