Product engineer · Germany · Unrestricted work permit
I build the whole workflow, from the interface people use to the integrations behind it. Kontor, the commerce ERP I designed and built alone, handles about 5,000 orders a month across a seller’s 4 marketplace stores and 2 carriers. Before that, I shipped enterprise reporting features at SAP LeanIX.
Designed and built a commerce ERP end to end, now processing ~5,000 orders a month across 4 marketplace stores and 2 carrier integrations: order intake, catalog, packing, shipping, returns, and accounting handoffs.
Turned owner, operations, packer, content, and tax-adviser workflows into role-specific screens and actions.
Built Shopify and carrier integrations with queued work, retries, idempotent processing, and order-level traces for investigating failures.
Test international rail and bus booking products across availability, reservations, booking, cancellation, and partner integrations.
Write and run test cases, investigate defects, run regression tests, and validate API requests and responses with Postman and cURL; raise edge cases and requirement gaps in release discussions.
REST APIs · Postman · cURL · Regression testing
Software Engineer, part-time
SAP LeanIX · Bonn
Built customer-facing features across SAP LeanIX reporting and Pathfinder, turning enterprise-architecture requirements into usable workflows.
Designed fact-sheet count aggregation for Landscape and Matrix reports, deduplicating items across nested clusters and surfacing counts in settings, legends, axis labels, and cluster views.
Moved report data fetching onto GraphQL and retired legacy paths, cutting redundant requests and conditional code and enabling consistent drilldowns and side panels.
Built report-control tools that let AI chat agents read the current report state and apply real filters and configuration changes.
Built full-stack tooling for autonomous-driving data workflows: Python services, JavaScript features, API endpoints, filtering, and map-server integration.
Implemented geospatial retrieval with R-tree spatial indexing, tripling processing speed and reducing manual data annotation by 75%.
Containerized services with Docker and set up Grafana dashboards with role-based access for 10+ team members, cutting data-analysis time by 30%.
Python · JavaScript · Docker · Grafana
IT Assistant, part-time
Institute of Labor Economics · Bonn
Built a web application end to end for concurrent conversion jobs used by hundreds of people, 800% faster than the previous solution.
Integrated external APIs for metadata retrieval and content manipulation; built reusable UI components for guided workflows.
Try the live demo with role accounts