High Level App Developer
Lago • Serbia
Posted: January 19, 2026
Job Description
Location: Remote
Role Type: Contract-to-Hire or Project-Based
Project: Custom HighLevel Marketplace App for Back Nine Golf
We are hiring an experienced application developer for one of Lago’s partner clients. You will architect, build, and deploy a custom HighLevel Marketplace App that syncs golfer, membership, booking, and financial data across their entire network. This is a hands-on role working with leadership, engineering, and operations to turn disconnected systems into a clean and automated platform.
What You Will Build
You will architect, develop, and deploy a custom HighLevel marketplace app that integrates:
1. Sync Core Systems With HighLevel
Build secure authentication, two-way sync, and automated creation of new franchise sub-accounts based on master data.
2. Sync Membership Data
Pull and map active memberships, levels, statuses, custom fields, history, and recurring revenue data for every golfer.
3. Integrate Full Swing Data
Authenticate with Full Swing, pull golfer profiles and performance data, and map everything into the correct contact or custom fields in HighLevel.
4. Sync Revenue and Financial Metrics
Pull and push revenue, transactions, upsells, promo use, and any KPI data needed for dashboards and automation.
5. Sync Tee Times and Bookings
Sync all bookings, cancellations, reschedules, confirmations, and attendance between the booking engine and HighLevel in real time.
6. Sync Forms and Lead Activity
Pull form submissions, create or update contacts, and map fields and tags into the correct sub-account.
7. Support a Multi Location Franchise Model
Assign data to the right franchise sub-account, keep data separated, and support proper versioning for a Marketplace app.
Responsibilities
- Architect and maintain the data model for all integrations
- Build backend logic connecting HighLevel, Back Nine, and Full Swing APIs
- Implement real-time sync, error handling, and data integrity safeguards
- Develop scalable provisioning for new franchises
- Document the full integration for deployment and future development
- Communicate progress clearly with all stakeholders
Technical
- Proven experience building HighLevel Marketplace apps
- Deep knowledge of HighLevel API v2, OAuth, scopes, and app publishing
- Strong backend engineering skills (Node.js preferred)
- Experience with complex third-party API integrations
- Familiarity with multi-tenant, franchise, or distributed systems
- Strong understanding of webhooks, sync queues, and logging systems
- Excellent database and data mapping skills
Bonus
- Experience with Full Swing API or similar sports/performance tracking systems
- Experience connecting SaaS apps into HighLevel
- Stripe or subscription billing integrations
- Background in golf or sports tech
Success Criteria
- Within the first 30 to 90 days, you will:
- Deliver a working version of the Back Nine → HighLevel sync
- Integrate Full Swing data into HighLevel cleanly and reliably
- Achieve full membership, booking, and form submission sync
- Implement revenue reporting and KPI metrics in HL
- Prepare the app for Marketplace submission if needed
Additional Content
Location: Remote
Role Type: Contract-to-Hire or Project-Based
Project: Custom HighLevel Marketplace App for Back Nine Golf
We are hiring an experienced application developer for one of Lago’s partner clients. You will architect, build, and deploy a custom HighLevel Marketplace App that syncs golfer, membership, booking, and financial data across their entire network. This is a hands-on role working with leadership, engineering, and operations to turn disconnected systems into a clean and automated platform.
What You Will Build
You will architect, develop, and deploy a custom HighLevel marketplace app that integrates:
1. Sync Core Systems With HighLevel
Build secure authentication, two-way sync, and automated creation of new franchise sub-accounts based on master data.
2. Sync Membership Data
Pull and map active memberships, levels, statuses, custom fields, history, and recurring revenue data for every golfer.
3. Integrate Full Swing Data
Authenticate with Full Swing, pull golfer profiles and performance data, and map everything into the correct contact or custom fields in HighLevel.
4. Sync Revenue and Financial Metrics
Pull and push revenue, transactions, upsells, promo use, and any KPI data needed for dashboards and automation.
5. Sync Tee Times and Bookings
Sync all bookings, cancellations, reschedules, confirmations, and attendance between the booking engine and HighLevel in real time.
6. Sync Forms and Lead Activity
Pull form submissions, create or update contacts, and map fields and tags into the correct sub-account.
7. Support a Multi Location Franchise Model
Assign data to the right franchise sub-account, keep data separated, and support proper versioning for a Marketplace app.
Responsibilities
- Architect and maintain the data model for all integrations
- Build backend logic connecting HighLevel, Back Nine, and Full Swing APIs
- Implement real-time sync, error handling, and data integrity safeguards
- Develop scalable provisioning for new franchises
- Document the full integration for deployment and future development
- Communicate progress clearly with all stakeholders
Technical
- Proven experience building HighLevel Marketplace apps
- Deep knowledge of HighLevel API v2, OAuth, scopes, and app publishing
- Strong backend engineering skills (Node.js preferred)
- Experience with complex third-party API integrations
- Familiarity with multi-tenant, franchise, or distributed systems
- Strong understanding of webhooks, sync queues, and logging systems
- Excellent database and data mapping skills
Bonus
- Experience with Full Swing API or similar sports/performance tracking systems
- Experience connecting SaaS apps into HighLevel
- Stripe or subscription billing integrations
- Background in golf or sports tech
Success Criteria
- Within the first 30 to 90 days, you will:
- Deliver a working version of the Back Nine → HighLevel sync
- Integrate Full Swing data into HighLevel cleanly and reliably
- Achieve full membership, booking, and form submission sync
- Implement revenue reporting and KPI metrics in HL
- Prepare the app for Marketplace submission if needed