Senior Full Stack Engineer

Ciklum is looking for a Senior Full Stack 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 Full Stack Engineer, become a part of a cross-functional development team engineering experiences of tomorrow.

Responsibilities:

• Back-end and Front-end development to meet customer’s business needs and implement components according to modern software development environment (microservice architecture)
• Taking part in the decision-making process in design application architecture, solution development, architecture, and code review
• Develop and review feature design documents and provide inputs/update to specifications for the solution
• Design and implement a set of various types of tests (unit, integration, functional, etc)
• Proactive position in solution development, process improvements
• Working in an international distributed team in an Agile environment
• Communicate with PMs, engineers, architects, and other colleagues and stakeholders
• Delivering the product roadmap and planning
• To use high coding standards, software best practices, and write highly testable, automatable, and performant code over the whole SDLC

Requirements:

• Experience in software development for more than 5 years
• Excellent knowledge:
• Clean code
• OOP
• OOD
• SOLID
• DDD
• TDD
• BDD
• Database theory (RDBMS, NoSQL), Algorithms, and Data structures
• Architectural, Enterprise, and Design Patterns
• Security patterns, Reverse engineering resistance, OWASP
• Network interactions:
• Protocols
• REST
• RPC
• OAuth
• JWT
• Excellent knowledge and experience in C# and .NET
• Practical experience in JavaScript, TypeScript, and React
• Practical commercial experience with:
• REST API development
• .NET Framework
• .NET Core
• ASP.NET (Core, MVC, Web API)
• Testing frameworks (NUnit, XUnit, MSTest)
• ORM (Entity Framework, Dapper)
• RDBMS (SQL Server, MySQL, PostgreSQL) & NoSQL (MongoDB, ElasticSearch)
• Key-value storages (strong experience with Redis)
• Messaging (RabbitMQ, Azure ServiceBus, Kafka, AWS SQS, Google Pub/Sub)
• Web Servers and Version control systems (GIT)
• CI/CD tools (GitLab Pipeline, Jenkins, Azure DevOps)
• Experience with:
• Troubleshooting, profiling, and debugging applications
• Architecture & design of complex applications and microservices
• Agile software processes and Code Review
• Refactoring process and Building AI tools
• AWS/Cloud experience and Kubernetes

Desirable:

• Deployment patterns & Integration with 3rd party solutions
• Quality tools (SonarQube)
• Monitoring tools (Coralogix/Kibana, Grafana, Dynatrace)

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 premium medical package through Luxmed
• Benefits: Access the MyBenefit cafeteria platform, allowing you to choose perks that best suit your lifestyle and needs

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.

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.