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 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.

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.

About Machine Learning Reply

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. 

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Katowice, Poland

9,000 - 13,000 PLN

🏢 Summary: The offer is for a Java Developer role focused on building and maintaining cloud-native microservices using modern open-source technologies. You will design and implement new features in collaboration with cross-functional teams, contribute to technical standards, and create technical documentation. The role involves working in an Agile environment with DevOps practices and AWS-based infrastructure. 🗂️ Requirements: Degree in computer science, mathematics, physics or related field, Minimum 2 years of experience as Java Developer, Experience with Maven, Git or Subversion, Jenkins, Knowledge of DevOps and continuous delivery concepts, Experience with clean code and TDD practices, Experience working in Agile methodologies, Fluent Polish, Very good English skills 📃 Skills: Java, Microprofile, Docker, Kubernetes, PostgreSQL, Kafka, JMeter, REST, Quarkus, AWS, EKS, RDS, MSK, Redis, EC2, Linux, Maven, Git, Subversion, Jenkins, SQL, OpenShift, Apache, Nginx, Jira, Confluence 🏢 Description: Responsibilities Together with our international team, you will develop using modern open-source frameworks and tools such as J2E, microservices, Docker, SQL, Kubernetes (OpenShift is a plus), Maven and reverse proxy technologies (e.g. Apache, Nginx) You design new innovative features in collaboration with product owners, business analysts and other stakeholders and are responsible for their implementation You actively support the implementation and further development of standards You are responsible for the creation of technical concepts and documentation Benefits Motivizer Benefits Platform to choose and manage all your benefits in one place. You receive a budget (550 PLN monthly). You can choose a 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 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. Qualifications Successfully completed studies in (business) computer science, mathematics, physics or a similar qualification You have at least 2 years of professional experience as a Java developer Experience working with development environments such as Maven, Git/Subversion and Jenkins You are familiar with concepts such as DevOps, continuous delivery, clean code, TDD and agile methods You are characterized by a very analytical and solution-oriented way of thinking in combination with strong leadership qualities Technology: Java, Microprofile, Docker, Kubernetes, Postgresql, Kafka, Jmeter, Rest Services, Quarkus Platform and Hosting: AWS -> EKS, RDS, MSK, Redis, EC2, Secret Manager OS: Linux any distro Methodology: Agile development Project management tools: Jira, Confluence Remote working is allowed with the need to come to the office for the first period every day for 2 weeks and afterwards 1-2 days per week, plus when requested for project reasons (or events for the internal roles) Fluent Polish and very good communication English skills round off your profile - German is a plus, but not mandatory About Riverland Reply Riverland Reply is specialized in consulting end-to-end customer-oriented solutions and strategies. In addition, Riverland Reply supports its customers in strategic IT decisions, implementation of defined solutions and production execution. The company combines in-depth knowledge of digital Customer Experience with the full potential of cloud native technologies. This expertise allows Riverland Reply to remove the barriers between a product-based technology and a full custom implementation. Knowing that Customer Experience in the digital era must be highly flexible to be adapted to different industries, Riverland Reply advises clients in automotive, transportation, logistics and finance industry. The strong partnership and close collaboration with Oracle made Riverland Reply the experts of Oracle’s Customer Experience products.

Technology

Reply Polska Sp. z o. o.

Senior Software Developer - Cloud Native / Java

Senior

Hybrid

Katowice, Poland

13,000 - 22,000 PLN

🏢 Summary: Development role focused on building and maintaining Java-based microservices using modern cloud-native and DevOps technologies. The position involves designing and implementing new features, creating technical concepts, and mentoring junior developers within an agile team. Work includes collaboration with stakeholders and deployment on AWS-based infrastructure with containerized environments. 🗂️ Requirements: Degree in computer science, mathematics, physics or similar field, Minimum 3 years of professional experience as Java developer, Experience with Maven, Git or Subversion, Jenkins, Knowledge of DevOps and continuous delivery concepts, Understanding of clean code and TDD principles, Experience working in agile development environments, Experience with microservices architecture, Very good English communication skills, Willingness to work in hybrid model with weekly office visits 📃 Skills: Java, Microprofile, Quarkus, Docker, Kubernetes, Openshift, PostgreSQL, Kafka, JMeter, REST, AWS, EKS, RDS, MSK, Redis, EC2, Linux, Maven, Git, Subversion, Jenkins, Apache, Nginx, SQL, Jira, Confluence 🏢 Description: Responsibilities Together with our international team, you will develop using modern open source frameworks and tools such as J2E, microservices, Docker, SQL, Kubernetes, Maven and reverse proxy technologies (e.g. Apache, Nginx) You design new innovative features in collaboration with product owners, business analysts and other stakeholders and are responsible for their implementation In our agile development teams, you act as a mentor for our junior Java developers You actively support the implementation and further development of standards You are responsible for the creation of technical concepts and documentation Benefits 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. Qualifications Successfully completed studies in (business) computer science, mathematics, physics or a similar qualification You have at least 3 years of professional experience as a Java developer Experience working with development environments such as Maven, Git/Subversion and Jenkins You are familiar with concepts such as DevOps, continuous delivery, clean code, TDD and agile methods You are characterized by a very analytical and solution-oriented way of thinking in combination with strong leadership qualities Technology: Java, Microprofile, Docker, Kubernetes, Postgresql, Kafka, Jmeter, Rest Services, Quarkus, Openshift as a plus Platform and Hosting: AWS -> EKS, RDS, MSK, Redis, EC2, Secret Manager OS: Linux any distro Methodology: Agile development Project management tools: Jira, Confluence Very good communication skills English round off your profile - German is a plus, but not mandatory You're open to a hybrid way of working with weekly visits in our Katowice office. About Riverland Reply Riverland Reply is the Reply group company specialized in consulting end-to-end customer-oriented solutions and strategies. The company combines in-depth knowledge of digital Customer Experience with the full potential of cloud native technologies. This expertise allows Riverland Reply to remove the barriers between a product-based technology and a full custom implementation. Knowing that Customer Experience (CX) in the digital area must be highly flexible to be adapted to different industries and markets. Riverland Reply advises his clients in how to approach the main CX, identity and access management challenges. The strong partnership and close collaboration with their partners Oracle and ForgeRock make Riverland Reply the experts of related CX products, identity and access management solutions.