Python Software Engineer III

TEKsystems • Toronto, ON

3d • Hybrid

About The Position

Our client is a leading global technology organization operating a high‑traffic digital marketplace that connects millions of customers worldwide. The platform serves passionate communities and delivers trusted, seamless experiences through modern, cloud‑native technology. At the core of the organization is a diverse and highly collaborative team of engineers, product leaders, and business experts who are deeply invested in innovation, technical excellence, and continuous improvement. The environment is fast‑paced, growth‑oriented, and focused on building scalable solutions that customers truly value. We are seeking a Senior Back End Engineer to play a key role in enhancing and evolving a large‑scale, consumer‑facing platform. In this role, you will collaborate with cross‑functional teams to design, build, and scale backend systems that support a global marketplace.

Requirements

• Bachelor’s degree in Computer Science or a related field with 6+ years of relevant experience, or a Master’s degree with 4+ years of relevant experience
• Strong expertise in Python, with deep familiarity across its frameworks and ecosystems
• 2+ years of hands‑on experience with AWS, including services such as Lambda, Cognito, EKS, OpenSearch, Kinesis, S3, SNS, and SQS
• Experience with containerization and orchestration tools such as Docker and Kubernetes
• Solid background in serverless computing and event‑driven architectures
• Experience working with both relational and NoSQL databases, including MSSQL, PostgreSQL, and DynamoDB
• Hands‑on experience designing and consuming web services (REST and GraphQL)
• Familiarity with messaging and streaming platforms such as Kinesis, SQS, and SES
• Strong understanding of building modular, extensible, and secure APIs
• Exposure to automated testing and quality practices (e.g., contract testing, performance testing)
• Excellent analytical, communication, and documentation skills

Nice To Haves

• Domain‑Driven Design (DDD) Architecture

Responsibilities

• Design, build, and evolve scalable, cloud‑native architectures using AWS
• Own features end‑to‑end, from system design and implementation through testing, deployment, and monitoring
• Write clean, efficient, and maintainable code, and participate in peer code reviews
• Analyze existing applications and data stores to improve performance, reliability, and scalability
• Collaborate closely with engineers, product managers, and designers to deliver high‑impact solutions
• Contribute to architectural decisions and technology direction using Domain‑Driven Design principles

What This Job Offers

• Job Type: Full-time
• Career Level: Senior
• Number of Employees: 501-1,000 employees