Senior .NET (C#) Engineer

Salary range: B2B - 34-38 E/h + VAT 💰

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  an experienced .NET Engineer, become a part of our telephony team and contribute to the design, development, and maintenance of enterprise-level applications in this area (VoiP, phone masking, caller branding, IVR management and so on). The successful candidate will be responsible for building robust, scalable software solutions using the .NET ecosystem, whilst collaborating with cross-functional teams to deliver high-quality applications that meet business requirements.

Responsibilities:

• 3+ years of professional experience in C# .NET development

• Strong proficiency in C# and object-oriented programming principles

• Experience with .NET Framework and .NET Core/.NET 5+ development

• Solid understanding of ASP.NET (Web API, MVC) for web application development

• Proficiency with Entity Framework or similar ORM frameworks

• Experience with SQL Server and database design principles

• Knowledge of RESTful API design and implementation

• Familiarity with version control systems (Git, Azure DevOps, TFS)

• Understanding of software design patterns and SOLID principles

• Experience with unit testing frameworks (NUnit, xUnit, MSTest)

• Experience with Agile/Scrum methodologies

• Knowledge of code review processes and collaborative development

• Understanding of software architecture patterns (MVC, MVVM, Clean Architecture)

• Familiarity with debugging and performance profiling tools

• Experience with application security best practices

• Knowledge of CI/CD concepts and deployment processes

Requirements:

Advanced .NET Ecosystem:

• Experience with .NET 6/7/8 and latest framework features

• Knowledge of Blazor for web UI development

• Familiarity with gRPC and high-performance communication protocols

• Experience with SignalR for real-time web functionality

• Knowledge of microservices architecture and containerisation (Docker, Kubernetes)

• Experience with Azure Service Fabric or similar platforms 

Cloud and DevOps:

• Experience with Microsoft Azure services (App Service, Functions, Service Bus)

• Knowledge of AWS or Google Cloud Platform services

• Familiarity with Infrastructure as Code (ARM templates, Terraform)

• Experience with Azure DevOps or similar CI/CD platforms

• Knowledge of monitoring and logging solutions (Application Insights, ELK Stack)

Database and Data Management:

• Experience with NoSQL databases (MongoDB, CosmosDB, Redis)

• Knowledge of data warehousing and ETL processes

• Familiarity with message queues and event-driven architectures

• Experience with database performance optimisation and query tuning

• Understanding of data migration strategies and tools

• Experience with enterprise integration patterns and middleware

• Knowledge of identity management systems (OAuth, SAML)

• Additional Programming Languages

• Kotlin experience for server-side applications

•  Experience with legacy system integration and modernisation

• Understanding of compliance and security frameworks (GDPR, ISO 27001) 

• Familiarity with enterprise service bus architectures

Desirable:

• Strong analytical and problem-solving abilities

• Excellent communication and teamwork skills

• Ability to work effectively in collaborative environments

• Self-directed learner with ability to adapt to new technologies

• Strong attention to detail and commitment to code quality

• Time management skills with ability to handle multiple priorities

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.