SEIDOR
.NET Software Developer - Warsaw - Hybrid
Skills
14 days ago
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Important information
Location:
Warsaw, Poland
Work mode:
Onsite
Published on:
12 October 2026
What they need
ABOUT THE JOB
We are a large company with a start-up spirit. We organize ourselves into expert knowledge Units that collaborate with each other.
That's why we are looking for curious individuals who are motivated by challenges and eager to grow personally and professionally, to join our team and make a positive impact on the world through technology.
ARE YOU UP FOR THE CHALLENGE?
We want you to be a part of our team, from Warsaw, as a .NET Software Developer.
WHAT WILL YOU DO IN YOUR DAY-TO-DAY?
- Designs and develops the system
- Lead development teams
- Translates requirements into design
- Optimizes software from performance, security and quality points of view
- Produces technical documentation
- Estimates effort and time for development
- Sets software development standards
- Propose technical solutions for business needs and technical problems
- Collects and interprets software metrics
- Manages configuration and releases
- Contributes to requirements analysis, testing, quality assurance, change management, deployment
- Tests solutions and develops testing tools
- Documents developments
- Prototypes solutions
- Acts as 2nd and 3rd line support
Will you join us in humanizing technology?
WHAT DO WE EXPECT FROM YOU?
The consultant must demonstrate experience in:
- 6+ years of experience
Certification: At least one advanced software-development certification or an internationally recognized equivalent accepted by the Contracting Authority.
Core expertise:
Proven development and support of enterprise web applications on .NET (Core / 8) with C#, Entity Framework and SQL Server, and of React/TypeScript single-page applications, including build and deployment through Azure DevOps Pipelines
Hands-on experience with deployment and operation of applications on Windows/IIS and container or virtualised platforms (Nutanix / OpenShift), background-job frameworks (e.g. Hangfire), ASP.NET Core Data Protection and certificate management, and with security-scan (Checkmarx) and penetration-test remediation
Experience integrating applications with SAML 2.0 / Entra ID, PDF and image-processing libraries and documentmanagement interfaces, and with taking over a code base delivered by an external contractor (code review, technical-debt
management, third-line support)
Experience supporting production systems in a large organization context (release management through a Change Advisory Board, UAT support, incident analysis) and readiness to work alongside a 3rd party development contractor during
its third-level-support period
Relevant project experience:
- Has gone at least 1 time through the complete lifecycle of the solution
- Expert in developing enterprise level software systems in specified technology domain
- Knows UML and can design applications in UML
- Proficient in designing and developing: data layer, business logic layer and UI layer
- Worked in Scrum developments
- Is capable for leading technical teams
- Holds ability to document effectively technical solutions
- Presents problem solving skills
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