API-first when clients are diverse. Monolith when one client is all that matters.
API-first architecture separates the backend API from the frontend, allowing multiple clients to consume the same data. Monolithic architecture tightly couples the backend and frontend. For most startups, a monolith ships faster. API-first matters when mobile, third-party integrations, or multiple frontends are part of the plan.
Architecture decision between API-first (separate backend API + frontend) and monolithic (everything together) for a new application
"API-first" means building the backend as a standalone API that any client can consume — the web app, a mobile app, a third-party integration, a partner's system. The backend doesn't know or care about what's consuming it.
A monolith (in this context, a Next.js application) has the frontend and backend colocated. Server components fetch data directly; API routes exist but primarily serve the web client.
The monolith case:
- Faster to build: one codebase, one deployment, one context
- React Server Components in Next.js eliminate most of the client/server data fetching ceremony
- Less infrastructure: one deployment vs. two
- For a web-only application, the separation adds complexity without benefit
The API-first case:
- Mobile app: React Native (or Flutter) needs an API to consume. If the mobile app is in scope, an API is required.
- Third-party integrations: if customers need to pull data from your application via API, you need a stable API
- Multiple frontends: different UIs for different user roles consuming the same data
- Webhooks and automation: if your product needs to push data to external systems
The Next.js middle ground: Next.js API routes act as a backend API when needed. A Next.js application can serve the web frontend AND expose an API consumed by a mobile app. Not a strict monolith, not a pure API-first backend.
Architecture selection that matches the actual client requirements — monolith when one web client is the focus, API-first when mobile or external consumers are part of the product plan
Next.js for web applications (monolith-ish by default). Separate API layer when mobile or external API consumers are in scope.
One honest number to start.
Fixed-scope, fixed-price. The number below is the starting point — final scope is built from your brief.
Architecture selection that matches the actual client requirements — monolith when one web client is the focus, API-first when mobile or external consumers are part of the product plan
Three steps, every time.
The same repeatable engagement on every project. No surprises, no mystery, no billable ambiguity.
Brief & discovery.
We send you questions, then get on a call. Output: a written scope with every step, feature, and integration listed.
Build & ship.
Fixed schedule, weekly reviews. No scope creep unless you change the scope — and if you do, we reprice it transparently.
Warranty & retainer.
30-day warranty on every launch. Most clients stay on a monthly retainer for ongoing features and maintenance.
Why Fixed-Price Matters Here
Architecture decisions are made in the scoping phase and are baked into the fixed price.
Questions, answered.
For API-first applications: yes, starting with the API's data model and endpoints before building UI is efficient. For web-first applications, building iteratively (data model + UI together) is faster.
Contentful, Sanity, and Payload are headless CMS tools — backend content APIs with no prescribed frontend. This is API-first for content management. Separate from the application's own data API.
Tell Ryel about your project.
Describe what you’re building and what outcome you need. You’ll have a written, fixed-price scope within the week.