SaaS App Developer - API Integrations for existing web app (twilio, stripe, Claude ai, google places

I am building a SaaS platform called Rivexa. I need a developer to either connect API integrations to an existing Base44 build or rebuild it from scratch — open to both options. WHAT RIVEXA IS: Rivexa is a all-in-one platform built specifically for marketing agency owners, freelancers, and entrepreneurs who sell websites and automation services to home service businesses like roofers, plumbers, electricians, painters, mobile mechanics, landscapers, and HVAC companies. The idea behind Rivexa is simple. There are thousands of people out there who want to start a marketing agency or freelance business selling websites and automation to local home service businesses. Right now they have to piece together multiple expensive tools to do this — GoHighLevel for automations, separate website builders, different lead generation tools, and various other platforms. It gets expensive, complicated, and hard to manage. Rivexa solves this by putting everything they need into one clean platform: 1. They can use the AI Website Builder to generate a complete professional website for any home service business client in seconds just by describing what they want. The AI writes all the copy, designs the layout, and outputs a fully coded ready to publish website. No coding or design skills needed. 2. They can use the Lead Finder to search for home service businesses in any city that might need a website or marketing help. They can filter by industry, location, rating, and whether the business already has a website. This helps them find prospects to cold call and pitch their services to. 3. They can use the Website Audit tool to instantly generate a professional audit of any lead's existing website showing scores for SEO, mobile, and conversion along with personalized cold call talking points and outreach messages. This gives them something valuable to lead with when they call a prospect. 4. They can use the SMS Automation tools to set up powerful text message automations for their home service business clients including: - Quote Form Text-Back: when a homeowner fills out a quote form on the client's website, they automatically receive a text confirmation - Missed Call Text-Back: when a potential customer calls the business and nobody answers, they automatically receive a text message so the lead is never lost - Follow-Up Text: sends an automatic follow up text 24 hours after a quote form submission to keep the lead warm 5. They can use the Review Funnel to send personalized text messages to their client's recent customers asking them to leave a 5-star Google review. This helps their clients build social proof and rank higher on Google. 6. They can manage all of their clients from one place, tracking which automations are active, which websites have been built, and all SMS activity in a unified inbox. The target user is someone exactly like me. I run a marketing agency selling websites and automations to home service businesses and I built Rivexa because I wanted a single tool that handled everything instead of paying for five different platforms. I plan to sell Rivexa as a subscription starting at $97 per month with a 3-day free trial so other agency owners can use it to run and grow their own businesses. HERE IS WHAT NEEDS TO BE BUILT OR CONNECTED: The current version of Rivexa was built using Base44 which handled the UI, dashboard, and all page layouts. I now need a developer to connect the real API integrations so the features actually work. 1. Claude API — AI Website Builder The website builder page has a text input where users describe a website they want. When they click Generate, it needs to call the Claude API (claude-sonnet-4-6) with a system prompt I will provide, receive the returned HTML, and render it inside an iframe preview on the same page. Users should also be able to type follow up refinements and have the conversation history sent with each request. 2. Google Places API — Lead Finder The Lead Finder page has a search form with fields for industry, city, and state. When the user searches, it needs to call the Google Places Text Search API and return real business results including business name, phone number, address, website, and rating into the results table. 3. Twilio — SMS Automations Three automations need to be connected: - Quote Form Text-Back: when a quote form embedded on a client website is submitted, automatically send an SMS to the customer using a customizable message template - Missed Call Text-Back: set up a Twilio webhook so when a call is missed on the client's Twilio number, an automatic SMS is sent back to the caller - Review Funnel: when the user fills in a customer name and phone number and clicks Send Review Request, send an SMS with a customizable review request message 4. Stripe — Billing and Free Trial Connect the Billing page to Stripe. There are three plans: Starter $97/month, Pro $197/month, Agency $297/month. Each plan needs a 3-day free trial. After the trial expires users should be prompted to enter payment info. Show current plan and trial days remaining on the dashboard. All API keys are entered by the user in the Settings page — nothing should be hardcoded. SKILLS NEEDED: - API integrations (REST APIs) - Twilio - Stripe - Google Places API - Claude or OpenAI API - JavaScript or Node.js - Webhook setup - SaaS development experience PLEASE INCLUDE IN YOUR PROPOSAL: - Your experience with Twilio and Stripe specifically - Examples of similar SaaS projects you have built or integrated - Your estimated timeline to complete all four integrations - Your fixed price quote - Whether you recommend keeping the Base44 build or rebuilding from scratch and why This is a fixed price project, not hourly. Budget is flexible for the right developer. Note: The current version of Rivexa was built using Base44. If you believe you can deliver a better, more scalable result by rebuilding it from scratch using a proper tech stack, I am open to discussing that as well. Please include your recommendation in your proposal along with your reasoning, timeline, and price for both options if applicable."