Senior Software Engineer (Poland)

StrongSD GmbH; Polska; Hybrid; PLN 210,000 - 290,000; Full time

Benefits offered by this job

Medical insurance

Free corporate English classes and/ or

Mentorship program

Tech talks and trainings

Flexible compensation package

Job summary

StrongSD GmbH is seeking a backend engineer with a deep understanding of distributed systems to join our team in Poland. You will design, implement, and maintain secure, scalable services in Java/Spring, collaborating with cross-functional teams to deliver end-to-end solutions from concept to deployment.

You will work across the stack, from backend services to infrastructure components like load balancers and Kubernetes, write maintainable code, participate in on-call rotations, and contribute

Qualifications

• 5+ years of backend development experience with Java and Spring.
• Proven track record shipping production-grade systems in cloud environments.
• Experience with distributed systems and messaging frameworks like Apache Kafka (AWS MSK).
• Strong containerization and orchestration with Kubernetes; deployment workflows.
• Familiarity with observability tools and incident response best practices.
• Excellent communication and collaborative mindset.

Responsibilities

• Design, implement, and maintain secure, scalable backend services.
• Collaborate with cross-functional teams to deliver end-to-end solutions.
• Work across stack from backend to infrastructure components like ALB/NLB and Kubernetes.
• Own projects, driving architecture, design, and implementation decisions.
• Write clean, tested Java code; contribute Python automation when needed.
• Monitor production systems, respond to incidents, and improve reliability and performance.
• Participate in on-call rotations and code reviews; mentor junior engineers.

Skills

Java

Spring ecosystem

Distributed systems

Kafka

Kubernetes

Cloud environments

Python scripting

On-call experience

Tools

AWS MSK

Containers

CI/CD

Job description

You are a backend engineer with a deep understanding of distributed systems and microservices architecture.

You value simplicity and effectiveness, and you’re excited by the opportunity to make a meaningful impact. You can reason through trade-offs, build for scale,and adapt quickly to evolving priorities.

Requirements

• 5+ years of backend development experience with a strong command of Java and the Spring ecosystem.
• Proven track record of shipping production-grade systems in cloud environments.
• Experience with distributed systems and messaging frameworks such as Apache Kafka (via AWS MSK).
• Strong understanding of containerization, orchestration (Kubernetes), and deployment workflows.
• Familiarity with observability tools and incident response best practices.
• Excellent communication skills and a collaborative mindset.

Duties:

• Design, implement, and maintain backend services that are secure, scalable, and mission-critical.
• Collaborate with cross-functional teams to deliver end-to-end solutions from concept to deployment.
• Work across the stack from backend systems to infrastructure components such as ALB/NLB, and Kubernetes.
• Take ownership of projects, driving architecture, design, and implementation decisions.
• Write clean, maintainable, and well-tested code in Java, and contribute to automation and tooling in Python when necessary.
• Monitor production systems, respond to incidents, and continuously improve system reliability and performance.
• Participate in On-Call rotation to ensure high availability and rapid response to production issues.
• Participate in code reviews, knowledge sharing, and mentoring of junior engineers.
• A competitive salary and flexible compensation package
• Professional development tools (mentorship program, tech talks and trainings)
• Medical insurance
• Free corporate English classes and speaking clubs with a native speaker