Daniel Hillmann

• Supporting 40,000+ Monthly Active Users (MAU) by maintaining high-availability systems that generate thousands of financial documents and process hundreds of thousands of ecosystem events monthly.
• Accelerated collection searches by 500x by refactoring queries to leverage MongoDB Atlas Search.
• Led the domain-level implementation of company-wide strategic initiatives, including the transition to private Kafka clusters and the global user-merchant account split.
• Reduced database costs by 36% and query load by 50% through targeted query optimization and refactoring.
• Architected and maintained core Fintech services including reconciliation, open banking payments, and a refactored AIS integration for organization-wide use.
• Led the migration from legacy Heroku deployments to in-house Docker and Kubernetes infrastructure.
• Drove architecture decisions through RFCs to simplify systems and eliminate legacy code.
• Configured static code analysis tools and closed countless of security vulnerabilities as a Security Champion.
• Created standardized repository templates and monorepo tools to automate CI/CD pipelines, security policies, and dependency management.

• Built the core bridge service connecting SumUp and Debitoor platforms, handling millions of monthly transactions.
• Successfully migrated the entire merchant base from a legacy synchronization service to a new integration API.
• Built government API integrations including SDI e-invoicing (Italy), HMRC VAT reporting (UK)
• Modernized the development pipeline by migrating the CI/CD flow from TeamCity to CircleCI.
• Built a Yapily Open Banking integration allowing merchants to connect and sync external bank accounts.

• Led the migration to a new static CMS system of the public site.
• Mentored and supported the marketing team during the transition.
• Built numerous internal tools and vscode extensions to automate workflows and support content writers

Helps VS Code users seamlessly convert between YAML and JSON formats.

• 100,000+ installations
• Highly positive community reviews

Cross-platform CLI tool to kill processes on a port.

• 80,000+ weekly downloads