Jobs in the United States

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SG
Network & Security Administrator – Korean/English Bilingual
SBT Global, Inc.
Holland, MI
- $71,000 to $110,000 USD / year
Collaborate with IT infrastructure and application teams to ensure security requirements are incorporated into system design and deployment.
Added just now
TW
Associate Software Engineer
The Walt Disney Company
Lake Buena Vista, FL
- $94,300 to $126,300 USD / year
…programs and systems, and you may interact with users to define system requirements and/or necessary…
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Senior Mechanical Engineer
The Walt Disney Company
Lake Buena Vista, FL
As a Senior Mechanical Engineer with Facilities Asset Management (FAM), you will be supporting the entire WDW Orlando property, inclusive of all FOS organizations and occasional Operating…
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M
MAINTENANCE ENGINEER - 55007751
MyFlorida
NORTH MIAMI BEACH, FL
- $118,209.59 to $152,977.11 USD / year
Working Title: MAINTENANCE ENGINEER - 55007751
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DRAINAGE DESIGNER II - 55008169
MyFlorida
FT LAUDERDALE, FL
Join FDOT and be part of the team that works as one to improve safety, enhance mobility and inspire innovation in the Florida transportation system.
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Director of Engineering
EMCOR Group
Lake Park, FL
As a full-service commercial air conditioning company, Hill York provides design build solutions, new construction, system maintenance, service, repairs, energy solutions and installation…
Added 1 min ago
Principal Electrical Engineer
Oracle
Burlington, MA
We are seeking a Principal Electrical Engineer – Server Hardware Validation to join our OCI Hardware Engineering team On-Site in Burlington, Massachusetts. This is a hands-on technical role…
Added 1 min ago
O
Principal Core Infrastructure Engineer
Oracle
United States
- $114,600 to $234,600 USD / year
As a Senior Core Infrastructure Engineer, you will play a critical role in the pre-sales, designing, implementing, and maintaining the infrastructure that supports our customers AI and…
Added 1 min ago
Healthcare Engineer
Veterans Affairs, Veterans Health Administration
Bay Pines, FL
Added 1 min ago
Principal Quality Engineer/Sr. Principal Quality Engineer 3/4
Northrop Grumman
Apopka, FL
Northrop Grumman Mission Systems (NGMS) is looking for a Principal Quality Engineer / Sr. Principal Quality Engineer to support the Quality and Mission Assurance team located in Apopka, FL…
Added 1 min ago
Electrical Engineer DSP/RF- Mid Level
Zel Technologies
Cape Canaveral, FL
The Electrical Engineer will provide on-site problem-solving skills in areas such as electronics and circuit theory to support REPD at Cape Canaveral Space Force Station (CCAFS), Florida.…
Added 1 min ago
AE
Campus Undergraduate Summer Internship Program - 2027 Data Engineer, Enterprise Technology Services- Sunrise, FL
American Express
Sunrise, FL
- $24.05 to $63 USD / hour
At American Express, we empower future technologists to learn, innovate, and make an impact from day one. As a Data Engineer Intern in Enterprise Technology Services, you’ll join a 10-week…
Added 1 min ago
Test Engineer
ACQCENTRIC INC
Huntsville, AL
AcqCentric is looking for an amazing Test Engineer to provide DOW 5000 Series Acquisition support in the Test and Evaluation (T&E) Function and requires TEMP development experience. (This…
Added 1 min ago
Construction Supervisor - Ft Pierce
NextEra Energy
Fort Pierce, FL
Coordination of clearance planning and OSM (outage system) request to facilitate execution of projects
Added 1 min ago
M
CONTRACT SUPPORT SPECIALIST I - 55007169
MyFlorida
FORT PIERCE, FL
- $56,031.56 USD / year
Join FDOT and be part of the team that works as one to improve safety, enhance mobility and inspire innovation in the Florida transportation system.
Added 1 min ago
Senior Associate, Electrical Engineering - Power Supply Design Engineer
L3Harris
Palm Bay, FL
L3Harris in Palm Bay, Florida currently has an opening for a Power Supply Design Engineer. In this role, you will develop power supply circuits for data acquisition and computing systems.…
Added 1 min ago
Senior Scientist, Mechanical Engineer
L3Harris
Palm Bay, FL
Job Title: Senior Scientist, Mechanical Engineer
Added 1 min ago
Senior Specialist, Systems Engineering (Optical)
L3Harris
Palm Bay, FL
The Optical Systems Engineer will support the program team performing critical functions such as requirements management, interface management, system design, risk and opportunity…
Added 1 min ago
Defense Cyber Operations Engineer (On-Site Cocoa Beach, FL)
Deloitte
Lake Mary, FL
As a Defense Cyber Operations Engineer SME on our Enterprise Security team, you will be responsible for...
Added 1 min ago
Lead Software Delivery Engineer
GE Vernova
Clearwater, FL
…GE Grid Solutions is looking for a Software Project Delivery Engineer…
Added 1 min ago
Principal/Senior Principal Engineer Electronics - Avionics Radar (Melbourne FL)
Northrop Grumman
Melbourne, FL
A successful Avionics Radar Engineer has good leadership skills with a good understanding of Radar System Principles, Signal Processing, and RF Wave Propagation principles. The Avionics…
Added 1 min ago
Engineer or Principal Engineer - Fluid Subsystems Design
Northrop Grumman
Melbourne, FL
Northrop Grumman Aeronautics Systems has an opening for an Aeronautical Engineer, specializing in Fluid Subsystems design . This role will be located in Melbourne, FL .
Added 1 min ago
Senior, System Administrator (TS/SCI Needed)
L3Harris
Melbourne, FL
Job Title: Specialist, Cyber Infrastructure Systems Engineer (System Administration)
Added 1 min ago
Principal or Sr. Principal Engineer Aeronautical - Crew and Equipment Design
Northrop Grumman
Melbourne, FL
Northrop Grumman Aeronautics Systems sector is looking for a Principal Crew and Equipment Design Engineer / Sr. Principal Crew and Equipment Design Engineer with experience in Design and…
Added 1 min ago
Sr. Principal System Safety Engineer
Northrop Grumman
Melbourne, FL
Northrop Grumman Aerospace Systems is seeking a Sr. System Safety Engineer to support the B-2 program in either Palmdale, CA, Melbourne, FL, Rancho Bernardo, CA or Oklahoma City, OK.

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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