Senior Full-Stack Engineer - .NET/React + AI Tooling

Seargin; Gdynia; On-site; PLN 180,000 - 300,000; Full time

Job summary

Seargin is a dynamic multinational tech company operating in 50 countries, delivering software solutions across life sciences, cancer drug development, and industrial clients. We seek developers proficient in the Microsoft stack and modern architectures to design, build, and evolve scalable software systems.

You will collaborate across teams to deliver robust products, apply AI-assisted tools, and participate in agile processes to continuously improve software quality and performance.

Qualifications

• 4+ years of professional experience designing, developing, and delivering software with the Microsoft stack (C#, .NET, MS SQL).
• Experience with microservice architecture, APIs, and modern system design principles.
• Experience across the full application lifecycle, from design to deployment and maintenance.
• Practical experience with AI-assisted development tools (e.g., Copilot) and applying them responsibly.

Skills

Microservices

APIs

System design

English communication

Agile methodologies

Copilot / AI-assisted development

Education

Bachelors or Masters in CS/Software Engineering

Tools

.NET (C#)

MS SQL

React

TypeScript

WebComponents

WebAPI GraphQL

Azure ServiceBus

Job description

Seargin is a dynamic multinational tech company operating in 50 countries, delivering software solutions across life sciences, cancer drug development, and industrial clients. We seek developers proficient in the Microsoft stack and modern architectures to design, build, and evolve scalable software systems.

You will collaborate across teams to deliver robust products, apply AI-assisted tools, and participate in agile processes to continuously improve software quality and performance.