Senior .NET Engineer

Ciklum is looking for a Senior .NET Engineer to join our team full-time in Poland.

We are a custom product engineering company that supports both multinational organizations and scaling startups to solve their most complex business challenges. With a global team of over 4,000 highly skilled developers, consultants, analysts and product owners, we engineer technology that redefines industries and shapes the way people live.

About the role:

As a Senior .NET Engineer, become a part of a cross-functional development team engineering experiences of tomorrow. This role blends strong expertise in C#/.NET, databases, and distributed architectures with a focus on clean code, testing practices, and cloud-native solutions. As a Senior .NET Engineer, you'll shape technical direction, contribute to architectural decisions, and deliver reliable, high-performance software. You'll also collaborate across teams, drive process improvements, leverage AI-assisted coding tools, and mentor junior developers.

Responsibilities:

• Back-end development of new functionality
• Participating in code and architectural reviews, documenting architecture
• Communicating with stakeholders: PMs, developers, architects, QA engineers and other colleagues
• Proactive position in solution development, processes improvements
• Delivering the product roadmap and planning for the future
• Handle complex problems that might arise during solution development and provide field support with creative and rapid solutions
• Ensure that the highest coding standards are met and write highly testable, automatable and performant code over the whole SDLC
• Accelerated and Productive Development using AI Tools

Requirements:

• More than 4 years of experience in commercial software development
• Excellent knowledge of computer science and computing theory:
  • OOP, DDD, SOLID, TDD, BDD
  • Database theory (RDBMS, NoSQL)
  • Algorithms and data structures
• Design, architectural and enterprise pattern
• Understanding of network protocols and conventions (e.g. HTTP, REST), authentication and authorization flows and practices
• Experience with NoSQL (e.g. Mongodb, DynamoDB)
• Knowledge of key-value storages (e.g. Redis, Memcached)
• Basic knowledge of containerization and orchestration (Docker, Kubernetes)
• Excellent knowledge and experience with C# and .NET
• Should possess exposure and hands on experience with AI tools preferably github copilot, and additionally exposure to Vibe coding
• Commercial experience with:
  • .NET Framework, .NET Core, ASP.NET (Core, MVC, WebAPI)
  • ORM (e.g. Entity Framework, Dapper)
  • RDBMS (especially SQL Server)
  • Messaging systems (e.g. RabbitMQ, ServiceBus)
  • Cloud providers (e.g. Azure)
  • Testing frameworks (e.g. NUnit, XUnit, MSTest)
  • Web Servers
  • Version control systems (e.g. GIT) 
• Upper-intermediate English or above
• Ability to relate positively to and engage with a wide range of people
• Strong self-motivation, reliable and flexible team-player. High attention to details
• Always seeking to improve processes and suggest alternative better solutions
• Be ready to embrace change, be flexible
• Ability and willingness to mentor more junior team members

Desirable:

• Experience with Search Engines (e.g. ElasticSearch, Azure Search)
• Experience with REST API development for mobile application
• Experience with integration with 3rd party solutions

What`s in it for you?

• Strong community: Work alongside top professionals in a friendly, open-door environment
• Growth focus: Take on large-scale projects with a global impact and expand your expertise
• Tailored learning: Boost your skills with internal events (meetups, conferences, workshops), Udemy access, language courses, and company-paid certifications
• Endless opportunities: Explore diverse domains through internal mobility, finding the best fit to gain hands-on experience with cutting-edge technologies
• Flexibility: Enjoy flexibility – full remote working possibilities
• Care: We've got you covered with company-paid medical insurance, mental health support, and financial & legal consultations

About us:

At Ciklum, we are always exploring innovations, empowering each other to achieve more, and engineering solutions that matter. With us, you'll work with cutting-edge technologies, contribute to impactful projects, and be part of a One Team culture that values collaboration and progress.
With delivery centers in Wrocław and Gdańsk, our 300+ professionals in Poland drive forward-thinking solutions for global clients. Join a community where collaboration sparks innovation—and your impact reaches millions.
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Explore, empower, engineer with Ciklum

Interested already? We would love to get to know you Submit your application. We can't wait to see you at Ciklum.