Backend .Net Developer

ipracujzdalnie.pl; Łódź; Remote; PLN 120,000 - 180,000; Full time

Benefits offered by this job

Fully remote work

Professional development

Influence project shaping

Attractive salary

Job summary

TeamQuest is a rapidly growing Polish HR consulting company focusing on IT recruitment. We are seeking a Backend .NET Developer to join a team delivering integrations with external systems and robust asynchronous data exchange in a client-driven environment.

You will work across a variety of Polish cities with the possibility of fully remote work, collaborating with client analysts and testers to ensure high-quality solutions.

Qualifications

• 3–4 years of experience in a similar Backend .NET role.
• Strong knowledge of C# and ASP.NET Core (.NET 8+).
• Experience with SOAP/XML and REST/JSON integrations.
• Experience with asynchronous architectures and message queues (RabbitMQ).

Responsibilities

• Designing and implementing integrations with external systems (SOAP/XML and REST/JSON).
• Maintaining asynchronous data exchange (queues, callbacks, idempotency).
• Generating API clients from OpenAPI contracts and handling version changes.
• Building and maintaining mocks of external systems for tests.
• Implementing business logic in a BPMN engine and rule models.
• Configuring environments (Docker, CI/CD) and participating in releases.

Tools

RabbitMQ

OpenAPI

Docker

CI/CD

Git

ASP.NET Core

NServiceBus

REST/JSON

Job description

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

Main 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
• 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

Good To Have

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

We Offer

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