Siebel developer • toronto on
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Position Description:
We are seeking a Senior Python API Engineer with strong experience in the payments, fintech, or banking domain to design, develop, and scale cloud-native backend services and APIs. In this role, you will leverage Python to build high-performance, secure, and resilient microservices that enable seamless integration across internal platforms, third-party partners, and payment ecosystems.
You will be responsible for designing and implementing RESTful and event-driven APIs, developing scalable backend solutions, and contributing to architecture decisions that support mission-critical financial systems. The ideal candidate has deep expertise in Python, distributed systems, API design, and cloud-native development on AWS, with a strong understanding of reliability, security, and performance best practices.
Working within a collaborative, cross-functional environment, you will help deliver robust solutions that support high-volume transaction processing, real-time integrations, and evolving business needs. This role is ideal for an engineer who enjoys solving complex technical challenges, mentoring team members, and driving engineering excellence through modern software development practices.
Your future duties and responsibilities:
Design, develop, and maintain scalable backend systems and APIs using Python
Build and implement cloud-native solutions on AWS to support payment processing and related services
Define and enforce API design standards to ensure consistency, usability, and performance
Develop event-driven architectures using streaming and messaging technologies (e.g., Kafka, AWS SQS)
Collaborate with cross-functional stakeholders to translate business requirements into technical solutions
Contribute to system architecture and design, ensuring scalability, resilience, and performance
Implement monitoring, observability, and alerting solutions (e.g., Datadog, Prometheus)
Manage and automate infrastructure using Infrastructure as Code tools such as Terraform
Deploy and maintain services in Kubernetes-based environments
Integrate with internal and external systems while maintaining strong security and reliability standards
Participate in code reviews, testing, and continuous improvement of engineering practices
Required qualifications to be successful in this role:
7–12 years of experience in software engineering, with a focus on backend/API development
Strong experience in the payments or banking domain
Proficiency in Python and building production-grade backend systems
Experience designing and implementing RESTful APIs and integration solutions
Hands-on experience with AWS cloud services
Experience with Kubernetes deployments and containerized applications
Familiarity with Infrastructure as Code (Terraform)
Experience working with event-driven architectures and messaging systems (Kafka, AWS SQS, or similar)
Knowledge of observability and monitoring tools such as Datadog or Prometheus
Demonstrated ability to design scalable and resilient systems
Preferred Skills
Experience working with high-volume or real-time financial systems
Strong understanding of system performance optimization and reliability engineering
Exposure to secure API design and compliance considerations in financial environments
"CGI is providing a reasonable estimate of the pay range for this role. The determination of this range includes factors such as skill set level, geographic market, experience and training, and licenses and certifications. Compensation decisions depend on the facts and circumstances of each case. A reasonable estimate of the current range is $95,–$,. This role is an existing vacancy."
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