Automation & systems integration engineer
- €60-€92/hr
- Part time
- 11 years
- REST API integration
- Cron & scheduling
- ETL / data pipelines
- OAuth & identity flows
- HubSpot
- n8n
- Zapier
Portfolio site
example.test/jonas-duval-9 (opens in a new tab)
Hosted elsewhere. We link to it but never read it, so it does not feed matching.
Projects 3
Two-way CRM ↔ billing sync
Tech lead
Bidirectional contact and invoice sync with conflict rules. Cut a 6-hour weekly manual reconciliation to zero.
- rest-api-integration
- zapier
- n8n
- oauth
Order routing automation
Contract developer
Rules engine over incoming orders with a human-approval step for exceptions.
- n8n
- cron
- hubspot
- zapier
Two-way CRM ↔ billing sync (second engagement)
Sole developer
Bidirectional contact and invoice sync with conflict rules. Cut a 6-hour weekly manual reconciliation to zero.
- rest-api-integration
- n8n
- cron
- etl
About
CRM-to-billing plumbing. I wire HubSpot, Zoho and Stripe together with n8n or custom workers — OAuth apps, scheduled reconciliation, dead-letter handling, and alerting that names the failing record.