Senior Java Developer

ComeOn Group; Katowice; On-site; PLN 240,000 - 320,000; Full time

Job summary

A leading iGaming company is seeking a Java developer to enhance its gambling platform. The role includes working within a modern technology stack, collaborating with various teams, and contributing to both front-end and back-end development. The ideal candidate has over 6 years of experience with Java and proficient in SQL. This position offers a competitive salary, a hybrid work model, and up to 40 remote working days per year, promoting a vibrant and innovative workplace culture.

Benefits

Competitive remuneration package

Company bonus scheme

Quarterly team events

Home workstation setup bonus

Up to 40 remote workdays per year

Qualifications

• 6+ years of experience building web applications and services.
• Strong expertise in Java, considering it a craft.
• Proficient in SQL and database management.

Responsibilities

• Develop and implement new features in collaboration with the business side.
• Work closely in a team-oriented environment across a comprehensive technology stack.
• Refactor legacy codebases and enhance them incrementally.

Skills

Java mastery

Legacy refactoring

SQL knowledge

Agile collaboration

Communication in English

Tools

Kafka

Docker

MongoDB

MySQL

React

Spring Boot

Job description

ComeOn Group in short

Founded in 2008, ComeOn Group is a leading global player in the rapidly growing iGaming market. Having launched its first online brand in 2010, ComeOn Group is running a wide range of exciting brands across multiple markets. Operating more than 20 brands on its proprietary platform providing a secure, innovative and entertainment‑led player experience across casino and sports betting. ComeOn Group is an international employer within the iGaming industry and has over 500 talented employees across 7 main locations.

Location: Katowice, Poland / Stockholm, Sweden

The Website

The ComeOn.com platform is a service‑oriented web application where stability, high performance, and user experience are our top priorities. Our frontend is architected as a modern, responsive multi‑device solution, leveraging the latest reactive frameworks and sophisticated client‑side state management.

On the backend, our business logic relies on a robust, proprietary system supported by leading open‑source frameworks and secure integration modules. Our data layer consists of high‑availability distributed clusters and dedicated warehousing solutions. We are continuously exploring emerging technologies and innovative architectural patterns to deliver the most efficient and competitive gaming experience to our customers.

Responsibilities

We are looking for a Java developer to help us build the best gambling site on the Internet. You will work with all parts of the system and all stages of the development process in a team oriented environment. This includes integrations with external systems, development of internal components and subsystems, and potentially also frontend development for mobile and desktop devices. You as a developer will work closely together with the business side of the organization to develop and implement new features. You will be working across a broad and up‑to‑date technology stack, including Java, Kafka, Docker, MongoDB, MySQL, React, and Spring Boot. The role also involves working with a large, long‑standing codebase, assessing its structure, and introducing modern, well‑scoped improvements through safe, incremental changes.

About you

We are looking for a seasoned engineer who views Java not just as a tool, but as a craft. You likely have 6+ years of experience building web applications and services, but more importantly, you understand that code is meant to be read by humans as much as it is executed by machines.

Your Core Skills & Mindset

• Mastery of Java: You bring deep expertise and genuine passion for the language.
• Legacy to Modern: You are skilled at working with legacy codebases, refactoring them, and bringing them "under test" with confidence.
• Database Proficiency: You have solid knowledge of SQL and data management.
• Agile Collaboration: You thrive in a communicative environment, working closely with Developers, QAs, and Product Owners to deliver value.
• Curiosity: You are eager to discuss ideas, learn from others, and share your own knowledge with the team.
• Communication: You possess an excellent command of written and spoken English.

So what can you expect from ComeOn as a place of work?

A competitive remuneration package inc. a company bonus scheme! 💰

Fantastic quarterly team events and weekly company events 😎

A one‑time bonus to help you set up a comfortable workstation at home (we’re truly Hybrid!)

On top of our Hybrid work arrangement, up to 40 days a year to work fully remote from anywhere 🌎

At ComeOn, we have adapted a Hybrid Work model which means that we offer our employees an option to pick their workstation for the day. Want to work from the office a few days a week and some days from home? That’s totally fine with us! ComeOn is known for their inviting and vibrant offices that offer creative areas for collaboration and desk set‑ups designed for a Hybrid Work model. When you visit one of our offices you will always be welcomed by a friendly face that will take good care of you. It’s our curiosity that drives our innovative business forward and we work hard in a run‑together spirit and we always make sure to top it up by having fun! You will not regret picking ComeOn as your next place of work.

At ComeOn Group we value diversity and we take concrete action to ensure fairness in our recruitment process. We are committed to assess candidates on their merit without discriminating against any applicant for whatever reason that is protected by law. We truly value you, as you are.

Want to know more about us just visit our website www.comeon-group.com or any of our social media channels to take a deep dive into our culture!