New offer - be the first one to apply!

June 27, 2026

Backend Software Developer (C#)

Senior • Hybrid

13,000 - 19,000 PLN

Katowice, Poland

Responsibilities

  • Lead backend development and technical delivery of a cloud-native microservices platform.
  • Design, develop, and maintain scalable backend services using C# and .NET.
  • Manage AWS-based infrastructure, including ECS, Lambda, Cognito, and supporting services.
  • Participate in and coordinate vendor transition and knowledge transfer activities.
  • Lead structured codebase handover sessions with the outgoing vendor.
  • Own architecture documentation and knowledge transfer workshops.
  • Ensure full understanding of all backend services, deployment pipelines, and infrastructure components.
  • Develop and maintain Infrastructure as Code using Terraform.
  • Build, optimize, and support ETL processes and data pipelines using Python.
  • Maintain and improve CI/CD processes using GitHub Actions.
  • Collaborate with stakeholders, architects, and development teams to deliver business requirements.
  • Ensure platform reliability, security, performance, and maintainability.

Benefits

  • Motivizer Benefits Platform with a monthly budget of 550 PLN to choose medical care, meal tickets, sports cards, gym memberships, cinema tickets, vouchers, and discounts.
  • Access to a multi-language learning platform.
  • Regular internal and external training opportunities supporting ongoing development.
  • Collaboration within an internal community, networking events, coding challenges, and company parties.

Qualifications

  • Degree in Computer Science, Engineering, or related field.
  • 4+ years of backend software development experience.
  • 2+ years in a Senior Engineer role.
  • Proven hands-on experience working with AWS cloud services in production environments.
  • Experience leading technical teams and driving delivery in complex projects.
  • Strong understanding of microservices, distributed systems, and cloud-native architecture.
  • Experience managing vendor transitions, system onboarding, or large-scale knowledge transfer initiatives is a strong advantage.
  • Ability to work effectively in ambiguous environments and quickly gain ownership of existing systems.
  • Strong communication and stakeholder management skills.
  • Very good knowledge of English and Polish.
  • Openness to visit office once a month.

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Krakow, Poland

19,500 - 24,000 PLN

🏢 Summary: Backend Software Engineer role focused on building, testing, and maintaining C#/.NET-based backend systems and microservices. The position involves designing system architecture, developing REST/GraphQL APIs, and ensuring reliable CI/CD-driven deployments. You will work on scalable systems used across multiple European markets. 🗂️ Requirements: 5+ years of commercial experience in C# development, Strong experience with .NET Core and .NET Framework, Solid knowledge of data structures and algorithms, Strong understanding of software engineering principles and testing, Experience with PostgreSQL, MSSQL, or DynamoDB, Experience designing and implementing REST or GraphQL APIs, Hands-on experience with CI/CD processes, Knowledge of OOP, SOLID principles, and Clean Code, Experience designing software architecture for distributed systems 📃 Skills: C#, .NETCore, .NETFramework, TypeScript, REST, GraphQL, PostgreSQL, MSSQL, DynamoDB, CICD 🏢 Description: About the role You will need to be proficient in C# backend development with a thorough understanding of the .NET technologies involved. Strong backend skills where you can demonstrate your ability to apply these technologies, as well as deploy and maintain them will be crucial to success. Technologies we work with: C#, .NET Core, .NET Framework, TypeScript, JavaScript, Python, Node.js, REST/GraphQL APIs, React, AWS, Terraform Responsibilities Designing, writing, testing functionalities for a backend system written in C# Design software architecture between backend, frontend and mobile apps Deploying and maintaining microservices in AWS using Terraform Debugging and maintaining system on production used by consumers from several European countries Scoping and assessing the complexity of features Participating in sprint planning, daily sprints and meetings with product owners for grooming new features Collaborating with other team members and teams who depend on functionalities that you develop Recruiting and mentoring new team members Required qualifications 5+ years of production software development experience in C# engineer role Solid hands-on experience in .NET Core and .NET Framework technologies Experience in working with AWS and Terraform / CloudFormation Strong knowledge of DBMS like MS SQL / PostgreSQL / DynamoDB Expertise of REST APIs Strong hands-on experience of CI&CD processes Proficiency in OO design patterns, SOLID principles, Clean Code and solving architectural problems Computer Science degree AI Tooling usage Able to work with Agile methodologies such as SCRUM and/or Kanban Good communication and collaboration skills Self-motivation, proactive attitude Proficiency in English Nice to have Experience in developing Cloud and Infrastructure solutions with AWS and CI/CD processes supported by tools like Docker, Kubernetes, Jenkins, Terraform, CircleCI, GitlabCI, Datadog, etc. Exposure to frontend development in React Working experience with one of the object-oriented and/or functional languages such as Java, TypeScript, Elixir, C++, Golang, Erlang, Python, Kotlin