Senior Python Engineer

Senior Backend Engineer (Python / FastAPI): Multi-Tenant Cloud Migration

About the Project

We are migrating multiple business-critical applications from a single-tenant Hub-and-Spoke architecture to a scalable, multi-tenant, cloud-native backend. The platform must be highly available, secure, scalable, and high-throughput, with a strong focus on async processing, API performance, database efficiency, authentication, and production readiness. This is a delivery-driven engagement with firm deadlines and a broad group of stakeholders. It is a high-visibility position within the organization, with a strong likelihood of extension for engineers who deliver.

The Role

You will combine hands-on application migration with backend development. You will work independently, own your deliverables end to end, and communicate clearly and proactively with technical and business stakeholders.

Key responsibilities

Migrate business-critical applications from a single-tenant Hub-and-Spoke architecture to a multi-tenant, cloud-native platform

Enable multi-tenancy across existing applications and services

Design and build new REST APIs and backend functionality using Python and FastAPI

Develop scripts and automation for data and configuration migration

Design and optimize PostgreSQL schemas, queries, and data access patterns for efficiency at scale

Implement async processing and high-throughput API design

Implement authentication and security, including SSO, OAuth, OIDC, PKCE, On-Behalf-Of (OBO) flow, and API key authentication

Containerize applications with Docker and deploy them on Azure Container Apps

Build and maintain CI/CD pipelines in Azure DevOps

Ensure production readiness through automated testing, logging, monitoring, and observability

Debug, troubleshoot, and optimize performance in production environments

Integrate Azure AI services into the backend

Technology Stack

Languages and frameworks: Python, FastAPI

Database and ORM: PostgreSQL, SQLAlchemy

Containerization: Docker

Cloud: Azure Container Apps, Azure Database for PostgreSQL Flexible Server, Azure AI Search, Azure Document Intelligence, Azure AI Foundry

DevOps: Azure DevOps, CI/CD

Architecture: Multi-tenant, cloud-native

Required Skills and Experience

Python development

Strong Python development experience

Deep FastAPI expertise (essential)

Strong object-oriented programming skills and application of SOLID principles

Async programming

Scripting and automation

Database

Deep understanding of PostgreSQL and its capabilities

Strong database design skills

Experience with SQLAlchemy or an equivalent Python ORM (essential), including transactions and connection management

NoSQL experience (a plus)

API design and development

REST API design

Rate limiting and validation

API versioning and error handling

High-throughput API design

Authentication and security

SSO, OAuth, OIDC, and PKCE

On-Behalf-Of (OBO) flow

API key authentication

Secure API development practices

Architecture and scalability

Multi-tenant architecture

Highly available and scalable systems

Resilience and fault tolerance

Distributed-system concepts

Cloud and containerization

Azure-based application architecture

Docker and containerized applications

Azure DevOps and CI/CD

Production engineering

Automated testing

Logging, monitoring, and observability

Debugging and troubleshooting

Performance optimization

AI fluency

Familiarity with RAG, document processing, and visual processing concepts

Experience working with AI-assisted development tools (e.g., GitHub Copilot)

What Sets a Strong Candidate Apart

Direct experience delivering a migration project, ideally moving legacy or single-tenant systems to a multi-tenant, cloud-native architecture

A track record of independent ownership: you can clearly explain the technical decisions you made and the parts you personally designed and implemented

Clear, proactive communication with stakeholders under tight deadlines

Comfort defending architectural and technical decisions in a deep, rigorous technical discussion

Interview Process

The technical interview will be conducted by a senior engineer and will be in-depth. Expect detailed questions on your hands-on contributions, technical decision-making, and specific examples of ownership from previous projects, particularly around Python, API design, Azure, Docker, security and authentication, and migration work. Please be prepared to discuss what you personally built and delivered, rather than what the team accomplished.

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