Backend .Net Developer w Białystok, Polska

Our client develops IT solutions, mainly for prestigious clients in the financial and automotive sectors.

We offer:

• Attractive salary
• Possibility of fully remote work
• Real opportunity for professional development
• Possibility to genuinely influence the shape of projects

Responsibilities:

• Designing and implementing integrations with external systems (SOAP/XML and REST/JSON services), including data model mapping and partner error handling.
• Maintaining and developing an asynchronous data exchange mechanism (message queues, callbacks, statuses, request idempotency).
• Generating and updating API clients based on OpenAPI contracts provided by the client; responding to contract version changes.
• Building and maintaining mocks of external systems for test environments.
• Implementing business process logic in a BPMN engine (handlers in C#, process variables, signals) and decision rule models.
• Configuring environments (installation parameters, Docker, CI/CD pipeline), participating in preparing releases and hotfixes.
• Analyzing defects from business tests and production based on logs, quick fixes, collaborating with client analysts and testers.
• Documenting solutions and transferring knowledge within the team.

Requirements:

• Minimum 3-4 years of experience in a similar position
• Experience working with AI tools in development
• Very good knowledge of C# and .NET (https://jobeax.com/link/GrYTXLZMpxEMJknV Core, .NET 8 or newer)
• Practical experience with SOAP / XML integrations, REST/OpenAI integrations
• Asynchronous architecture - message queues (RabbitMQ or equivalent), request-callback pattern, idempotency, persistence of exchange state
• Good knowledge of databases
• Mapping of domain models
• Docker and CI/CD
• Git in gitflow model
• English language proficiency for reading technical documentation
• Communicative, open to collaboration with client-side personnel
• Ability to work independently

Additional advantages:

• Experience in the financial/banking industry or in projects for these industries