Member of Technical Staff - Platform Foundations

About the role

Joining Reflection means building from the ground up as part of a talent-dense team. You will help define our future as a company, and help define the future of open foundational models.

What This Team Does

• Build and operate the foundational platform layer that every engineering team depends on.
• Define opinionated golden paths for cloud infrastructure, networking, and access patterns so the safe and scalable path is also the easiest to follow.
• Work across cloud infrastructure, network primitives, security guardrails, and developer tooling to ensure engineers can ship quickly without sacrificing reliability, security, or cost predictability.
• Ship secure defaults and guardrails that make the safe path the easy path.
• Build and operate core networking primitives including routing, DNS, load balancing, and connectivity.
• Establish baseline observability and operational hygiene across services and infrastructure.
• Own developer infrastructure such as build systems, CI/CD, caching, and test infrastructure to keep engineers shipping fast.
• Drive cloud cost visibility and reduction through tooling, guardrails, and optimization without slowing teams down.

What You'll Work With

• Cloud & Multi-Cloud Architecture: GCP, AWS, multi-cloud design, VPC architecture, private DNS, load balancers, advanced routing (BGP), large-scale Kubernetes clusters, control plane scaling.
• Identity & Security Foundations: IAM, OIDC, RBAC, KMS, secrets management, policy-as-code (OPA, Gatekeeper), secure defaults, cloud guardrails.
• Infrastructure & Automation: Terraform, Pulumi, Kubernetes foundations, CI/CD systems, Bazel, build caching, hermetic builds.
• Observability & Cost Governance: Prometheus, Grafana, OpenTelemetry, logging and metrics systems, FinOps, cloud cost optimization.

About You

• Strong infrastructure or platform engineering background with experience shipping production-grade systems.
• Deep expertise in at least one of: cloud platforms, network engineering, security architecture, or developer tooling — with working knowledge across the others.
• Comfortable navigating complex multi-team environments, debugging hard infrastructure problems, and building for reliability and scale.
• Thriving in a high-agency, fast-paced environment; bias toward action and impact.
• Excited about zero to one challenges — building new systems rather than maintaining legacy ones.
• Collaborative, clear communicator, comfortable working across research and infrastructure boundaries.
• Motivated by creating the secure, self-serve foundation that the world's most capable open-weight AI systems are built on.

We Offer

• Top-tier compensation: Salary and equity structured to recognize and retain our talent globally.
• Stock options: Everyone who joins and contributes to Reflection's success gets to share in the upside through stock options.
• Health & wellness: Comprehensive medical, dental, vision, and life, with an annual wellness allowance.
• Meals: Lunch and dinner are provided in the office daily.
• Life & family: 22 weeks paid parental leave for all new birthing and non-birthing parents, including adoptive and surrogate journeys.
• Vacation days: Unlimited paid time off in the U.S. and 30 days in the U.K.
• Sponsorship support: We sponsor visas to help exceptional talent join our team and support long-term immigration pathways where applicable.
• Team building: We have regular off-sites, happy hours, and team celebrations.