Backend / Integration Engineer (Legacy Systems)

Own and extend our integration layer across legacy systems. For each system you build a reliable connector that feeds data into LogicPlan in real time and keeps running in production. The first connector is a Windows service in C# / .NET that ingests orders from a customer's TMS over EDI., * Build connectors that ingest from legacy systems and map and validate heterogeneous XML and JSON into our normalized order model

• Deliver into our REST API in near real time, idempotent and lossless under network failure
• Handle failure with retries, exponential backoff and a dead letter path, no duplicated or dropped orders
• Make it operable: structured diagnostics, health signals, configuration over hardcoding
• Extend the layer to the next systems as we grow

• Deep C# / .NET (Windows Services, background workers, async, HttpClient)
• Proven legacy integration experience, not just modern REST
• REST integration and data transformation (XML, JSON, schema mapping)
• Strong instincts for failure modes and reliability in distributed integration
• Energized by moving fast with AI agents while keeping a high bar on what ships
• EDI or logistics exposure is a plus, not required

LogicPlan is an early stage company building software for European logistics. We integrate with the systems transport companies already run rather than replacing them, which means a lot of work with older technology: EDI, FTP, SOAP and bespoke connectors.