JavaScript Developer - API Integration for Webflow PCP Claims Site

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Project Overview

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We're launching a claims website built in Webflow. The design and front-end are complete - we need a JavaScript developer to add API integrations, tracking, and form logic.

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What You'll Be Working With

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• Fully built Webflow site (clean HTML/CSS/structure ready)

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• Multi-step form UI already designed (you add the logic)

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• Clear technical spec and API documentation

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Scope of Work

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1. Multi-Step Form Logic

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• Build JavaScript for 5-7 step form progression

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• Form validation on each step

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• Progress bar updates

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• Data persistence across steps (localStorage/session)

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• Error handling and user feedback

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2. API Integrations

• Credit Reference API Integration:*

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• Call to credit reference agency API (Experian/Equifax/TransUnion) - we'll provide API credentials

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• Pass user details (name, DOB, address)

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• Retrieve historic car finance agreements

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• Display results in UI

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• Handle API errors gracefully

• Marketing Platform Integration:*

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• Send form data to Klaviyo/Batch/Customer.io via API

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• Trigger welcome sequences

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• Update contact properties based on eligibility

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3. Tracking & Analytics potential

• Google Tag Manager setup:*

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• GTM container installation

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• Event tracking for each form step

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• Conversion tracking

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• Enhanced ecommerce events (if applicable)

• Google Analytics 4:*

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• GA4 configuration

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• Custom events for key actions

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• Goal/conversion setup

• Facebook Pixel:*

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• Pixel installation

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• Standard events (PageView, Lead, CompleteRegistration)

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• Custom conversions

• Google Ads Conversion Tracking:*

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• Conversion actions setup

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• Enhanced conversions implementation

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4. Performance & Security

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• Minify and optimize JavaScript

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• Secure API key handling (environment variables/backend proxy)

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• Rate limiting on API calls

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• GDPR-compliant cookie consent integration

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• Form spam protection (reCAPTCHA or similar)

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5. Testing & Documentation

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• Cross-browser testing (Chrome, Safari, Firefox, Edge)

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• Mobile responsiveness testing

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• API error scenario testing

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• Code documentation and handover notes

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• Brief training video/doc for our team

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Technical Requirements

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• Clean, maintainable JavaScript (ES6+)

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• No heavy frameworks unless justified (vanilla JS or lightweight libs preferred)

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• Must work within Webflow's custom code environment

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• Mobile-first approach

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• Page speed optimization (target: under 1s load time)

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Deliverables

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1. Functional multi-step form with all API integrations

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1. Complete tracking setup (GTM, GA4, Meta Pixel, Google Ads) optional

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1. Documented code with inline comments

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1. Testing report showing all scenarios covered

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1. Handover documentation for maintenance

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1. 2 weeks post-launch support for bug fixes

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Ideal Candidate

• Must have:*

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• 3+ years JavaScript development experience

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• Experience with RESTful API integrations

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• Experience working with Webflow custom code

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• GTM/GA4 implementation experience

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• Portfolio showing similar API integration projects

• Strong preference for:*

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• Experience with financial/regulated industry projects (GDPR, data handling)

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• Experience with credit reference or data lookup APIs

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• Understanding of lead generation funnel optimization

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• UK-based or strong UK timezone overlap

• Bonus points:*

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• Experience with Klaviyo/Customer.io APIs

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• Understanding of conversion rate optimization

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• Node.js/backend experience (if we need proxy endpoints)

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What We Provide

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• Complete Webflow site ready for development

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• API documentation and credentials

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• GTM/GA4/Pixel account access

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• Clear functional requirements document

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• Responsive project management via Slack/email

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Budget & Timeline

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• Budget: $500 (fixed price, depending on experience)

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• Timeline: 2 DAYS from kickoff to completion

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• Payment milestones:

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• 30% on start

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• 40% on API integration completion

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• 30% on final delivery + testing sign-off

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To Apply

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Please include:

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1. Portfolio with 2-3 relevant API integration projects

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1. Any Webflow custom code projects you've worked on

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1. Your approach to securing API keys in client-side code

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1. Experience with GTM/GA4 implementation (examples)

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1. Your timeline and exact rate for this scope

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1. Confirmation you can provide 2 weeks post-launch support

• Start your proposal with "API INTEGRATION READY"* so I know you've read this brief.

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We're looking for someone detail-oriented who can deliver production-ready code that won't break under high traffic.

• Pass user details (name, DOB, address)
• Update contact properties based on eligibility
• Minify and optimize JavaScript
• Secure API key handling (environment variables/backend proxy)
• GDPR-compliant cookie consent integration
• Form spam protection (reCAPTCHA or similar)
• Cross-browser testing (Chrome, Safari, Firefox, Edge)
• Clean, maintainable JavaScript (ES6+)
• Must work within Webflow's custom code environment
• Must have:*
• 3+ years JavaScript development experience
• Experience with RESTful API integrations
• Experience working with Webflow custom code
• GTM/GA4 implementation experience
• Portfolio showing similar API integration projects
• Strong preference for:
• Experience with financial/regulated industry projects (GDPR, data handling)
• Experience with credit reference or data lookup APIs
• Understanding of lead generation funnel optimization
• UK-based or strong UK timezone overlap
• Experience with Klaviyo/Customer.io APIs
• Understanding of conversion rate optimization
• Node.js/backend experience (if we need proxy endpoints)
• GTM/GA4/Pixel account access
• Clear functional requirements document
• 30% on final delivery + testing sign-off
• Portfolio with 2-3 relevant API integration projects
• Your approach to securing API keys in client-side code
• Experience with GTM/GA4 implementation (examples)
• We're looking for someone detail-oriented who can deliver production-ready code that won't break under high traffic

• Trigger welcome sequences
• Complete Webflow site ready for development
• Responsive project management via Slack/email
• Budget: $500 (fixed price, depending on experience)
• Timeline: 2 DAYS from kickoff to completion

• The design and front-end are complete - we need a JavaScript developer to add API integrations, tracking, and form logic
• Fully built Webflow site (clean HTML/CSS/structure ready)
• Multi-step form UI already designed (you add the logic)
• Clear technical spec and API documentation
• Multi-Step Form Logic
• Build JavaScript for 5-7 step form progression
• Form validation on each step
• Progress bar updates
• Data persistence across steps (local
• Error handling and user feedback
• Display results in UI
• Handle API errors gracefully
• Marketing Platform Integration:
• Send form data to Klaviyo/Batch/Customer.io via API
• Tracking & Analytics potential
• GTM container installation
• Event tracking for each form step
• Conversion tracking
• Enhanced ecommerce events (if applicable)
• Google Analytics 4:*
• Custom events for key actions
• Standard events (PageView, Lead, CompleteRegistration)
• Custom conversions
• Google Ads Conversion Tracking:*
• Enhanced conversions implementation
• Rate limiting on API calls
• Mobile responsiveness testing
• API error scenario testing
• Code documentation and handover notes
• Brief training video/doc for our team
• Mobile-first approach
• Page speed optimization (target: under 1s load time)
• Functional multi-step form with all API integrations
• Complete tracking setup (GTM, GA4, Meta Pixel, Google Ads) optional
• Documented code with inline comments
• Testing report showing all scenarios covered
• Handover documentation for maintenance
• 2 weeks post-launch support for bug fixes
• Any Webflow custom code projects you've worked on