Senior Backend Engineer

About this role

Responsibilities

• You'll work on critical backend infrastructure for Singa's karaoke platform serving 2 million+ users and 1,600+ venues globally. You'll maintain and evolve our production Django/DRF API while building new services with FastAPI and SQLAlchemy. You'll implement clean architecture patterns, optimize multi-tenant systems, and integrate complex third-party services.
• Your responsibilities: Maintain and evolve our production Django/DRF API with complex integrations (payment processing, music services, analytics)
• Design and build new backend services using FastAPI, SQLAlchemy, and async patterns
• Integrate and maintain third-party services
• Collaborate with frontend engineers to design clean, versioned API contracts
• Make and document architectural decisions for new services
• Optimize database queries (both Django ORM and SQLAlchemy) and prevent common performance pitfalls
• Debug production issues using monitoring tools and crash reporting services (Sentry)
• Navigate technical debt decisions while maintaining feature velocity
• Implement real-time features using WebSocket connections
• Maintain strict type safety and comprehensive test coverage
• Leverage AI coding assistants to accelerate development while maintaining code quality
• Our Tech Stack Backend Frameworks: Django + Django Rest Framework (main production API), FastAPI (new services)
• Data: PostgreSQL with PostGIS, Django ORM, SQLAlchemy (async for new services), database migrations
• Background Tasks: Celery with RabbitMQ, WebSocket support
• Infrastructure: Cloud infrastructure (AWS), CDN, containerized deployments
• Integrations: Payment processing, email delivery, music services, analytics platforms, recommendation engines
• Auth: OAuth 2.0, JWT/PASETO, modern token standards
• Testing/CI: pytest with Djang