: Senior Python Backend Engineer

Location: Downtown Toronto, ON (100% Onsite)

Contract Duration: Immediate start through December 2026 (High likelihood of extension based on performance)

Experience Level: 5–10+ Years

Interview Process: Mandatory In-Person Technical Interview in Downtown Toronto.

About the Role

We are seeking 10 highly skilled Senior Python Backend Engineers to join a critical platform modernization initiative. This is a high-impact role focused on building robust, scalable, and secure microservices that power core business operations. You will be working in a collaborative, agile environment to solve complex distributed-system challenges.

Core Responsibilities

- Architecture & Design: Design, develop, and deploy high-availability microservices and RESTful APIs using Python.
- System Development: Build and maintain scalable backend systems capable of handling high transaction volumes with low latency.
- Database Management: Design and optimize schemas for both relational (SQL) and non-relational (NoSQL) databases.
- Cloud Infrastructure: Deploy and manage applications within public cloud environments (AWS/Azure/GCP), utilizing containerization and orchestration tools.
- DevOps & CI/CD: Champion up-to-date DevOps practices, implementing robust CI/CD pipelines and infrastructure-as-code.
- Collaboration: Participate in system design reviews, code reviews, and technical documentation. Collaborate effectively with cross-functional teams to ensure seamless integration.
- Observability: Implement monitoring, logging,



and alerting solutions to ensure system health and performance.

Required Qualifications (Must-Haves)

- Education: Bachelor’s or Master’s degree in Computer Science, Engineering, or a related field from a recognized Canadian university or college.
- Experience: 5 to 10+ years of professional software development experience, with a strong focus on backend engineering.
- Programming: Expert proficiency in Python (not data science/scripting focused).
- API Development: Extensive experience designing and building RESTful APIs with JSON and documenting via OpenAPI/Swagger.
- Architecture: Strong background in Microservices and Distributed Systems design (event-driven architecture, messaging queues).
- Databases: Proven experience with both SQL (e.g., PostgreSQL, MySQL) and NoSQL (e.g., DynamoDB, Cassandra, MongoDB).
- Cloud: Hands-on experience with at least one major cloud provider (AWS, Azure, or GCP).
- DevOps: Solid understanding of Git, CI/CD pipelines, and modern operational practices.
- System Design: Excellent system design capabilities and the ability to articulate trade-offs.

Preferred Qualifications (Nice-to-Haves)

- Domain: Experience in the Financial Services, Payments, or Fintech sector.
- Containerization: Production experience with Docker and orchestration tools like Kubernetes (EKS/AKS/GKE).
- Security: Knowledge of security best practices, compliance standards, and IAM.
- Observability: Experience with tools like Datadog, Prometheus, Grafana, or ELK Stack.

📌 Back End Developer (Toronto)
🏢 CirrusLabs
📍 Toronto