Backend .Net Developer

TeamQuest is a rapidly growing Polish company engaged in the comprehensive HR consulting services, in particular in the recruitment of IT professionals.

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

Backend .Net Developer

location: Wrocław, Białystok, Kraków, Warszawa, Łódź, Katowice, Poznań, Rzeszów, Lublin, Gdańsk

Tasks

• 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.

We Expect You Have

• Minimum 3-4 years of experience in a similar position
• Experience working with AI tools in development
• Very good knowledge of C# and .NET (ASP.NET 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

Nice To Have

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

We Can Offer You

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

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