Web Application Development

Web Apps That Feel Native,
Score 95+ on Lighthouse, and Scale to Millions.

From SaaS dashboards and multi-tenant portals to PWAs and exec analytics suites. We engineer web apps using modern stacks (Next.js, Vue, Node, Python) with accessibility, performance and SEO built in from line one.

WCAG AA accessible 95+ Lighthouse SEO-first SSR Edge-deployable
72Web Apps Shipped
2.1MDaily Active Users
97Avg Lighthouse
240msAvg TTFB
What We Build

Six Kinds of Web Apps
We've Shipped in the Last 18 Months

Not every web app is the same. We pick the stack and architecture for your specific shape, not a one-size template.

SaaS Dashboards

Onboarding, billing, RBAC, charting, exports, white-labeling. Multi-tenant from day one with audit logs and admin god-mode.

  • Multi-tenant data isolation
  • Subscription & metered billing
  • RBAC with org-tree awareness
  • Per-tenant theming & domains

Portals & Self-Service

Customer, vendor, partner and student portals. Authenticated experiences with workflows, uploads, payments and audit trails.

  • Customer & vendor portals
  • Document workflows & e-sign
  • Payments & invoices
  • WhatsApp & email notifications

Analytics & BI Front-ends

Fast, interactive dashboards on top of ClickHouse, BigQuery and Postgres. From exec scorecards to drillable revenue cohorts.

  • Sub-second query latency
  • Cohort & funnel analysis
  • CSV / Excel / PDF exports
  • Scheduled reports & alerts

PWAs & Offline-First

Web apps that install like native, work offline and sync when the connection returns. For field ops, sales reps and education.

  • Service worker & manifest
  • IndexedDB / SQLite sync
  • Push notifications
  • Background sync & queue

Ecommerce & Headless Storefronts

Headless commerce on Shopify, Medusa or custom stacks. Lightning-fast PLPs and PDPs with SEO and Core Web Vitals first.

  • Headless Shopify / Medusa
  • PDP / PLP at <1s LCP
  • Schema markup baked in
  • Multi-currency & multi-warehouse

Internal Admin & CRUD Tools

The unsexy software that keeps your ops, support and finance teams from drowning in CSVs. Custom-built, not Retool.

  • Bulk action & CSV import/export
  • Approval workflows
  • Custom reporting & views
  • Activity logs & impersonation
Stack

The Web Stack We Ship Production On

Modern, proven, hire-able. Your in-house team will be able to pick up exactly where we left off.

Frontend Frameworks

React 19 Next.js 15 Vue 3 Nuxt 3 SvelteKit Astro Remix

UI, Styling & State

Tailwind CSS shadcn/ui Radix UI Framer Motion TanStack Query Zustand & Redux tRPC

Backend & Data

Node.js + NestJS Python FastAPI & Django Go Laravel Postgres + Prisma Drizzle ORM Redis Hasura / Postgraphile

Hosting & Edge

Vercel Cloudflare Workers AWS ECS / Lambda Fly.io Railway & Render
Performance, Accessibility, SEO

Three Things We Refuse to Ship Without

Non-negotiable 01

<1s
Largest Contentful Paint on a 4G connection.
  • Code-splitting and tree-shaking
  • Image CDN with AVIF/WebP
  • Edge-cached SSR / ISR
  • Lazy loading and route prefetch

Page Speed Is a Conversion Lever, Not a Vanity Metric

For every 100ms shaved off LCP, ecommerce checkout rates rise measurably. We treat Core Web Vitals as a budget, set targets in week 1 and gate every release on them.

  • LCP under 1.5s on 4G, p75
  • CLS under 0.05, p75
  • INP under 200ms, p75
  • Lighthouse 95+ in CI

Non-negotiable 02

WCAG AA
Accessible by construction, not as a post-launch audit.
  • Semantic HTML & ARIA where needed
  • Keyboard navigation on every flow
  • Screen reader tested (NVDA, VoiceOver)
  • Color-contrast checked in design

Accessible Apps Win Bigger Markets and Fewer Lawsuits

Accessibility isn't a checklist, it's a craft decision baked into design and engineering from day one. Our developers ship with screen readers running.

  • WCAG 2.2 AA conformance target
  • Tab order, focus rings and skip links by default
  • Forms with labelled inputs and error states
  • Section 508 / EN 301 549 compliance available

Non-negotiable 03

SEO
SSR, structured data and clean URLs from the start.
  • SSR / SSG / ISR per page type
  • Schema.org markup built into components
  • Open Graph & Twitter cards
  • Sitemap.xml & robots.txt

SEO Built In, Not Bolted On Later

Spacemen also runs an SEO and GEO/AEO agency, so we ship web apps that crawlers and LLMs can actually read. No JS-only blank pages, no missing OG tags, no React 404s.

  • Server-rendered HTML for crawlers
  • Schema.org for Articles, Products, FAQ
  • Open Graph and Twitter card defaults
  • Optimised for ChatGPT & Perplexity citation
Process

How We Build A Web App in 5 Phases

01
Week 1

Discovery & Wireframes

Workshops, user interviews, competitor teardown, low-fi wireframes. Output: a Product Definition Doc and a flow map.

02
Week 2

Architecture & Design System

Stack decision, hosting topology, ER model, API contract, and a typographic + colour design system with reusable components.

03
Week 3 onwards

Sprint Cycles

Two-week sprints with mid-sprint check-in and end-of-sprint demo. Working software on real data, deployed to staging on every merge.

04
Final 2 weeks

Hardening & QA

Performance budgets, accessibility audit, OWASP review, cross-browser test, load test, content QA, copy review.

05
Launch week

Launch & Handover

Production rollout, DNS cutover, monitoring on, runbook delivered, post-launch hyper-care window for 30 days.

FAQ

Web Application FAQs

Default: Next.js for product apps that need SEO, SSR and edge deployment. Vue/Nuxt when your in-house team is Vue-fluent. SvelteKit for content-heavy marketing apps. We pick what your team can hire for and what the app actually needs, not whatever is hyped this quarter.

A tight MVP (auth, 3 to 5 core flows, admin) ships in 8 to 12 weeks. A multi-tenant SaaS with billing, RBAC and analytics takes 14 to 22 weeks. We can stagger releases so you launch a beta at week 8 even on the larger builds.

Tight MVP: $18,000 to $42,000. Mid-size SaaS web app: $45,000 to $110,000. Large multi-tenant platform with billing, analytics, mobile companion: $120,000 to $300,000+. Fixed-bid or T&M, milestone-billed.

Both. We have product designers on the team who build clickable Figma prototypes, a design system and the marketing site. If you already have an in-house designer, we work alongside them and ship from their Figma directly.

Yes, mobile-first responsive by default, plus PWA support if installation is important. If you need a true native app, see our Mobile App Development service, we can run both teams in parallel sharing the same API.

Your GitHub or GitLab organisation, from day one. Branch protections, code review, CI gates and security scans configured before the first feature lands.

Let's Build

A Web App Your Users
Don't Want to Close

Book a 30-minute call. We'll talk stack, scope, timeline and price within 48 hours.