For three years, I’ve been building Calendrz in my spare time. It’s a calendar mirroring platform — it keeps your availability in sync across all your Google and Microsoft calendars so you never get double-booked. Three years of evenings and weekends, chipping away at it between a full-time job and life.

Then I spent one week orchestrating AI coding agents — specifically Claude Code — and shipped more in those seven days than in the entire three years before.

This isn’t hype. This is what actually happened.

What Got Done in One Week

Let me walk you through the list, because even I find it hard to believe when I look at it all together.

A Complete Marketing Website Refresh

The calendrz.com marketing site got a full redesign and rewrite. New copy, new layout, new messaging — all aligned with the product’s current capabilities and positioning. Not a quick reskin. A proper refresh.

A Google Chrome Extension

I shipped a Chrome Extension that lets you manage your calendar mirroring directly from the browser toolbar. Connect accounts, check sync status, trigger syncs — all without leaving whatever you’re working on.

An MCP Server for AI-Native Calendar Management

This one is close to my heart. I built an MCP server for Calendrz, and I actively use it myself from Claude Desktop. I can manage my calendar mirroring setup, check events, trigger syncs, and adjust preferences — all through natural language. It’s the kind of interface that makes you wonder why we ever clicked through settings menus.

Stripe Integration and Paid Tiers

Calendrz now has a proper subscription model powered by Stripe. Four tiers, priced to be accessible:

• Free — $0/month. 1 connected account, 11-day lookahead, basic mirroring. Enough to try it out and see the value.
• Basic — $1.99/month. 2 connected accounts, 11-day lookahead, manual sync trigger, push notifications.
• Plus — $3.99/month. 3 connected accounts, 30-day lookahead, manual sync trigger, push notifications.
• Pro — $5.99/month. 5 connected accounts, 30-day lookahead, full customization of mirroring behavior, push notifications.

From zero revenue infrastructure to a fully integrated billing system — in days, not months.

Infrastructure Agents That Run the Show

I set up a suite of AI agents that manage the entire deployment pipeline and infrastructure. They handle CI/CD, monitor production, and can diagnose server issues when things go wrong. These aren’t just scripts — they understand context, read logs, correlate errors, and suggest fixes. It’s like having a junior DevOps engineer on call 24/7.

A Custom CRM (and Goodbye, HubSpot)

This deserves its own section — see the sidebar below. The short version: I built a full CRM tailored to Calendrz’s exact needs and dropped HubSpot entirely.

Content Automation Agents

I now have AI agents that draft and push content to the marketing site, LinkedIn, and social media. They understand the product, the tone, the audience. They don’t replace editorial judgment, but they handle the heavy lifting of content creation and distribution.

Sidebar: Traditional CRM Is Dead for Small Businesses

This is the hot take I didn’t expect to have, but here we are.

I used HubSpot for Calendrz. It was clunky. It was heavy. It was expensive for what it delivered. And the worst part? It was generic. A one-size-fits-all solution that fit nobody particularly well.

When I realised I could instruct AI coding agents to build a CRM tailored to my exact workflows — my specific lead stages, my contact fields, my follow-up sequences, my reporting needs — in under a week, the decision was obvious.

I believe traditional CRM solutions are dead for SMEs. The era of paying hundreds of pounds a month for bloated enterprise software that requires a consultant to configure is ending. With AI coding agents, any founder or small team can get a highly customized CRM that fits their specific needs like a glove. Not in six months of implementation. In days.

If you’re a small business still paying for HubSpot, Salesforce, or Pipedrive and barely using half the features, ask yourself: could an AI agent build exactly what you need, and nothing you don’t?

I already know the answer.

What Calendrz Actually Does for You

If you’ve made it this far and you’re wondering what Calendrz is all about, here’s the plain-English version:

• Never get double-booked again. When you’re busy in one calendar, Calendrz automatically blocks that time in all your others. Your work calendar knows about your personal appointments. Your freelance calendar knows about your day job.
• Works with Google and Microsoft. Google Workspace, personal Gmail, Microsoft 365, Outlook — mix and match however your life is structured.
• Automatic and continuous. Set it up once and forget about it. Calendrz checks your calendars regularly and keeps everything in sync without you lifting a finger.
• Chrome Extension for quick access. Manage your mirroring setup right from the browser toolbar — no need to open another tab or app.
• MCP integration for AI-native users. If you’re already living inside Claude or similar AI tools, you can manage Calendrz through natural language. It’s the future of software interaction, available today.
• Flexible pricing. Start free. Upgrade when you need more connected accounts or longer lookahead windows. Pro is $5.99/month — less than a coffee.

The core promise is simple: if you juggle multiple calendars, Calendrz makes sure they all tell the same story about when you’re available.

The Bigger Picture: Software Engineering + Business Context + Agent Orchestration

Let me be clear about what happened here. This wasn’t “AI built my product for me.” I have three years of domain knowledge, architectural decisions, and battle-tested code in this project. The foundation was solid.

What Claude Code and AI agents gave me was leverage. The ability to parallelise work that would have taken months of solo effort. The ability to ship a Chrome Extension, a billing system, a CRM, infrastructure automation, and a marketing refresh — simultaneously — because I could orchestrate agents to handle the implementation while I focused on product decisions and architecture.

The result: one week of orchestrating AI agents achieved more than three years of spare-time solo development.

I don’t think this makes software engineers obsolete. Quite the opposite. The people who will thrive are those who combine three things:

1. Deep software engineering knowledge — you need to understand what you’re building, review what agents produce, and make architectural decisions that compound well over time.
2. Strong product sense — knowing what to build is more important than ever when you can build anything fast.
3. The ability to set up and orchestrate AI agents — treating them as a team, giving them the right context, breaking work into parallelisable chunks, and reviewing output with a critical eye.

That combination is the new superpower. Not AI replacing engineers. Engineers wielding AI as a force multiplier.

If you manage multiple calendars and you’re tired of double-bookings, give Calendrz a try — it’s free to start. And if you’re a developer with a side project gathering dust, maybe it’s time to see what a week of agentic development can do.