Senior Backend Engineer (Payments)

Patrianna Limited; Polska; On-site; PLN 180,000 - 260,000; Full time

Job summary

Patrianna is seeking a Java Engineer to architect and build scalable backend services powering our global social gaming platform. You will contribute across the full development lifecycle, from design to deployment, delivering high-load systems capable of serving millions of players worldwide.

You will collaborate with product and dev teams in a fast-paced, AI-driven engineering culture that emphasizes code quality, reliability and rapid delivery.

Qualifications

• Strong Java core knowledge (Java 8+) and experience in building scalable backend services.
• Proven expertise with multithreading and high-load systems.
• Solid SQL knowledge and database optimization skills.
• Experience with Docker (docker swarm) and containerization.
• Excellent troubleshooting using production monitoring tools.
• Strong English communication, written and spoken.
• Experience with SPA and modern mobile/web technologies.

Responsibilities

• Write well-designed, testable and scalable code in a timely manner.
• Take part in the full development cycle from sprint planning to release cycles.
• Ensure smooth development and cooperation between dev teams and product owners.
• Build and maintain high-load systems that handle massive scale.
• Troubleshoot production issues using metrics, alerts, monitoring and profiling.
• Contribute to seamless scaling and automation initiatives.

Skills

Java Core (8+)

Multithreading

SQL & DB optimization

English communication

SPA & modern web tech

High-load systems

Tools

Docker Swarm

Kubernetes

Google Cloud Platform

Kafka

ElasticSearch

Ebean ORM

Flyway

Redis

Jenkins/ArgoCD

Job description

About Patrianna

Patrianna is a fast-scaling product development company headquartered in Gibraltar, with a dynamic, global team powering our growth. We operate at the intersection of technology and entertainment, building innovative solutions that shape the future of social gaming and deliver outstanding experiences to millions of players worldwide.

About Patrianna

Patrianna is a fast-scaling product development company headquartered in Gibraltar, with a dynamic, global team powering our growth. We operate at the intersection of technology and entertainment, building innovative solutions that shape the future of social gaming and deliver outstanding experiences to millions of players worldwide. We’re driven by speed, ambition, and bold ideas. At our core, we’re product creators and problem-solvers who thrive in a high-performance environment. We’re looking for exceptional talent—smart, adaptable, and motivated individuals eager to make an impact, scale business functions at pace, and continuously improve.

AI-Driven Engineering Culture

We are actively building an AI-driven engineering organization with a clear and deliberate stance: artificial intelligence is a core part of how we build and deliver software — not an experiment, not a trend, and not an optional add-on. AI is embedded into our engineering workflows, from system design and prototyping to refactoring, testing, and code review. We rely on AI to significantly influence how work is done and to accelerate delivery, while maintaining a high bar for code quality, system reliability, and architectural clarity. We expect engineers to be fully comfortable working in AI-driven environments and to treat AI as a primary productivity multiplier. Preference for AI-free workflows or resistance to AI-assisted development is NOT aligned with how we operate. Strong engineering judgment, architectural ownership, and accountability remain essential. AI amplifies our engineers — it does not replace responsibility for technical decisions.

The Role

You’ll architect and build scalable Java solutions that power our global social gaming platform, reaching up to 150 million customers worldwide.

What You Will Be Doing

• Write well-designed, testable and scalable code in a timely manner
• Take part in the full development cycle from sprint planning to release cycles
• Ensure smooth development and cooperation between dev teams and product owners
• Build and maintain high-load systems that handle massive scaleTroubleshoot production issues using metrics, alerts, monitoring and profiling
• Contribute to seamless scaling and automation initiatives

What We Are Looking For

• Extensive experience as a Java Engineer with strong Java Core knowledge (Java 8+)
• Proven expertise in multithreading and high-load systems
• Solid SQL knowledge and database optimization skills
• Strong experience with Docker (docker swarm) and containerization ecosystem
• Excellent troubleshooting skills with production monitoring tools (metrics/alerts/monitoring/profiling)
• Good English communication skills in speaking and writing
• Experience with SPA and modern mobile and web technologies

Bonus points for: Experience with Clickhouse, GCP, Kafka ecosystem, ElasticSearch, Ebean, Protobuf, InfluxDB/Grafana, Google Services integration, or wallet service maintenance.

Main technologies we use

• Java 25
• Spring Boot 4
• Spring 7
• Google Cloud Platform
• Kubernetes
• Kafka
• AlloyDB for PostgreSQL
• Spanner
• Ebean ORM
• Flyway
• Redis
• Quartz
• Websockets
• Retool
• Test Containers
• Locust for perf testing
• Jenkins/ArgoCD
• ELK/Sentry/Grafana
• Jira/Confluence/Slack/Bitbucket

Why you will love it

You’ll work in a high-pace, high-growth environment where your code directly impacts millions of users globally. Enjoy full remote flexibility, generous leave policy, and the chance to shape cutting-edge fintech solutions in social gaming. Plus, you’ll be part of a collaborative, ego-free team where your ideas matter and continuous learning is part of the culture.