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Custom Web Application Development

Custom Web Application Development — illustrative product visual produced by UnlockLive IT
Quick answer

UnlockLive IT is a Toronto-based custom web application development company shipping full-stack web apps for SaaS, internal tools, dashboards, real-time collaboration, and enterprise portals. Default stack: Next.js 15 + Python/FastAPI on AWS, but we run Django, Laravel, .NET, Vue/Nuxt, Angular, and Go when the project demands it. Since 2008 we've shipped over 1,000 web projects, from internal tools that replace Excel chaos to multi-tenant SaaS that handles millions of users. Every project includes typed API contracts, automated tests, CI/CD, observability, and a Toronto PM accountable for the timeline. If you specifically want Next.js Development, SaaS Development, or Python/FastAPI deep-dives, see those pages.

What we build

Customer-facing web applications:User-facing platforms — dashboards, account portals, configurators, content authoring tools, marketplace UIs. Real-time collaboration, complex state, deep integrations. Built for production traffic from day one.
Internal tools & admin platforms:Operations consoles, support agent tooling, data labeling UIs, custom CMS-es, finance dashboards, ETL/job-monitoring panels. Replaces fragile Retool sprawl and Excel-based workflows with maintainable apps.
Enterprise portals & extranets:Customer portals, partner extranets, vendor onboarding, broker dashboards, member portals — with SSO (SAML, OIDC, Okta, Entra ID), role-based access, audit logging, and integration to your existing systems.
Real-time and collaborative apps:Chat, collaboration, dashboards, live editing — using WebSockets, Server-Sent Events, Yjs / Liveblocks, Pusher, Ably, or PartyKit. Latency budgets enforced in CI.
Data-heavy & visualization apps:Analytics dashboards with millions of rows. Server-side aggregation in ClickHouse / DuckDB / BigQuery, virtualized tables (TanStack Table), and chart libraries (Recharts, ECharts, visx, deck.gl for geospatial).
Web app modernization:Migrating off Create React App, AngularJS 1.x, abandoned Vue 2, jQuery monoliths, classic ASP, and end-of-life PHP onto modern Next.js or Django. Phased rewrites with no big-bang risk.

Our web technology stack

Frontend (default): Next.js 15 (App Router, Server Components), TypeScript strict, Tailwind CSS, shadcn/ui, TanStack Query / Table
Frontend (alternates): React + Vite, Remix, Astro for content-heavy, Vue 3 + Nuxt, Angular when the team requires it
Backend: Python + FastAPI, Node.js + Hono / NestJS, Laravel, Django, .NET 8, Go, Ruby on Rails — see our FastAPI page
Database: PostgreSQL (primary), MySQL, MongoDB, Redis, ClickHouse for analytics, pgvector for embeddings
Auth: Clerk, Auth0, WorkOS, Keycloak, Supabase Auth, NextAuth, custom OAuth/SAML/OIDC for enterprise SSO
Real-time: WebSockets (uWebSockets, Socket.io), SSE, Yjs, Liveblocks, Pusher, Ably, Cloudflare Durable Objects
AI integration: OpenAI, Anthropic, Bedrock, LangGraph, Vercel AI SDK — see our AI Agents and RAG pages
Hosting: Vercel, AWS (ECS Fargate / Lambda / EC2), Cloudflare Workers, Azure, GCP, on-prem Kubernetes
Testing: Vitest, Playwright, Cypress, pytest, Storybook, MSW for mocking
Observability: Sentry, Datadog, OpenTelemetry, PostHog, LogRocket, Vercel Analytics

Our web development process

  1. Discovery & UX (1-3 weeks): Stakeholder interviews, jobs-to-be-done mapping, competitor teardown, technical audit (if modernizing), Figma wireframes for key flows, and a written requirements document with prioritized scope.
  2. Architecture (1-2 weeks): System design diagrams, data model, API contracts, hosting topology, security and compliance constraints, and a written ADR per non-obvious decision.
  3. Sprint 0 — foundations (1 week): Repo setup, CI/CD, design system, env config, auth scaffold, observability baseline. Working staging deployment from day one.
  4. Iterative two-week sprints (8-24 weeks): Real Scrum: planning, daily standup, demo, retrospective. Continuous deployment to staging. Weekly written status from your Toronto PM.
  5. QA & launch (2-3 weeks): Full regression, performance audit (Lighthouse 90+), accessibility audit (WCAG 2.1 AA), OWASP Top 10 review, load test, production launch with on-call coverage during cutover.
  6. Post-launch warranty + retainer (ongoing): 30-day warranty included. Most clients move into a monthly retainer (20-160 hrs/month) for feature work, performance, and bug fixes.

Frequently asked questions

What stack do you recommend for a custom web application in 2026?

Our default for new web apps is Next.js 15 (App Router, Server Components) on the frontend, Python/FastAPI or Node/Hono on the backend, PostgreSQL with pgvector, Clerk or WorkOS for auth, deployed on Vercel + AWS (or all-AWS for enterprise). We're equally comfortable in Django, Laravel, .NET, Go, and Rails when the team or use case demands it.

What's the difference between this and your Next.js Development page?

This page is about the broader practice — full-stack custom web applications across multiple frameworks (React, Next.js, Vue, Angular, plus backends). The Next.js Development page is the deep-dive for prospects searching specifically for Next.js work. If you want to know how we deliver web apps end-to-end, you're in the right place. If you want Next.js-specific framework details, see that page.

How much does a custom web application cost?

Internal tools and tight MVPs typically range from $25,000 to $80,000. Production-quality custom web apps (auth, multi-tenant, integrations, ~10-20 core screens) range from $90,000 to $300,000. Enterprise platforms with deep integrations and compliance work start at $250,000.

How long does it take?

Internal tool / tight MVP: 8-14 weeks. Mid-sized custom platform: 4-8 months. Enterprise platform: 9-18 months in multiple releases. We ship a working staging environment in the first 2-3 weeks of every engagement.

Do you handle ongoing maintenance after launch?

Yes. Every project includes a 30-day post-launch warranty, and most clients move into a monthly retainer for ongoing maintenance, security patching, performance work, and feature development. Retainers start at 20 hours/month with on-call availability.

Can you migrate or modernize a legacy web application?

Yes. We routinely migrate legacy PHP, AngularJS 1.x, abandoned Vue 2, classic ASP, Cold Fusion, end-of-life Rails, and Create React App codebases onto modern Next.js or Django. We use the strangler-fig pattern wherever possible to avoid big-bang rewrites — every migration includes an SEO-safe redirect map and side-by-side performance benchmarking.

How do you ensure security and accessibility?

Every project ships with HTTPS, CSP headers, OWASP Top-10 review, automated dependency scanning, and (for client-facing apps) WCAG 2.1 AA accessibility audit. For regulated industries we layer on PCI DSS, HIPAA, SOC 2, or GDPR controls — see our Cybersecurity page for compliance services.

Related case studies — see this in production

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Tell us what you're building or modernizing. Book a free strategy call with our Toronto team — we'll respond within one business day.

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UnlockLive IT Limited provides state-of-the-art software solutions to clients all over the world. We are a creative force with strategic alliances distributed around the globe

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