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Senior Fullstack Engineer (.NET + React)

Spyrosoft Show all offers

Olsztyn

Wrocław

Poznań

Łódź

21 days ago

In short

Spyrosoft seeks Senior Full-Stack Engineer (.

NET + React) in Olsztyn. Responsibilities include developing full-stack apps with .

NET & React, building backend services/APIs, optimizing SQL, and collaborating on technical decisions. Requires 5+ years experience, C#, .

NET, React, SQL, cloud experience, and English B1/B2.

Keywords

.NET Framework .NET Core JavaScript React SQL SQL Server Azure SQL Microsoft Azure Git Scrum/Agile

AI-written summary based on the listing content.

Tech Stack:.

NET Framework, .

NET Core

Java

Script, HTML, CSS, and ReactSQL and relational databases (SQL Server, Azure SQL)

Responsibilities:

Develop and maintain full-stack applications using .

NET and ReactBuild and enhance backend services, APIs, and web interfaces

Design and optimize SQL queries and database solutions
Take ownership of delivered solutions, from technical design through implementation and testing
Contribute to technical decisions and continuous improvement of the product
Write clean, maintainable, well-tested code
Collaborate with Product Owners, designers, and other engineers to translate business needs into technical solutions
Participate in code reviews and knowledge sharing within the team
Requirements:

Minimum 5 years of commercial experience as a Software Engineer

Strong knowledge of C# and the .

NET platform (.

NET Framework, .

NET Core)

Strong experience with JavaScript, HTML, CSS, and ReactGood knowledge of SQL and relational databases (SQL Server, Azure SQL)

Experience with Microsoft Azure or other cloud solutions

Experience working in Scrum/Agile environments
Knowledge of GitGood understanding of software design principles, patterns, and best practices
Experience writing unit, integration, and automated tests
Ability to write clean, maintainable, and well-structured codeStrong analytical and problem-solving skills
Ability to communicate effectively and collaborate with both technical and business stakeholders
English proficiency at a minimum B1/B2 level
Polish proficiency at a minimum B2 level Nice to have
Nice to have:

Experience with desktop applications using Win

Forms and/or WPF
Experience with Azure DevOps and CI/CD processes
Knowledge of Type
Script
Experience with ERP, HR, or payroll systems
Experience with REST APIs, third-party integrations, Entity Framework, SignalR, or microservices
Experience using AI tools in day-to-day development workflows
Project Description:

We are looking for an experienced Senior Full-Stack Software Engineer to join a team developing business applications that support HR processes for a leading provider of ERP and HR solutions in the Polish market. You will work across backend, frontend, and database layers, using .

NET, React, and SQL to develop and evolve the product. Experience with desktop technologies such as Win

Forms or WPF will be an advantage due to parts of the existing solution using these technologies. You will collaborate with Product Owners, designers, and engineers, contribute to technical decisions, and help deliver solutions that address real business needs.