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Sr Quality Engineer
Twenty-Six Defense
Fort Worth, TX
…United States. Twenty-Six Defense is wholly owned by Elbit Systems Ltd. (NASDAQ: ESLT and TASE: ESLT), a global high-technology company engaged in a wide range of programs for innovative…
Added 1 min ago
Sr. Engineering Program Director, Quality Strategy & Investigation Excellence
Medtronic
North Haven, CT
Plans, directs and implements all aspects of the company's design and development of new medical device products or software systems.
Added 1 min ago
Sr Technical Writer
Medtronic
North Haven, CT
3-5 years’ experience working with complex hardware and software systems.
Added 1 min ago
Mechanical Manufacturing Engineer
Butler America
Windsor Locks, CT
The Mechanical Manufacturing Engineer will contribute to the production of highly sophisticated assemblies for Space and Sea applications, including heat exchangers, pumps, fans, and…
Added 1 min ago
Quality Engineer - 1st & 2nd Shift
Insight Global
East Hartford, CT
Insight Global is seeking a 1st & 2nd shift Quality Engineer to support manufacturing operations within a union shop floor environment. This role is responsible for managing quality holds,…
Added 1 min ago
AI Solutions Architect - Life Sciences
Deloitte
Stamford, CT
…deploy, and operate integrated/verticalized sector solutions in software, data, AI, network, and hybrid cloud infrastructure. These solutions are powered by engineering for business…
Added 1 min ago
AI & Data AVP, Manufacturing (Life Sciences/Pharma)
Deloitte
Stamford, CT
…deploy, and operate integrated/verticalized sector solutions in software, data, AI, network, and hybrid cloud infrastructure. These solutions are powered by engineering for business…
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Agentic AI Engineer, Senior
Deloitte
Stamford, CT
…deploy, and operate integrated/verticalized sector solutions in software, data, AI, network, and hybrid cloud infrastructure. These solutions are powered by engineering for business…
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Agentic AI Engineer, Senior - Anthropic/Claude
Deloitte
Stamford, CT
…that shift: designing and building autonomous, multi-agent systems powered by Anthropic's Claude models for some of the world's largest…
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Agentic AI Engineer - Anthropic/Claude
Deloitte
Stamford, CT
…that shift: designing and building autonomous, multi-agent systems powered by Anthropic's Claude models for some of the world's largest…
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Software Engineer - Product (Technical Leadership)
Meta
Hartford, CT
Software Engineer - Product (Technical Leadership) Responsibilities:
Added 1 min ago
Data Engineer
Deloitte
Stamford, CT · Hartford, CT
…work in a collaborative environment? As an experienced Data Engineer you will have the ability to share new ideas and collaborate on projects as a consultant without the extensive demands…
Added 1 min ago
Senior Forward Deployed Engineer, Microsoft AI&Data
Deloitte
Stamford, CT · Hartford, CT
…practitioner who moves with speed and precision, building working software, engaging confidently with senior stakeholders and engineers to bring measurable business impact from day one.…
Added 1 min ago
Senior Forward Deployed Engineer, Palantir
Deloitte
Stamford, CT · Hartford, CT
…practitioner who moves with speed and precision, building working software, engaging confidently with senior stakeholders and engineers to bring measurable business impact from day one.…
Added 1 min ago
Lead Forward Deployed Engineer, Microsoft AI & Data
Deloitte
Stamford, CT · Hartford, CT
…blockers, and stay hands-on; designing, reviewing, and debugging systems with the team. You'll translate engineering trade-offs into clear decisions for client leaders when needed. Your…
Added 1 min ago
Forward Deployed Engineer, Frontier GenAI
Deloitte
Hartford, CT · Stamford, CT
…practitioner who moves with speed and precision, building working software, engaging confidently with senior stakeholders and engineers to bring measurable business impact from day one.…
Added 1 min ago
Forward Deployed Engineer, Microsoft AI & Data
Deloitte
Stamford, CT · Hartford, CT
…practitioner who moves with speed and precision, building working software, engaging confidently with senior stakeholders and engineers to bring measurable business impact from day one.…
Added 1 min ago
Lead Forward Deployed Engineer, Palantir
Deloitte
Hartford, CT · Stamford, CT
…blockers, and stay hands-on; designing, reviewing, and debugging systems with the team. You'll translate engineering trade-offs into clear decisions for client leaders when needed. Your…
Added 1 min ago
Forward Deployed Engineer- Palantir
Deloitte
Hartford, CT · Stamford, CT
…practitioner who moves with speed and precision, building working software, engaging confidently with senior stakeholders and engineers to bring measurable business impact from day one.…
Added 1 min ago
Senior Forward Deployed Engineer, Frontier GenAI
Deloitte
Hartford, CT · Stamford, CT
…practitioner who moves with speed and precision, building working software, engaging confidently with senior stakeholders and engineers to bring measurable business impact from day one.…
Added 1 min ago
Lead Forward Deployed Engineer, Frontier GenAI
Deloitte
Stamford, CT · Hartford, CT
…blockers, and stay hands-on; designing, reviewing, and debugging systems with the team. You'll translate engineering trade-offs into clear decisions for client leaders when needed. Your…
Added 1 min ago
Forward Deployed Engineer- ServiceNow
Deloitte
Hartford, CT · Stamford, CT
…practitioner who moves with speed and precision, building working software, engaging confidently with senior stakeholders and engineers to bring measurable business impact from day one.…
Added 1 min ago
Senior Forward Deployed Engineer, ServiceNow
Deloitte
Hartford, CT · Stamford, CT
…practitioner who moves with speed and precision, building working software, engaging confidently with senior stakeholders and engineers to bring measurable business impact from day one.…
Added 1 min ago
Lead Forward Deployed Engineer, ServiceNow
Deloitte
Hartford, CT · Stamford, CT
…blockers, and stay hands-on; designing, reviewing, and debugging systems with the team. You'll translate engineering trade-offs into clear decisions for client leaders when needed. Your…
Added 1 min ago
Senior Platform Engineer - NBA
Humana
Hartford, CT
The Senior Platform Engineer keeps the entire NBA platform healthy, reliable, and maintainable for the long term. You develop a working understanding of every layer of the technology stack…

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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