Senior .NET Engineer, Enterprise Systems & SaaS Integration

Harvey Nash Poland; Warszawa; Hybrid; PLN 180,000 - 320,000; Full time

Job summary

Harvey Nash Poland is seeking a senior software engineer to build applications and integrate SaaS enterprise software. You will participate in designing core enterprise systems and modernising features, collaborating with multiple business units and DevOps teams.

The role demands full-stack capability, strong C#/.NET, SQL and REST expertise, plus experience with API integration and cloud-based development across international projects.

Qualifications

• 5+ years of experience in software engineering (development & design) – including enterprise applications.
• Expertise in C#/.Net, SQL and REST.
• Full-stack experience (strong back-end and at least basic front-end dev skills).
• In-depth knowledge of API integration.
• Hands-on experience in Cloud-based enterprise software development and integration.
• Experience with Cloud-base software, database development, automated testing.
• Experience in software optimisation.
• Experience with/at international companies / projects.
• Nice to have: experience with SaaS enterprise software integrations, TDD, AI/LLM tools & integration, CI/CD, app security.

Responsibilities

• Build applications and integration with SaaS enterprise software.
• Take part in design of core enterprise systems.
• Improve, modernise and develop new features.
• Partner with various business functions and stakeholders.
• Take part in refactoring / modernisation initiatives.
• Work with DevOps teams.

Skills

C#/.NET

SQL

REST

Full-stack

API integration

Cloud development

Automated testing

CI/CD

TDD

AI/LLM tools

DevOps collaboration

International projects

Performance optimisation

Front-end basics

Tools

N/A

Job description

Harvey Nash Poland is seeking a senior software engineer to build applications and integrate SaaS enterprise software. You will participate in designing core enterprise systems and modernising features, collaborating with multiple business units and DevOps teams.

The role demands full-stack capability, strong C#/.NET, SQL and REST expertise, plus experience with API integration and cloud-based development across international projects.