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Next.js

A production framework that would best serve the business model

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Next.js by Vercel - The React Framework Production grade React applications that scale. The world's leading companies use Next.js by Vercel to build static and dynamic websites and web applications. nextjs.org⁠

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WHY NEXT?

SSR - dashboard/admin interfaces with server-side rendering

Server-Side Rendering is development technique where content is generated on the server first, then sent to the user's browser offering faster initial loads.

Client-Side Rendering (CSR) which relies heavily on JavaScript to build the page in the browser

** proposal I believe would best support business requirments

** The Framewwork itself can be deployed off vercel and there no vender lock in.

Fulllstack + No Hidden Fees + Mature tooling for business SPA + Excellent DB intigration

Frontend: Next.js + React + Tailwind CSS

Backend: Next.js API Routes

Database: Neon (Postgres) or Turso (SQLite)

Hosting: Vercel

SMS/Voice: Twilio

Auth: Clerk or NextAuth.js

I dont use IDEs or software and this stack can all be done from the command line.

TWILIO APPROACH

Twilio Webhooks → API Routes

/api/twilio/incoming-call SUPABASE DB

/api/twilio/incoming-sms SUPABASE DB

/api/twilio/status-callback SUPABASE DB

Event Triggered Flow

Missed Call → Twilio → Your webhook →

1. Log to DB (interactions table)

2. Trigger auto-SMS (Twilio API)

3. Log follow-up (follow_ups table)

4. Dashboard updates in real-time

Envronmental Variables Twilio / TRIAL ACCOUNT

token generator:

brew tap twilio/brew && brew install twilio

TWILIO_ACCOUNT_SID=ACxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

TWILIO_AUTH_TOKEN=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

TWILIO_PHONE_NUMBER=+12345678901

# production

TWILIO_MESSAGING_SERVICE_SID=MGxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

TWILIO_VERIFY_SERVICE_SID=VAxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

API CALL using curl where -u is the SID : api key

// command line twillio api call to list services

curl -X GET "https://sync.twilio.com/v1/Services?PageSize=100&Page=0" \

-u SK83c9ea5c6485378ba3ee8c1f25e52328:jDagSXEgFpTGljA4egaleYxeC7ByZboU

based on the responce im able to build the endpoints for automation inside the app.

▲ Next.js 16.1.4 (Turbopack)

Route (pages)

┌ ○ /

├ ○ /404

├ ƒ /api/send-followup

├ ƒ /api/twilio/incoming-call

├ ƒ /api/twilio/incoming-sms

├ ƒ /api/twilio/status

├ ƒ /api/user/[id]

├ ƒ /api/users

├ ○ /dashboard

└ ○ /user/[id]

F = SSR Server Side route

so the dash is nearly completly SSR!

COMMAND LINE

npx create-next-app@latest callaback

Would you like to use TypeScript? No / YES

Which linter would you like to use? ESLint / Biome / None

Would you like to use React Compiler? No / Yes

Would you like to use Tailwind CSS? No / Yes

Would you like your code inside a `src/` directory? No / Yes

Would you like to use App Router? (recommended) No / Yes

Would you like to customize the import alias (`@/*` by default)? No / Yes

What import alias would you like configured? @/* YES

Why This Over Zapier + Sheets

Cost: After initial dev, just Twilio + Vercel costs

Speed: Direct DB writes vs Zapier delays

Reliability: No Zapier rate limits or connection breaks

Customization: Full control over business logic

Scalability: Handles way more businesses/leads

DATABASE = SUPABASE

chat_messages

contacts

follow-ups

interactions

leads

notifications

sms metrics

S3 bucket file storage

schema.sql

-- WARNING: This schema is for context only and is not meant to be run.

CREATE TABLE public.chat_messages (

id uuid NOT NULL DEFAULT gen_random_uuid(),

session_id text NOT NULL,

sender_identity text NOT NULL,

message text NOT NULL,

created_at timestamp with time zone DEFAULT now(),

metadata jsonb DEFAULT '{}'::jsonb,

CONSTRAINT chat_messages_pkey PRIMARY KEY (id)

);

CREATE TABLE public.contacts (

id uuid NOT NULL DEFAULT gen_random_uuid(),

name text NOT NULL,

phone text NOT NULL,

email text,

company text,

notes text,

created_at timestamp with time zone DEFAULT now(),

updated_at timestamp with time zone DEFAULT now(),

sms_opt_out boolean DEFAULT false,

tags ARRAY DEFAULT '{}'::text[],

source text,

metadata jsonb DEFAULT '{}'::jsonb,

CONSTRAINT contacts_pkey PRIMARY KEY (id)

);

CREATE TABLE public.follow_ups (

id uuid NOT NULL DEFAULT gen_random_uuid(),

interaction_id uuid,

contact_id uuid,

type text NOT NULL CHECK (type = ANY (ARRAY['auto_sms'::text, 'manual'::text, 'callback'::text, 'email'::text])),

status text NOT NULL DEFAULT 'pending'::text CHECK (status = ANY (ARRAY['pending'::text, 'completed'::text, 'failed'::text])),

message text,

scheduled_for timestamp with time zone,

completed_at timestamp with time zone,

created_at timestamp with time zone DEFAULT now(),

priority text DEFAULT 'medium'::text,

metadata jsonb DEFAULT '{}'::jsonb,

due_date timestamp with time zone,

CONSTRAINT follow_ups_pkey PRIMARY KEY (id),

CONSTRAINT follow_ups_interaction_id_fkey FOREIGN KEY (interaction_id) REFERENCES public.interactions(id),

CONSTRAINT follow_ups_contact_id_fkey FOREIGN KEY (contact_id) REFERENCES public.contacts(id)

);

CREATE TABLE public.interactions (

id uuid NOT NULL DEFAULT gen_random_uuid(),

type text NOT NULL CHECK (type = ANY (ARRAY['call'::text, 'sms'::text])),

direction text NOT NULL CHECK (direction = ANY (ARRAY['inbound'::text, 'outbound'::text])),

from_number text NOT NULL,

to_number text NOT NULL,

status text NOT NULL,

duration integer,

body text,

twilio_sid text,

contact_id uuid,

created_at timestamp with time zone DEFAULT now(),

num_media integer DEFAULT 0,

metadata jsonb DEFAULT '{}'::jsonb,

CONSTRAINT interactions_pkey PRIMARY KEY (id),

CONSTRAINT interactions_contact_id_fkey FOREIGN KEY (contact_id) REFERENCES public.contacts(id)

);

CREATE TABLE public.leads (

id uuid NOT NULL DEFAULT gen_random_uuid(),

contact_id uuid,

title text NOT NULL,

description text,

status text NOT NULL DEFAULT 'new'::text CHECK (status = ANY (ARRAY['new'::text, 'contacted'::text, 'qualified'::text, 'converted'::text, 'lost'::text])),

priority text DEFAULT 'medium'::text CHECK (priority = ANY (ARRAY['low'::text, 'medium'::text, 'high'::text])),

source text,

value numeric,

created_at timestamp with time zone DEFAULT now(),

updated_at timestamp with time zone DEFAULT now(),

CONSTRAINT leads_pkey PRIMARY KEY (id),

CONSTRAINT leads_contact_id_fkey FOREIGN KEY (contact_id) REFERENCES public.contacts(id)

);

CREATE TABLE public.notifications (

id uuid NOT NULL DEFAULT uuid_generate_v4(),

type text NOT NULL,

severity text DEFAULT 'info'::text,

title text NOT NULL,

message text,

metadata jsonb DEFAULT '{}'::jsonb,

read boolean DEFAULT false,

created_at timestamp with time zone DEFAULT now(),

CONSTRAINT notifications_pkey PRIMARY KEY (id)

);

CREATE TABLE public.sms_metrics (

id uuid NOT NULL DEFAULT uuid_generate_v4(),

message_sid text NOT NULL UNIQUE,

status text NOT NULL,

is_delivered boolean DEFAULT false,

is_failed boolean DEFAULT false,

error_code text,

num_segments integer DEFAULT 1,

price numeric,

price_unit text,

delivery_time_ms integer,

created_at timestamp with time zone DEFAULT now(),

CONSTRAINT sms_metrics_pkey PRIMARY KEY (id)

);

ACCOUNT_SID=ONTHE LOGIN PAGE

API_KEY=API KEY SECTION

API_SECRET=THIS API SECRET ONLY SHOWS ONE TIME

SYNC_SERVICE_SID=THIS SID STARTS WITH AN "IS" and is default or one you create

TWILIO_NUMBER=

WEBHOOK INPUTS TO ADD IN TWILIO CONSOLE

** with https://

calls

callaback.com/api/twilio/incoming-call/

SMS

callaback.com/api/twilio/incoming-sms/

sms-send

callaback.com/api/twilio/sms-send/

Fallback

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callaback.com/api/twilio/status-callback/route.ts⁠

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API OVERVIEW

what is working now.

on an incoming call to the toll free number

A contact is created from the phone number

A contact is saved to the DATABASE

The interaction is saved to a seperate table

The interaction is catgorized LEAD, APPT, Callback

A contact is created DASHBOARD

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A contact is saved to the DATABASE

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The interaction is saved to a seperate table

(with its own UUID unique to that exact call)

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The interaction is catgorized LEAD, APPT, Callback

all this happens automatically.

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THIS IS ROCK SOLID DUE TO HOW IT IS BUILT

What this is NOT....”hey GPT Build me an api for twillio”

I imported every single API that twilio supports in postman

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Then Started API calls based on there documentation. so that is why it just works.

EXAMPLE

** it is from a trial account but you can see that it returns every single service the API supports and that is how the APP is built. From mthe inside out.

This call is a Request to list all services

TERMINAL using Curl

curl -X GET "https://sync.twilio.com/v1/Services?PageSize=100&Page=0" \

-u SK83c9ea5c6485378ba3ee8c1f25e52328:jDagSXEgFpTGljA4egaleYxeC7ByZboU

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And it returns all services GET HTTP /200 OK

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Almost every route is SSR

Route (app)

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