{"id":1557248,"url":"https://alion.io/job/circle-lead-engineer-ai-platform-5","title":"Lead Engineer, AI Platform","company":{"id":19316,"name":"Circle","domain":"circle.so","url":"https://alion.io/company/circle-so","size_band":"51-200","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Ashby","truth_index":null},"role":"AI/ML","role_family":"AI/ML","seniority":"lead","employment_type":"full_time","work_mode":"remote","remote_scope":"stated_regions","remote_scope_basis":"board_field","remote_working_hours":null,"hiring_geo_confidence":"inferred","locations":[],"countries":[],"hiring_countries":["PL","DE","FR","AE","GB","AT","BE","BA","BG","HR","CY","CZ","DK","EG","FI","HU","IE","IL","IT","KE","NL","NG","NO","RO","SA","RS","ZA","ES","SE","CH","TR","UA","AL","DZ","AD","AO","BH","BJ","BW","BF"],"hiring_countries_total":115,"salary":{"min":170000,"max":170000,"currency":"USD","period":"year","gross":null,"usd_annual":170000},"salary_estimate":null,"experience_years_min":7,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"AI Agents","optional":false},{"name":"Braintrust","optional":false},{"name":"CI/CD","optional":false},{"name":"LangSmith","optional":false},{"name":"LLM","optional":false},{"name":"Python","optional":false},{"name":"Ruby on Rails","optional":false},{"name":"Ruby","optional":true}],"status":"live","first_seen_at":"2026-09-30T20:46:35Z","employer_posted_date":"2026-09-30","last_verified_at":"2026-10-13T09:48:45Z","board_verified":true,"closed_at":null,"days_open":12,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":12},"description":"About Us\nCircle 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.\nWe’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.\nTwice a 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!\nCheck out our Careers page for more about working at Circle.\nAbout the role\nThe 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.\nWe'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.\nThis is a hands-on player-coach role. You’ll also lead and manage the AI Quality engineering team, with an ambitious and growing roadmap.\nIf you're excited about making AI systems work reliably, efficiently, and at scale, this is for you.\nWhat you'll be doing\nBuild 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.\n\nDiagnose 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.\n\nGrow 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.\n\nRun 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.\n\nLead 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.\n\nPartner 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.\n\nWhat you'll need to be successful\n7+ 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.\n\nComfortable 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.\n\nExperience 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.\n\nExperience 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.\n\nLearn 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).\n\nComfortable in a fast-paced environment with ambiguity. You’ll need to learn and pick up new technologies when projects require it.\n\nStrong alignment withour company values .\n\nYou are proficient in English (spoken, written, and reading) at a CEFR Level C2 / ILR Level 5.\n\nCompensation & benefits\nCircle offers U.S.-benchmarked compensation globally, equity in the company with ongoing refresh grants, and 35 days of paid time off each year.\nWe’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.\nLearn more\nCandidate Safety & Interview Process Notice\n\nDiversity, Equity & Inclusion\n\nHow We Use Candidate Data\n\nEqual Employment Opportunity\n\nVisit our Candidate Hub to learn more about working at Circle, our benefits, and our hiring process.","description_format":"text","description_chars":5735,"description_truncated":false,"requirements":{"experience_years_min":7,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[{"language":"English","level":"Advanced (C1)","optional":false}]},"benefits":["Equity"],"hiring_locations":[{"name":"Poland","iso":"PL","kind":"country"},{"name":"Germany","iso":"DE","kind":"region"},{"name":"France","iso":"FR","kind":"region"},{"name":"United Arab Emirates","iso":"AE","kind":"region"},{"name":"United Kingdom","iso":"GB","kind":"region"},{"name":"Austria","iso":"AT","kind":"region"},{"name":"Belgium","iso":"BE","kind":"region"},{"name":"Bosnia and Herzegovina","iso":"BA","kind":"region"},{"name":"Bulgaria","iso":"BG","kind":"region"},{"name":"Croatia","iso":"HR","kind":"region"},{"name":"Cyprus","iso":"CY","kind":"region"},{"name":"Czech Republic","iso":"CZ","kind":"region"},{"name":"Denmark","iso":"DK","kind":"region"},{"name":"Egypt","iso":"EG","kind":"region"},{"name":"Finland","iso":"FI","kind":"region"},{"name":"Hungary","iso":"HU","kind":"region"},{"name":"Ireland","iso":"IE","kind":"region"},{"name":"Israel","iso":"IL","kind":"region"},{"name":"Italy","iso":"IT","kind":"region"},{"name":"Kenya","iso":"KE","kind":"region"},{"name":"Montenegro","iso":null,"kind":"region"},{"name":"Netherlands","iso":"NL","kind":"region"},{"name":"Nigeria","iso":"NG","kind":"region"},{"name":"Norway","iso":"NO","kind":"region"},{"name":"Romania","iso":"RO","kind":"region"},{"name":"Saudi Arabia","iso":"SA","kind":"region"},{"name":"Serbia","iso":"RS","kind":"region"},{"name":"South Africa","iso":"ZA","kind":"region"},{"name":"Spain","iso":"ES","kind":"region"},{"name":"Sweden","iso":"SE","kind":"region"},{"name":"Switzerland","iso":"CH","kind":"region"},{"name":"Turkey","iso":"TR","kind":"region"},{"name":"Ukraine","iso":"UA","kind":"region"},{"name":"Albania","iso":"AL","kind":"region"},{"name":"Algeria","iso":"DZ","kind":"region"},{"name":"Andorra","iso":"AD","kind":"region"},{"name":"Angola","iso":"AO","kind":"region"},{"name":"Bahrain","iso":"BH","kind":"region"},{"name":"Benin","iso":"BJ","kind":"region"},{"name":"Botswana","iso":"BW","kind":"region"},{"name":"Burkina Faso","iso":"BF","kind":"region"},{"name":"Burundi","iso":"BI","kind":"region"},{"name":"Cameroon","iso":"CM","kind":"region"},{"name":"Cape Verde","iso":"CV","kind":"region"},{"name":"Chad","iso":"TD","kind":"region"},{"name":"Central African Republic","iso":"CF","kind":"region"},{"name":"Comoros","iso":"KM","kind":"region"},{"name":"Democratic Republic of the Congo","iso":"CD","kind":"region"},{"name":"Djibouti","iso":"DJ","kind":"region"},{"name":"Equatorial Guinea","iso":"GQ","kind":"region"},{"name":"Eritrea","iso":"ER","kind":"region"},{"name":"Estonia","iso":"EE","kind":"region"},{"name":"Eswatini","iso":"SZ","kind":"region"},{"name":"Ethiopia","iso":"ET","kind":"region"},{"name":"Faroe Islands","iso":"FO","kind":"region"},{"name":"Gabon","iso":"GA","kind":"region"},{"name":"Gambia","iso":"GM","kind":"region"},{"name":"Georgia","iso":"GE","kind":"region"},{"name":"Ghana","iso":"GH","kind":"region"},{"name":"Greece","iso":"GR","kind":"region"},{"name":"Guinea","iso":"GN","kind":"region"},{"name":"Guinea-Bissau","iso":"GW","kind":"region"},{"name":"Iceland","iso":"IS","kind":"region"},{"name":"Iraq","iso":"IQ","kind":"region"},{"name":"Isle of Man","iso":"IM","kind":"region"},{"name":"Ivory Coast","iso":"CI","kind":"region"},{"name":"Jordan","iso":"JO","kind":"region"},{"name":"Kosovo","iso":null,"kind":"region"},{"name":"Kuwait","iso":"KW","kind":"region"},{"name":"Latvia","iso":"LV","kind":"region"},{"name":"Lebanon","iso":"LB","kind":"region"},{"name":"Lesotho","iso":"LS","kind":"region"},{"name":"Liberia","iso":"LR","kind":"region"},{"name":"Liechtenstein","iso":"LI","kind":"region"},{"name":"Lithuania","iso":"LT","kind":"region"},{"name":"Luxembourg","iso":"LU","kind":"region"},{"name":"Madagascar","iso":"MG","kind":"region"},{"name":"Malawi","iso":"MW","kind":"region"},{"name":"Mali","iso":"ML","kind":"region"},{"name":"Malta","iso":"MT","kind":"region"},{"name":"Mauritania","iso":"MR","kind":"region"},{"name":"Mauritius","iso":"MU","kind":"region"},{"name":"Mayotte","iso":"YT","kind":"region"},{"name":"Moldova","iso":"MD","kind":"region"},{"name":"Monaco","iso":"MC","kind":"region"},{"name":"Morocco","iso":"MA","kind":"region"},{"name":"Mozambique","iso":"MZ","kind":"region"},{"name":"Namibia","iso":"NA","kind":"region"},{"name":"Niger","iso":"NE","kind":"region"},{"name":"North Macedonia","iso":"MK","kind":"region"},{"name":"Oman","iso":"OM","kind":"region"},{"name":"Palestine","iso":"PS","kind":"region"},{"name":"Portugal","iso":"PT","kind":"region"},{"name":"Qatar","iso":"QA","kind":"region"},{"name":"Republic of the Congo","iso":"CG","kind":"region"},{"name":"Réunion","iso":"RE","kind":"region"},{"name":"Rwanda","iso":"RW","kind":"region"},{"name":"Saint Helena and Ascension","iso":"SH","kind":"region"},{"name":"San Marino","iso":"SM","kind":"region"},{"name":"São Tomé and Príncipe","iso":"ST","kind":"region"},{"name":"Senegal","iso":"SN","kind":"region"},{"name":"Seychelles","iso":"SC","kind":"region"},{"name":"Sierra Leone","iso":"SL","kind":"region"},{"name":"Slovakia","iso":"SK","kind":"region"},{"name":"Slovenia","iso":"SI","kind":"region"},{"name":"Somalia","iso":"SO","kind":"region"},{"name":"South Sudan","iso":"SS","kind":"region"},{"name":"Svalbard","iso":"SJ","kind":"region"},{"name":"Tanzania","iso":"TZ","kind":"region"},{"name":"Togo","iso":"TG","kind":"region"},{"name":"Tunisia","iso":"TN","kind":"region"},{"name":"Uganda","iso":"UG","kind":"region"},{"name":"Western Sahara","iso":"EH","kind":"region"},{"name":"Zambia","iso":"ZM","kind":"region"},{"name":"Zimbabwe","iso":"ZW","kind":"region"},{"name":"Gibraltar","iso":"GI","kind":"region"},{"name":"Vatican","iso":"VA","kind":"region"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Lifestyle","Smart Home Devices","Internet Security Services"],"lifecycle":[{"event":"open","at":"2026-10-01T02:30:47Z"}],"visa":[],"liveness":{"score":38,"band":"fade","label":"Fading","p_open":1,"p_active":0.842,"p_room":0.45,"age_days":12,"expected_fill_days":7,"reasons":["conf:2","wave","velocity","win:tail"],"computed_at":"2026-10-13T05:45:00Z"},"pay":{"stated_usd_annual":170000,"is_top_pay":false},"html_url":"https://alion.io/job/circle-lead-engineer-ai-platform-5","json_url":"https://alion.io/job/circle-lead-engineer-ai-platform-5.json","meta":{"generated_at":"2026-10-13T12:04:29Z","cache_seconds":300,"methodology":"https://alion.io/methodology","terms":"https://alion.io/terms","contact":"https://alion.io/contact","api":"https://alion.io/developers","about":"Alion is a live layer of people, companies and AI agents: who they are, whether they are real and active right now, what they do and how to work with them, readable by people and by agents and paid per call.","catalog":"https://alion.io/catalog.json","usage":{"tier":"crawler_verified","counted_by":"address","units_charged":1,"used_today":18806,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-14T00:00:00Z"}},"offers":[{"id":"company.slices","title":"One company in depth, by slice","status":"live","price":{"credits":0.02,"usd":0.002,"plus_per_slice":{"credits":0.05,"usd":0.005}},"unit":"per company, plus each slice with data","note":"the employer in depth","call":{"mcp_tool":"get_company","arguments":{"id":19316},"rest":"https://alion.io/mcp/rest/get_company?id=19316"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fcircle-lead-engineer-ai-platform-5"},{"id":"market.stats","title":"A market slice: pay, demand and time to fill","status":"live","price":{"credits":1,"usd":0.1},"unit":"per slice","note":"pay, demand and time to fill for this role and place","call":{"mcp_tool":"market_stats"},"human":"https://alion.io/catalog?offer=market.stats&for=job%2Fcircle-lead-engineer-ai-platform-5"},{"id":"job.search","title":"Open jobs by role, technology, place, pay and visa","status":"live","price":{"credits":0.02,"usd":0.002},"unit":"per posting in a list","note":"similar open postings","call":{"mcp_tool":"search_jobs"},"human":"https://alion.io/catalog?offer=job.search&for=job%2Fcircle-lead-engineer-ai-platform-5"},{"id":"company.verify","title":"Is this company real and active right now","status":"pilot","price":null,"unit":"per company","request":{"url":"https://alion.io/catalog/request","method":"POST","body":"{\"offer\": \"company.verify\", \"for\": \"job/circle-lead-engineer-ai-platform-5\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fcircle-lead-engineer-ai-platform-5"}]}