Senior AWS Platform Engineer

We are looking for a Senior AWS Infrastructure Engineer to redesign our AWS environment. The successful candidate will lead the design and implementation of a secure, scalable, multi-account AWS architecture, enable cost chargeback, and establish long-term operational best practices. This role is infrastructure-first, requiring strong operating system, networking, and security fundamentals, in addition to deep AWS experience We thank all applicants for their interest; however, only those selected for an interview will be contacted. FreeBalance is an inclusive employer dedicated to building a diverse workforce to increase the representation of the designated groups based on each country’s legislation. We encourage applications from all qualified candidates and will accommodate applicants’ needs under the respective labour law throughout all stages of the recruitment process. country: CA all locations: [Ottawa, Ontario, Canada] commitment: Full-time department: Research & Development location: Ottawa, Ontario, Canada team: *Global Key Responsibilities:: AWS Architecture & Multi-Account DesignDesign and implement a best-practice multi-account AWS architecture using AWS Organizations and Control TowerDefine account strategies for customers, environments (Prod / Non-Prod), and shared servicesEstablish and maintain an AWS Landing Zone aligned with security and compliance requirementsReduce operational and security risk by eliminating single-account blast radiusMigration & ExecutionPlan and execute phased migrations of existing workloads from a monolithic AWS account to multiple accountsMinimize downtime and risk through careful migration planning, testing, and rollback strategiesWork closely with application and platform teams during migration and cutoverInfrastructure as Code & AutomationCodify account provisioning and baseline infrastructure using TerraformAutomate guardrails, networking, IAM, logging, and security controlsUse CI/CD pipelines to support infrastructure as code, not as an application DevOps roleSecurity & GovernanceDesign and enforce security guardrails using SCPs, IAM boundaries, and least-privilege accessImplement and manage centralized security services including CloudTrail, GuardDuty, Security Hub, and AWS ConfigSupport compliance and audit requirements (e.g. ISO 27001) through strong segregation of duties and loggingNetworkingDesign and operate AWS networking at scale, including:VPC design and segmentationCentralized networking modelsTransit Gateway (nice to have)Hybrid connectivity (VPN / Direct Connect where applicable)Apply strong TCP/IP, DNS, and routing fundamentalsCost Management & ChargebackImplement cost monitoring, budgeting, and reporting using AWS Cost Explorer and BudgetsEnable cost separation and chargeback/showback per customer or accountSupport long-term FinOps visibility as the AWS environment scalesOperating Systems & Infrastructure OperationsApply strong Linux and/or Windows systems engineering knowledgeSupport OS-level hardening, patching, access control, and troubleshootingUnderstand how cloud infrastructure maps to underlying OS and network behavior Required Qualifications:: Senior-level experience designing and operating AWS infrastructure at scaleHands-on experience with AWS Organizations, Control Tower, and multi-account architecturesProven experience migrating workloads from single-account to multi-account AWS environmentsStrong Linux and/or Windows OS fundamentalsStrong networking fundamentals (TCP/IP, DNS, routing)Infrastructure as Code using TerraformExperience implementing security guardrails (SCPs, IAM, KMS)Experience with centralized logging, monitoring, and security toolingExperience with AWS cost management and chargeback/showback models Nice to have:: AWS Transit Gateway and advanced networking architecturesExperience in regulated or compliance-driven environments (e.g. ISO 27001)AWS Professional certifications (Solutions Architect Pro, DevOps Engineer Pro)Experience designing long-term AWS platform or cloud foundations