WebRTC Engineer
23 hours ago
Job description
We are seeking a highly disciplined WebRTC engineer to stabilize and harden our existing signaling backbone within a PHP CodeIgniter 3 (CI3) monolith.
This is not a greenfield build.This is a precision hardening assignment focused on reliability, ICE resilience, reconnection integrity, structured observability, and architectural discipline.
You will be responsible for delivering production-grade signaling stability that supports future optionality (Video, Push-to-Talk, Broadcast, hybrid topologies) without introducing vendor lock-in or architectural coupling.
What This Project Is
- Reliability hardening
- ICE restart stabilization
- Mobile background/resume recovery
- Server-side session cleanup enforcement
- Track lifecycle integrity
- Structured logging & observability
- Clean CI3 controller/model discipline
What This Project Is NOT
- No LiveKit, Twilio, Agora, or proprietary SDKs
- No third-party signaling services
- No topology replacement (no SFU introduction in this phase)
- No UI redesign
- No Push-to-Talk build
- No performance scaling or load testing
⸻
Core Responsibilities
- Signaling Stabilization
- Clean and validate CI3 signaling endpoints
- Enforce hotel-scoped authorization
- Deliver structured JSON error responses (auth vs signaling vs ICE)
Ensure deterministic room identity:
hotel_id + room_id
⸻
- ICE & Session Reliability
- Reliable ICE restart after network toggle
- Mobile background/resume reconnection
- Eliminate orphan sessions in DB
- Prevent zombie peer connections after repeated join/leave cycles
- Enforce server cleanup within 60 seconds of unexpected disconnect
- Track Lifecycle Integrity
- Clean publish/unpublish cycles
- No ghost or duplicated tracks
- Allow rejoin without full page refresh
- Observability & Logging
All events must log:
- user_id
- hotel_id
- room_id
- timestamp
- event_type
Logs must:
- Be human readable
- Be searchable
- Distinguish failure classes clearly
- Code Governance Requirements
- Strict CI3 controller/model separation
- No inline secrets
- No direct DB writes outside model layer
- No debug logs in production commits
- All work submitted via Pull Request
- Code must be committed to official repository before milestone completion
Mandatory Deliverables
1. Reproducible documented test steps
2. Cross-browser validation:
- iOS Safari
- Android Chrome
- Desktop Chrome
10–15 minute Loom walkthrough demonstrating:
- Join/publish cycle
- Network toggle ICE restart
- Rejoin without refresh
- Log inspection
5. Updated high-level signaling flow diagram
⸻
Acceptance Criteria (Payment Released Only After)
- Two users successfully join same hotel-scoped room
- Publish/unpublish works repeatedly without failure
- ICE restart succeeds after network toggle
- No orphan or zombie sessions
- Server cleanup verified ≤60 seconds after disconnect
- Rejoin without refresh
- Structured logs validated
- Loom walkthrough delivered
- All tests reproducible by owner in staging
Ideal Candidate Profile
- Strong WebRTC fundamentals (ICE, STUN/TURN, reconnection flows)
- Experience debugging mobile browser behavior
- Experience working inside legacy monoliths (CI3 preferred)
- Architecture-disciplined and governance-aware
- Comfortable working within strict constraints
- Clear communicator who respects scope boundaries
Bonus (Not Required)
- Experience building vendor-neutral WebRTC infrastructure
- Experience designing for future topology evolution
- Experience in hospitality or operational software systems
Mandatory skills:
WebRTC, real-time applications, Websockets, audio / voip, JavaScript
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