Senior Python Backend Developer (Platform)

Responsibilities

• Backend Architecture and System Design
• Design and implement backend systems and business domains end-to-end
• Define domain boundaries, data models, and API contracts
• Make architectural decisions aligned with scalability, reliability, and maintainability
• Contribute to long-term evolution of system architecture and technical standards
• Backend Development
• Develop backend services using Python with a focus on clean, maintainable, and testable code
• Build APIs, background workers, and event-driven components with clear layered architecture
• Implement integrations with external services, including payment providers and game backends
• Handle complex workflows related to transactions, state management, and system interactions
• Data and Infrastructure
• Design and optimize database schemas and queries in PostgreSQL
• Implement caching, rate limiting, and distributed coordination using Redis
• Ensure efficient handling of high-load scenarios and large-scale data processing
• Reliability and Testing
• Define and implement testing strategies, including unit, integration, and functional tests
• Ensure high reliability of production systems, especially in payment-related flows
• Debug and resolve complex production issues with a focus on root cause analysis
• Contribute to observability through logging, metrics, and monitoring
• Cross-functional Collaboration and Leadership
• Collaborate with engineering and product teams on feature design and delivery
• Conduct code reviews and mentor other developers
• Drive engineering best practices and maintain high code quality standards
• Contribute to technical decision-making and team-level architecture discussions
• Required Qualifications
• Python 5+ years of commercial experience.
• Strong experience with FastAPI or similar async frameworks (Starlette, aiohttp).
• Deep knowledge of SQLAlchemy (preferably v2) - ORM internals, relationships, performance tuning, migrations ( Alembic ).
• PostgreSQL - advanced query optimization, indexing strategies, schema design, partitioning.
• Redis - caching strategies, rate limiting, distributed locks, pub/sub patterns.
• Proven experience designing and building REST APIs with clear layered architecture.
• Pydantic - data validation, serialization, complex schema design.
• Strong understanding of async/await patterns, concurrency, and event loops in Python.
• Experience integrating with third-party APIs and building reliable webhook/callback systems.
• Experience designing systems and making architectural decisions - choosing patterns, defining domain boundaries, managing technical debt.
• Solid testing culture: pytest , async tests, fixtures, factories, coverage strategy.
• Experience mentoring developers and conducting meaningful code reviews.
• Git, CI/CD, trunk-based or feature-branch workflows.
• AI: confident use of AI tools in daily development - from code generation and refactoring to debugging, test writing, and code review; with an understanding of risks (hallucinations, security, licensing) and mandatory result validation.

Requirements

• Experience with Google Cloud services (BigQuery, Firestore, Pub/Sub, BigTable, Cloud Storage).
• Experience with background job processing ( ARQ , Celery, or similar).
• Experience with webhook delivery systems, retry strategies, and idempotency.
• Experience with Datadog , Sentry, or similar observability tools.
• Experience in gaming, e-commerce, or fintech domains.
• Experience building multi-tenant SaaS platforms.
• Experience with event-driven architecture and message queues.
• Experience with high-load systems and horizontal scaling.
• What Success Looks Like
• New features and domains are delivered end-to-end with clean architecture, solid test coverage, and no reliability regressions.
• Integrations with game backends and external services work reliably under production load.
• Codebase quality stays high - your code reviews and mentoring raise the bar for the team.
• Production in

Additional Information

We're looking for a Senior Python Backend Developer to join the Platform team and take ownership of core backend systems powering Aghanim - a direct-to-consumer (DTC) platform that helps mobile game developers monetize outside app stores. We act as a Merchant of Record, handling payments, compliance, and taxation across 200+ territories, while providing game studios with tools for LiveOps automation, player segmentation, and community engagement. The platform serves 100+ live games through customizable Game Hubs (DTC web stores), in-game offers, subscriptions, and virtual currency systems - all with real-money transactions requiring high reliability and fraud protection. The codebase follows domain-driven design with 60+ business domains, strict code quality standards, and AI-assisted development as a standard part of the workflow. You'll work across a modern Python stack - FastAPI, SQLAlchemy v2, PostgreSQL, Redis - with a heavy integration layer connecting game backends, payment providers, and external services.

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