DEV Community: Anurag Seervi

Designing the Backend Architecture for a Multi-Category Services Platform

Anurag Seervi — Tue, 29 Jul 2025 12:50:23 +0000

Building a platform like ServiceTasker — a multi-category services marketplace — is not just about getting listings online. The real complexity lies under the hood: designing a backend architecture that is flexible, scalable, and optimized for real-time interactions across different services like plumbing, pest control, electricians, and more.

In this article, we’ll walk through the backend architectural decisions behind building such a platform, the database models, API layers, and how we handled category flexibility, provider-customer interaction, reviews, and booking flows.

Whether you're building a similar services marketplace or a niche gig-based platform, this guide will help you understand the foundational backend considerations.

1. Project Setup and Stack

Tech Stack Chosen:

Backend: Node.js with Express (could be Laravel or Django too)
Database: PostgreSQL (relational structure helps for multi-relational data)
Caching: Redis (for sessions and frequently accessed data)
Authentication: JWT with role-based access
Storage: AWS S3 (for storing profile photos, invoices, etc.)
Queue Management: Bull (for job queues like email reminders)

We used ServiceTasker (by SAER Technologies) as the real-world build, which handles hundreds of subcategories across multiple cities in Australia.

2. Designing the Core Database Schema

To support multiple service categories, providers, cities, and customer actions, we designed a modular and relational DB structure.

Key Tables:

users (with roles: customer, provider, admin)
categories → (e.g., Electricians)
subcategories → (e.g., Emergency Electricians)
locations → (e.g., Sydney, Melbourne)
services (actual listings posted by providers)
bookings
reviews
quotes (optional quoting system)
notifications

Example: Services Table Schema

This allows us to easily filter or group services by location, category, or both — perfect for URLs like:

3. API Layer with REST + Role-Based Logic
We designed a modular REST API layer with Express, structured as:

/api/auth/ → login, signup, role assignment
/api/services/ → list, create, update
/api/bookings/ → book service, cancel, reschedule
/api/users/ → view profiles
/api/reviews/ → submit/view reviews
/api/quotes/ → (optional) handle quote requests Each route checks the JWT and enforces role-based access:

4. Handling Category and Subcategory Logic

Each category and subcategory can have unique attributes. To avoid schema bloat, we used a JSONB column in PostgreSQL to store additional dynamic fields.

For example:

This keeps the core schema clean while supporting attribute variations across service types.

5. Booking System Architecture

The booking flow was the most complex part:

The user selects a service
Choose a time slot (if enabled)
Enter the address and confirm the booking
Provider gets notified
Status transitions: pending → accepted → completed → reviewed We stored each transition with timestamps for analytics and audit:

6. Notifications and Real-Time Updates

For notifications, we used:

Redis + Bull for email reminders and job queues
WebSockets (Socket.io) for real-time chat between users and providers
Push notifications via Firebase (for mobile version)

7. Search & Filters

To handle filtering by:

Location
Category/Subcategory
Rating
Price ...we created index-based queries and used ElasticSearch for advanced search in later iterations.

We implemented geolocation support via PostGIS to enable “near me” functionality.

8. Review System with Fraud Detection

To reduce fake reviews, we:

Allowed reviews only after completed bookings
Used IP logging and email flags to spot duplicate accounts
Built a backend script to flag suspicious review patterns

This helped ensure genuine trust signals across the ServiceTasker platform.

9. Admin Dashboard

Admins needed to:

Approve new service providers
Suspend fake profiles
Edit listings
Moderate reviews We built a separate admin dashboard with role-level restrictions and bulk update tools using DataTables + Bootstrap.

10. Scalability Considerations

Some optimizations included:

Load balancing using Nginx
Horizontal scaling for the app server (Node.js cluster mode)
Read replicas for the database in high-traffic areas
Daily cron jobs to clean inactive data

11. Testing and DevOps

Just for unit and integration tests
Postman + Swagger for API documentation
Docker for isolated environments
CI/CD using GitHub Actions

Final Thoughts

Designing the backend architecture for a multi-category services platform like ServiceTasker isn't trivial. It requires thoughtful modeling, extensible schemas, and strong API controls. By modularizing components like bookings, reviews, and notifications, we created a system that's flexible enough to support everything from local electricians in Sydney to tree removal pros in Adelaide.

Whether you’re planning to build a similar platform or contributing to one, I hope this walkthrough gives you real-world insight into making scalable service systems work.

Colorbond vs. Timber: Which Fence Is Cheaper to Install?

Anurag Seervi — Thu, 24 Jul 2025 07:55:44 +0000

Fencing is one of the most important aspects of a home’s exterior — not only does it define your boundary, but it also adds privacy, security, and curb appeal. Among the most popular fencing materials in Australia, Colorbond and timber are often the top contenders for homeowners. But when it comes to installation costs, which one gives you more value for your money?

In this article, we’ll break down the cost differences between Colorbond and timber fencing, including the materials, installation charges, maintenance, and long-term value — so you can make a smart choice that suits your budget and property.
What Is Colorbond Fencing?
Colorbond is a pre-painted steel fencing material manufactured to withstand Australian conditions. It’s known for being durable, fire-resistant, and low maintenance.

Key Features:

Steel-based and weather-resistant
Comes in a range of colours
Rust and termite resistant
Low maintenance and long lifespan (15–30 years)

What Is Timber Fencing?

Timber fencing is made from natural wood — usually treated pine or hardwood — and is a more traditional choice in Aussie homes, especially in suburban or rural areas.

Key Features:

Natural aesthetic
Easy to paint or stain
Can be cheaper upfront
May require ongoing maintenance (painting, sealing, repairs)

Colorbond vs. Timber: Installation Cost Comparison

Let’s break down average costs across Australia in 2025. Prices can vary based on fence height, design, location, and tradie rates.

When comparing installation costs, Colorbond fencing generally ranges from $90 to $150 per metre, including both materials and labour. It’s considered a low-maintenance option and can last anywhere from 20 to 30 years with minimal upkeep. On the other hand, timber fencing tends to be slightly cheaper upfront, with costs typically falling between $70 and $120 per metre. However, timber requires medium to high ongoing maintenance, including regular sealing or painting, and usually has a shorter lifespan of around 10 to 15 years.

Keep in mind: These prices can vary depending on factors like job complexity, property access, fence height, and local tradie rates.

Which Fence Is Cheaper in the Long Run?

While timber fences are often cheaper to install initially, they typically require more ongoing maintenance, such as painting, sealing, and repair from rot or termite damage.

Colorbond fencing, although a higher upfront investment, may offer better long-term value thanks to its low maintenance needs and longer lifespan.

Factors That Impact Fence Installation Cost

Regardless of the material, your final installation cost can be influenced by:

Fence height & length
Sloped or uneven land
Removal of old fencing
Access to the site
Permits or council regulations

Still Unsure? Use a Fencing Cost Calculator

If you're planning a fencing project and need a rough estimate tailored to your location and fence type, tools like the ServiceTasker™ Fencing Cost Calculator can help you budget accurately. These online calculators allow you to compare Colorbond vs. timber costs based on current market rates in your area — without needing to contact a tradie first.

Final Verdict: Which Fence Should You Choose?

Choose Colorbond If:

You want a modern, clean look
You prefer low-maintenance fencing
You live in a fire-prone or coastal area
You're okay with paying a bit more upfront

Choose Timber If:

You want a natural aesthetic
You're working with a tight upfront budget
You’re comfortable with regular upkeep
You're planning to replace the fence in under 10 years

Final Thoughts

Choosing between Colorbond and timber fencing comes down to budget, style preferences, and long-term plans for your property. While timber may seem like the more affordable option at first glance, don’t forget to factor in the ongoing maintenance costs and lifespan.

For homeowners wanting to make an informed decision, using tools like the ServiceTasker Fencing Cost Calculator can offer practical insights based on real data, helping you avoid surprises and plan your fencing project with confidence.

How Do Reviews Work on ServiceTasker™?

Anurag Seervi — Tue, 22 Jul 2025 12:13:41 +0000

`Reviews have the power to make or break a business in today's digitally first service environment. Especially, it is evident in the trades and home services sectors. Customer reviews are a fundamental part of ServiceTasker™. You can find reviews on ServiceTasker extracted from Google, GMBs, Facebook, and directly posted by customers.

It’s necessary whether you're a customer looking for a trustworthy service provider or a tradesman trying to build a reputation. You can have a better idea of your business if you analyse the market review efficiently.

Why Reviews Matter on ServiceTasker™

For Customers:

Transparency: Reviews offer authentic comments from actual clients who have previously employed a tradie.
Satisfaction: You can assess a tradesman's professionalism, communication, timeliness, and craftsmanship.
Hiring confidence: Customers are reassured that they are making the right decision when they see numerous 5-star reviews with thorough comments.

For Tradies:

Fosters trust: Businesses with solid, recurring reviews have more chances to be hired by new clients.
Improves your visibility: Your visibility in search results can be improved with more positive reviews.
Boosts employment prospects: Vetted, highly regarded contractors receive more requests to quote or accept jobs.

How the Review Process Works – Step by Step

Both the client & the tradesman can submit a review after completion of the task. The usual procedure is as follows:

Step 1: Finishing the Work

The tradesman marks the job as finished on the dashboard or app after completing it. This initiates the review window and notifies the customer.

Step 2: Examine The Sent Request

The customer is automatically prompted by ServiceTasker™ to submit a review. A review can also be left by the tradie.

Step 3: The Client Sends In A Review

The following criteria are used to ask the customer to rate their experience:

Overall satisfaction (1 to 5 stars)
Written feedback (optional but encouraged)
They can mention specific aspects like:
Punctuality
Communication
Cleanliness
Value for money
Quality of work

This multi-dimensional feedback system helps future clients get a fuller picture of what to expect.

Step 4: Tradie Responds (Optional)

The tradie has the following opportunity after the review is posted.
Thank the customer publicly.
Clarify any issues.
Address concerns or provide context.
This helps maintain professionalism and shows responsiveness.

Step 5: Review Goes Live on Profile

The review is linked to the finished job posting and can be found on the tradie's public profile. Future customers can then confirm that the review is connected to a real service.

Understanding the Star Rating System

The highest score on the 5-star system used by ServiceTasker™ is 5. The following summarises the general meaning of the stars:

5 Star – Excellent: Exceeded expectations; flawless work
4 Star – Good: A great experience with minor issues
3 Star– Average: Job was done, but lacked in some areas
2 Star– Poor: Several problems; wouldn’t rehire
1 Star – Terrible: Major issues; dissatisfied or unsafe experience

Each tradie’s overall rating is an average of their most recent reviews (often the last 20–50 jobs).

How to Leave a Great Review (For Customers)

When you’re leaving a review, your feedback helps the entire ServiceTasker™ community. A good review should include:

A clear summary of the work done
What stood out—communication, quality, etc.
Any small issues or areas for improvement (if relevant)
Whether you’d hire them again

Example:

“Daniel fixed a broken light switch and installed three ceiling fans. He was responsible for his work and cleaned up after himself. And he also gave a thorough explanation of everything. He has done good work; highly recommended!”

Can You Edit or Remove a Review?

Yes, but only in specific circumstances.

If something changes or if there was a misunderstanding, customers can ask to have their review updated.
If tradies think a review is against ServiceTasker™'s rules, they can ask for it to be re-evaluated.

The moderation team of ServiceTasker™ will examine the review that has been flagged and take appropriate action. Only reviews that violate the platform's policies are eliminated, maintaining a balance between integrity and fairness.

What If You Get a Negative Review?

If you receive a less-than-ideal review, it can be disheartening, but it's a necessary part of doing business. Here's how to do it professionally

Don't freak out

Your profile won't be ruined by a single bad review, especially if you have a lot of good ones.

React Calmly

Thank the client, acknowledge the feedback, and provide an explanation if necessary. Don't come across as defensive.

For instance: "Shelly, I appreciate your input. I apologise; the misaligned wall studs caused delays, which is why the job took longer than anticipated. I appreciate your candour and promise to do better.”

Acquire Knowledge and Develop

You should use the feedback from reviews to enhance your procedures if a theme emerges, such as tardiness.

Counterbalance It with Additional Reviews

The impact of a single 3-star review can be swiftly diminished by a few new 5-star reviews.

How Tradies Can Get More Positive Reviews

If you want to create a review profile that is glowing, you should try these strategies:

Provide Outstanding Service

Always be the best by being on time, courteous, tidy, and professional.
Communicate Clearly
You should inform clients prior to, during, and following the job.

Request Reviews

You should never hesitate to ask the client to write the review after the task is done. For instance, "If you're satisfied with the work, I'd appreciate you left a review on ServiceTasker™," you could say. It helps me!

Continue

You can gently remind them to leave a review with a brief follow-up message a few days after the job.

Are Reviews on ServiceTasker™ Verified?

Indeed. Reviews can only be written by users who use the platform to book and finish a job. This prevents spam and guarantees authenticity. The reviews shown from GMBs or Facebook are also from verified users only. Anonymous users are not allowed to leave a review on ServiceTasker. A user must verify their phone and email through OTP to be a genuine customer and be eligible to leave a review for a completed task.

ServiceTasker™ upholds a strict criterion for user feedback, in contrast to open marketplaces where anybody can post anything. Each review is linked to an actual, finished project.