Site Reliability Engineer, Production

Mosaic.tech; San Francisco (CA); On-site; USD 350,000 - 475,000; Full time

Benefits offered by this job

Health, dental, and vision benefits

Unlimited PTO

Parental leave

Relocation support

Job summary

Thinking Machines is seeking a Site Reliability Engineer to drive the reliability of Tinker end-to-end. You will work alongside the platform and research teams to make every layer of the system more robust and resilient.

You will define and own end-to-end reliability, develop SLOs for distributed training systems, and design monitoring and incident response across the full training path, ensuring secure, multi-tenant operation at scale.

Qualifications

• Bachelor's degree or equivalent in CS/Engineering or related field.
• Experience in distributed systems, cloud infrastructure, or site reliability engineering.
• Proficiency writing software to solve reliability problems, including tooling and automation.
• Experience with production incident response, postmortems, and systematic reliability improvement.
• Strong communication and coordination across engineering and research teams.

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 and thorough incident reviews.
• Harden multi-tenant isolation and resource scheduling for efficient, reliable GPU workloads; collaborate with security teams.

Skills

Distributed systems

Cloud infrastructure

Software tooling & automation

Incident response

Cross-team collaboration

Education

Bachelor's degree or equivalent

Tools

Kubernetes

Cloud platforms

Job description

About Thinking Machines

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.

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.

About Tinker

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.

What You’ll Do

• 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

Skills and Qualifications

Minimum qualifications

• 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.

Preferred qualifications

• 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.

Logistics

• Location: This role is based in San Francisco, California.

• Compensation: Depending on background, skills and experience, the expected annual salary range for this position is $350,000 – $475,000 USD.

• Visa sponsorship: We sponsor visas. While we can't guarantee success for every candidate or role, if you're the right fit, we're committed to working through the visa process together.

• Benefits: Thinking Machines offers generous health, dental, and vision benefits, unlimited PTO, paid parental leave, and relocation support as needed.