Stacksync

Stacksync provides real-time, bidirectional data synchronization between business systems such as CRMs (Salesforce, HubSpot, SAP) and databases (Postgres, Google BigQuery). Changes made in a connected CRM propagate to the database and vice versa, effectively turning the database into a read-and-write interface to CRM data that can be manipulated with SQL rather than through vendor APIs. Syncs are configured without code: users connect two applications, select the tables to sync, and map fields, a process the company states takes under five minutes.

The platform has since expanded beyond sync into what the company calls AI "Genies" — persistent agents that run cross-system business processes across more than 1,000 native integrations, including systems without APIs, which the agents operate through a browser session. Agents can be invoked from chat, email, Slack, Teams, SMS, WhatsApp or API, are model-agnostic (OpenAI, Anthropic, Google, Mistral, or bring-your-own-key), and support human-in-the-loop approval steps where a reviewer approves, edits or rejects an action before a run resumes. Governance features include feature access policies, role-based access control, tamper-evident audit logs, and SSO, SCIM and MFA. Published workflow examples span order-to-cash automation, real-time inventory sync, returns and refunds, marketplace federation, subscription billing sync and CRM customer-360 records.

Stacksync states it is certified or compliant across SOC 2 Type II, ISO 27001, HIPAA BAA, GDPR, CCPA and the Data Privacy Framework for US, EU, UK and Swiss data transfers, and offers connection options including OAuth 2, SSH tunnelling, SSL certificates, IP whitelisting, VPN gateway and VPC peering, plus alerting via email, Slack, PagerDuty and WhatsApp.

Founding story

Stacksync was founded in 2022 by Ruben Burdin (Founder/CEO), whose background is described as data movement, CRM and ERP, and Alexis Favre (Founder/CTO), focused on data movement. The company participated in Y Combinator's Winter 2024 batch. The founders framed the problem as developers finding CRM APIs difficult to navigate, with edge cases and data inconsistencies that carry business consequences, leaving business teams working in CRMs with outdated or missing data.

Business model

Stacksync sells a subscription software platform for system integration and workflow automation. Simple CRM integrations were listed as starting at $200 per month, with pay-as-you-go upgrades for large data volumes; the company also offered Y Combinator portfolio companies an 80% discount for one year, described as worth 120,000 credits. The website advertises a 14-day free trial with no credit card required, alongside white-glove deployment with implementation engineers assigned to customer projects.

Recurring subscription pricing starting at $200/month for simple CRM integrations, with usage-based (pay-as-you-go) expansion for larger data volumes.

Traction

Y Combinator lists a team size of 34 and Active status. The website cites more than 1,000 native integrations and customer case studies covering migrations from MuleSoft, Celigo, Heroku Connect, Matillion and Fivetran. Stacksync was selected by Sequin as the migration partner for its customer base ahead of Sequin's October 2025 shutdown, with typical migrations described as completing in three to five business days.

Latest developments

Stacksync's platform now centers on AI "Genies" — persistent, human-in-the-loop agents that execute cross-system processes such as converting an emailed purchase order into a NetSuite sales order — built from a prompt, callable from Slack, Teams, email, SMS, WhatsApp, chat or API, and usable with any major LLM provider. The company is hiring senior full-stack, frontend (AI product UX) and backend engineers, plus a forward-deployed sales engineer.