How Streaming Tech TV+ Was Built

A full streaming platform built by a team of 6 AI agents and 1 human. Every line of code — backend, frontend, VOD pipeline, CMS, auth — was written by Claude Code agents, deployed on Eyevinn Open Source Cloud and served through CloudFront CDN.

The Team

Role	Agent	Model	Focus
Team Lead	team-lead	Claude Opus	Coordination, decisions
Architect	architect	Claude Opus	System design
UX Designer	ux-designer	Claude Opus	Wireframes, design
Backend Dev	backend-dev	Claude Sonnet	Node.js/TypeScript API
Frontend Dev	frontend-dev	Claude Sonnet	Next.js UI
QA Tester	tester	Claude Sonnet	Testing

Human: Jonas Birmé — direction, testing, deployment decisions.

By the Numbers

15,000+

Lines of Code

Commits

Source Files

OSC Services

~150

Agent Hours

~36h

Wall-Clock Time

6 AI agents working in parallel for ~36 wall-clock hours = ~150 cumulative agent-hours of coding, testing, and debugging.

Architecture

  Browser
    │                    ┌──────────────────────┐
    ├───(analytics)─────▶│  EPAS Eventsink      │
    │                    │  (Event collector)    │
    │                    └──────────┬───────────┘
    │                               │
┌───▼──────────┐                    ▼
│  CloudFront  │ ◀──────── ┌──────────────┐
│  CDN         │           │  ClickHouse  │
└───┬──────────┘           │  (Analytics) │
    │                      └──────────────┘
┌───▼──────────┐  /api/*   ┌──────────────┐     ┌──────────┐
│  Next.js     │──(proxy)──▶│  Express API │────▶│ PostgreSQL│
│  Frontend    │            │  Backend     │     └──────────┘
│  (Web Runner)│            │  (Web Runner)│
└──────────────┘            └──────┬───────┘
                                   │
                            ┌──────▼───────┐
                            │    MinIO     │ ◀── Upload (S3)
                            │  (S3 storage)│
                            └──────┬───────┘
                                   │
                  ┌────────────────▼────────────────┐
                  │  SVT Encore  →  Packager        │
                  │  (Transcode)    (HLS fMP4)      │
                  └────────────────┬────────────────┘
                                   │
                  ┌────────────────▼────────────────┐
                  │       Auto-Subtitles            │
                  │    (Whisper speech-to-text)      │
                  └─────────────────────────────────┘

Infrastructure (OSC Services)

Service	Purpose
CloudFront CDN	Edge caching + custom domain
Web Runner (x2)	Frontend + Backend hosting
PostgreSQL	Primary database
Valkey (x2)	Config store + VOD pipeline queue
App Config Service	Runtime configuration
MinIO	Video/thumbnail S3-compatible storage
SVT Encore	ABR video transcoding
Encore Callback Listener	Transcoding event relay
Encore Packager	HLS fMP4 packaging
Auto Subtitles	Speech-to-text via Whisper
Continue Watching API	Resume playback tracking
EPAS Eventsink	Player analytics event collector
ClickHouse	Analytics time-series database
EPAS Worker	Event processing pipeline

Features Delivered

HLS video streaming with ABR

Full VOD pipeline (upload → transcode → package)

Auto-subtitles via Whisper speech-to-text

Subtitle editor with visual timeline

CMS admin panel with talk management

Multi-speaker support per talk

User authentication with JWT cookies

Watchlist & continue watching

CloudFront CDN with custom domain

API proxy for first-party cookies

Dark theme design system

Social sharing with timestamps

Embeddable video player (oEmbed)

SEO with JSON-LD structured data

Responsive design (mobile to 4K)

WCAG 2.1 AA accessibility

Analytics dashboard (views, QoE, retention)

Per-talk drill-down with audience insights

Email verification & password reset

YouTube import with yt-dlp

Key Debugging Moments

Presigned URLs don't work in OSC

MinIO presigned URLs require direct network access. Switched to proxying uploads through the backend.

Encore needs OSC auth

API calls to SVT Encore require an OSC Service Access Token (SAT). Had to implement PAT → SAT token exchange.

Separate Valkey instances

Config service and VOD pipeline queue MUST use separate Valkey instances. Sharing causes WRONGTYPE errors.

ZADD vs LPUSH

The Encore Packager expects jobs in a sorted set (ZADD), not a list (LPUSH). Subtle but critical.

MinIO proxy dropping connections

Encore's ffmpeg reads via HTTP over minutes. The proxy dropped the connection at 32MB. Fixed by using S3 protocol directly.

OSC reverse proxy body limit

125MB video upload failed with 413. Fixed with presigned URL multipart upload — 20MB chunks go directly to MinIO.

CDN caching stale 404s

Next.js ISR cached a 404 for the homepage when the API wasn't reachable during startup. CloudFront served the stale response.

Third-party cookie blocking

CDN on plus.streamingtech.se couldn't auth with API on a different domain. Fixed with Next.js API proxy for same-origin cookies.

Built with AI + Open Source

This project demonstrates what's possible when AI agents collaborate with humans on real-world software using open source infrastructure.

Try Claude Code Explore Open Source Cloud