Get an API keyGet an API key11 Y Combinator companies with a founder who worked at Atlassian before.
Updated weekly, last on November 9, 2026. Roster from Y Combinator's public directory.
CaddyF25
Bolna AI+59%Bolna AIF25| Company | Batch | Team | 6 mo | 12 mo | Open roles | Total raised | Last round |
|---|---|---|---|---|---|---|---|
Voice AI to enable India's next billion | F25 | 62 | +59% | +377% | YC | $6.4M | Seed$6.3M, Jan 2026 |
Your Personal AI for everyday work. Lives in your texts. | F25 | 13 | +86% | 0 | $500K | YC investment$500K, Dec 2025 | |
 Cloud Development Environments with one click | W19 | 13 | −13% | −19% | YC | $18.1M | Series A$15M, Jan 2022 |
 Make real life a video game | X25 | 7 | −12% | −12% | 0 | $500K | YC investment$500K, Jan 2026 |
 AI prototyping tool for product managers | W23 | 7 | −12% | −22% | 0 | $2.7M | Seed$2.2M, Feb 2025 |
 Helping rehab practices book more patients | S23 | 6 | 0% | −25% | 0 | $500K | YC investment$500K, Aug 2023 |
 The AI OS for Cities | S25 | 5 | −29% | YC | $500K | YC investment$500K, Aug 2025 | |
 AI that automatically improves products from user behavior | W26 | 4 | 0 | $1.3M | Pre-seed (before YC)$1.3M, Oct 2025 | ||
 Global payment gateway to buy/sell crypto | S22Inactive | 2 | 0 | $500K | YC investment$500K, Aug 2022 | ||
 AI Code Review tool that runs your app | S24 | 1 | 0 | $500K | YC investment$500K, Sep 2024 | ||
 AI-native operating system for analytics teams | W23Inactive | 1 | 0 | $500K | YC investment$500K, Apr 2023 |
Every launched company in YC's public directory, with its batch, status, industry and location. New companies show up the week YC lists them.
Each company is matched to Crustdata by its website. Crustdata adds team size and its change over 6 and 12 months, open roles from job postings, reported funding, and founders' past employers.
Hiring the most counts distinct roles posted in the last 60 days. Growth needs 10+ people today, shrinking 20+ a year ago, so tiny teams do not top the lists. Rebuilt every week.
The numbers on this page come from three Crustdata API calls. Crustdata tags 5,000+ companies with Y Combinator as an investor; swap the filter for any investor, industry or headcount range and track your own list, with founders' work emails one call away.
# 1. every company with Y Combinator as an investor curl https://api.crustdata.com/company/search \ -H "authorization: Bearer $CRUSTDATA_API_KEY" \ -H "x-api-version: 2025-11-01" \ -d '{ "filters": { "field": "funding.investors", "type": "in", "value": ["Y Combinator"] }, "fields": ["basic_info.name", "headcount.total", "headcount.growth_percent", "funding.total_investment_usd"], "limit": 100 }' # 2. open listings per company, last 60 days (limit 0 = counts only) curl https://api.crustdata.com/job/search \ -H "authorization: Bearer $CRUSTDATA_API_KEY" \ -H "x-api-version: 2025-11-01" \ -d '{ "filters": { "op": "and", "conditions": [ { "field": "company.basic_info.company_id", "type": "in", "value": [...] }, { "field": "metadata.date_added", "type": "=>", "value": "2026-08-24" } ]}, "limit": 0, "aggregations": [{ "type": "group_by", "field": "company.basic_info.company_id", "agg": "count" }] }' # 3. the same company filter as a weekly watch: POST /watch/company/search
11 Y Combinator companies have a founder who worked at Atlassian; 9 are active.
We found no job postings for these companies in the last 60 days. 3 mark themselves as hiring on YC's directory.
By team growth over 6 months (10+ people): Caddy (+86%) and Bolna AI (+59%).
Largest latest rounds in the last 12 months, after their YC batch: Bolna AI ($6.3M).