Web Application Development Services
Sentia has been a web app development team in Sydney since 2006. We build SaaS products, customer portals, marketplaces and the integrations behind them, and the web applications we've built serve more than 15 million users.
build with Sentia
From idea to shipped. Built to validate early and scale when it counts.
We help you figure out what to build first.
Before a line of code is written, we work through what needs to be in version one: what to validate, what to defer, and what to build first.
A track record in Rails most agencies can't match.
We've been building Ruby on Rails applications in Australia for over twenty years. Airtasker, Shippit, Paylab: the systems we built at startup are still running at scale today.
You always know where your budget is going.
We scope carefully, communicate when things change, and won't build things you don't need. Honest updates on progress and cost throughout.
Web app development services for whatever you're building.
Marketplace platforms, built for both sides.
Build a marketplace that works for buyers and sellers alike. We've built the payment processing, escrow, trust workflows, search, matching, and admin tooling that makes two-sided platforms work at scale.
Explore serviceProcessing, escrow, and split payment flows built for both sides of the market.
Help buyers find what they need and sellers get discovered.
Identity checks, reviews, and verification flows that build confidence.
Dashboards and tools for managing users, listings, and disputes on both sides.
SaaS products, built to grow.
Ship your first version and build toward scale from day one. We build subscription billing, multi-tenant architecture, role-based access, and analytics pipelines into software that supports a growing customer base without rewrites.
See our workOne codebase, one database, many customers.
Plans, trials, upgrades, and payment management built in.
Control who sees what across your customer accounts.
The data pipelines that power your product's reporting features.
Operational platforms that keep things moving.
Replace spreadsheets and manual follow-up with software that actually runs your operations. We build the workflow automation, approval chains, real-time dashboards, and system integrations that keep complex businesses coordinated.
See our workKeep multiple locations and teams working from one system.
Automate the steps and approvals that slow your team down.
See what's happening across your operation as it happens.
Connect the software you already use without rebuilding from scratch.
Consumer applications, built for serious traffic.
Build for where you're going, not just where you are. We architect consumer web applications for scale from day one, covering real-time notifications, live feeds, performance monitoring, and incident response.
See our workArchitecture that handles growth without rewrites.
Notifications, live updates, and feeds that keep users engaged.
Fast, responsive experiences that work on any screen.
Know when something goes wrong before your users do.
Integrations that hold up in production.
Connect the systems your business depends on without duct tape holding it together. We build the integration layer across carrier networks, financial platforms, national health infrastructure, and IoT devices, keeping data flowing reliably.
Explore serviceConnect to carriers, platforms, and services your business depends on.
Integrations with eRx, Medicare, and PBS built to compliance standards.
Connect accounting, invoicing, and enterprise platforms.
Data that moves when events happen, not on a schedule.
What custom web application development actually means.
Software your team and customers use in the browser.
Backed by a database. Think booking systems, marketplaces, client dashboards or the internal tools that run your operations.
Built around how your business works.
Instead of bending your process to fit a subscription product, it connects to the systems you already use and grows as you add users and features. That's what our web application development services are set up for.
Custom when the workarounds cost more.
Off-the-shelf software is often the right call early on. When the workarounds start costing more than the subscription, custom starts to pay for itself. Read about custom software development.
The tech we use.
Frontend
- React
- Hotwire
- Turbo
- Stimulus
- Bootstrap
Backend
- Ruby on Rails
- PostgreSQL
- Sidekiq
- RESTful APIs
Infrastructure
- AWS
- Heroku
- S3
- AWS SES
- SendGrid
- Sentry
- Cloudflare
- Twilio
Payments & Finance
- Stripe
- Airwallex
- PayTo
- Zai
- Xero
Location
- G-NAF / Geoscape
Our work
Airtasker
Industry
On-demand Service, Marketplace
Shippit
Industry
Transport & Logistics, Retail & eCommerce
Paylab
Industry
Financial Services & Fintech, Retail & eCommerce