Janco van Heerden Backend Developer
Download CV BFN --:--

Portfolio
2026

Backend
Developer

Bloemfontein
South Africa

Open to
work

JANCO VAN VAN HEERDEN

Languages
C#, Python, JavaScript, SQL
Frameworks
.NET, MAUI Blazor, LINQ, REST APIs
Data & cloud
SQL Server, SQLite, Azure
Tools
Git, GitHub, HTML & CSS

Scroll

01 — About

I build backend systems in C# and .NET, and I spend just as much time learning how to break them. Writing secure software starts with understanding the attack.

Currently

Software Developer & Technician
Bloemfontein — since July 2024

I design and build the backend side of software — services, APIs and databases — and the occasional front-end and website too. I like clean, readable code, systems that stay fast and secure, and I'm always learning something new.

02 — Freelance

An accounting firm, a bakery and a primary school — three freelance websites, designed and built start to finish.

SJ Gerber Chartered Accountants website homepage
01

SJ Gerber Chartered Accountants

Accounting firm
Awa's Bakery website homepage
02

Awa's Bakery

Bakery
Koot Niemann Primêre Skool website homepage
03

Koot Niemann Primêre Skool

Primary school

03 — Projects

Things I've built

Projects

  1. 01

    Company Attendance Tracker

    Employee attendance with fingerprint scanning.

    C# · SQL Server · Hikvision
  2. 02

    CA Ticketing System

    Issue tracking for a chartered accountant firm.

    C# · .NET · SQL
  3. 03

    AI Object Detection

    Embedded app for object recognition.

    C# · Python
  4. 04

    Loading Bay Security

    Truck access control and monitoring at loading bays.

    C# · SQL Server
  5. 05

    Pen-Testing Lab

    Virtualized lab to simulate attacks and test defenses.

    Virtualization · Security
  6. 06

    Firewall Setup

    Rule-set tightening network access control.

    Networking · Security

04 — Experience

Experience

Jul 2024 — Present

Bloemfontein

Software Developer & Technician

  • Engineered POS modules in C#, improving transaction efficiency by 25%.
  • Built truck security apps for access control and monitoring at loading bays.
  • Integrated Hikvision fingerprint scanners with C# services for authentication and attendance.
  • Tuned SQL Server queries, cutting database response times by 40%.
  • Led a system upgrade: 30% faster transaction processing plus a new feature rollout.

Nov — Dec 2022

Bloemfontein

IT Support & Technician

  • Resolved 90% of 50+ hardware and software issues within 24 hours.
  • Installed and configured 50+ systems.
  • Upgraded network infrastructure to 99% uptime.

05 — Toolkit

What I use day to day

  • C# / .NETMAUI Blazor, LINQ, generics, DI, async/await, REST APIs
  • SQL ServerSQLite, query tuning, database design
  • PythonEmbedded AI, object detection
  • JavaScriptHTML, CSS, responsive front-end
  • AzureGit, GitHub, testing & debugging
  • NetworksFirewalls, configuration, troubleshooting

06 — Credentials

Credentials

MicrosoftAzure Data FundamentalsCertified
CertiportIT Specialist — JavaScriptCertified
CompTIAA+ ceCertified
SAQA 78965IT: Systems Development NQF 4Qualification
Tim CoreyC# Mastercourse, C# Fundamentals, SQL Server, Build an Embedded AI AppCertificates

Nov 2025 — Aug 2026

Tim Corey (IAmTimCorey)

C# Mastercourse, C# Fundamentals, SQL Server, C# front-end & back-end development. OOP, LINQ, generics, interfaces & DI, async/await, APIs, architecture, testing & debugging.

Mar — Dec 2024

CTU Training Solutions

Python Developer, Web Developer, IT Technician / Network Administrator, Database Administrator.