Senior Staff Infrastructure Engineer at Flex in Remote

Summary: Flex is a growth-stage FinTech company headquartered in NYC, focused on creating the best rent payment experience. They are seeking a Senior Staff Infrastructure Engineer to lead the Infrastructure Engineering team in designing and maintaining a scalable infrastructure that supports their mission. Responsibilities: - Define the long-term technical strategy for scalable and resilient infrastructure, guiding cross-functional teams to implement solutions that optimize for performance, resilience, and cost at an organizational level - Serve as the top technical authority ensuring the entire infrastructure platform aligns with critical business objectives and sets a high bar for industry standards - Own the end-to-end "build vs. buy" evaluation and decision process for all major infrastructure technology, weighing long-term cost, maintenance, scalability, and strategic business alignment - Serve as a hands-on technical authority, with the ability to dive deep into any part of the technology stack to diagnose complex systemic issues and drive best-in-class engineering solutions - Establish and evangelize a world-class SRE culture and practices across all engineering teams, defining SLOs/SLIs and leading initiatives to achieve target reliability goals for critical systems - Own and drive significant improvements in the end-to-end developer experience, including the architecture of self-service platforms, advanced CI/CD systems, and deployment mechanisms to maximize organizational velocity - Take command of major, high-severity incident responses that cross team boundaries, instituting structured post-incident review processes to extract systemic lessons and drive fundamental, long-term resilience improvements - Lead the vision for hyper-automation across the infrastructure domain, building sophisticated automated pipelines and tools that reduce operational toil to near zero and enable a self-healing system - Communicate complex technical strategies and decisions with executive leadership, peer organizations, and the broader engineering community, driving alignment and buy-in for the infrastructure roadmaps Required Qualifications: - Minimum of 10 years of cloud infrastructure experience - Deep mastery and architectural-level experience in designing, building, and operating highly-scaled, resilient cloud infrastructure on AWS - Deep expertise in services like EKS, S3, RDS, API Gateway, and various NoSQL/database solutions (DocumentDB, DynamoDB) - Expert-level proficiency and a track record of driving Infrastructure as Code (IaC) best practices using Terraform at an organizational scale - Extensive experience and leadership in architecting and managing enterprise-grade, highly-available Kubernetes (EKS) and microservice platforms - Ownership of and demonstrated expertise in defining and implementing world-class CI/CD pipelines (e.g., GitHub Actions) - Proven track record of architecting and delivering internal self-service platforms and advanced developer tooling - Deep understanding and hands-on experience with advanced networking concepts (e.g., mesh, service discovery, cloud VPC design, security groups) - Exceptional technical communication and cross-functional leadership skills - Demonstrated experience defining and leading the implementation of a unified, end-to-end observability (metrics, logs, traces) framework using industry-leading tools (Datadog preferred) - Experience coding/reading in one of the industry standard languages such as Java, Python, TypeScript Required Skills: Cloud Infrastructure, AWS, Infrastructure as Code, Kubernetes, CI/CD Pipelines Important Skills: Networking Concepts, Java, Python, TypeScript, Observability Frameworks Benefits: Competitive medical, dental, and vision available from Day 1, Company equity, 401(k) plan with company match (our company match kicks off at the beginning of 2026), Unlimited paid time off + 13 company paid holidays, Parental leave, Flex Cares Program, Free Flex subscription, Competitive compensation + company equity, Unlimited PTO