Corné Kotze
Security-first engineer with a decade of building everything from banking systems to trading algorithms. Most of my work lives behind NDAs — and I prefer it that way engineering. I build performant, scalable applications that users love.
The Code Behind the NDA
I started in 2016 building websites for local businesses and never looked back. Since then I've gone deep — from full-stack freelance work to banking system security patches, bug bounty programs, blockchain tech, and custom quant trading algorithms.
Most of my best work is confidential, and I push for it that way. Security is my strongest suit — I'd rate myself 10/10 without hesitation. From machine learning pipelines to internal enterprise platforms, I build things that work and things that can't be broken.
My Tech Stack
A constantly evolving toolkit built through years of real-world projects and continuous learning.
Frontend
Backend
Cloud & DevOps
Data & Storage
Security
Testing & Quality
Featured Work
From public apps to classified systems — a curated selection of what I can actually talk about. The best stuff? Under lock and key.
PulseChart ePCR
Electronic Patient Care Report system for South African EMS. Fully POPIA and HPCSA compliant. Built as a 2-man team — I designed and developed the entire ePCR engine.
Placi.net
Local business directory platform where businesses can list and be found. Full-stack solo project — built in my own time because I was bored and saw a gap.
Tigani Internal Platform
All-in-one enterprise system for Tigani Plant Hire — fleet tracking & maintenance, stock control, farm management, and operations. My entire career encapsulated into one program.
Banking System Security
Contracted for almost a year helping with critical security patches and fixes for a banking system. Full NDA — probably shouldn't even mention this one.
Bug Bounty Programs
Invited to multiple private bug bounty programs and actually made a living hunting vulnerabilities for a while. Found critical bugs across major platforms.
Quant Trading Algorithms
Custom quantitative trading algorithms built for clients. Very hard NDA on these — got paid well for a few custom ones. Can't say more than that.
Blockchain Solutions
Deep dive into blockchain technology — smart contracts, DeFi protocols, and distributed systems. Built custom solutions for various clients under NDA.
Protea Hotels App
Part of the team that built a cleaner management app for Protea Hotels (Marriott group). My role was the entire front-end implementation.
Bond Calculator Plugin
WordPress plugin for an attorneys' firm website that calculates housing/bond-related figures. Still live and in use today.
Farm Panic App
Native Android panic button app — press the lock button 5 times to silently call emergency services and listed contacts. Built for the farming community in my locale.
Where I've Been
From local freelance gigs to classified banking systems — a decade of building things that matter, mostly behind closed doors.
Built and maintain a comprehensive internal platform covering fleet tracking, vehicle maintenance scheduling, stock control, and farm management operations. Solo-designed the entire system architecture from scratch.
Went deep into machine learning — neural networks, NLP, computer vision, and applied ML. Building models and integrating AI capabilities into existing systems and new projects.
Almost a year as a contractor helping with critical security patches and fixes for a banking system. Full NDA — can't say much more than that. Probably shouldn't even mention it.
Built custom programs for various businesses and corporations under NDA. Got invited to private bug bounty programs and made a living off vulnerability hunting. Also worked with blockchain technology and built quant trading algorithms.
Started my journey building a website for a local spaza shop, then a cash register system, front-end for the Protea Hotels (Marriott) cleaner app, a native Android panic button app, a job board, and a WordPress bond calculator plugin that's still live at binc.co.za.
Let's Work Together
Have a project in mind or just want to chat? I'm always open to discussing new opportunities and ideas.
I'm currently available for freelance work and full-time positions. If you have a project that needs coding, a team that needs a developer, or a problem that needs solving — let's connect.