Build sophisticated backend systems for a global karaoke platform using modern Python. You'll maintain our production Django/DRF API while building new services with FastAPI, solving complex challenges at scale.

What You'll Do

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 Django support and async support, automated linting, CI/CD pipelines

• Development: Python, Pydantic, Docker, modern tooling, automated code quality checks

• Architecture: Multi-tenant patterns, clean architecture for new services, well-tested and type-safe

Our main API runs on Django/DRF serving production traffic. We're building new services with FastAPI/SQLAlchemy. You'll work across both stacks.

What We're Looking For

Must have:

• 6+ years backend development experience with Python

• Production experience with Django and Django Rest Framework

• Deep PostgreSQL expertise (query optimization, migrations on large datasets, indexing strategies)

• Strong grasp of API design, architectural patterns, and system integration

• Production debugging skills with monitoring tools

Nice to have:

• FastAPI and SQLAlchemy experience (especially async patterns) - we're actively building new services with this stack

• Deep understanding of async/await patterns and ASGI servers

• Domain-Driven Design implementation experience

• Multi-tenant architecture patterns

• WebSocket or real-time feature implementation experience

• Celery task orchestration at scale

• Cloud infrastructure experience (AWS)

• Efficient cache usage patterns (Memcache, Redis, Valkey, etc.)

• Type system expertise (mypy, generics, type narrowing)

• Background in performance optimization and query analysis

• Experience integrating third-party APIs (payments, analytics, OAuth flows)

• Global market/GDPR compliance knowledge

• Experience with AI coding assistants (Claude Code preferred) or eagerness to adopt AI-enhanced workflows

About Singa

Singa is transforming the global karaoke industry with a modern streaming platform that serves 2 million+ users and 1,600+ venues across 34 countries. With 100,000+ songs including original artist recordings through partnerships with major labels like Warner Music Group, we're building the digital future of karaoke.

Our Finland-based engineering team maintains our Business Pro iOS application serving professional venues worldwide. We prioritize thoughtful architecture, memory efficiency, and testing practices that enable sustainable growth while solving real operational problems with elegant technical solutions. 

Work Model

• Hybrid: 2-3 days remote per week, office in Helsinki

• Fully Remote Option: accommodate full remote if candidate is able to show a proven capability working effectively while fully remote with a larger team that’s in the office.

Our Commitment to Diversity

We're building a team that reflects the diversity of the European developer community. We evaluate candidates on technical skills and architectural thinking, not academic pedigree or career path.

We provide interview accommodations for candidates who need them. Our collaborative approach ensures technical decisions are inclusive and transparent.

Don't meet every requirement? Research shows underrepresented groups apply only when they meet 100% of qualifications. If you're excited about sophisticated iOS architecture and modern Swift patterns, we encourage you to apply.

How to Apply 

If this sounds like you, come join us in spreading the joy of singing! Please send your resume and GitHub profile (or code samples) and answer the questions in the application form.

We review applications weekly already during the application period and will fill the position as soon as we find the right person, so we encourage you to apply quickly. Our recruitment process includes interviews as well as a take-home assignment. 

Interview Process:

1. Initial Call (30 min): Experience review, role expectations, answer your questions

2. Technical Screen (60 min): Problem-solving with AI tools allowed - we evaluate how you work with modern development tools

3. System Design (60 min): Real-world iOS architecture scenario, discuss trade-offs and performance considerations

4. Pair Programming (60 min): Collaborative coding session on realistic iOS problems using your preferred IDE and AI tools

Our Philosophy: We encourage using AI coding assistants (Claude Code, Copilot, etc.) during technical interviews - they're part of modern development. We're interested in how you think, collaborate, and deliver quality code, not memorized algorithms.