Principal Infrastructure Engineer

This is a fully remote position, open to applicants in Germany.

📋 Description

• Design, develop, manage, and scale the platform that powers Sezzle.

• Take ownership of intricate infrastructure projects from the architectural phase and prototyping through to implementation, deployment, and continuous operation.

• Recognize system constraints and implement enhancements to accommodate increased traffic, data volume, and workload complexity.

• Link business processes to infrastructure advancements across applications, data, and systems.

• Create capacity models, conduct load and stress testing, identify bottlenecks, and validate improvements in performance and cost.

• Design robust AWS accounts, IAM, network, and service architectures.

• Build and maintain the Kubernetes platform, including lifecycle automation, workload isolation, resource allocation, autoscaling, upgrades, and ensuring deployment reliability.

• Scale and optimize Aurora RDS for MySQL and Postgres, focusing on queries, indexes, connections, replication, failover, schema changes, and migrations.

• Establish service-level objectives and error budgets, implementing mechanisms for reliability.

• Participate in on-call duties and lead technical recovery efforts during critical incidents.

• Design, test, and document disaster recovery strategies.

• Develop infrastructure-as-code and automate operational processes.

• Enhance observability with metrics, logs, traces, dashboards, and alerts.

• Execute secure infrastructure migrations with phased rollouts and rollback strategies.

• Improve cost efficiency in cloud operations.

• Construct and assess AI-enhanced operational tools.

• Draft architecture proposals, assess trade-offs, review infrastructure modifications, and document system operations and failures.

⛳️ Requirements

• Bachelor’s degree in Computer Science or a related technical field (required).

• 12+ years of experience in infrastructure, platform, site reliability, software development, or related engineering fields.

• Extensive production experience with AWS, including compute, IAM, multi-account architectures, networking, VPC design, and private connectivity.

• In-depth production expertise with Kubernetes, covering cluster lifecycle, scheduling, resource management, autoscaling, networking, and troubleshooting.

• Strong expertise in RDS/Aurora MySQL and/or Postgres at scale.

• Proven track record of delivering infrastructure scaling enhancements personally.

• Excellent coding and automation capabilities in Golang, Python, or similar programming languages.

• Experience with infrastructure-as-code using Terraform or a comparable tool.

• Solid understanding of systems fundamentals including Linux, networking, DNS, TLS, storage, concurrency, and distributed system failure modes.

• Experience managing a 24/7 high-availability platform with active incident response and postmortem remediation.

• Willingness to engage in an on-call rotation.

• Experience implementing and testing disaster recovery strategies against specified recovery objectives.

• Practical experience in observability, load testing, capacity planning, and effective CI/CD practices.

• Active engagement with AI tooling in engineering or operations.

• Capability to navigate ambiguous technical challenges through to production delivery while collaborating across engineering disciplines.

🏝️ Benefits

• Competitive salary and performance bonuses.

• Comprehensive health, dental, and vision insurance.

• Flexible work schedule and remote work options.

• Opportunities for professional development and continuous learning.

• Collaborative and inclusive team culture.