Senior Java Backend Engineer — Scalable APIs, Docker/K8s

DCG; Warszawa; On-site; PLN 240,000 - 360,000; Full time

Benefits offered by this job

Private medical care

Co-financing for sports card

Dedicated consultant

Job summary

DCG in Warszawa is seeking a Senior Backend Developer (Java) to design, build and maintain robust backend services and RESTful APIs using Java and Spring Boot. You will create scalable data models, integrate with relational and NoSQL databases, and work closely with frontend teams to define API contracts.

You will deploy in containerized environments (Docker, Kubernetes or OpenShift), contribute to secure coding standards, write unit and integration tests, and join CI/CD pipelines to automate

Qualifications

• 8+ years of professional backend software development experience.
• Strong commercial experience with Java.
• Hands-on experience with Spring Boot.
• 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 and Spring Boot.
• 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

Spring Boot

REST APIs

CI/CD

Unit Testing

Agile

OO Principles

Software Design

English

Tools

Docker

Kubernetes

OpenShift

SQL

NoSQL

Job description

DCG in Warszawa is seeking a Senior Backend Developer (Java) to design, build and maintain robust backend services and RESTful APIs using Java and Spring Boot. You will create scalable data models, integrate with relational and NoSQL databases, and work closely with frontend teams to define API contracts.

You will deploy in containerized environments (Docker, Kubernetes or OpenShift), contribute to secure coding standards, write unit and integration tests, and join CI/CD pipelines to automate