Ten Square Games is one of the largest Polish producers and publishers of free-to-play mobile games, which are played by 30 million users worldwide every month. The business was started out as a small project in a 10-square-meter apartment in Wroclaw and quickly developed into a company with almost 320 specialists. Among our biggest titles are: Fishing Clash, Hunting Clash, Let's Fish and Wild Hunt. 

We have reached a top spot in hobby games world-wide, now we are aiming not only to explore and innovate in casual gaming genres, but also in bringing our current titles to the next levels. In order to do that we are currently looking for people interested in joining a self-organizing, creative team of highly experienced and crazy talented experts, who contribute actively with ideas and together shape product vision. You will take full ownership of your role and become a part of a small, high performing team, working in a safe and friendly environment, with a collaborative and result-oriented mindset. 

We are looking for:

Senior Java Developer
Workplace: Wrocław

As a Senior Java Developer, you will become our partner in developing the most famous free-to-play mobile games. In order to make sure that our players get the best, most uninterrupted experience possible we need an expert to hop on board and put hands on design and implementation of solid, high performing architecture as a ground for moving our games to next levels.

We’re looking for a person who’s confident with expressing opinions that help to determine the future of the product. Someone who would draw conclusions from things that went wrong so that the team would benefit in the future, knowing how to overcome obstacles and be better prepared for any unexpected turn of events. We’re humble at TSG, so it’s fantastic if you are too. Oh, and pragmatism is of paramount importance to us. Interested? Come and join us!


  • Architecting the server-side of our games
  • Preparing backend for future workload growth (currently ~700-1000k DAU (Daily Active Users) and about 60-100k concurrent users)
  • Leading the distribution and upkeep of new games highly-scalable backends through maintenance and design
  • Troubleshooting and monitoring high-volume database systems
  • Prototyping and bringing up to life the new game ideas
  • Collaborating with a cross-functional team to achieve the best possible quality of our products
  • Actively contributing towards the best practice of reliability and availability
  • Providing technical leadership in back-end technologies (currently OpenJDK 15, Redis 6 (in cluster setup), Jedis, PostgreSQL 12, Google Protocol Buffers, Netty, Jenkins, Harbor, Sonar and many more - join us and put your vote in choosing tech stack we work with)


  • 5+ years of experience in server-side Java programming along with concurrency handling and distributed systems of high traffic
  • Good knowledge of algorithms and data structures
  • Demonstrate solid Linux shell experience along with scripting languages
  • Ability to respond and troubleshoot a range of issues accompanying the production environment to minimize downtime in games
  • Highly-committed and passionate about getting things done autonomously
  • Willingness to work as part of a team and having an open-minded attitude towards your colleagues and their work
  • Clear and open communication on the needs, wants and ideas
  • Hands-on approach
  • True passion for games
  • Very good command of English and willingness to work in an international environment


  • Experience in Redis and/or PostgreSQL databases;
  • Practice in roles like Technical Leader and/or Solution Architect
  • Knowledge of data serialization in client-server communication
  • Hands-on experience with microservices & cloud technologies
  • Familiarity with Jenkins, Maven, Python 3, Netty.


  • Direct impact on the final product
    and business direction.
  • Autonomy mode and freedom
    of making partnership decisions.
  • A friendly and mature
    working atmosphere.


  • Safe environment and setting that
    boost your EXP points and skills.
  • Communities of practice and educational books of your choice.
  • Conferences and themed events.


  • Working hardware matters
    – win or mac – take your pick.
  • Attractive remuneration based
    on experience and skills.
  • Easy accessible modern
    office in the center of Wrocław.


  • Private medical care, a life insurance
    program and a Multisport card.
  • Free lunch days, fresh fruits,
    refreshments in the office.
  • Assistance in relocation for you and your family and a relocation package.







Our high scores:

  • 30 million users worldwide every month.
  • 280 million game downloads.
  • One of the TOP 3 best earning companies
    listed in Polish GameDev.
  • Our brightest star – Fishing Clash – is among
    the 70 highest paid apps on Google Play.
  • 8 various gaming projects (form hobby
    to casual feminine games) under simultaneous
  • 2 game studios in Wrocław and Warsaw.
  • Consolidated revenue amounted
    to PLN 241 million last year.