Jobs in the United States

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Added 1 min ago
EC
Lead Change Coordinator Engineer
Eaton Corporation
Sumter, SC
- $97,000 to $143,000 USD / year
Eaton’s Commercial Products and Assemblies (CPA) division is currently seeking a Lead Change Coordinator Engineer to join our team. This position is based at our Sumter, SC facility.…
Added 1 min ago
CI
ESS Design Engineer – Secret Clearance | Remote
Cambridge International Systems Inc
Charleston, SC
- $90,000 to $110,000 USD / year
We are currently seeking a ESS Design Engineer to support operations in Charleston, SC, with an opportunity to travel to locations such as Djibouti and Italy. This is a full-time,…
Added 1 min ago
EC
Senior Sustaining Electrical Engineer
Eaton Corporation
Duncan, SC
- $86,000 to $126,000 USD / year
Support customer service product inquiries. Read and interpret internal, industrial and customer product specifications and make recommendations for enhancements based on engineering…
Added 24 mins ago
C
Senior Opto-Mechanical Engineer (Quantum Computing)
ColdQuanta
Louisville, CO
- $155,000 to $185,000 USD / year
Within Infleqtion’s Quantum Computing Product Group, the Hardware Engineering Team seeks a Senior Opto-Mechanical Engineer as a senior designer responsible for the realization of precision…
Added 24 mins ago
C
Senior Opto-Mechanical Engineer (Quantum Computing)
ColdQuanta
Boulder, CO
- $155,000 to $185,000 USD / year
Within Infleqtion’s Quantum Computing Product Group, the Hardware Engineering Team seeks a Senior Opto-Mechanical Engineer as a senior designer responsible for the realization of precision…
Added 24 mins ago
Staff Software Engineer, AI Solutions
Visa USA Inc
Denver, CO
Added 1 hour ago
Quality Engineer
Tenneco
Seward, NE
With a product portfolio as expansive as it is innovative, an obsessive commitment to quality and excellence, and a global presence, we’re all about getting stuff done, so we can win.
Added 1 hour ago
Ergonomist / Occupational Safety Engineer, BlueOval Battery Park Michigan
Ford Motor Company
Marshall, MI
use your entrepreneurial skills and team mindset to come up with data-driven solutions
Added 1 hour ago
Process Quality Engineer, Process Quality Control, BlueOval Battery Park Michigan
Ford Motor Company
Marshall, MI
use your entrepreneurial skills and team mindset to come up with data-driven solutions
Added 1 hour ago
Software Engineer III - Guidewire (ClaimCenter)
AF Group
Kalamazoo, MI
…systems by being aware of obsolescence and release dates for the product per the System Development Lifecycle.n * Review patch and upgrade information and ensure implementation where…
Added 1 hour ago
Development Engineer II
Roush Enterprises
Livonia, MI
At Roush, we fuse technology and engineering to provide product development solutions to customers in a diverse range of industries. Widely recognized for providing engineering, testing,…
Added 1 hour ago
Powertrain Test Engineer I
Roush Enterprises
Dearborn, MI
Added 1 hour ago
Laser Welding Engineer
Ford Motor Company
Dearborn, MI
…our future electric vehicles. We are seeking a Laser Welding Engineer to develop, industrialize, and optimize laser joining processes between battery cell cans and busbar/current collector…
Added 1 hour ago
Product Development Engineer - Heat Exchanger Core Engineer
Ford Motor Company
Dearborn, MI
The D&R Engineer is responsible for managing product release CAD and BOM structures, including assembly positioning and mass attribute analysis. This role also includes facilitating…
Added 1 hour ago
Launch Process Engineer
Ford Motor Company
Dearborn, MI
Collaborate with Product Development team to generate facility & tooling costs, improve quality, and reduce labor requirements.
Added 1 hour ago
HV Battery NVH/Durability CAE Engineer
Ford Motor Company
Dearborn, MI
We are looking for an experienced structures CAE engineer to lead High Voltage battery internals and related system structural design using CAE tools. You will work with battery design &…
Added 1 hour ago
KC
Product Development Engineer Intern
KLATencor Corporation
Ann Arbor, MI
- $56 USD / hour
…Customers (Semi PC) business unit designs, builds and sells KLA's product portfolio to help chip manufacturers meet high-quality standards for technologies like AI, data centers, automotive…
Added 1 hour ago
Quality Assurance Engineer
Anu Software Consultants, Inc.
Ann Arbor, MI
…input on functional requirements, operational characteristics, product designs, and schedules. Monitor computer system performance to ensure proper operation. Develop performance metrics or…
Added 1 hour ago
Software Engineer III - Guidewire (ClaimCenter)
AF Group
Lansing, MI
…systems by being aware of obsolescence and release dates for the product per the System Development Lifecycle.n * Review patch and upgrade information and ensure implementation where…
Added 1 hour ago
Model-Based Systems Engineer - Digital Transformation
Ford Motor Company
Dearborn, MI
…Expand cross-tool interoperability to include 2D/3D CAD design data, requirements, and CAE disciplines to enable a seamless Digital Thread across the product…
Added 1 hour ago
Product Development Engineer - Evaporator & Blower Assembly (HVAC) Core Engineer
Ford Motor Company
Dearborn, MI
The D&R Engineer is responsible for managing product release CAD and BOM structures, including assembly positioning and mass attribute analysis. This role also includes facilitating…
Added 2 hours ago
Senior Product Quality Engineer
Micron Technology, Inc.
Boise, ID
Our Product Quality Engineering team supports manufacturing excellence across our Boise fab. We work closely with partners across the factory to supervise product performance, drive process…
Added 2 hours ago
EC
Regional Application Engineer
Eaton Corporation
Boise, ID
- $99,000 to $145,000 USD / year
Eaton’s Global Energy Infrastructure Solutions (GEIS) division is currently seeking a Regional Application Engineer supporting the commercial and industrial markets as part of the Regional…
Added 4 hours ago
IC
AI Silicon Performance Modeling and Analysis Engineer
Intel Corporation
CA
- $141,910 to $232,190 USD / year
We are seeking a highly experienced and motivated engineer to drive AI silicon performance modeling, validation, architectural analysis, and stakeholder engagement activities. The candidate…
Added 6 hours ago
Software Engineer, Platform Infrastructure
Axiom
South San Francisco, CA
- Build and operate the shared infrastructure behind Axiom’s scientific data pipelines, AI agents, research workflows, and Translate product.

Circle

Lead Engineer, AI Platform

Remote, United States

$170,000 USD / year

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Job details

Pay: $170,000 USD / year
Experience: 7+ years of experience building and shipping production software, ideally including LLM-powered agents that take real actions in a product.
Posting language: English
Posted: Oct 30, 2026

Original job description

ABOUT US

Circle is building the world’s leading AI-powered, all-in-one platform for digital businesses. We make it possible for creators, coaches, educators, and businesses to bring together their audience with engaging discussions, live streams, events, chat, courses, and payments - all in one place, all under their own brand.

We’re proud to be a fully remote company of around 270 (and growing!) team members from 30+ countries around the world. We seek exceptional individuals around the world, set them up to do the best work of their lives, and in turn, create a meaningful impact in their own lives. We don't track hours, but we do manage for high expectations very closely. We collaborate across time zones, are highly async, and like to document a lot.

Every year, we bring the whole company together in beautiful places around the world for our company offsites. So far, we’ve hosted offsites in Turkey, Portugal, Mexico, Thailand, Colombia, Italy, Ireland, and more, with still more to come!

Check out our Careers https://careers.circle.so/ page for more about working at Circle.

ABOUT THE ROLE

The AI Quality engineering team at Circle owns the foundation for measuring, diagnosing, and improving the quality of Circle's AI-powered features. This team focuses on building the infrastructure to measure, diagnose, and improve production AI systems, rather than ML research or model training.

We're looking for a Lead Engineer to help us build out the evaluation frameworks, observability tooling, and diagnostic infrastructure that tell us whether our AI Agents are working well, where to improve them, and how to make them faster and more cost-efficient.

This is a hands-on player-coach role. You’ll also lead and manage the AI Quality engineering team, with an ambitious and growing roadmap.

If you're excited about making AI systems work reliably, efficiently, and at scale, this is for you.

WHAT YOU'LL BE DOING

Build and own our evaluation infrastructure. Design the CI/CD pipelines, scorers, and datasets that tell us whether Circle's AI agents (planners, tool-callers, and sub-agents) are actually working, from a single tool call to a full multi-turn conversation.
Diagnose exactly where quality breaks down. Trace failures across the agent pipeline including plan creation vs. execution, tool selection, tool trajectory in complex areas like workflows, site builder, and analytics. Turn what you find into prototypes that solve the issue or identify priorities for AI core engineering can help.
Grow the datasets that make evaluation possible. Stand up annotation workflows and build out AI-generated and simulated conversations so we can cover more of the product faster than manual labeling alone.
Run structured experiments across prompts, models, and the agent harness. Evaluate new and open-source models against our production baseline, build the framework we use to decide when to shift models, and chase cost and latency wins through model swaps, caching, and routing by plan complexity.
Lead and grow the AI Quality engineering team. Set technical direction and manage day-to-day priorities, all while staying hands-on in the code yourself.
Partner closely with AI Core engineering. Work with the engineers building Circle's AI products so they have real confidence that their changes are actually improving quality, not just shipping.

WHAT YOU'LL NEED TO BE SUCCESSFUL

7+ years of experience building and shipping production software, ideally including LLM-powered agents that take real actions in a product. You've worked on complex, tool-using systems (multiple tools, planning or orchestration, sub-agents) not just simple, single-turn assistants, and you can walk us through something you shipped and how you knew it was actually working.
Comfortable in Ruby on Rails / Python or ready to pick them up quickly. Ruby on Rails is our production system and the foundation that Circle’s AI Agents are built on and proficiency in Python is a strong plus, especially for the data and evaluation side of the work.
Experience building evaluation or observability infrastructure for ML/AI systems. You've built eval pipelines, scorers, dashboards, or CI/CD for evals before and have experience with evaluation frameworks like Braintrust, LangSmith, or similar.
Experience designing datasets, annotation workflows, or labeling pipelines for ML/AI evaluation. You know how to turn raw examples into a dataset you can trust through human annotation, AI-generated data, or simulation.
Learn fast, experiment aggressively, and thrive in a highly dynamic environment. You’ll need to be comfortable running a lot of experiments and letting the results settle the argument, including the ones that don't work (which will be many of them in the beginning).
Comfortable in a fast-paced environment with ambiguity. You’ll need to learn and pick up new technologies when projects require it.
Strong alignment with our company values https://circle.so/careers.
You are proficient in English (spoken, written, and reading) at a CEFR Level C2 https://magoosh.com/english-speaking/english-proficiency-levels-a-guide-to-determining-your-level/ / ILR Level 5 https://www.govtilr.org/.

COMPENSATION & BENEFITS

Circle offers U.S.-benchmarked compensation globally, equity in the company with ongoing refresh grants, and 35 days of paid time off each year.

We’re a remote-only team that comes together twice a year for company retreats in incredible destinations around the world. Alongside incredible flexibility and autonomy, we offer a benefits package that supports health, wellbeing, and professional growth. Learn more in our Candidate Hub. https://circleco.notion.site/circle-candidate-hub

LEARN MORE

Candidate Safety & Interview Process Notice https://app.notion.com/p/circleco/Circle-Candidate-Hub-374b655313b7803d9580fb7da4f51acf?source=copy_link#374b655313b780e5b681c4d56b962790
Diversity, Equity & Inclusion https://app.notion.com/p/circleco/Circle-Candidate-Hub-374b655313b7803d9580fb7da4f51acf?source=copy_link#374b655313b7807a8e3ff5c25a1d93ba
How We Use Candidate Data https://app.notion.com/p/circleco/Circle-Candidate-Hub-374b655313b7803d9580fb7da4f51acf?source=copy_link#374b655313b780e49e98f390eec6bb51
Equal Employment Opportunity https://app.notion.com/p/circleco/Circle-Candidate-Hub-374b655313b7803d9580fb7da4f51acf?source=copy_link#374b655313b7807a967dea67e68f31f0
Visit our Candidate Hub https://circleco.notion.site/circle-candidate-hub to learn more about working at Circle, our benefits, and our hiring process.

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Skills

ML
Research
CI/CD
Industrial software
Ruby on Rails
Python

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