Understory.io (Holdbar.com A/S)
- Type
- Company
- Dates
- Jul 2023 - Feb 2025
Understory (now Holdbar.com A/S) is a software-as-a-service company delivering licensed software for the tours and activities industry, and it's where TrueStory's own founders went next. They brought me with them: I joined as one of the first few members on the Holdbar team, July 2023 to February 2025, as a Senior Product Developer. Mostly remote from Colombo, with two months on-site at their Aarhus headquarters to help with onboarding and to work with clients face to face.
The main system was a multi-tenant booking platform running on AWS, event-driven and built on serverless primitives, where correctness in the booking flow mattered more than almost anything else I've worked on. Alongside that I built an LLM-powered lead-sourcing engine on Amazon Bedrock that analyzed over 1.3 million Nordic websites, and data-warehousing and analytics workflows on AWS Glue, Athena, and Redshift.
The moment I'd point to first is the internal AI hackathon. I built a WebSocket-based onboarding engine, won the hackathon outright, and then watched Understory take it straight into production rather than let it die as a demo. It's still live.
Built with
- AWS Glue / Athena
- Node.js
- TypeScript
- AWS DynamoDB
- AWS SDK for JavaScript (v3)
- AWS serverless (Lambda, SQS, EventBridge, API GW)
- FastAPI
- JWT authentication
- OpenAI API
- aiohttp
- Amazon Bedrock
- Amazon ECR
- AWS IAM
- Amazon Redshift
- Amazon S3
- BeautifulSoup / requests
- Boto3 (AWS SDK for Python)
- C4 Model
- C#
- Docker
- Flask
- Google Ads integration
- Google Tag Manager / GA4
- Mangum (ASGI-on-Lambda adapter)
- Meta Pixel
- NestJS
- Next.js 16
- Natural Language Processing (NLP)
- Notion
- pandas
- PlantUML
- Pydantic
- PySpark
- Python
- React 19
- Slack
- Stripe (webhooks)
- Terraform
- ts-node
- VAT / payment-pricing correctness
- WebSockets
- XUnit / Moq
- AWS CloudWatch
- Event-Driven Architecture
- GitHub
- JavaScript
- Sentry
Links
Related
- Multi-tenant booking platform backend
- Data warehousing and analytics
- LLM-powered lead-sourcing engine: Amazon Bedrock
- Operational tooling and monitoring
- Infrastructure-as-code platform enablement
- Event cancellation, payment, and analytics enhancements
- WebSocket-based AI onboarding engine
- Hospitality & Experience Platforms