Backend-Focused Full-Stack Engineer

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Status: Online

Location: Cape Town, Western Cape

About.md

root@portfolio:~/readme$ cat profile.txt

Here is a little background

I’m a backend-focused software engineer with strong full-stack experience. I specialize in building secure APIs, complex integrations, and data-heavy systems that solve operational problems — not just UI problems. From OAuth flows and token lifecycle management to high-performance SQL and analytics logic, I engineer solutions that work under pressure and thrive in production environments.

RoleBackend-Focused Full-Stack Engineer

Contactsmkupa@gmail.com

Changelog

Full Stack Software Developer

GoGlobal Group (Technical Innovations)

HEAD

.NET Core

SQL Server

OAuth/JWT

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›Architect production-ready systems connecting real-world operations to scalable .NET software.
›Specialize in OAuth 2.0/JWT token lifecycle management and secure system integrations (Strava, Business Central).
›Design performance-first backend architecture using ASP.NET Core and Docker-based environments.
›Developed 'GoInsights', processing Strava activity webhooks and calculating performance metrics via optimized SQL stored procedures.

Junior Developer

Soft Serve Digital

v1.0

SQL Server

Power BI

.NET

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›Built logistics operational intelligence tools using advanced SQL (CTEs, Stored Procedures) and Power BI (DAX).
›Improved reporting accuracy by implementing document tracking classification logic for logistics workflows.
›Integrated external ERP endpoints and handled complex OData query parsing.

Dependencies

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C# / .NET 10

95%

ASP.NET Core

95%

SQL Server (CTEs/SP)

90%

OAuth 2.0 / JWT

90%

Keycloak

85%

Docker

80%

Power BI / DAX

85%

Dapper / EF Core

90%

Angular

80%

TypeScript

85%

Business Central API

85%

Agile / Scrum

95%

GitHub Actions / CI/CD

85%

Redis / Caching

80%

xUnit / Moq / Testing

85%

PostgreSQL / MySQL

85%

Linux / Bash

75%

OData / Webhooks

90%

Deployments

https://github.com/Le-Fox/chrip

Build 1: Chrip (T3 Stack)

Next.js

tRPC

Prisma

Tailwind

A modern full-stack application built using the T3 Stack (Next.js, tRPC, Tailwind, Prisma, Planetscale, and Clerk). Showcases advanced patterns in type-safe API development and serverless architecture.

https://github.com/Le-Fox/Go-Monsta

Build 2: Go-Monsta

Concurrency

A performant backend service written in Go, demonstrating efficient concurrency handling and clean architecture principles. Focuses on low-latency data processing.

https://github.com/Le-Fox/Doomscrolling_Blocker

Build 3: Doomscrolling Blocker

JavaScript

Automation

A productivity tool designed to combat addictive digital behaviors by monitoring and limiting time spent on specified platforms. Built with a focus on system-level integration and user flow.

Build 4: GoInsights – OAuth & Analytics

ASP.NET Core

Strava API

SQL Server

Docker

A backend-driven platform integrating with Strava API to process activities and manage complex OAuth token lifecycles. Features dynamic challenge scoring and performance-focused SQL Summaries.

Build 5: Enterprise Auth & Keycloak

.NET 10

Keycloak

JWT

Swagger

Designed secure authentication schemes with .NET 10, Keycloak, and JWT. Solved complex token lifecycle issues and optimized cross-origin configurations for production environments.

Build 6: Logistics Operational Intel

SQL Server

Power BI

.NET

A private enterprise-scale business intelligence tool designed to track and optimize logistics workflows. Built with advanced SQL (CTEs, Stored Procedures) and Power BI to provide real-time operational insights.

Build 7: Business Central Integration

Business Central

OData

.NET Core

Managed the end-to-end integration with Microsoft Business Central APIs. Included complex OData query parsing, webhook handling, and document tracking classification logic for enterprise logistics.

Contact

I have got just what you need. Lets Talk.

063 733 6440

smkupa@gmail.com

Cape Town, Western Cape