Senior Backend Developer (Java / .NET) Java / .NET, Spring Boot, Docker

DCG; Polska; Hybrid; PLN 180,000 - 250,000; Full time

Benefits offered by this job

Private medical care

Co‑financing for the sports card

Dedicated consultant support

Job summary

DCG is seeking a Senior Backend Developer (Java / .NET) to design, develop, and maintain scalable backend services and RESTful APIs. You will work with Java or .NET, Spring Boot, Docker, Kubernetes/OpenShift, and collaborate with cross-functional teams in an Agile environment.

The role emphasizes secure coding, automated tests, CI/CD, data modeling with relational/NoSQL databases, and performance monitoring. Fluency in English is required; 8+ years of experience is expected.

Qualifications

• 8+ years of professional backend software development experience.
• Strong commercial experience with Java or .NET.
• Hands-on experience with Spring Boot or .NET Core / modern .NET.
• Strong experience designing and developing REST APIs.
• Experience with Docker and container orchestration platforms such as Kubernetes or OpenShift.
• Good knowledge of SQL and relational databases, including data modelling and query optimization.
• Experience with automated testing, including unit and integration testing.
• Familiarity with CI/CD pipelines and modern software delivery practices.
• Strong understanding of object-oriented programming and software engineering principles.
• Ability to work effectively in cross-functional Agile development teams.
• Fluency in English (both written and spoken).

Responsibilities

• Design, develop, and maintain backend services and RESTful APIs using Java or .NET
• Build scalable, reliable, and high-performance backend solutions for client-facing applications
• Design data models and integrate services with relational and NoSQL databases
• Collaborate with front-end developers to define API contracts and ensure seamless system integration
• Develop and deploy applications in containerized environments using Docker, Kubernetes, or OpenShift
• Apply secure coding standards and software engineering best practices
• Create and maintain unit and integration tests
• Integrate applications with CI/CD pipelines and automated deployment processes
• Monitor and optimize application performance, scalability, and reliability
• Troubleshoot technical and production issues and support their resolution
• Participate in technical design discussions, sprint planning, code reviews, and other Agile activities

Skills

Java

.NET

Spring Boot

REST APIs

CI/CD

SQL

NoSQL

OOP

Agile

English

Tools

Docker

Kubernetes

OpenShift

Job description

Position: Senior Backend Developer (Java / .NET)

As a recruitment company, DCG understands that every business is powered by experienced professionals. Our management style and partnership approach enable us to meet your needs and provide continuous support. Due to our ongoing growth and the large number of recruitment projects we undertake for our partners, we are currently looking for:

Senior Backend Developer (Java / .NET)

Responsibilities:

• Design, develop, and maintain backend services and RESTful APIs using Java or .NET
• Build scalable, reliable, and high-performance backend solutions for client-facing applications
• Design data models and integrate services with relational and NoSQL databases
• Collaborate with front-end developers to define API contracts and ensure seamless system integration
• Develop and deploy applications in containerized environments using Docker, Kubernetes, or OpenShift
• Apply secure coding standards and software engineering best practices
• Create and maintain unit and integration tests
• Integrate applications with CI/CD pipelines and automated deployment processes
• Monitor and optimize application performance, scalability, and reliability
• Troubleshoot technical and production issues and support their resolution
• Participate in technical design discussions, sprint planning, code reviews, and other Agile activities

Requirements:

• 8+ years of professional backend software development experience
• Strong commercial experience with Java or .NET
• Hands-on experience with Spring Boot or .NET Core / modern .NET
• Strong experience designing and developing REST APIs
• Experience with Docker and container orchestration platforms such as Kubernetes or OpenShift
• Good knowledge of SQL and relational databases, including data modelling and query optimization
• Experience with automated testing, including unit and integration testing
• Familiarity with CI/CD pipelines and modern software delivery practices
• Strong understanding of object-oriented programming and software engineering principles
• Ability to work effectively in cross-functional Agile development teams
• Fluency in English (both written and spoken)

Nice to have:

• Experience with event-driven or messaging architectures, e.g. Kafka or MQ
• Experience with cloud-native application development
• Knowledge of NoSQL databases
• Experience within financial services, fund administration, or transfer agency environments

Offer:

• Private medical care
• Co‑financing for the sports card
• Constant support of dedicated consultant

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