Software Developer .NET

Paessler GmbH; Kraków; On-site; PLN 210,000 - 260,000; Full time

Benefits offered by this job

Flexible working hours

Permanent contract

International team with flat hierarchi

Structured onboarding

Job summary

Paessler GmbH is seeking a Software Developer to design, build, and continuously improve features for enterprise customers in a vibrant, agile team. You’ll own architecture and code quality while exploring AI/ML integrations, massive-scale observability, and modern CI/CD practices across Linux, Windows, and macOS.

In this role you’ll shape the product with strong C#/.NET expertise, distributed systems know-how, and front-end familiarity, collaborating with a product manager and contributing to a

Qualifications

• 6+ years of software engineering on the .NET platform with deep mastery of C#.
• Extensive experience with .NET Core 9+ and high-performance paradigms.
• Experience designing and debugging high-concurrency distributed systems.
• Hands-on in Linux and Windows service deployment (macOS a plus).
• Strong knowledge of SQL, schema design, and enterprise DB integration.
• Frontend proficiency with TypeScript, JavaScript, and HTML.
• Experience with CI/CD workflows including GitLab and Jira.
• Familiarity with AI-driven coding tools to accelerate delivery.

Responsibilities

• Design, build, and maintain resilient backend services and cross-platform apps.
• Architect distributed systems using modern patterns and Clean Code.
• Integrate relational and time-series databases into core product architecture.
• Leverage AI tools within development lifecycle for observability and diagnostics.
• Collaborate across lifecycle with Git-based workflows and Jira.
• Learn network/IoT domain internals to contribute to core engineering.

Skills

.NET

C#

Distributed Systems

Cross-Platform

SQL

TypeScript/JavaScript/HTML

Docker

Kubernetes

GitLab CI/CD

Jira

AI-assisted tooling

Tools

Docker

Kubernetes

GitLab

Jira

Git

Job description

Are you passionate about building software that keeps IT infrastructures running smoothly around the world? Our PRTG Core Team is looking for a Software Developer to help us design, build, and continuously improve the features that our enterprise customers rely on every day. Working within a small, agile team, you'll take ownership of architecture and code quality, collaborate closely with our product manager, and help shape the future of network monitoring while getting the chance to explore exciting areas like AI/ML, messaging systems, and modern CI/CD practices. If you enjoy solving complex problems, writing clean, maintainable .NET code, and want to grow alongside a team that values curiosity and craftsmanship, we'd love to hear from you.

YOUR TASKS

• Design, build, and maintain resilient backend services and cross-platform applications supporting Linux, Windows, and macOS.
• Architect distributed systems following modern software architecture, Clean Code principles, and proven design patterns.
• Integrate traditional relational databases and high-performance time-series databases into the core product architecture.
• Leverage modern AI tools within the development lifecycle and explore AI/ML integrations for system observability and automated diagnostics.
• Collaborate across the full lifecycle using modern Git-based workflows, GitLab CI/CD pipelines, and Jira.
• Learn the inner workings of specialized network and IoT monitoring systems to contribute to core domain engineering.

YOUR PROFILE

Must-Have Qualifications & Core Skills

• Experience Level: 6+ years of software engineering experience on the .NET platform with deep mastery of C#.
• Modern .NET Stack: Extensive experience with .NET Core 9+, utilizing current platform capabilities and high-performance paradigms.
• Distributed Systems: Solid track record designing, building, and debugging complex, high-concurrency distributed systems.
• Cross-Platform Engineering: Hands-on experience developing and deploying services across Linux and Windows (macOS environment experience is a plus).
• Databases & Data Integration: Strong knowledge of SQL, schema design, query optimization, and enterprise database integration.
• Full-Stack / Web Foundations: Proficiency in modern frontend technologies including TypeScript, JavaScript, and HTML.
• Containers & CI/CD: Solid experience with Docker, containerized workflows, Git, and automated CI/CD practices (GitLab, Jira).
• AI-Assisted Engineering: Demonstrated experience or active engagement with AI-driven coding tools (e.g., GitHub Copilot, Cursor, LLM-based tools) to accelerate software delivery.

Nice-to-Have Qualifications

• Orchestration & Cloud: Hands-on experience with Kubernetes (k8s) and public cloud deployment patterns (AWS/Azure/GCP).
• Domain Experience: Background in network infrastructure, network monitoring, or IoT sensor data ingestion systems.
• Specialized Storage: Familiarity with high-throughput Time-Series Databases (e.g., InfluxDB, TimescaleDB, QuestDB).
• System-Level Languages: Production experience with Rust, or a strong willingness to learn and apply Rust where ultra-low latency or explicit memory control is needed.
• AI/ML Integration: Hands-on experience embedding AI/ML frameworks or models into enterprise backend workflows.

Soft Skills & Working Style

• Strong technical leadership, analytical thinking, and a pragmatic problem-solving mindset.
• Commitment to code quality through peer reviews, automated testing, and clean design. Enthusiasm for learning domain-specific protocols and deep network/IoT domain internals.

FACTS FOR YOU

• Many possibilities to further develop your individual skillset
• Innovative and creative work environment with plenty of room for new ideas
• A structured onboarding phase with experienced colleagues
• Flexible working hours and a family-friendly environment
• Permanent employment contract
• A great working atmosphere in an enthusiastic international team with flat hierarchies
• Paessler is a fast-growing midsized company that has been in the market for 20 years. The company is focused on long-term goals and is currently comprised of 400+ employees

For us, diversity is more than just a word — it's a commitment. Our job posts are geared towards all people, regardless of their gender, sexual orientation, background, faith, or physical abilities. We value diversity and strive to create a work environment that prioritizes equal opportunities and inclusion. In line with this objective, please note that candidates with severe disabilities will be given preferential consideration over applicants with equal qualifications. At Paessler, we're determined to break down barriers and provide everyone with the chance to develop their full potential. Please feel free to let us know if you believe there are ways we can improve the wording of our jobs posts or our overall recruitment approach. Let's work together to create a more colorful and inclusive corporate culture!