Backend .Net Developer

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

Benefits offered by this job

Attractive salary

Fully remote option

Professional development

Job summary

TeamQuest, a rapidly growing HR consulting firm in Poland, seeks a Backend .Net Developer to join our team across Poland, including Warszawa and other major cities. You will design and implement integrations with external systems, manage asynchronous data exchange, and work with OpenAPI contracts in a collaborative, client-facing setting.

The role involves Docker, CI/CD, and OpenAPI, with opportunities for professional growth and the possibility of fully remote work.

Qualifications

• 3–4 years of experience in a similar role.
• Strong knowledge of C# and .NET (ASP.NET Core, .NET 8+).
• Experience with SOAP/XML integrations and REST/OpenAI integrations.
• Asynchronous architecture with message queues (RabbitMQ).
• Good database knowledge and domain model mapping.
• Proficient with Docker and CI/CD.
• Git in gitflow model.
• English reading of technical documentation.
• Communicative and able to collaborate with client-side personnel.
• Ability to work independently.

Responsibilities

• Design integrations with external systems (SOAP/XML and REST/JSON).
• Maintain asynchronous data exchange (queues, callbacks, idempotency).
• Generate API clients from OpenAPI contracts and adapt to changes.
• Build and maintain mocks of external systems for testing environments.
• Implement business process logic in a BPMN engine using C#.
• Configure environments (Docker, CI/CD) and assist releases/hotfixes.
• Analyze defects from tests and production; cooperate with analysts/testers.
• Document solutions and share knowledge within the team.

Skills

C# / .NET

Async architecture

Independent worker

Collaborative

Tools

Docker

Git (gitflow)

RabbitMQ

CI/CD

OpenAPI

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