•Built a full-stack workflow-automation engine in Java/Spring Boot with 8 pluggable node executors (HTTP, AI, filter, transform, condition, trigger) behind a secure REST API, plus Spring AI + OpenAI natural-language workflow generation and a Next.js frontend.
•Built Stripe-integrated subscription billing (3 tiers) with webhook-driven state reconciliation and a usage-metering quota layer returning HTTP 402 responses to convert free users to paid.
•Added trigger-type and failure-cause classification (timeout, auth, validation) on workflow runs, laying the groundwork for cause-based failure analytics.
•Migrated core infrastructure to managed cloud services – file storage to Cloudinary, transactional email to Resend – while automating deployment via GitHub Actions CI/CD on Render.