Senior Java Server Developer

High 5 Games

contract

Posted on: 2/7/2026

Location Type: Remote

Location: Bulgaria

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About the role

Design and build the heart of H5G games and product platform
Propel H5G to the top tier of social gaming through adoption and application of the latest in Server side, Big Data and AI technology
Be a key contributor to aspects of design and delivery of all H5G Server Systems, Services and Data Stores
Analyze and optimize application performance, identify bottlenecks, and implement solutions to improve speed and efficiency
Develop and implement unit, integration, and system tests to ensure the quality and reliability of the code; understanding and applying various testing methodologies (TDD, BDD)

6+ years of hands-on Java development
Strong familiarity with Java 11/17+
Experience with REST API concepts and Spring Boot 2.5+
Expertise with REST API Concepts and Spring Boot 2.5+ Framework, Tomcat, K8s, Docker ecosystem
5+ years of design and delivery of high volume highly available back end infrastructures – Telcos / Trading / AdTech systems, etc.
Excellent understanding of enterprise architecture patterns, UML
Gaming or Equity trading server side experience is a big plus
Demonstrated experience delivering systems at large scale (20K+ mps) using Kafka and Hazelcast
In depth understanding of the Distributed System Concepts: Leadership, Consensus, In-Sync Replicas, Partitioning
Strong understanding of key security concepts and patterns
Good understanding of enterprise and mobile facing systems architecture
Experience with SQL and No-SQL DBs, specifically with Cassandra and MySQL
Experience with Real Time Stream Analysis
Experience with ML and AI modeling is a big plus

Benefits

Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills & Tools

JavaJava 11Java 17REST APISpring BootTomcatKubernetesDockerSQLNo-SQL

Soft Skills

leadershipanalytical skillsproblem-solvingcommunication