Senior Java Developer

Engineering & Development
|
Senior
Senior
Montenegro
Serbia
Slovakia
|
Montenegro
Serbia
Slovakia
open
February 10, 2026

About the company

First Line Software works with some of the worlds top businesses and organisations in industries like healthcare, real estate, data engineering, warehouse automation, retail digitalisation, mobile app development, and e-commerce. Our projects are as varied as our people, and our people are as talented as they come.

We prefer working as a transparent and supportive team, who shares our knowledge as well as our success.

Lets see what we can create together!

The project and your role

We are looking for a Senior Java Developer to help improve and grow an existing software platform. This platform is used to deliver advanced orthodontic devices and digital treatment systems to patients.

In this role, you will work on an important medical project. Your main task will be to develop backend services for a growing number of users worldwide. You will work directly with the client’s engineering team to make sure the platform is reliable, fast, and can handle a lot of traffic.

Key Responsibilities

  • Design and implement complex backend features and services to support the continued growth of the client platform.
  • Actively participate in architecture and technical decision making to ensure long-term system health.
  • Support and extend the existing platform functionality while identifying opportunities for modernization.
  • Maintain high code quality through rigorous code reviews and quality control standards.
  • Collaborate closely with the client’s engineering team to align on technical goals and delivery timelines.
  • Troubleshoot system issues and implement performance improvements to ensure a seamless user experience.

‍

Your skills

Essential Qualifications (Must Haves):

  • Extensive experience in Java engineering at a senior level, with a deep understanding of the language and its ecosystem.
  • Strong expertise in system design and backend architecture for distributed, high load production systems.
  • Proven track record of building and maintaining robust REST APIs and working with relational databases using SQL.
  • Proactive and independent contributor mindset with the ability to take ownership of technical challenges.
  • Excellent communication skills and experience working directly with client-side engineering teams.

Desired Skills & Knowledge (Nice to Haves):

  • Experience working within a microservices architecture.
  • Familiarity with cloud platforms, specifically AWS.
  • Hands-on experience with containerization and orchestration using Docker and Kubernetes.
  • Understanding of modern CI/CD pipelines and automated deployment workflows.

‍

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What we can offer

The FLS difference

  • Our modern stack projects are the right mix of exciting and challenging
  • Gain access to our diverse range of training programs, courses, and certifications;
  • Choose your work style - remote, on-site or hybrid in one of our stunning offices. We offer the freedom of flexible working hours.
  • Enhance your language skills with our corporate English classes
  • Work from anywhere and explore the world with our Workation program
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Our Hiring Process

Getting started with us

Here's what you can expect when you send us your application

Step 0

Tech Talent Hunt

Be scouted or apply for your role

Step 1

Meeting & Connecting

Our first step to building lasting relationships

Step 2

Uncovering Potential

Your HR interview

Step 3

The Code Challenge or Technical Interview

It's time to show what you can do best!

Step 4

Client’s Interview

Demonstrating expertise to our future partners

Final

The Last Piece of the Puzzle

Job offer to finalize our tech team

Join our team of innovative thinkers

Apply now!

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First Line Software, 2025

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