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Senior Staff Infrastructure Engineer

Flex is a growth-stage NYC-headquartered FinTech on a mission to make rent payments flexible and affordable. We’re seeking a Senior Staff Infrastructure Engineer to raise the bar for our infrastructure team, design and operate scalable AWS-native platforms, drive SRE best practices, and enable an AI-first, highly automated infrastructure that supports product velocity and reliability.

Skills

  • Deep AWS architecture experience (EKS, S3, RDS, API Gateway, DynamoDB/DocumentDB).
  • Expert Terraform and Infrastructure-as-Code practices at scale.
  • Enterprise-grade Kubernetes (EKS) architecture and microservices platform experience.
  • CI/CD design and implementation (e.g., GitHub Actions) to improve deployment velocity and safety.
  • Advanced networking and security knowledge (VPC, service mesh, service discovery, security groups).
  • Observability tooling and frameworks (metrics, logs, traces; Datadog preferred).
  • Production-grade software engineering skills in Java, Python, or TypeScript for tooling and automation.

Responsibilities

  • Define and drive long-term technical strategy for scalable, resilient cloud infrastructure at organizational level.
  • Act as the top technical authority for the infrastructure platform and steer cross-functional alignment.
  • Evaluate build vs. buy decisions for major infrastructure technologies and own tradeoffs.
  • Design, build, and operate IaC-driven infrastructure (Terraform) and reusable modules/governance.
  • Establish and evangelize SRE culture: define SLOs/SLIs, lead reliability initiatives, and run major incident responses.
  • Own improvements to developer experience: self-service platforms, CI/CD architecture, and deployment tooling.
  • Lead hyper-automation efforts to reduce operational toil and enable self-healing systems.
  • Drive observability strategy (metrics, logs, traces) and implement organization-wide monitoring and alerting.

Education

  • Bachelor’s degree in Computer Science, Engineering, or related field, or equivalent practical experience.
  • Advanced degree or relevant certifications (optional but valued).

Benefits

  • Competitive medical, dental, and vision from Day 1 (U.S. full-time).
  • Company equity and 401(k) plan with company match starting 2026 (U.S. roles).
  • Unlimited paid time off + 13 company-paid holidays.
  • Parental leave, Flex Cares Program, and free Flex subscription.
  • Competitive compensation and equity for non-U.S. full-time employees.
To read the complete job description, please click on the ‘Apply’ button
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Revathi Advaithi
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$252000 / YEARLY (est.)
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$204000K
$300000K

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SENIORITY LEVEL REQUIREMENT
TEAM SIZE
SALARY RANGE
$204,000/yr - $300,000/yr
EMPLOYMENT TYPE
Full-time, remote
DATE POSTED
March 17, 2026
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