How We Built a Fully Automated Blog Generator Using GenAI, WordPress, and Google Cloud

Imagine waking up every morning to find a fresh, engaging blog post magically published to your website — one that’s perfectly aligned with your audience’s interests, complete with a unique featured image, and even optimized for SEO. No writers, no design team, and certainly no 5am content marathons. Just pure, beautiful automation.

That’s what we set out to create: an AI-powered blogging machine that could think, write, illustrate, and publish all on its own. And we did it. This is the story of how we built SimpleFitness Blog, a system that generates and publishes daily health and fitness blog posts in multiple languages — completely on autopilot.

The Spark of an Idea

We wanted to solve a very real problem: the time and effort it takes to consistently create high-quality content. Every brand, startup, and solo creator knows this struggle. Either you spend hours writing posts or outsource to someone else and cross your fingers. But what if you could let a machine do the heavy lifting — and do it well?

So we asked ourselves: What if a blog could write itself? And not just any blog. One that pulls inspiration from real-world news, writes with personality, includes beautiful visuals, and speaks multiple languages.

Building the Brain — OpenAI’s GPT-4 and Agentic Prompting

The core of our system is OpenAI’s GPT-4. But we didn’t just feed it random prompts and hope for the best. We built an agentic workflow that simulates a human researcher and writer.

Each day, the system starts by scanning real news — specifically, WHO’s RSS feed — for trending health-related topics. It doesn’t use the headline directly. Instead, it combines that information with a library of evergreen fitness angles to create something fresh and meaningful.

For example, one day the topic might be:

“What tracking your flexibility says about your stress levels (inspired by a WHO alert on public health disruptions).”

This hybrid topic is then passed to GPT-4 with a detailed prompt asking for a blog post in a specific tone — warm, humorous, and informative.

The result? A fully-written blog post that feels like it came from a passionate fitness coach who happens to love storytelling.

From Thought to Image — Generating Visuals with DALL·E 3

A good blog needs a compelling image. But stock photos are dull and overused. So we trained DALL·E 3 to become our in-house designer.

Once the topic is selected, the system crafts a prompt to generate a high-quality image with clean, vibrant aesthetics — the kind you’d want to share on social media or pin to your fitness board.

The image is uploaded to WordPress and becomes the featured visual for the blog post. The same image is used across languages to keep things simple and consistent.

The Hidden Power of SEO — Injecting Metadata Like a Pro

To ensure each post performs well, we built a custom seo.py module that generates:

A short and catchy SEO title
A meta description under 155 characters
A clean URL slug
Relevant tags and categories

This data is added invisibly to the post to help with search engine visibility — and it works behind the scenes without cluttering the content.

We even wrap the SEO details in HTML comments inside the blog body to future-proof the design for WordPress themes that might one day leverage them.

Packaging It for the World — Flask, Docker, and Google Cloud Run

The entire blog generator runs on a Flask app. It’s a lightweight server that handles a single endpoint (/). When hit, it goes through the whole process:

Generate prompts
Generate an image
Generate the blog post
Inject SEO and visuals
Upload the featured image
Post to both English and German WordPress blogs

We wrap this app in Docker and deploy it to Google Cloud Run, giving it autoscaling, secure HTTPS, and virtually no maintenance overhead.

It looks like magic, but it’s just smart architecture.

Automation Without a Finger Lifted — Cloud Scheduler + Pub/Sub

We didn’t want to hit the endpoint manually every day. So we used Google Cloud Scheduler to trigger a Pub/Sub message at 7am PST.

Cloud Run listens to this message and fires up the Flask service. This hands-free automation means we can sip our morning coffee while the blog practically writes itself.

The Real-World Result

This entire system runs live at thomaspanas.com, where you can read daily articles on fitness, sleep, nutrition, and long-term health.

Each post is:

Written from scratch every day
Inspired by current health news
Available in English and German
SEO-optimized
Illustrated with a unique AI-generated image

And it all happens with zero human interaction after setup.

Why This Matters

We built this because we believe small creators and indie developers should have access to tools that rival enterprise marketing teams. With GenAI, automation, and a bit of clever engineering, you can now build systems that do the work for you — at scale, and with personality.

If you’re dreaming of building your own autonomous content engine, know this: it’s not just possible. It’s already happening.

Explore the live result at thomaspanas.com — and let it inspire you to automate your own ideas into reality.

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