Henk & Ellen Rensenbrink · Netherlands

Clear engineering for websites that need to work, scale and stay safe.

A family team with more than 15 years of website development experience, building custom WordPress and WooCommerce solutions, Python applications and practical API integrations.

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Sandbox-first delivery
Visible progress
Controlled releases

Selected work

Complex systems, made understandable.

These public case studies explain architecture, decisions and results while keeping customer data and production secrets private.

SiteGuardly website scan result interface

WordPress platformSecurity · SEO · APIs

SiteGuardly Platform

A custom website quality, security and technical SEO platform with connectors, structured findings, customer reporting and controlled releases.

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Our WordPress products

Guardly Flow
Request → Quote → Sign → Invoice

Guardly Gift
Purchase → Deliver → Redeem

One shop, connected customer journeys.

WordPress & WooCommerceCustom products

SiteGuardly Shop, Flow & Gift

Our own shop and plugins connect quotations, invoices, gift cards, subscriptions, per-site licences, updates and customer support. Ledger accounting integrations are in development and await separate provider verification.

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Frisiana · work in progress

Club website
Responsive design
Events and registrations
PDF exports
Results workflows

Reviewed in a protected Sandbox.

Custom WordPressClub website

Frisiana

A club website redesign with custom functionality, events, registrations and results workflows. This project is presented as work in progress, with public examples kept separate from private data.

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Python applicationData · Automation

ETF AI Bot

A defensive research and automation platform with data-quality gates, explainable decisions and a strict separation between research and execution.

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Python applicationIoT · Local-first

Smart Home Operations

A resilient interface combining energy, lighting, audio, network and household systems without exposing private device credentials.

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ProviderAdapter.php

public function apply(
  int $recordId,
  array $payload
): array {
  $validated = $this->validate($payload);
  $result = $this->persist($validated);
  $this->audit->append($result);
  return $result;
}

Public code samplePHP · Tests

Workflow Adapter Demo

A working PHP example that centralises admin, CSV and webhook changes behind one testable state-change boundary.

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Expertise

From first diagnosis to verified release.

Web platforms

Custom WordPress and WooCommerce architecture, themes, plugins, dashboards and migrations.

Integrations

REST APIs, OAuth, webhooks, CRM, commerce, payment, accounting and marketplace connections.

Python systems

Responsive dashboards, data pipelines, scheduled tasks, automation and resilient API clients.

SEO & performance

Technical audits, structured data, information architecture, tracking and measurable remediation.

Security

Malware investigation, hardening, access control, audit trails and safe recovery procedures.

Long-term quality

Tests, documentation, staged delivery, monitoring and maintainable code ownership.

Delivery process

The client sees the work. The live audience sees only the finished result.

When the platform permits it, development takes place in a private sandbox. Progress, priorities and feedback remain visible on a shared Trello board. Henk leads technical development; Ellen handles client communication and coordination.

01
Understand
Clarify the objective, risks, data and acceptance criteria.
02
Build privately
Implement and test in a controlled environment.
03
Review together
Share progress, receive comments and record approval.
04
Release safely
Deploy, verify and document the completed change.

Public evidence, private responsibility

Good engineering should be visible without exposing what must remain protected.

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