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Mario

About Me

Hi, I'm Johan, and I'm the technical muscle behind Software Plumber.

After 35 years spent building robust, rock-solid software systems for both SMEs and large corporations, I decided to focus my decades of expertise right here in South London. I saw a clear need for reliable and personal software expertise available to local businesses. My goal is simple: to be your local, trustworthy and dedicated partner for those exact needs.

Pricing

I believe in transparent pricing that reflects the time and value I deliver. Before any work begins, I provide a detailed time estimate. Once we agree on the plan and a 50% deposit is received, I dive in.

Many projects are dynamic — as you see the work come together, you might want to pivot or refine the direction. This is natural and welcome! Refactoring often leads to better solutions. However, major revisions that significantly change the original scope may require a small, pre-agreed adjustment to the final payment.

I use tiered pricing to ensure you get a better value on larger projects. Fractions of time will be rounded to the nearest half day/week/month.

Duration of WorkRateHourly Equivalent
Micro-Tasks (1 - 8 hours)£50 / hour£50 / hour
Small Projects (1 - 5 days)£360 / day£45 / hour
Mid-Size Projects (1 - 3 weeks)£1,600 / week£40 / hour
Large Projects (more than 4 weeks)£5,600 / month£35 / hour

Estimated Examples

Websites

Bespoke Websites

Your 24/7 Digital Shop Front

I build the core of your online presence — a streamlined, trustworthy machine designed to turn local visitors into paying customers, easily viewed on any device.

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    Modern Brochure Site Professional, mobile-first design for service businesses (e.g., Lawyer, Locksmith).
    3 - 3.5 weeks £4,800 to £5,600
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    Online Booking Portal Allows customers to schedule services and pay deposits 24/7 (Hair Care, Dentist).
    3 - 4.5 weeks £4,800 to £7,200
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    Interactive Gallery Site Visually focused showcase for large inventory or custom work (Furniture, Art Gallery).
    3 - 3.5 weeks £4,800 to £5,600
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    Menu & Order-Ahead Simple web ordering system integrated with local restaurant or cafe operations.
    2 - 3 weeks £3,200 to £4,800
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    Membership Portal Secure area for paying subscribers to access exclusive content (Local Club, Fitness Studio).
    4 - 5.5 weeks £6,400 to £8,800
Applications

E-commerce & Apps

Tools Tailored to Your Trade

When off-the-shelf software just doesn't fit, I personally craft dedicated, high-performance apps for your staff's specific needs, whether they're at the desk or on the road.

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    E-commerce Platform Integration Syncs in-store inventory to an online shop (Clothing, Home Goods Store).
    4 - 5.5 weeks £6,400 to £8,800
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    Quick Quote/Estimating Tool Desktop tool for field staff to generate accurate job quotes (Electrician, Roofing).
    2 - 3 weeks £3,200 to £4,800
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    Appointment Check-in Kiosk App Simple tablet or touchscreen app for customer self check-in (Gym, Dentist).
    1 week £1,600
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    Barcode Generator/Scanner App Generates internal barcodes and logs scans (Warehouse, Small Manufacturer).
    1.5 - 2.5 weeks £2,400 to £4,000
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    Field Service Data Collector App Mobile app for technicians to log site data and photos (Inspection, Maintenance).
    2.5 - 3.5 weeks £4,000 to £5,600
AI

Artificial Intelligence (AI)

Smart Tools for Smarter Decisions

I integrate affordable, practical AI models into your existing systems to automate decisions, predict outcomes, and provide critical business insights right when you need them.

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    Simple Sales Trend Forecaster Analyzes past POS data to predict staffing and inventory needs (Food, Convenience Store).
    1 week £1,600
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    Personalized Product Recommender Basic script suggesting items based on local customer history (Pet Store, Book Store).
    2 - 3 weeks £3,200 to £4,800
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    Spam/Bot Comment Filter Custom filter using language models to clean up online community boards (Church, School).
    3 - 5 days £1,080 to £1,800
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    Image-Based Inventory Sorter Uses vision to rapidly categorize newly photographed items (e.g., used car parts).
    2.5 - 3.5 weeks £4,000 to £5,600
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    Document Summarizer (Internal) Tool to quickly summarize long legal or operational documents for staff (Legal, Real Estate).
    1.5 - 2 weeks £2,400 to £3,200
IoT

Internet of Things (IoT)

Bridging the Digital and Physical World

I use simple, powerful hardware (like Raspberry Pi and sensors) to bring real-world data into your business. I build practical IoT solutions that provide custom tracking and notifications.

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    Connected LED Status Boards Displays live availability or wait times using bright, updated LED signs (Bar, Hair Salon).
    1 week £1,600
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    Environmental Monitoring Uses sensors to track temperature/humidity for storage areas (Bakery, Florist).
    1 week £1,600
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    Fleet GPS and Geofencing Tracker Monitors vehicle location and service area compliance (Car Rental, General Contractor).
    1 week £1,600
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    Visitor Counter Integration Simple sensor integration to measure real-time foot traffic (Retail Store, Art Gallery).
    1 week £1,600
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    Asset Tracking (Small Tools) Simple RFID/Bluetooth tracking for small, high-value tools in a workshop.
    2 - 3 weeks £3,200 to £4,800
Integration

Operating Services

The Invisible Plumbing That Keeps You Flowing

These are the backend systems that automate the boring stuff. I work to safely connect your disjointed software (POS, accounting, inventory) and automate processes wherever the systems allow me to.

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    E-commerce to Inventory Sync Engine Automated background service that keeps stock levels accurate across platforms.
    2 - 3 weeks £3,200 to £4,800
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    Accounting Software Bridge Script that formats POS data for automatic import into Xero/QuickBooks (Accountant, Store).
    1 - 2 weeks £1,600 to £3,200
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    Automated Invoice Generator Converts technician job logs into professional invoices (Locksmith, General Contractor).
    3 - 5 days £1,080 to £1,800
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    Daily Backup & Health Check Automated script for local file backups and system health summary email.
    1 day £360
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    Stock Low-Alert Trigger Sends an SMS/email alert to the manager when a crucial item falls below a threshold.
    1 - 3 days £360 to £1,080
Dashboard

Dashboard Systems

See Your Business Health Instantly

Stop digging through spreadsheets. I build custom dashboards that pull live data from every corner of your business, giving you a clear, visual report of your key metrics in one place.

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    Real-Time Sales & Stock Dashboard Displays sales targets and urgent low-stock alerts on a dedicated screen (Cafe, Store).
    2 weeks £3,200
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    Job Progress Tracker (Kanban) Visualizes the status of every active job for field service teams (Roofing, Electrician).
    1 - 2 weeks £1,600 to £3,200
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    Reservation/Occupancy Tracker Live view of available rooms or tables (Lodging, Bar).
    2 weeks £3,200
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    Supplier Delivery Status Monitor Tracks outstanding orders and ETA status from key suppliers.
    2 weeks £3,200
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    Inventory Age Dashboard Highlights stock items that have been sitting unsold for a defined period.
    2 weeks £3,200

Let's Talk

Ready to finally fix that leaky system or build the tool that will grow your business? Get in touch with me directly—I'm always happy to talk through your challenge and give you an honest perspective on the best way forward.

The first step is understanding your vision. Please follow this simple structure and send it to me as your initial email:

1. Capture Your Dream

Tell me your overall goal. Focus on the why and what. What will this software allow your business to do that you currently can't?

2. Break it Down

Take that big dream and break it into smaller topics or features. Look at the categories we listed on this page (e.g., Websites, Dashboard Systems, Bespoke Apps) as example to help structure your thoughts.

3. Send me the Details

For each main topic, break it down further into specific bullet points describing what that part of the system needs to do.

Example structure for your email:

  • Topic 1: Online Booking System
    • Needs to check staff availability in real-time.
    • Must accept £10 non-refundable deposits via Stripe.
    • Must send automated SMS confirmation 1 hour before the appointment.
  • Topic 2: Dashboard Monitor
    • Needs to display today's sales vs. target on a single screen.
    • Needs to flag inventory items that are below stock level 5.

What Happens Next?

Once I receive your detailed email, I will study your needs thoroughly. I will then send a response, and we can quickly agree on a date and time to meet. We can meet at your business, a quiet local cafe, or any location that is convenient for you to discuss the project in detail.

I look forward to hearing about your project!