XenneX/LLC
/ services/web application

Web applications built
to scale from day one.

We design the data model, API layer, and frontend in concert — so you don't inherit the technical debt that comes from building those pieces in isolation. From auth and billing to deployment pipelines, we own the full stack.

$8k – $130k depending on scope·6–16 weeks typical

/ what's included

What we cover.

  • Full-stack TypeScript with React / Next.js
  • REST and GraphQL API design
  • Database architecture (PostgreSQL, DynamoDB, Redis)
  • Auth, billing, and notification systems
  • CI/CD pipelines and cloud deployment
  • Performance monitoring and observability

/ deliverables

What you leave with.

  • Production codebase with test coverage
  • Cloud infrastructure (AWS / GCP / Azure)
  • API documentation
  • Architecture decision records

/ process

How we approach it.

01

Architecture & data model

Before a line of production code is written, we define the data model, API surface, auth strategy, and deployment approach. This is where most projects either succeed or set themselves up for pain later.

02

Iterative build

We build in short cycles with working software at each checkpoint. Not a waterfall — you see progress, give feedback, and we adjust. The spec always evolves.

03

Infrastructure & security

Auth, roles, billing, rate limiting, error tracking, and deployment pipelines. The parts that feel boring until something breaks in production. We don't skip them.

04

Testing & launch

End-to-end testing, performance profiling, and a staged rollout. We don't hand off with a big-bang deploy to production.

05

Handoff or ongoing

Clean documentation and architecture decision records so any engineer can pick it up. Or we stay on as your team scales — your call.

/ stack

Tools we reach for in web application engagements.

TypeScriptReactNext.jsNode.jsPythonPostgreSQLRedisDynamoDBStripeAWSVercelDocker

/ fit

Right fit.

This engagement works well when…

  • You need users to log in, create, read, update, or delete data
  • You're building a product that needs to grow, be maintained, and handle real load
  • You need architecture decisions made before code is written, not discovered during QA

Might not be the right fit if…

  • You need primarily static, content-driven pages — a website is a better fit and a fraction of the cost
  • You need a mobile app — we build those too, but it's a separate engagement

/ faq

Common questions.

How long does a web application take to build?+

MVP: 6–10 weeks. Full-featured product: 12–20 weeks. Depends entirely on scope — we define that together before any code is written.

What tech stack do you use?+

TypeScript throughout, React / Next.js on the frontend, Node.js or Python on the backend. Databases chosen to fit the data model — usually PostgreSQL, with Redis for caching and DynamoDB when the access patterns call for it.

Can you take over an existing codebase?+

Yes, though we'll do an honest audit first. If the codebase is in rough shape, we'll tell you — and whether a targeted refactor or a fresh start makes more economic sense.

Do I need to have a design before we start?+

No. We can work from wireframes, existing brand guidelines, or design from scratch. Design is included if you need it.

How do you handle auth and billing?+

We implement auth using established libraries — NextAuth, Clerk, or Auth0 depending on requirements — and billing via Stripe. These are solved problems. We don't reinvent them.

Who owns the code?+

You do. Full source code, deployed to your accounts. You can take it to any team or hosting provider. No vendor lock-in, no ongoing fees owed to us.

/ who it's for

Common clients.

Startups building a SaaS product from scratch
Companies replacing aging internal tools
Teams that need a production web app without a full-time engineering org

Have a project in mind?

Get a ballpark estimate in under 5 minutes — no forms, no sales calls.