Backend Software Developer (C#)

About the Position

Backend Software Developer (C#)

Join Reply Polska as a Backend Software Developer (C#) to lead backend development and technical delivery of a cloud-native microservices platform.

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.

Requirements

• 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.

We Offer

• Healthcare package
• Healthcare package for families
• Leisure package
• Language courses
• Conferences
• Trainings
• Books
• Financial bonus

About the Company

Reply Polska

Reply Polska is part of a network of highly specialized companies that support leading industrial groups in defining and developing business models to optimize and integrate processes, applications, and devices using new technology and communication paradigms, such as Artificial Intelligence, Big Data, Cloud Computing, Digital Communication, Internet of Things, Mobile, and Social Networking.

Additional Benefits

• Motivizer Benefits Platform: Choose and manage all your benefits in one place. You receive a budget (550 PLN monthly). You can choose medical care package, meal tickets, sports cards (we have Multisport and on preferential terms, we have membership cards to one of the most popular Gyms), cinema tickets, shop vouchers, discounts and many more.
• Regular and systematic further training opportunities - both internally and from external providers. We support your ongoing learning and development.
• Cooperation within an internal community is our everyday reality. We have networking events, coding challenges, and company parties for different occasions.

Location

• Katowice, Silesia, Poland

Salary

• 13,000 - 19,000 PLN per month

Employment Details

• Type: Full-time
• Contract: Employment contract
• Work Mode: Hybrid

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Develop yourself and the digital future – at Reply!

Open to Ukrainian candidates. Visa Services available.