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Backend Software Developer (C#)
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Offer summary

(Summary generated by AI based on the full job description)

The project involves machine learning and Data Science focusing on cloud technologies and data-driven business models. Key technologies include C#, .NET, Python, AWS (ECS, Lambda, Cognito), and Terraform. Responsibilities cover leading microservices backend development, managing cloud infrastructure, coordinating knowledge transfer, and enhancing CI/CD processes. Benefits include private medical care, training budgets, language courses, and ongoing professional development support.

you can start ASAP

Backend Software Developer (C#)

Company: Reply Polska Sp. z o.o.

from: 7 July 2026
to: 6 August 2026
13 000 - 19 000 złgross/ mth.contract of employment (full-time)
Offer parameters
level:mid
working mode:hybrid
Katowice, Silesian
Katowice, SilesianWrocławska 54View on map

Requirements

Operating system

Windows

Our 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.

Your 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.
Company

About the project

Machine Learning Reply offers customized end-to-end Data Science solutions, covering the entire project life cycle – from initial strategy consulting, data architecture and infrastructure topics, to processing data with quality assurance using Machine Learning algorithms. Machine Learning Reply has extensive expertise in the field of Data Science in all key industries of German HDAX companies.
Machine Learning Reply empowers clients to successfully introduce new data-driven business models and to optimize existing processes and products – with a focus on distributed open source and cloud technologies. With the Machine Learning Incubator, the company offers a program to train the next generation of decision-makers, data scientists and engineers.

Development opportunities we offer

  • development budget
  • external training
  • intracompany training

What we offer

  • 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 you language skills and learn new ones!
  • 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.

Benefits

  • private medical care
  • sharing the costs of foreign language classes
  • sharing the costs of professional training & courses
  • integration events
  • extra social benefits

Recruitment stages

  • 1.
    Tech interview
  • 2.
    HR interview

Reply Polska Sp. z o.o.

Reply is made up of a network of highly specialised companies, which support leading industrial groups in defining and developing business models to optimise 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.

This is how we work

Backend Software Developer (C#)
13k–19k zł / mth. (CoE)
I apply to:
Reply Polska Sp. z o.o.
Katowice, Silesian
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