on-call
(8)
Corelayer
Corelayer is an AI-native production support platform - an 'AI on-call engineer' - built for regulated, data-heavy industries like finance, healthcare, and insurance. It continuously watches alerts, logs, infrastructure, and the underlying data itself, then uses multi-agent AI to trace anomalies to root cause and suggest fixes. Founded in 2025 by former Goldman Sachs data-infrastructure engineers Mitch Radhuber and Shipra Jha, the company is part of Y Combinator's Winter 2026 batch.
Exla
Exla (YC W25) is a San Francisco startup building Libra, an AI site-reliability engineer that watches production logs, traces and deploys around the clock. When something breaks, Libra detects the failure, finds the deploy that caused it, opens a fix pull request with a regression test, and verifies recovery in production - so engineers do not have to wake up at 3am. The company began as an SDK for running large transformer models on edge devices and pivoted to autonomous incident response.
Sonarly
Sonarly is a San Francisco startup (Y Combinator W26) building an autonomous AI on-call engineer for production software. It wires into a company's monitoring stack - Sentry, Datadog, Grafana, Slack and more - triages every alert to strip out noise and duplicates, investigates logs, traces, metrics and code to find the root cause, and opens a ready-to-merge fix pull request before a human engineer is paged. Founded by Dimittri Choudhury and Alexandre Klobb, who previously scaled an edtech app to 100k+ users, Sonarly aims to cut Mean Time To Repair by handling the 3am pages that engineers dread.
Vespper
Vespper (YC F24) builds infrastructure that lets AI agents produce real Microsoft Word documents. Its product is a docx MCP (Model Context Protocol) server that turns raw agent output into clean, tracked, review-ready .docx files - aimed at regulated, legal, and compliance workflows where the final artifact has to be a Word doc with tracked changes, not a chat window. The two-person, Tel Aviv-based team originally launched an open-source, 24/7 AI on-call engineer for incident triage before pivoting into agent document infrastructure.
Vibranium Labs
Vibranium Labs is a New York-based AI company building Vibe AI, an agentic 'AI Site Reliability Engineer' that acts as the first responder to IT incidents. Its Vibe OnCall platform pages AI agents to detect, triage, and resolve outages before human engineers are woken up, integrating with tools like Slack, PagerDuty, Datadog, Jira, and ServiceNow. The company says its agents cut mean time to resolution by up to 85%, and positions itself as an AI-native alternative to PagerDuty and Opsgenie. Founded by Sang Lee (ex-Google, ex-AWS) with FiscalNote co-founder Tim Hwang, it raised $4.6M in seed funding in September 2025.
Sang Lee
Sang Lee is the co-founder and CEO of Vibranium Labs, a New York startup building Vibe AI, billed as the first 24/7 AI site reliability engineer. A former Google and AWS engineer who lived through too many 2 a.m. outage firefights, Lee is building an agentic AI teammate that detects, triages, and resolves IT incidents before a human ever wakes up. In September 2025 the company raised $4.6M in seed funding led by Calibrate Ventures and Mirae Asset, with backing from a16z, Franklin Templeton, and others, claiming up to an 85% cut in mean time to resolution and counting Shutterstock among its clients.
Resolve AI
Resolve AI builds an agentic AI Production Engineer that handles alerts, investigates incidents, and performs root cause analysis on production systems - reducing on-call toil for engineering teams at companies like DoorDash, Coinbase, and Snowflake.
Andrew Miklas
Andrew Miklas co-founded PagerDuty with two Amazon colleagues in 2009, built the original high-availability architecture as founding CTO, and shepherded the company from a Hacker News beta post to a $1.8B NYSE IPO. After a stint as an early-stage investor at s28 Capital, he returned to Y Combinator - where PagerDuty got its start in the Summer 2010 batch - as a General Partner in May 2025, fifteen years after first walking through YC's doors as a founder.