Senior Java Software Developer — Distributed Systems
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EngineeringRemote / Hybrid 3 min read
Senior Java Software Developer — Distributed Systems
Distributed backend systems in Java: microservices, streaming, multithreading and mature production ownership.
Employment Full-time
Location Warsaw / Remote (EU)
Work mode Remote-first / Hybrid in Warsaw
Job Overview
We are developing critical backend systems running in a distributed environment. There are many integrations, data flows and processes that require high reliability. We need someone with strong Java experience who understands multithreaded systems, microservices, streaming and production-grade application operations.
This is a role for a senior engineer who can take ownership of an important system area, work with stakeholders and keep the technical quality high at the same time.
What You Will Build
- Distributed backend applications in Java.
- Microservices and components based on Spring Boot.
- Integrations with data systems and external services.
- Streaming and event-driven solutions.
- Automation, monitoring and alerting mechanisms.
- Components deployed in containerized environments.
- Systems designed for stability, auditability and business continuity.
Responsibilities
- Design and develop backend applications in Java.
- Participate in strategic technology initiatives.
- Build scalable and multithreaded components.
- Design microservices, APIs and integrations.
- Work with Kafka and streaming-based solutions.
- Implement monitoring, automation and operational mechanisms.
- Collaborate with teams across multiple locations.
- Analyze requirements and translate them into technical solutions.
- Plan, coordinate and support changes in test and production environments.
- Ensure code quality, security and maintainability.
Technology Stack
Backend
Java, Spring Boot, Hibernate, REST API, microservices
Concurrency
multithreading, async processing, performance tuning
Messaging
Kafka, streaming, event-driven architecture
Cloud / platform
Kubernetes, OpenShift, public cloud
Data
SQL, relational databases, database objects
Observability
ELK, monitoring, alerting, metrics
DevOps
Docker, CI/CD, deployment automation
Architecture
12-factor apps, OO design, design patterns, integration patterns
Requirements
- At least 7-8 years of commercial Java development experience.
- Strong Java and Spring Boot skills.
- Experience with multithreaded and scalable applications.
- Knowledge of Hibernate, REST API and microservices.
- Experience with Kafka or similar streaming solutions.
- SQL and database experience.
- Experience with Kubernetes, OpenShift or public cloud.
- Understanding of 12-factor app design.
- Ability to work with a high level of ownership.
- Very good English communication skills.
Nice to Have
- ELK stack and observability.
- Experience with business-critical systems.
- Experience in regulated or enterprise environments.
- Deployment automation knowledge.
- Performance tuning experience.
- Practice working with globally distributed teams.
- Ability to collaborate with demanding stakeholders.
What We Offer
- Remote-first setup and flexible working hours.
- Work on systems with major business importance.
- Participation in decisions about architecture, quality and delivery practices.
- Mature engineering environment.
- Budget for equipment, training and certifications.
- Private medical care and benefits package.
- Recruitment without unnecessary delays or unrealistic take-home assignments.
Who We're Looking For
We are looking for someone who understands that a senior Java engineer is not just someone who knows Spring.
It is someone who can build distributed systems, understands production, takes responsibility for delivery and can communicate with both engineering and business stakeholders.