Principal Site Reliability Engineer

Overview

What We Do

Zefr is the leading global technology company enabling responsible marketing in walled garden social environments. Zefr’s solutions empower brands to manage their content adjacency on scaled platforms such as You Tube, Meta, Tik Tok, and Snap, in accordance with industry standard frameworks. Through its patented AI technology, Zefr offers brands and agencies more accurate and transparent solutions for social walled gardens.

The company is headquartered in Los Angeles, California, with additional locations across the globe.

As a Principal Site Reliability Engineer at Zefr, you ll serve as a technical leader and subject matter expert, helping define the technical vision and shape the direction of our reliability practices across the organization.

You ll leverage deep expertise in observability, core SRE principles, cloud infrastructure, CI/CD and Dev Sec Ops  to solve our most complex challenges and set the standard for engineering excellence.

This role requires a blend of hands-on technical expertise and strategic thinking. You ll drive cross-functional initiatives, mentor engineers across teams, and partner with leadership to ensure our AI-powered platform is robust, efficient, and scalable.

We’re looking for someone to combine their technical expertise with strong leadership and a passion for continuous improvement and innovation. Zefr wants a candidate that champions reliability as a product feature, and can translate complex technical concepts into strategy. This is a role where you ll shape how we build and operate systems at scale.

• Support and build systems and tools that enable other engineers to generate, deploy, and manage product features and models both quickly and safely.
• Deploy and support a multi-cloud, micro-service architecture, including infrastructure tailored for ML workloads, deployed via Github Actions, ArgoCD & Kubernetes.
• Collaborate with other engineers to architect secure, resilient, scalable, and cost-efficient applications and ML systems/pipelines in AWS and GCP.
• Foster and push our Dev Ops culture and philosophy by encouraging continuous improvement across all engineering teams.
• Proactively maintain the health of production environments, including monitoring application performance and resource utilization.
• Participate in 24/7 on-call rotation, respond to system performance issues and outages.
• Debug code at the application and infrastructure level.
• Mature our CI/CD workflows and release process.
• Maintains a forward-thinking approach, actively researching and proposing new solutions.
• Propose and review Engineering Request for Comments (RFC) to drive Engineering architecture and practices.

Core Infrastructure & Cloud Platforms:

• Cloud Providers:
  Google Cloud Platform (primary), Amazon Web Services
• Infrastructure as Code (IaC):
  Terraform, Terragrunt
• Containerization & Orchestration:
  Docker, Kubernetes (experience with GKE and/or EKS expected), Helm, Kustomize
• Service Mesh:
  Istio

CI/CD & Automation:

• CI/CD Pipelines:
  Git Hub Actions
• Git Ops / Continuous Delivery:
  Argo CD
• Primary Scripting/Automation Language:
  Python

Observability & Monitoring:

• Monitoring & Alerting:
  Prometheus, Chronosphere, Pagerduty
• Telemetry Standards:
  Open Telemetry

Application & Data Ecosystem (Supporting):

• Application Languages/Frameworks:
  Python, FastAPI, Flask, Node.js, React
• Data Streaming:
  Apache Kafka
• Data Processing/Transformation:
  Pandas, DBT
• Workflow Orchestration:
  Apache Airflow, Ray

Data Stores & Databases:

• Relational Databases:
  Postgre
  
  SQL (including managed versions like AWS Aurora, GCP Cloud SQL)
• No
  
  SQL Databases:
  DynamoDB
• Search Databases:
  Open Search
• Vector Databases:
  Qdrant
• Caching:
  Redis
• Data Warehousing:
  Snowflake

• 10+ year job history designing, managing, deploying, and supporting Cloud Infrastructure in a production environment using major public cloud providers (GCP experience a huge bonus)
• Experience in Advertising or Ad Tech
• Demonstrated technical leadership experience; including mentoring engineers, driving cross-functional projects, and influencing architectural decisions at an organizational level.
• Knowledge of Git Ops including…