BACKEND SOFTWARE DEVELOPER (C#)

Reply Group; Katowice; On-site; PLN 150,000 - 210,000; Full time

Benefits offered by this job

Medical care

Benefits platform

Training opportunities

Language courses

Company events

Budget for personal benefits

Job summary

Reply Group is looking for a Senior Backend Developer in Katowice, Poland. You will lead backend development for a cloud-native microservices platform and manage AWS infrastructure. Ideal candidates have 4+ years in software development and experience with AWS and microservices.

Benefits include medical care, training opportunities, and a flexible benefits platform to manage your perks. You will need good communication skills in English and Polish, along with a degree in Computer Science or related field.

Qualifications

• 4+ years of backend software development experience.
• 2+ years in a Senior Engineer role.
• Proven hands-on experience with AWS cloud services.
• Strong understanding of microservices and cloud-native architecture.

Responsibilities

• Lead backend development of a cloud-native microservices platform.
• Design and maintain scalable backend services.
• Manage AWS-based infrastructure.
• Develop Infrastructure as Code using Terraform.

Skills

C#

.NET

AWS cloud services

Python

Terraform

GitHub Actions

Microservices architecture

Stakeholder management

English

Polish

Education

Degree in Computer Science, Engineering, or related field

Tools

AWS

Terraform

Job description

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

• MEDICAL CARE
• BENEFITS PLATFORM
• TRAINING OPPORTUNITIES
• LANGUAGE COURSES PLATFORM
• COMPANY EVENTS
• Motivizer Benefits Platform to 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.
• Language Courses –you'll have access to a multi-language learning platform enabling you to practice your language skills and learn new ones!
• Regular and systematic furthertraining opportunities - both internallyand from external providers. We support your ongoing learning and development.
• Cooperation within an internal community is our everyday reality. We havenetworking events, coding challenges, and company parties for different occasions.

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.