Full-Stack Developer
Open to remote work

Pierre Jonker

I build full-stack TypeScript apps with Next.js, NestJS, React and PostgreSQL.

At Lucentra Systems I built an internal task management system on my own, from the first commit to Azure, and the dev, design and management teams now use it every day. Before that I shipped features on a T3-stack system at Tech Genius and on Next.js and PostgreSQL apps at Fastway Couriers.

See my projects Resume

About

Most of my work is full-stack TypeScript: Next.js and React on the front, NestJS and Node.js services on PostgreSQL behind them, deployed to Microsoft Azure. I've worked across established codebases and brand-new ones, taking features from the database through to the UI, then through review, UAT and into production.

I want to keep growing in this stack while building my cloud and security skills. I'm looking for a growing company or startup with a supportive team, where I can take ownership of features and stay for the long term.

Selected work

What I've built

The system I built at Lucentra, and three projects I built end to end, each with a demo video and a write-up of how it works.

Lucentra Systems · Company project

Tasks
Kanban board
Bug reports
Time logging
Progress reports
Invoicing exports

Company code, so there's no public repository or demo.

In daily use

Internal task management system

Before this, the company tracked work in spreadsheets and nobody logged their time. I built a replacement on my own, from the database schema to the deployed app, and the dev, design and management teams now use it every day.

It brings tasks, a Kanban board, bug reports, time logging and management progress reports into one place. An invoicing module turns logged time into billable-hours exports, so billing now comes straight from recorded work.

TypeScript
NestJS
React
PostgreSQL
Docker
Azure
GitLab

Fitness training platform

Fit Track Hub

A gym trainer with many clients kept getting asked “what's my next exercise?”. Fit Track Hub lets trainers build a plan for each client, track progress and attendance, and lets clients log in to see their own programme.

Role: Solo: React frontend and Node.js API
Context: Built during my Compuways internship, 2024

React
Node.js
Express
MongoDB
Redis
Bull
Resend
Socket.io

How it works →Frontend code ↗Backend code ↗

Personal finance tracker

Jonker's Vault

Manage your money in one place. Sign up, record transactions by category, set budgets and track your progress towards financial goals.

Role: Solo: API, database and frontend
Context: Built during my Compuways internship, 2024

Java 17
Spring Boot 3
Spring Security
JWT
PostgreSQL
JPA
Swagger / OpenAPI
React

How it works →Code on GitHub ↗

AI chat widget · OpenAI API

Chat Bot

A chat widget that answers questions with the OpenAI API. Open it from the corner of the page, type a message, and the reply appears in the conversation.

Role: Solo: chat UI and API integration
Context: Web Bootcamp project, 2024

JavaScript
HTML
CSS
OpenAI API
GPT-3.5 Turbo

How it works →Code on GitHub ↗

Experience

Where I've worked

Jun 2026 – PresentNOW
Lucentra Systems
Junior Software Developer · Remote · Full-time
- Built an internal task management system from the ground up on my own with NestJS, React and PostgreSQL, replacing spreadsheet tracking. The dev, design and management teams use it daily.
- Brought tasks, a Kanban board, bug reports, time logging and management progress reports into one system. Before this, time wasn't logged at all.
- Built an invoicing module that turns logged time into billable-hours exports, so billing now comes straight from recorded work.
- Set up the GitLab repository, branching workflow and container setup, and proposed container hosting on Azure, which we then deployed.
- Found and fixed a critical transaction bug in a client's trading system that could have been exploited for financial gain, and verified the fix step by step in UAT.
- Deliver features and UI improvements across client systems, from the database to the frontend, tested in UAT before release.
- TypeScript
- NestJS
- React
- Next.js
- PostgreSQL
- Azure
Jun 2025 – May 2026
Fastway Couriers
Junior Full-Stack Developer · Remote · Full-time
- Built, maintained and extended Next.js applications in established codebases.
- Wrote and optimised SQL against PostgreSQL, and maintained the APIs behind internal frontends.
- Developed and maintained internal reporting interfaces in PHP, HTML and CSS.
- Worked through GitHub branches, commits and pull requests, and turned operations teams' needs into working features.
- Next.js
- PostgreSQL
- SQL
- PHP
- GitHub
Feb 2025 – Jun 2025
Tech Genius
Junior Software Developer · Remote · Contract
- Built and extended a management system for a fruit packhouse on the T3 stack (Next.js, TypeScript, Prisma, tRPC) with PostgreSQL.
- Delivered sprint work across UI, backend and database, including role-based permissions and a new section for tracking fruit cultivar test results, with filtering and reporting.
- Opened pull requests for senior review, then took changes through staging and UAT to production.
- TypeScript
- Next.js
- Prisma
- tRPC
- PostgreSQL
- Tailwind CSS
Jan 2024 – Jan 2025
Compuways
Software Developer Intern · Remote · Part-time internship
- Built Fit Track Hub, a MERN-stack fitness platform with a queued email service.
- Built Jonker's Vault, a personal finance app with a Spring Boot API, React frontend and PostgreSQL.
- Built a chatbot widget with JavaScript and the OpenAI API, alongside other development tasks during the internship.
- React
- Node.js
- MongoDB
- Java
- Spring Boot
- PostgreSQL

Skills

Where I've actually used each tool

Each dot is a job or project where the skill did real work. TypeScript first, because that's where I spend most of my time.

Skill	Lucentrajob	Fastwayjob	Tech Geniusjob	Fit Track Hubproject	Jonker's Vaultproject	Chat Botproject	This siteproject
Frontend & backend
TypeScript		Not used		Not used	Not used	Not used
Next.js				Not used	Not used	Not used
React		Not used				Not used
NestJS		Not used	Not used	Not used	Not used	Not used	Not used
Node.js		Not used	Not used		Not used	Not used	Not used
tRPC · Prisma	Not used	Not used		Not used	Not used	Not used	Not used
Tailwind CSS	Not used	Not used		Not used	Not used	Not used
Data
PostgreSQL · SQL				Not used		Not used	Not used
MongoDB	Not used	Not used	Not used		Not used	Not used	Not used
Redis · Bull queues	Not used	Not used	Not used		Not used	Not used	Not used
APIs, auth & AI
REST APIs			Not used			Not used	Not used
Role-based access		Not used			Not used	Not used	Not used
JWT auth	Not used	Not used	Not used			Not used	Not used
OpenAI API	Not used	Not used	Not used	Not used	Not used		Not used
Delivery
Microsoft Azure		Not used	Not used	Not used	Not used	Not used	Not used
Docker		Not used	Not used	Not used	Not used	Not used	Not used
Git · GitHub · GitLab						Not used
PR review · UAT releases				Not used	Not used	Not used	Not used
Also
Java · Spring Boot	Not used	Not used	Not used	Not used		Not used	Not used
PHP	Not used		Not used	Not used	Not used	Not used	Not used
Express	Not used	Not used	Not used		Not used	Not used	Not used

used in a job used in a project

Also used: MySQL · SQLite · Firebase · Material UI · NextAuth.js · React Hook Form · Zod · Swagger / OpenAPI · Postman. Languages: Afrikaans (native), English (fluent).

How I work

Reviewed, tested, then shipped

AI as a first draft

I use Claude Code every day to write and improve code, debug, research approaches and look for security improvements. I treat what it gives me as a first draft: I review every change, test it myself and make sure I understand the logic before it goes to PR review.

Extra care with money and data

When I fixed a critical bug in a client's trading system, I traced the transaction logic myself and verified the fix step by step in testing instead of trusting a generated fix, because client funds were at stake.

Review, staging, UAT, then production

At Tech Genius, Fastway and Lucentra my changes went through pull-request review and UAT before release. At Lucentra I set up the GitLab branching workflow the team now uses.

Database to deployment

At Lucentra I built a whole system on my own, from the PostgreSQL schema and NestJS API to the React UI and its containers on Azure. At Tech Genius I delivered sprint work across the UI, backend and database.

Education

Training

2024Web Bootcamp and Java Bootcamp certifications
Code College, Woodmead
2023National Senior Certificate (Matric)
Ligbron Academy of Technology

Certifications

Code College ZA, 2024

Course	Issued	Credential
Java Developer Bootcamp	Nov 2024	#4102
Spring Framework	Nov 2024	#4100
Java Advanced	Oct 2024	#4094
Java Beginner	Sep 2024	#4083
SQL	Aug 2024	#4045
Web Developer Bootcamp	Jul 2024	#4033
MERN Stack	Jun 2024	#4023
React	May 2024	#3981
Node.js	Apr 2024	#3959
Advanced JavaScript	Mar 2024	#3919

Contact

Let's talk.

I'm open to remote work as a full-stack developer. The quickest way to reach me is email.

jonkerpierre637@gmail.com

Write an email

ResumeResume
LinkedInpierre-jonker ↗
GitHubPierreJonker ↗
LocationErmelo, Mpumalanga