Senior AWS Cloud & Platform Developer – GenAI / Mainframe Modernization (Bedrock / CDK) Duration: 3 Months (Likely to extend) Location: Toronto (Hybrid, 2x/week) Overview: We are seeking a Senior AWS GenAI & Platform Developer to support a large-scale mainframe modernization initiative.

This role will be responsible for developing and deploying a Generative AI solution within the AWS ecosystem, while also building the supporting cloud platform and infrastructure required to run it.

The ideal candidate will bring a strong combination of AWS application development, platform engineering, infrastructure-as-code, containerization, and hands-on GenAI/RAG implementation experience.

Responsibilities Design, build, and deploy Generative AI solutions within the AWS cloud ecosystem.

Develop a RAG-based GenAI solution that monitors API failures, processes Cloud

Watch logs, and leverages an LLM to provide root-cause analysis and recommended remediation.

Build and deploy AWS infrastructure and platform components using AWS CDK .

Develop and integrate solutions using AWS services including Bedrock, Lambda, ECS, Fargate, ECR, RDS, S3 and Cloud

Watch .

Implement and support vector-based retrieval capabilities for GenAI/RAG use cases.

Configure and integrate Bedrock Knowledge Bases and related GenAI services.

Build, modify, package, and deploy Docker images to Amazon ECR for use with ECS and Fargate.

Configure and support application networking components including Application Load Balancers (ALB) and Network Load Balancers (NLB) .

Integrate application, infrastructure, logging, and GenAI components into scalable AWS-based solutions.

Troubleshoot application and platform issues across the AWS workplace.





Work closely with engineering, cloud, platform, SRE, and modernization teams to support delivery of the solution.

Must Haves Strong hands-on AWS cloud development and platform engineering experience.

Hands-on experience developing Generative AI solutions using AWS Bedrock .

Experience designing or implementing RAG pipelines and integrating LLMs into enterprise applications.

Strong experience with AWS CDK for infrastructure-as-code and cloud platform deployment.

Hands-on experience with AWS Lambda, ECS, Fargate and ECR .

Strong Docker/containerization experience, including building and modifying container images.

Experience working with Cloud

Watch logs and AWS observability services .

Experience with RDS and/or vector database/vector store technologies supporting GenAI retrieval use cases.

Experience with S3 and AWS-native application integrations.

Experience configuring or integrating ALB and NLB .

Strong software development background with the ability to work across both application development and cloud platform engineering .

Experience building and integrating APIs within cloud-based environments.

Nice to Haves Experience with Amazon Bedrock Knowledge Bases .

Exposure to Amazon Bedrock Agent

Core .

Experience building GenAI solutions focused on application monitoring, incident analysis, root-cause analysis, or automated remediation .

Experience working within SRE, Dev

SecOps, cloud engineering, or platform engineering environments.

Previous experience supporting mainframe modernization or large-scale application modernization initiatives .

Experience working within a large, complex or regulated enterprise environment.

📌 Senior AWS Cloud & Platform Developer – GenAI / Mainframe Modernization (Bedrock / CDK) (Toronto)
🏢 S.i. Systems
📍 Toronto