Senior .NET Engineer for AI-Powered SaaS, Kraków Hub

BlackLine; Kraków; On-site; PLN 180,000 - 240,000; Full time

Job summary

BlackLine is hiring for an early shaper of our Krakow Engineering Hub. You will build and ship high-impact features for a market-leading AI-powered Invoice-to-Cash platform, using Cursor and Claude to accelerate development.

Join a fast-moving team that values quality, performance, and enterprise-scale security. You will mentor teammates, influence the technical roadmap, and help define the engineering culture in Krakow.

Qualifications

• Strong experience building production-grade SaaS apps.
• Proficiency in C# and software architecture.
• Experience with AI-assisted development tools (Cursor, Claude).
• Familiarity with CI/CD, automated testing, and infrastructure-as-code.
• Knowledge of cloud-native architectures.
• Experience in regulated industries such as finance.

Responsibilities

• Build and ship high-impact features from concept to production.
• Embrace AI-accelerated development using Cursor and Claude.
• Drive technical design for scalable, maintainable SaaS core.
• Collaborate with product, design, and engineers on roadmaps.
• Engineer for enterprise scale focusing on performance and security.
• Mentor teammates and promote best practices via reviews.

Skills

C# expertise

SaaS architecture

CI/CD & automated testing

Observability & tracing

Regulated industry experience

Tools

Cursor

Claude

AWS

Azure

GCP

Job description

BlackLine is hiring for an early shaper of our Krakow Engineering Hub. You will build and ship high-impact features for a market-leading AI-powered Invoice-to-Cash platform, using Cursor and Claude to accelerate development.

Join a fast-moving team that values quality, performance, and enterprise-scale security. You will mentor teammates, influence the technical roadmap, and help define the engineering culture in Krakow.