Custom Web Application Development
We build web applications for companies that have outgrown a template. Internal tools, customer portals, SaaS products, commerce platforms — software with real users, real data and a real cost when it goes down.
Every project starts with the constraints that actually matter: how fast it must load, how many people will use it at once, what it has to integrate with, and who maintains it after we hand it over.
What We Deliver
The work this engagement actually covers — and what you own at the end of it.
Custom Web Applications
Bespoke applications built around your workflow instead of bending your workflow around off-the-shelf software. Role-based access, audit trails and reporting included as standard.
SaaS Platform Engineering
Multi-tenant architecture, subscription billing, usage metering and onboarding flows — the parts of a SaaS product that are tedious to get right and expensive to get wrong.
API & Systems Integration
REST and GraphQL APIs that connect your new application to the ERP, CRM, payment gateway and legacy database it has to live alongside.
Performance Engineering
Server-side rendering, edge caching, image pipelines and bundle discipline, measured against Core Web Vitals rather than a developer laptop.
Legacy Modernisation
Incremental migration of ageing AngularJS, PHP or .NET Framework applications — strangler-fig style, so the business keeps running throughout.
Accessibility & Compliance
WCAG 2.2 AA conformance built in from the first component, not retrofitted after a procurement questionnaire asks for it.
What you receive
- Production application deployed to your cloud account
- Source code and CI/CD pipelines in your Git organisation
- Architecture decision records and API documentation
- Automated test suite with the critical paths covered
- Lighthouse and Core Web Vitals report at handover
- Runbook covering deploys, rollbacks and monitoring
How the Work Runs
No stage is a surprise, and every one of them ends in something you can look at.
Discovery & Architecture
We map the users, the data and the integrations, then agree an architecture and a delivery plan you can hold us to.
Design & Prototype
Interface design and a clickable prototype of the core flows, so disagreements surface in Figma rather than in code review.
Iterative Build
Two-week sprints with a working demo at the end of each. You see the real application throughout, never a status document about it.
Hardening & Launch
Load testing, security review, accessibility audit and a rehearsed deployment. We launch during your quiet hours, not ours.
Support & Iterate
Thirty days of complimentary support after launch, then a retainer if you want the same team to keep improving it.
What Good Looks Like
These are the targets we design and test against on every web build. Performance is a budget agreed at the start of the project, not a number discovered at the end of it.
Technology We Use
Chosen for what your team can hire for and maintain, not for what is new this quarter.
- React
- Next.js
- Angular
- Vue.js
- TypeScript
- Node.js
- Python
- .NET
- Go
- PostgreSQL
- MongoDB
- Redis
- GraphQL
- Tailwind
Engagement Models
Three ways to work with us. Which one fits depends on how settled your scope is and how long you need the team.
Fixed-Scope Project
A defined outcome, an agreed timeline
We scope the work up front, agree the deliverables and the date, and carry the delivery risk. Best when you know what you need built and want a predictable commitment.
Best for
- A launch with a hard deadline
- A well-understood rebuild or migration
- First projects with a new partner
What's included
- Written scope, milestones and acceptance criteria
- A named project lead and weekly demos
- Fixed delivery date with change control
- 30 days of complimentary post-launch support
Dedicated Team
Our engineers, your roadmap
A ring-fenced team — engineers, designers and QA — working only on your product, in your rituals and your tools. You set the priorities sprint by sprint.
Best for
- Evolving product roadmaps
- Scaling an in-house team quickly
- Long-running platform work
What's included
- Named team members, not a rotating pool
- Your sprint cadence, standups and board
- Direct access to every engineer on the team
- Scale the team up or down at each sprint boundary
Ongoing Retainer
Someone who already knows your system
A monthly block of engineering time for maintenance, security patching, performance work and steady improvement — from the people who built it.
Best for
- Live products that need care, not a rebuild
- Security and dependency upkeep
- Incremental features after launch
What's included
- Essential, Growth and Enterprise tiers
- Monitoring, security patches and dependency updates
- Agreed response times, up to a 24/7 SLA
- Monthly report on what changed and what it cost
Most web applications start as a fixed-scope build and move onto a retainer once they are live and earning.
Related Work
AQNEX E-Commerce Suite
A multi-tenant commerce platform that replaced three disconnected systems — a customer storefront, an admin operations hub and a supplier portal — with one synchronised set of data.
Aquison Jewels
A catalogue site for a fine jewellery maison — thirty pieces across five collections, browsed like a boutique and enquired about over WhatsApp or email. No cart, no prices, no server.
From Our Journal
TypeScript Best Practices in 2024
From utility types to satisfies operator — the TypeScript patterns that senior engineers swear by for building maintainable, type-safe codebases.
Demystifying WebAssembly (Wasm)
Beyond JavaScript: How WebAssembly is bringing native performance and new languages to the modern web browser.
Web Development Questions
The things prospective clients ask us before committing to this work.
How long does a custom web application take to build?
A focused internal tool or customer portal typically takes 8–12 weeks from kickoff to launch. A multi-tenant SaaS platform with billing, onboarding and integrations usually runs 4–6 months. Aquison Technologies gives you a milestone plan after the discovery phase, before any build commitment is made.
Do we own the source code you write?
Yes, entirely. Code is written in your Git organisation from day one, deployed to your cloud account, and the intellectual property is yours under the contract. There is no proprietary framework you have to keep paying us to maintain.
Which framework will you use for our project?
We default to React with Next.js for applications that need strong SEO and fast first loads, and Angular for large enterprise applications with big internal teams already trained on it. The decision is made during discovery based on your team, your hiring plans and your requirements — not on our preference.
Can you take over an application another agency built?
Yes. We start with a paid technical audit covering code quality, security, dependency health and infrastructure, then give you a written assessment of what to keep, what to refactor and what to rebuild. Plenty of our long-running clients came to us that way.
How do you make sure the application stays fast as it grows?
We agree a performance budget during architecture, enforce it in CI so a regression fails the build, and monitor Core Web Vitals from real user traffic after launch. Caching strategy, database indexing and pagination are designed in at the start rather than added under pressure later.