Full-Stack Development Featured

Full-Stack Web Development

End-to-end web application engineering — from data model and API design through to production UI. We own the full stack and deliver working, documented software with a clear handoff.

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Service Overview

Full-stack development engagements at Nine9Appz are structured around a single guarantee: you receive working, production-deployed software with the documentation to understand, operate, and extend it. No half-finished repos, no undocumented decisions, no hand-wave handoffs.

We work from a written specification. Changes to scope are managed explicitly through a change-order process, not absorbed silently into the timeline.

Application Architecture

Every application we build follows a layered architecture with clear boundaries between concerns:

Frontend Layer

Built with React and TypeScript — typed from component props through to API response shapes. We do not deliver untyped React codebases.

UI is built utility-first with Tailwind CSS. Components are extracted into a documented component library only when there’s genuine reuse — we don’t create abstraction for abstraction’s sake.

API Layer

We build REST APIs with Node.js (Express) as the default. GraphQL is used where the client query requirements are complex and genuinely benefit from a graph model.

API contracts are defined and documented via OpenAPI (REST) or typed resolvers with schema introspection (GraphQL). Every endpoint has a matching integration test.

Data Layer

Schemas are managed via Drizzle ORM with a tracked migration history. We design schemas with future query patterns in mind — normalizing where data integrity matters, denormalizing where read performance is critical.

Database access never happens directly from the frontend layer. All mutations flow through the API.

Authentication

We integrate Clerk for most authentication requirements. It handles multi-tenant organization isolation, social sign-in (Google, GitHub), and session management with minimal surface area on our side of the stack.

Custom JWT flows are implemented for applications with specific compliance requirements or existing identity providers.

Development Process

All full-stack engagements move through this pipeline:

  1. Specification & Discovery — We translate your requirements into a written spec covering user flows, data models, API contracts, and non-functional requirements (expected load, latency targets, compliance constraints). Nothing gets built until the spec is approved.

  2. Architecture Design — Database schema, API route map, component tree diagram, and deployment topology are documented and reviewed before development begins.

  3. Backend First — API endpoints and database schema are built and tested before any UI work starts. This makes frontend development deterministic — the contract is stable.

  4. Frontend Build — UI is built component-by-component against the live staging API. Each view is reviewed against the spec before moving to the next.

  5. Integration & QA — End-to-end test suite is written covering critical user paths. Edge cases identified during QA are tracked and resolved before staging sign-off.

  6. Deployment & Cutover — Production environment is provisioned (often using our cloud infrastructure service), CI/CD is validated, and the application is deployed with monitoring in place.

  7. Handoff — You receive the codebase, deployment credentials, architecture documentation, and a recorded walkthrough of the system. A 14-day bug-fix window is included post-handoff.

What We Don’t Do

  • We don’t build on top of no-code platforms or low-code tools.
  • We don’t deliver frontend-only work without a corresponding API contract.
  • We don’t accept scope changes mid-sprint without a change order.
  • We don’t start development without a signed specification document.

These constraints are not bureaucracy — they are the mechanics that make fixed-price projects deliverable.

Engagement Model

Full-stack engagements are scoped as fixed-price milestones against the written specification. A typical MVP engagement (authenticated web app, 3–5 core features, deployed) takes 4–8 weeks depending on complexity.

Discovery and specification are billed as a standalone engagement (~$1,500) before the main development contract. This protects both sides: you get a clear scope document you could take to any contractor, and we build to a concrete target.