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Web · SaaS, portals, e-commerce

Web Application Development Services

Most web application work is not greenfield. There is a system that still just about works, a spreadsheet quietly holding a department together, or a product that outgrew the platform it was prototyped on. We build the replacement without stopping the business that depends on the original.

What you get

Web Application Development done properly.

Different audiences, different failure modes. What they share is that the interesting problems are behind the interface.

Common failure modes

Where this usually goes wrong.

Named up front, because avoiding them is most of the value.

How we work

The engagement, phase by phase.

Every phase is run by senior engineers and ends in something you can see.

01

Discovery and audit

We read the system you already have — schema, integrations, traffic, and the manual workarounds staff have invented — before proposing anything to replace it.

02

Architecture and access model

Data model, tenancy, roles and integration boundaries agreed and documented, because these are the decisions that are expensive to revisit.

03

Design and prototype

Clickable flows for the journeys that carry the business, tested with the people who will use them daily rather than the people who commissioned the project.

04

Build in vertical slices

Each sprint ships a complete feature, schema through interface, into a staging environment you can log into — so progress is something you use, not a percentage in a report.

05

Migration rehearsal

Extract, transform and load run repeatedly against copies of production until the dress rehearsal is dull. Then the real cutover is staged, timed and reversible.

06

Hardening and handover

Load and security testing, monitoring and alerting, runbooks, then repository and documentation handover to whoever operates it next — us or you.

Proof

Shipped, and still running today.

Four platforms in production. Two of them we still operate.

We make magic happen
with technology.

Let's Talk
Inverge Tech
Technology

What we build it with.

Chosen per project, and for what your team can maintain afterwards.

Node.js Next.js React Angular Vue.js PHP Python C# .NET Java PostgreSQL MySQL MS SQL MongoDB AWS Azure Google Cloud
FAQ

Questions we get asked.

Can you replace a legacy system without downtime?

Usually, by running old and new in parallel and moving traffic across in stages instead of flipping a switch late on a Friday. It costs more in planning and far less in recovery. Where a hard cutover genuinely cannot be avoided, we rehearse it against production copies until the timings are boring.

What happens to our existing data?

It comes with you, and it is normally the longest part of the job. We profile the actual rows early rather than the schema documentation, because that is where the surprises live. Migration scripts are written to be re-runnable, so the real cutover is a repeat of something already done a dozen times.

Do you build SaaS products with multi-tenancy?

Yes. Whether tenants are separated by row, by schema or by database is an early architectural decision with consequences for cost, isolation and every compliance conversation you will later have — so it is decided deliberately and written down. Our post on building scalable SaaS covers the trade-offs.

Will we be able to maintain it ourselves?

That is the intent. Conventional framework choices over clever ones, tests that run in your CI, infrastructure defined as code, and documentation written for the engineer who joins after we have gone. The repositories and cloud accounts are yours throughout, not just at the end.

Can you work alongside our in-house developers?

Yes, and it is often the better arrangement. Team extension puts our engineers inside your process and your repositories; a dedicated team runs delivery while your people stay close to it. Both models are described on our services page.

How much does a web application cost?

Scope, integration count and how much of the requirement is already settled drive it — not a rate card. Our consultation page sets out the six factors that move the number most, and a call turns them into a range for your project.

Also relevant

Other services.

Ready to talk about your web application development?