Python Developer with MongoDB

Project Description

We are building a resilient, secure, production-grade platform of Python backend services, REST APIs, asynchronous processing components and external integrations. The solution is backed by MongoDB and delivered through a React/TypeScript operational user interface with auditable operations and role-based enterprise user journeys.

Key Responsibilities

• Design well-structured, testable backend services and APIs with clean module boundaries and separation of concerns.
• Build asynchronous services using FastAPI/Uvicorn and Pydantic-based data modelling.
• Apply SOLID principles, object-oriented design and pragmatic design patterns (factory, strategy, repository, adapter, state, saga, outbox, CQRS).
• Drive development through Test-Driven Development (TDD) with strong unit and integration coverage of business-critical paths.
• Engineer resilience for external dependencies: circuit breakers, retry with exponential backoff and jitter, bulkheads, timeouts and stale-data fallback.
• Build security into the control flow: OAuth2/OIDC, mTLS, RBAC, maker-checker, secrets management.
• Integrate REST APIs with OAuth2 bearer flows, retries, idempotency and error mapping.
• Own features end-to-end from data model through API to UI, using Git/GitLab and CI pipelines.

Required Skills

• 8+ years of experience in Python service design with type hints, clean module/package boundaries, and separation of concerns.
• Proficiency in Async Python (asyncio), async HTTP clients, FastAPI/Uvicorn, and Pydantic.
• Strong understanding of SOLID principles, object-oriented service design and industry-standard design patterns.
• Experience with Test-Driven Development (TDD).
• Skill in REST API integration including OAuth2 bearer flows, retries, exponential backoff, idempotency, and error mapping.
• Familiarity with concurrency and distributed-systems correctness: sagas, outbox pattern, FSMs, idempotency, eventual consistency.
• Full-stack delivery mindset capable of owning features end-to-end.
• Proficiency in Git/GitLab, automated testing tools, and CI/CD pipeline management.
• In-depth knowledge of MongoDB (or comparable NoSQL) including data modelling, pymongo/Motor, transactions/replica sets, and CQRS read models.
• Expertise in React + TypeScript SPA development covering components, state management (TanStack Query / Redux Toolkit), and API integration.
• Experience with Containers & Kubernetes/OpenShift for managing stateless services, config/secrets, and leader election in a Cloud-Native environment.
• Scheduler/workers knowledge including Celery, APScheduler, Temporal, Airflow and queue patterns.

Nice to Have

• Experience in Payments or RTGS/SWIFT domains.