GolfyApp — Your Golf Coach in Your Pocket

The challenge

Amateur golfers who want to improve their swing have few options: expensive in-person lessons that are hard to schedule, or generic YouTube videos that offer no personalized feedback. GolfyApp needed a platform that connected players with professional instructors asynchronously, enabling personalized video analysis from any golf course.

The main technical challenge: building a complete video pipeline that allowed recording, compressing, uploading, assigning to an instructor, professional annotation and returning to the user — all working smoothly even with the limited mobile coverage typical of golf courses.

Our solution

We developed GolfyApp end-to-end — from backend architecture to native apps for iOS and Android:

End-to-end video pipeline

The most complex system component is the video processing pipeline:

1. Guided capture: the app displays framing guides on screen so the user records their swing from the correct angle (face-on or down-the-line)
2. Smart compression: before uploading, the video is compressed with FFmpeg maintaining the quality needed for analysis while reducing file size for upload in areas with poor coverage
3. Resilient upload: upload system with automatic retry and ability to resume interrupted uploads — essential for the intermittent connectivity of golf courses
4. Automatic assignment: the backend distributes videos among instructors based on specialty, workload and committed response time
5. Annotation tool: instructors access a web panel where they can draw lines, angles and marks on key swing frames
6. Delivery with notification: when the analysis is ready, the user receives a push notification and can view the annotated video with professional comments

Cross-platform mobile app

• Swing recording with integrated framing guides to capture the correct angle
• Optimized video upload with progress indicator and ability to resume failed uploads
• Analysis history where the player sees their swing-by-swing evolution with professional annotations
• Library of 100+ tutorials organized by category: fundamentals, long game, short game, putting and specialty shots
• Swing comparator: side-by-side view to see evolution between analyses

Backend and instructor panel

• Assignment system that distributes videos among the team of professionals based on specialty and workload
• Video annotation tool with HTML5 canvas for drawing on extracted frames
• Processing queue that handles video conversion in the background without blocking the main server
• Subscription management with Free, Birdie (2 videos/month) and Eagle (4 videos/month) plans, each with different response times
• Metrics dashboard for the team: response times, instructor load, queued videos

Structured progression

• Step-by-step philosophy: instead of correcting everything at once, the system guides the player with one change per analysis
• Improvement tracking with visual progress metrics over time
• Complete history: every analyzed swing is recorded with date, annotations and comments

Key technical decisions

Results

GolfyApp has positioned itself as an innovative alternative to traditional golf lessons:

• 5.0★ on App Store — perfect score reflecting the quality of professional feedback
• 95% conversion from free trial users to paid plan (data published on client’s website)
• Instructors with 20+ years of experience and professional circuit background
• Available on iOS, Android and web, accessible from any device
• 48h response time on the premium plan, 72h on standard — consistent delivery
• Reliable video pipeline with upload success rate above 99% even in low-coverage areas
• “One change at a time” philosophy valued by users as key to their real progress

Tech stack

• React Native (Mobile app iOS and Android)
• Node.js (Backend API, processing queue and assignment)
• FFmpeg (Compression, frame extraction and video processing)
• AWS S3 + CloudFront (Video storage and distribution)
• Firebase Cloud Messaging (Push notifications)
• Stripe (Subscription and plan management)
• HTML5 Canvas (Video annotation tool for instructors)
• Resilient upload with chunk-based resumable uploads