Backend .NET Developer
Offer summary

(Summary generated by AI based on the full job description)

The project delivers IT solutions for clients in the financial and automotive sectors. Required stack: C#, .NET 8+, ASP.NET Core, SOAP/XML and REST/JSON integrations, asynchronous data exchange with RabbitMQ-style message queues, Docker and CI/CD, Git (gitflow). Responsibilities include designing integrations and domain mappings, maintaining async mechanisms (callbacks, idempotency, exchange state), generating/updating API clients from OpenAPI, building external system mocks, implementing business logic in a BPMN engine, configuring environments, participating in releases and hotfixes, and analyzing/fixing defects. Offered: attractive salary, possibility of fully remote, professional growth and influence on the project; benefits: sports cost sharing, private medical care.

Backend .NET Developer

Company: TeamQuest Sp. z o.o.

from: 17 September 2026
to: 17 October 2026
18 000 - 23 000 złnet (+ VAT)/ mth.B2B contract (full-time)
Offer parameters
level:mid • senior
working mode:remote
location:Warszawa, Masovian
Warszawa, Masovian

Requirements

Expected technologies

.NET

Our 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.

Optional

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

Your 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.

About the project

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

This is how we organize our work

This is how we work

at the client's site
Company

What we offer

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

Benefits

  • sharing the costs of sports activities
  • private medical care

Recruitment stages

  • 1.
    Recruitment Interview
Backend .NET Developer
18k–23k zł / mth. (B2B)
I apply to:
TeamQuest Sp. z o.o.
Warszawa, Masovian
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