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The web application that is your business, or the one that runs it

Whether your web application is the product your customers pay for or the system your team works in every day, it has to be fast, secure, and safe to change for years after launch.
The problem

A web application is easy to start and hard to keep.

Getting a first version onto a screen has never been quicker. The difficulty arrives later: the release that has to serve ten times the users, the security review that lands the week you are busiest, the small change that turns out to touch forty things because nobody drew the seams in the right place. Most of what a web application costs is spent after it launches.

None of that is bad luck. It is the cost of decisions taken early, and we would rather spend an afternoon getting the architecture right now than a fortnight unpicking it in year three.

When the app is your business

In SaaS platform development the application is the thing customers pay for. It has to scale when the sign-ups arrive and stay stable enough that shipping a feature on Tuesday does not break someone's Wednesday. If you are building a product to sell, the multi-tenancy, billing and scale specifics live on our SaaS application development page.

When the app runs your business

In business operations software the application is the system your team lives in all day. When it is down, they are idle, and when the business changes, the software has to change with it. It earns its keep by removing the spreadsheets and the copying between systems that used to hold everything together.

How we work

We build for the version of your business that does not exist yet.

  1. 01

    Shape

    We sit down with the people who will use the thing and map what it has to do, using event storming and story mapping. The architecture follows from the work the application has to support, not from whatever framework is fashionable this year.

  2. 02

    Build

    React and Node.js on a cloud-native AWS foundation. Serverless where the load comes in bursts and containers where it is steady, with an event-driven design where different parts of the business genuinely happen at different times. The whole environment is defined in code with the AWS CDK, so a second copy is a command rather than a week.

  3. 03

    Run

    We stay. Someone has to watch the error rates, keep the dependencies current, and answer the phone when something behaves oddly at four on a Friday. In most of our engagements that is still us years after launch, which is why we build things we are willing to look after.

What's included

What you get, from first sketch to a running platform.

  1. 01

    Architecture that fits the problem

    Serverless, containers, event-driven or a mix, chosen to match your workload rather than a house style. When Rubber Ring's platform needed a rebuild, that meant an event-sourced design with a DynamoDB source of truth streamed into a PostgreSQL read model. Yours might need none of that, and we will say so.

  2. 02

    A modern, accessible front end

    React and TypeScript, built to WCAG standards and quick on the devices people actually hold. The interface is where your users decide whether the software is any good, so it is treated as part of the product rather than a coat of paint.

  3. 03

    Secure by default

    Authentication and authorisation on every request, least-privilege access, validation of anything a user sends, and encryption in transit and at rest. Security is part of the design from the first diagram, not a hardening pass bolted on before launch.

  4. 04

    Built to scale, priced to match

    Serverless components on AWS Lambda scale with demand and cost nothing while idle. Steady workloads run on containers. CloudFront caches what can be cached. We measure before we optimise, and we tell you when a change would buy speed you do not need.

  5. 05

    Infrastructure as code, in your account

    The whole platform is defined with the AWS CDK and runs in your own AWS account. Environments are reproducible, the deploy pipeline is boring by design, and you get a copy of all of it. You can take it elsewhere whenever you like.

“The relationship between us is genuinely a partnership rather than a supplier/customer scenario. They have suggested changes which we would probably never have considered but which have added value.”
Martyn Talbot, Tooling and Equipment Team Leader, Technical Service Operations, Jaguar Land Rover

Web applications businesses run on

A recent build shows the current shape of the work: Rubber Ring's live insurance platform, rebuilt on an event-sourced architecture with a DynamoDB source of truth streamed into a PostgreSQL read model, React on the front, all defined in code with the AWS CDK, and the entire book migrated in a single cutover. We are an AWS Select Tier Services Partner and run a Well-Architected review on every engagement, which is a large part of why the running cost does not surprise anyone in month four.

Read the Cloud Excellence Framework
Questions

The things buyers ask us first.

  • Will we be locked in?

    No. Everything we build runs in your own AWS account, and you get a copy of all of it, including the infrastructure definitions and the deployment pipeline. You can take it elsewhere whenever you want. An engagement that only survives because leaving is painful is not one we want.

  • Can you work with the application we already have?

    Usually, yes. We will read it, tell you honestly what state it is in, and give you the options. Sometimes that is a careful evolution. Sometimes, as with Rubber Ring, it is a rebuild with the live business migrated across in one cutover.

  • Does it have to be React, or a full rewrite?

    No. React is our default for a new front end because it is well supported and we know it deeply, but we work with the stack you have where that is the sensible thing to do. The right answer depends on where you are, not on what we would enjoy building.

  • Who will actually build it?

    The two founders, and the trusted collaborators we bring in around them. No account manager between you and the people writing the code, and no junior learning on your project.

Related

What a web application is built from.

Work we have done for businesses like yours

Golf course
Insurance platform rebuild Published 2026

Rubber Ring

Rubber Ring's digital insurance business had outgrown its original platform.

Discover how we rebuilt it on a modern, event-sourced architecture on AWS - a single-table DynamoDB source of truth streamed into a PostgreSQL read model, with containerised React Router 7 and PHP applications on ECS Fargate - and migrated the entire live book in one cutover.

Rubber Ring logo
Read more: Rubber Ring
Duwio workspace interface
Cloud-native SaaS platform Published 2025

Duwio

Working with Spacesuit Media, we transformed years of experience in image delivery into Duwio - a new SaaS platform for creative professionals, re-engineered from the ground up on AWS.

Built on an AWS well-architected foundation, it enables photographers and agencies to store, tag, search and deliver images seamlessly from anywhere in the world.

Read more: Duwio
GT World racing cars in motion
React Native mobile app Published 2025

SRO Motorsports Group

Si Novi partnered with Whiteflame and SRO Motorsports Group to build a new GT World app, replacing a Europe-only version with one that covers every SRO championship worldwide.

It brings together live video, timing, schedules, team data and race reminders each fan can tune to the series they follow, on a single React Native codebase over a serverless AWS backend.

Read more: SRO Motorsports Group
A package-holiday beach with sun loungers at golden hour
Serverless API rebuild Published 2025

Distribute

Distribute serves package-holiday data to a range of downstream partners through a business-critical API.

Discover how we rebuilt that API as a modern, serverless service on AWS - introducing a clean HTTP/JSON interface while keeping every existing consumer working through a zero-downtime migration.

Distribute logo
Read more: Distribute
Jaguar Land Rover tooling and equipment
Distribution web platform Published 2024

Jaguar Land Rover

Discover how Si Novi partnered with Jaguar Land Rover to build a scalable, secure AWS-powered web application for global tooling distribution.

Learn about the innovative solution, including recent enhancements for electric vehicle tooling, that supports 13 languages and over 40 regions worldwide.

Read more: Jaguar Land Rover
All case studies