Senior .NET Software Engineer
ARHS Group22 hours ago
Warsaw, PolandSenior
Responsibilities
- Design and develop enterprise-level software solutions across data, business logic, and UI layers.
- Lead development teams and provide technical leadership, estimates, standards, prototypes, and technical solutions.
- Translate requirements into application designs and document technical solutions using UML.
- Optimize software for performance, security, and quality and collect and interpret software metrics.
- Manage configuration, releases, deployment, change management, testing, and quality assurance.
- Develop testing tools, contribute to requirements analysis, and support solution validation.
- Deploy and operate applications on Windows/IIS and containerized or virtualized platforms.
- Provide second- and third-line support, including code review, technical-debt management, production support, incident analysis, and UAT support.
- Work alongside a third-party development contractor during its third-level-support period.
Requirements
- Bachelor's degree and at least 6 years of relevant professional IT experience.
- At least 3 years of project experience relevant to the profile or a similar position.
- Minimum English proficiency at CEFR Level B2.
- At least one advanced-level software development technology certification or internationally recognized equivalent certification accepted by the Contracting Authority.
- Experience completing at least one full solution lifecycle.
- Expertise developing enterprise web applications with .NET Core/.NET 8, C#, Entity Framework, and SQL Server.
- Experience developing React/TypeScript single-page applications and building and deploying them through Azure DevOps Pipelines.
- Hands-on experience with Windows/IIS, Nutanix or OpenShift, Hangfire or similar background-job frameworks, ASP.NET Core Data Protection, and certificate management.
- Experience remediating security-scan and penetration-test findings.
- Experience integrating applications with SAML 2.0 and Entra ID, and with PDF/image-processing libraries and document-management interfaces.
- Experience taking over externally delivered codebases, including code review, technical-debt management, and third-line support.
- Experience supporting production systems in large organizations, including Change Advisory Board release management, UAT support, and incident analysis.
- Knowledge of UML and experience designing applications in UML, with the ability to lead technical teams and document technical solutions effectively.
Tech Stack
Categories
About ARHS Group
ARHS Group is a Luxembourg‑headquartered IT services firm that designs and delivers custom software, data, cloud, and infrastructure solutions for public- and private‑sector clients across Europe. Founded in 2003 and privately held, it builds and operates enterprise systems, including integration architectures, APIs, and secure digital platforms, for government bodies, telecom operators, and financial institutions. The company works on complex, multi-country programs spanning on‑premises, hybrid, and cloud environments.