Founding Infrastructure Engineer - Flair Labs

Flair Labs, San Francisco, California +1

Posted pay

$120K–$160K

a year

Compared with similar jobs

This base pay is below the median for infrastructure, platform and SRE jobs that are remote in the US with no level in the job title.

Median: $168K a year
Other jobs in the group: 288

We compare the middle of each posted range. This is base pay as posted. The group does not include this job.

Location: San Francisco, California +1
Work type: Remote
Level: Not given
Experience: 5+ years
Skills in the job text: Python
Go
Posted: Feb 2, 2026
Last check: 2 days ago
Job type: Infra, platform & SRE

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The role

We are looking for a talented Founding Infrastructure Engineer to help build and scale our Voice AI Agent platform—a powerful system that autonomously interacts with customers, handling millions of conversations every month. In this role, you’ll design and deliver the software that enables local businesses to manage complex customer interactions automatically, book more appointments, and serve their customers more effectively across multiple channels (e.g., voice, SMS, chat).

If you thrive in fast-paced, highly iterative environments, enjoy solving complex distributed systems challenges, and want to see your work drive immediate business impact, this role is for you!

What you will do

Build and scale the AI Agent platform – enabling high-volume, real-time conversational workflows that deliver accuracy and low latency at scale.
Design and implement APIs, services, and infrastructure that power multi-turn, cross-channel customer interactions.
Own the full lifecycle: architecture, implementation, deployment, and ongoing reliability.
Prototype rapidly, iterate with live interaction data, and continuously improve system performance and user experience.
Implement observability, monitoring, and operational best practices to ensure reliability in production, focusing on agent accuracy and latency.
Collaborate with engineers, product managers, and AI/ML scientists to deliver end-to-end features that power critical business outcomes.

What you should have

5+ years of professional software engineering experience with at least one modern language such as Go, Python, or Elixir.
1+ years of professional experience deploying and maintaining AI agents in production environments that interact with tools, APIs, or real-world workflows.
Proven success designing and maintaining distributed or high-throughput systems.
Strong problem-solving ability and comfort navigating ambiguity in large-scale systems.
Excellent communication skills and the ability to work effectively across teams.
A willingness to work across the entire stack—from infrastructure to APIs to user-facing components—wherever the problem needs solving.
Ability to thrive in a fast-paced environment with shifting priorities.

What we hope you have

1+ years of professional experience deploying and maintaining AI agents in production environments that interact with tools, APIs, or real-world workflows.
Practical experience designing and implementing evaluations for LLM behavior — including accuracy, safety, reliability, and cost monitoring.
Strong understanding of prompt design, context engineering, and guardrail strategies for dependable, interpretable agent behavior.
Experience with modern agent frameworks including multi-step reasoning, memory, and orchestration patterns.
Hands-on experience with fine-tuning and data curation for improving model performance.

Read the job posting on the Flair Labs site

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Source: the Y Combinator job board. We last checked this job 2 days ago. We first saw it 8 days ago. A job on a job board does not always mean that the team interviews people now.

Flair Labs

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Compared with similar jobs

This base pay is below the median for infrastructure, platform and SRE jobs that are remote in the US with no level in the job title.

Median: $168K a year
Other jobs in the group: 288

We compare the middle of each posted range. This is base pay as posted. The group does not include this job.