Software Engineer (java)

Slovakia·Košicemid

Software EngineerSoftware Engineering

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Quick Summary

Key Responsibilities

Design, implement, and maintain Java-based backend services, components,

Technical Tools

Software EngineerSoftware Engineering

Life at Ness

At Ness, people come first. Here, you'll be part of a vibrant team that values curiosity, innovation, and growth. We work with industry-leading clients on projects that truly make an impact while supporting every team member in carving out their unique career path. With resources for learning, certifications, and hands-on experiences, Ness offers you more than just a job—it’s a place where your ideas, ambition, and well-being matter.

The Role

We are looking for an experienced Java Developer to join a project focused on integrating third-party systems for large-scale data collection and processing.

The platform is built on an event-driven architecture, designed to handle high data volumes in real time with strong guarantees around scalability, reliability, and performance. You will join a small, senior-level team with a high degree of technical ownership, autonomy, and direct influence on architectural and technical decisions.

While the role is strongly focused on backend development, we value engineers who are open to contributing beyond their core area when needed—whether that’s supporting DevOps or collaborating on cross-cutting initiatives. Familiarity with AI technologies is a strong plus, as we continue integrating intelligent capabilities into our products and workflows.

This role is well-suited for someone who enjoys working in complex systems, taking end-to-end responsibility, and continuously improving both the product and the way it is built.

Salary: from 2.300 EUR/month, depending on skills and experience + benefits. The final offer for the selected candidate will reflect the candidate´s comprehensive assessment, skills, and past work experience.

Location: Slovakia only

What you'll do:

Design, implement, and maintain Java-based backend services, components, and integrations
Collaborate across a distributed Agile organization (Scrum or Kanban) to deliver outcomes
Take ownership of high-complexity technical tasks, from design through production
Actively support quality assurance, including test automation, integration testing, and code reviews
Contribute to and evolve architecture, development standards, and best practices
Participate in architectural discussions and technical decision-making
Continuously propose and drive improvements in system design, performance, and developer experience

What you'll bring:

Experience & Professional Profile

Experience designing high-availability, scalable, and high-performance backend systems
Hands-on background in high-volume data processing and distributed systems
Solid understanding and practical use of Agile methodologies
Experience applying Test-Driven Development (TDD) and modern QA practices
Familiarity with CI/CD principles, pipelines, and automated delivery
Proven ability to work effectively in a corporate, cross-functional environment
Self-driven, resilient, and comfortable operating in complex and evolving systems
Team-oriented mindset with the ability to influence and motivate others
Very good command of spoken and written English

Key skillsets:

Java 11–21 with knowledge of the JVM and language fundamentals
Spring ecosystem: Spring Boot, Spring Web / Web Flux (nice to have), Spring Data
Build tools: Maven and/or Gradle
Hands-on experience with event-driven architectures
Experience with Azure (preferable), alternatively Amazon Web Services
Infrastructure as a code: Terraform, Ansible
Docker and Kubernetes
Experience with Apache Kafka (or similar message brokers)
Strong understanding of REST APIs (gRPC is a plus)
Experience with relational and NoSQL databases (e.g., PostgreSQL, MySQL, MongoDB (Cosmos))

Nice to have:

Experience with Akka (Classic or Typed) is a strong plus
Familiarity with reactive programming (e.g., Project Reactor, Akka Streams)
Exposure to event-driven architectures, including event sourcing
Hands-on experience with CI/CD pipelines (GitHub Actions, GitLab CI, or Azure DevOps)
Working knowledge of security concepts such as OAuth2, JWT, and Basic Authentication

While many of our roles involve just 2–3 steps, some client processes may include additional conversations. Regardless of the path, we aim to keep every step transparent and respectful of your time.

Ready to Start Your Journey?