.NET Developer with Blazor (f/m/x)

Sii Polska; Katowice; On-site; PLN 130,000 - 190,000; Full time

Benefits offered by this job

Private healthcare

Profit sharing

Career development & training

Job summary

Sii Polska is seeking an experienced .NET Developer to design, develop, and maintain enterprise desktop applications using C# and .NET. You will build desktop apps with WPF, integrate with industrial systems, and contribute to architecture discussions to deliver high-quality software.

The ideal candidate has 3+ years in C#/.NET, hands-on WPF/WCF experience, and familiarity with Blazor. Polish fluency is required; English is a plus.

Qualifications

• 3+ years of experience with C# and .NET development.
• Knowledge of WPF and WCF technologies.
• Experience with Blazor is strongly preferred.
• Ability to analyze business and technical requirements and translate them into code.
• Strong problem-solving and debugging skills.
• Fluent Polish language abilities.

Responsibilities

• Design, develop, and maintain enterprise applications using C# and .NET.
• Create desktop applications and services using WPF and related Microsoft technologies.
• Integrate applications with databases, industrial systems, and external services.
• Contribute to software architecture discussions and technical design.
• Transform requirements into high-quality, efficient code.
• Troubleshoot and resolve issues in production and testing environments.

Skills

C#/.NET

WPF

WCF

Blazor

Requirements analysis

Problem solving

Polish language

Job description

We are looking for an experienced .NET Developer to work on an internal desktop project. You will be responsible for designing, developing, and maintaining enterprise applications using C# and .NET. If you are passionate about creating software that supports production processes, this offer may be ideal for you.

• Designing, developing, and maintaining enterprise applications using C# and .NET
• Implementing new functionalities and improving existing software solutions that support production processes
• Creating desktop applications and services using WPF and related Microsoft technologies
• Integrating applications with industrial systems, databases, and external services
• Participating in discussions regarding software architecture and technical design
• Analyzing business and technical requirements and transforming them into high-quality code
• Troubleshooting, debugging, and resolving issues in production and testing environments

Requirements

• Minimum 3 years of experience in programming with C# and .NET
• Knowledge of WPF and WCF technologies
• Experience working with Blazor
• Ability to analyze business and technical requirements and implement them in code
• Problem-solving skills and debugging capabilities
• Fluent knowledge of Polish

Nice to have

• Knowledge of English at a communicative level

Job no. JOB-ELDX8

Nr oferty JOB-ELDX8

Sii ensures that all hiring decisions are made solely on the basis of qualifications and competence. We are committed to equal and fair treatment of all, regardless of legally protected characteristics. At Sii, we promote a diverse and inclusive work environment, in full compliance with applicable anti-discrimination laws.

Since 2 01 5 , we have been recognized with the Great Place to Work title every year , a prestigious award ba sed on employee s feedback . According t o the study , ov e r 92 % of people working at Sii consider it a fantastic place to work.

Solid financial situation

We began as a one-person start-up in 2006 and grew into a 7 500 w orker s company in 2025, generating revenue of PLN 2.2BN , having no debts, and being recognized as the leading IT services provider in Poland by the Computerworld TOP200 report. Check out more facts that prove our market strength .

We are a key partner for many prestigious global companies from different sectors i.a : BNP Paribas , KUKA, ING or Bombardier with whom we have contracts that guarantee continuity of employment for our workers.

Centre of internal trainings

Our own training cent er organi zed around 300 technical and soft skills training courses last year. More than 3 300 people took part and rating them at 4.7/5. Training s are conducted by practitioners, both experts from Sii and outside the company. Our employees can also request for individual external courses .

Many experts you can learn from

At Sii we have a lot of knowl e dge sharing initiatives – our workers can join technology C ommunit ies , participate in a mentoring program or benefit from in-house training s , blog and e-learning platforms.

Open and accessible management team

No matter our title, we address each other by first names. Transparency and dialogue are important for us, that’s why we periodically organize local CEO meetups, online CEO live sessions and departmental Inspiration Days. During them everyone has the opportunity to meet with people managing the company, ask questions, report problems and discuss troubling issues.

Profit sharing

Sii shares its profit with employees to thank everyone for a great year and results. We know that without the huge commitment of Power People, the company’s success would not be possible. From 2022, over PLN 76 M has already been allocated for this aim.

Passion Sponsorship program

We allocate PLN 1M annually for the development of passions and hobbies through our Passion Sponsorship & Volunteers programs. Thanks to this funding, 25% of our Power People pursue their dreams each year – such as climbing Mont Blanc, running races in the most remote corners of the world, or sending a balloon into the stratosphere.

Every year we organi z e more than 700 events, allocating for this aim bugdet exceeding PLN 15 M . We take care not only for integration of our workers, but also we provide entertainment for their families within regular St. Nicholas Days, Family Picnics, Carnival Balls .

We have A+ class offices in the centers of 14 Polish largest cities, allowing easy access for both our employees and clients, from anywhere in the country and the world.

Project rooms, meeting rooms, modern equipment, relax and childcare area or even a slide – these are just some of the facilities we offer.

Work smarter , not harde r – guided b y this idea we have developed an app for our employees that simplifies all administrative activities . It take just a few clicks on the phone to submit a holiday request, report on working time or track reminders for upcoming tasks.

The app is also available for candidate s. You can download it for both iOS and Android .

Medical care

We offer private healthcare packages to our workers, with access to more than 5 000 specialists. The option also includes dental services and the possibility to add family members .

We will contact you as soon as we review your CV