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About the Role

We're looking for a Site Reliability Engineer (SRE) to drive the reliability of Tinker end-to-end. You'll work alongside the engineers building the platform and research teams to make every layer of the system more robust and resilient.

Responsibilities

Define and own end-to-end reliability, from CI/CD flows to production observability and incident response.
Develop appropriate Service Level Objectives for distributed training systems, balancing job completion reliability and scheduling latency with development velocity.
Design and implement monitoring and observability across the full training path.
Drive incident response for Tinker platform issues, ensuring rapid recovery, thorough incident reviews, and systematic improvements that prevent recurrence.
Harden multi-tenant isolation and resource scheduling so that LoRA-based workload co-scheduling maximizes utilization without compromising reliability or data separation.
Collaborate with security teams to address production vulnerabilities.

Requirements

Bachelor's degree or equivalent experience in computer science, engineering, or similar.
Experience in distributed systems, cloud infrastructure, or site reliability engineering.
Proficiency writing software to solve reliability problems, including building tooling and automation.
Experience with production incident response, postmortems, and systematic reliability improvement.
Strong communication skills and track record of coordination across engineering and research teams.
Deep experience operating production cloud services at scale (e.g., public cloud platforms, internal cloud services).
Background in distributed training frameworks and how infrastructure failures surface in training behavior.
Track record building checkpoint and recovery systems for long-running distributed jobs.
Expertise in Kubernetes at scale: deploying, operating, debugging, and tuning clusters handling heterogeneous GPU workloads.

Skills

distributed systems
cloud infrastructure
site reliability engineering
software development
tooling
automation
incident response
postmortems
reliability improvement
communication
coordination
operating production cloud services
distributed training frameworks
checkpoint and recovery systems
Kubernetes
GPU workloads

Location

San Francisco, California

Work Type

Onsite

Experience Level

Mid-level
Senior

Education Level

Bachelor's degree or equivalent experience

Salary/Compensations

$350,000 – $475,000 USD

Benefits

Generous health, dental, and vision benefits
Unlimited PTO
Paid parental leave
Relocation support
Visa sponsorship

About the Company

The mission of Thinking Machines is to build AI that extends human will and judgment.
We are training frontier models with Inkling, developing Tinker to let people make models their own, and crafting interfaces that broaden human-AI communication.
We believe the future worth building is human, and we're hiring people who want to build it.
Tinker is our fine-tuning API that empowers researchers and developers to customize frontier AI to their needs — opening access to capabilities that have previously been concentrated in a handful of labs.
We manage the infrastructure while allowing Tinkerers full flexibility in training open weights models with their own data, algorithms, and for their own needs.
Tinker is rapidly adding new customers, features, and novel use-cases.
We’re hiring to grow the platform alongside the Tinker community.