Web Apps

Custom Web Apps

Custom web apps that load fast, look sharp, and integrate cleanly—built for external products and internal teams. We design the component system, wire up APIs, and ship production-grade UX with strong performance, accessibility, and SEO.

Turn ideas into fast, resilient web apps your team can grow with.

We architect clear routes and information hierarchy, build a reusable component library, connect to your data and auth, and set up CI/CD so every release is safe and repeatable. Performance and accessibility are baked in—not an afterthought.

Teams often struggle with slow pages, template sprawl, and brittle integrations. Common issues include:

  • Laggy pages and low Lighthouse/Core Web Vitals on key flows.
  • Inconsistent UI and duplicated components across sections.
  • Brittle forms and validations; unclear error handling and empty states.
  • Ad-hoc API calls without caching, retries, idempotency, or observability.
  • SEO and metadata misconfigured; social previews look broken.
Next.js app architecture diagram—routes, components, API, and integrations.
A recent custom web app build.

Built for external products and internal teams

External products & portals

  • Conversion-minded UX, SEO-ready routing and metadata.
  • Payments, subscriptions, CRM, analytics, email, webhooks.
  • Role-based access, audit logs, rate limits, abuse protection.

Internal tools & ops apps

  • Admin consoles, workflow automation, data entry at scale.
  • Reliable forms, optimistic updates, offline/latency strategies.
  • SSO (SAML/OIDC), granular permissions, environment controls.
  • Observability: logs, traces, metrics with alerting/runbooks.

Next.js web apps — what’s included

We start with goals, users, and critical paths. Then we prototype, build the component library, wire integrations, and harden performance and accessibility. Launch is followed by a tidy handover and roadmap for iterations.

Practically, that means routes and layouts, typed components, forms and validation, server/client data flows with caching and revalidation, auth, error states, analytics, secure environment management, and CI/CD. We treat integrations as first-class citizens with idempotency, retries, and useful logs.

The result: a fast, accessible app with a maintainable codebase and integrations you can trust.

Fast & accessible

Core Web Vitals-friendly and inclusive by design.

Production-grade

Typed components, CI/CD, and clear error handling.

Integrated

Clean APIs and resilient connections to your tools.

How we deliver

We begin by aligning on goals, users, KPIs, and risks through short workshops. The output is a concise brief, information architecture, and a high-level backlog that focuses effort where it matters most.

Next, we design and prototype the critical paths. We define tokens, assemble a component inventory, and create a clickable prototype so stakeholders can validate flow and content early.

We then build: typed components, clear API contracts, and a data layer with caching and revalidation. Forms are robust, empty and error states are explicit, and accessibility is addressed as we go—not tacked on later.

Before launch, we harden the app with performance and accessibility passes, security checks (including CSP and auth flows), and a pragmatic test suite for smoke and regression coverage.

Finally, we launch with preview environments, a release plan, and observability in place. Handover includes documentation, runbooks, training, and a clear roadmap for the next iteration.

Frequently Asked Questions

How long does a typical build take?
If you're a start-up and you're just trying to get from 0-1, we can typically get you a prototype in as little as 3 weeks. If you already have users, data and you're looking for something a little more comprehensive, get in touch and we'll give you an estimate.
What’s in scope?
Component system and pages, forms, auth, API integration, analytics, performance and accessibility passes, and deployment pipeline.
What stack do you typically use?
Next JS, Tailwind CSS, Vercel, Supabase, MongoDB, Python, are some of the tools we would use if you want to launch quickly.
Will it be SEO-friendly?
Yes. Clean semantics, structured metadata, image optimisation, and fast responses for key pages and previews.
Can you integrate with our tools?
Typically. We can integrate with your CRMs, auth, analytics, billing, and internal APIs.
Do you provide handover?
We document components and workflows, set up environments and CI/CD, and provide runbooks for common tasks.
How do you handle security and compliance?
We follow OWASP best practices, enforce CSP, protect against common web risks, and integrate with your identity provider. For sensitive data, we align to least-privilege, strong secrets management, and audit trails.

Trusted by

  • Woodside
  • BetterLabs
  • Hawaiian
  • Capricorn
  • Visagio
  • Eastcourt
  • Spacecubed
  • Curtin
  • DigitalX
  • DFCRC
  • Labrys
  • IIA Australia
  • Neomi
  • Fableration
  • Prologic
  • Loomi
  • Skimreader
  • IDM
  • Remi
  • Artifai
Kali Software Pty Ltd.
ACN 656 408 678
333 George St, Sydney NSW 2000