Full-Stack Engineer (Angular + Firebase + Node)

We are looking for a senior full-stack engineer who is strong in Angular, Firebase, and Node.js (Cloud Functions) — someone comfortable owning a full codebase, upgrading major frameworks, improving architecture, integrating third-party AI services, and ensuring the system is reliable and scalable.

This role involves significant work in:

• Frontend modernization (Angular 21, Signals, state robustness)
• Backend refactoring (Cloud Functions maintenance)
• Audio/video processing pipelines
• AI API integrations (SpeechAce, IBM Watson, Forvo, Pearson Versant)
• Data visualization for instructors (D3.js)
• Research-grade analytics API
• High-volume user event tracking

Key Responsibilities

1. Maintain & Modernize the MVP

• Upgrade Angular 20 → 21 and refactor the app architecture using Signals for state propagation.
• Introduce Vitest tests across ~27 modules.
• Improve state reliability between components/modules.
• Update Google Cloud Functions (Node 18/20), including:
  • Token management (IBM Watson, SpeechAce, Oxford)
  • API compatibility updates
  • Rate limiting / background jobs / error handling

2. Build Adaptive Learning Mechanics

• Implement logic for learned-word tracking (skip known words, boost learning speed).
• Maintain Firestore schema & optimize for high-frequency events.
• Integrate human-recorded audio from Forvo and AI voices (IBM Watson TTS).

3. Video Processing Pipeline for Instructors

• Implement video upload & storage flow (Firebase Storage).
• Build transcription pipeline (instructor upload OR auto-transcription).
• Implement AI-based sentence-timing detection.
• Cut videos into sentence-level clips & generate metadata:
  • IPA transcription
  • Word lists
  • Translations
• Save metadata into Firestore (one doc per clip).

4. Pronunciation Feedback & Assessments

• Replace Google STT feedback with SpeechAce API.
• Integrate Pearson Versant for assessments (listening, speaking, reading, writing).
• Handle all event tracking & scoring workflows.

5. Instructor Dashboard & Analytics

• Capture every click, correct reply, incorrect reply, and speech scoring event.
• Build data visualizations in D3.js for:
  • Student performance
  • Phoneme-level difficulty
  • Class summaries
• Build a research API for academic partners.

Required Skills & Experience

Essential

• 5+ years experience as a full-stack or frontend-heavy engineer
• Strong Angular experience (preferably Angular 15+)
• Experience upgrading Angular apps (e.g., 13→15, 15→17, etc.)
• Strong understanding of:
  • Angular Signals
  • RxJS
  • Modular architecture
  • Material components
• Firebase expertise:
  • Firestore data modeling
  • Firebase Storage
  • Firebase Auth & security rules
  • Firebase Functions (Node)
• Node.js 16–20 for Cloud Functions
• Experience writing tests (Vitest, Jest, or similar)
• Experience with media processing (audio/video) or willingness to learn
• Experience integrating third-party APIs

Nice-to-Have

• Speech/phonetics domain experience
• Experience with D3.js visualizations
• Experience with AI APIs (STT/TTS, SpeechAce, Pearson Versant)
• Experience building instructor dashboards or educational platforms