Summary: We are seeking a Senior Python Backend Developer to lead feature and domain ownership, driving design and implementation for core backend systems powering a DTC platform for mobile game monetization. Highlights: 1. Architectural ownership and direct impact on a growing platform 2. Modern Python stack with AI-assisted development 3. Small team with high autonomy and fast decision-making 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. **What You'll Do** ------------------ **Feature \& Domain Ownership** * Drive design and implementation of new features and business domains end\-to\-end — from technical design to production rollout. * Make architectural decisions: define domain boundaries, choose patterns, design data models and APIs. **Backend Development** * Write clean, maintainable, and testable Python code following team conventions. * Design and build APIs, background workers, and event consumers with clear layered architecture. * Write tests (unit, integration, functional) and define testing strategies for new domains. **What We're Looking For** -------------------------- **Required** * 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. **Nice to Have** * 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 incidents in your areas are rare, and when they happen, they're resolved quickly with permanent fixes. * You're a go\-to person for architectural decisions and technical design within the team. **Why Join Us** --------------- * Modern Python stack (3\.13, FastAPI, SQLAlchemy v2\) with real architectural ownership. * Small team (15–20 engineers) with high autonomy and fast decision\-making. * Strict engineering culture: enforced code standards, comprehensive test guidelines, AI\-assisted development. * Direct impact on a platform serving 100\+ live games with real\-money transactions across 200\+ territories. * Mission\-driven company helping game developers achieve financial independence from app stores. * Opportunity to shape backend architecture, engineering practices, and team standards in a fast\-growing startup.