Senior Software Engineer (.NET)

Software Mind; Kraków; Hybrid; PLN 180,000 - 280,000; Full time

Benefits offered by this job

Remote cooperation

International projects

Travel for projects

Non-corporate atmosphere

Language classes

Knowledge sharing initiatives

Private healthcare

Life insurance

Multisport card

Job summary

Software Mind in Kraków is seeking a senior .NET developer to design and build scalable systems from scratch within an agile, international team. You’ll replace legacy stacks with modern architectures, drive technical discussions, and mentor other engineers while delivering value for global clients.

The role offers flexible remote cooperation, international projects, and opportunities to travel. Strong knowledge of C#/.NET Core, AWS tools, and testing is essential.

Qualifications

• 5+ years of commercial C#/.NET Core experience
• Experience with AWS DevOps tools and CI/CD
• Strong understanding of design principles (SOLID, DDD) and clean code practices
• Experience creating tests (unit, integration, component/contract)
• Practical experience with databases (SQL, MongoDB, NHibernate, EF, Azure Storage)
• Real experience with AI tools

Responsibilities

• Design and build new features from the ground up
• Create PoCs, technical spikes, and validate ideas
• Replace old systems with new architecture
• Perform code reviews and share best practices
• Shape product architecture and technical direction
• Collaborate with senior/principal developers, testers, BAs, Product Owners, and Scrum Masters
• Provide knowledge, experience, and technical leadership to the team

Skills

C#/.NET

AWS DevOps

CI/CD

Software design

Testing

Databases

AI tools

Greenfield

Event-driven

Cloud platforms

Mentoring

Team collaboration

Tools

NHibernate

Entity Framework

Azure Storage

MongoDB

Job description

Software Mind develops solutions that make an impact for companies around the globe. Tech giants & unicorns, transformative projects, emerging technologies and limitless opportunities - these are a few words that describe an average day for us. Building cross-functional engineering teams that take ownership and crave more means we’re always on the lookout for talented people who bring passion and creativity to every project. Our culture embraces openness, acts with respect, shows grit & guts and combines employment with enjoyment.

Job Description

Project - the aim you’ll have

You will join an agile, international team of experienced developers and testers (from Poland and the UK) working on a strategic transformation of the IT ecosystem for a leading travel industry company.

The main goal? Designing and building modern, scalable solutions from scratch - replacing outdated systems with new platforms built using best engineering practices.

As part of the team, you’ll have a real opportunity to:

• co-create new solutions and architecture
• develop Proof of Concepts (PoCs) and test ideas
• drive technical discussions and decisions
• collaborate with other senior and principal engineers
• and leave your mark on a platform that will serve millions of users

The work is organized in 4-5 agile teams, each focused on a specific product area - allowing you to take ownership while collaborating closely across teams. This is not about maintaining legacy systems - this is about building something new.

Role - how you’ll contribute

• Designing and building new features and solutions from the ground up
• Creating Proof of Concepts (PoCs), technical spikes, and validating ideas
• Replacing old systems with new architecture - not maintaining legacy code
• Performing code reviews and sharing best practices
• Participating in shaping product architecture and technical direction
• Collaborating with other senior/principal developers, testers, BAs, Product Owners, and Scrum Masters
• Supporting the team with your knowledge, experience, and technical leadership

  Qualifications

  Expectations - the experience you need

  • At least 5 years of commercial experience in C# and .NET Core
  • Experience with AWS DevOps tools and CI/CD processes
  • Solid understanding of software design principles, patterns (e.g., SOLID, DDD), and clean code practices
  • Experience creating tests (unit, integration, ideally also component or contract tests)
  • Practical experience with databases (SQL, MongoDB, NHibernate, Entity Framework, Azure Storage)
  • Real experience with AI tools

  Additional skills - the edge you have

  • Experience designing new systems or working on greenfield projects
  • Familiarity with event-driven architecture and distributed systems
  • Knowledge of cloud solutions, especially AWS and Azure
  • Willingness to share knowledge, mentor other developers, and actively participate in technical discussions
  • Someone who isn't afraid to admit they don't know something but can work with the team to find a solution

  Additional Information

  What we offer:

  • Flexible and remote cooperation options
  • International projects with leading global clients
  • Travels related to international projects
  • Non-corporate atmosphere
  • Access* to language classes
  • Access* to knowledge-sharing initiatives
  • Access* to private healthcare and life insurance
  • Access* to multisport card

  *The availability and terms of individual benefits may vary depending on the chosen form of cooperation.

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