Founded by a veteran engineer with 30+ years of hands-on IT experience. US-registered, remote-first, and built for global delivery.
Founder & Lead Consultant
Stack Shop was founded by Sarel Pieterse, an engineer and technologist with over 30 years of experience spanning enterprise IT infrastructure, business systems, networking, embedded control, renewable energy, and artificial intelligence.
What started as a one-person consulting practice has grown into a US-registered limited liability company with a distributed team spanning continents. Sarel’s career has taken him from building Microsoft-based business environments and VoIP networks to deploying solar systems at scale, designing IoT sensor networks, and building AI agents for modern business automation.
Today, Stack Shop brings that full-spectrum technical depth to every engagement — from a single consulting call to multi-month integration projects with ongoing managed support.
How we work, what we stand for, and why it matters to our clients.
We build what works in production — not in slide decks. Every solution is designed for the real-world constraints of latency, power, legacy systems, and the people who operate them.
We recommend what fits your problem, not what pays commission. Our consulting starts with your stack, budget, and constraints — no upselling, no lock-in.
From discovery and architecture through deployment and support — we own the outcome. You get one team accountable for the entire lifecycle.
US-registered with a remote-first team spanning time zones. American business accountability with the speed and flexibility of global talent.
Clear deliverables, transparent milestone-based billing, and regular updates throughout every engagement. No black boxes, no surprises.
Technology changes fast. We invest in staying current so our clients don’t have to — from the latest AI frameworks to evolving IoT standards and cloud architectures.
Three decades of technical evolution — from Windows NT to AI agents.
Built and managed Microsoft-based business environments, TCP/IP networking, firewall infrastructure, and early internet services.
Designed and operated hosting platforms, email systems, VoIP telephony, and web infrastructure for small-to-medium businesses.
Moved into embedded systems and IoT — building sensor networks, MQTT brokers, and custom automation frameworks that bridged IT and the physical world.
Through Gridline Power, designed and maintained 500+ solar systems across 1,000+ sites in Cape Town, combining electrical engineering with smart monitoring.
US-registered company launched, combining decades of infrastructure experience with modern AI, LLM integration, computer vision, and intelligent automation.
Delivering AI agent systems, middleware integrations, CCTV intelligence, smart infrastructure, and managed services for clients in the US and globally.
What sets us apart from other technical consultancies.
From bare-metal networking and embedded controllers to cloud-native architectures and AI agents — we’ve worked at every layer.
Registered US LLC with a Cape Town-based core team and remote collaborators worldwide. We deliver across time zones without overhead.
Discovery, architecture, implementation, deployment, and support — one team accountable for every phase.
One-time consulting, fixed-scope projects with milestone-based payments, or ongoing subscription-based support.
Our solutions factor in power constraints, network latency, legacy compatibility, and the humans who operate them.
We work with companies like Brisch and Xstreamline on automation and integration projects. Built on delivery, not promises.