Senior Java Developer

📍 Warsaw (Onsite – near Metro Plac Wilsona)

💼 B2B / Freelance

About Silk Software House

Silk Software House builds and maintains mission-critical backend systems for fintech, payments, and large-scale platforms. We value strong engineering judgment, ownership, and long-term cooperation over short-term delivery pressure.

Your Role

As a Senior Java Developer, you’ll take technical ownership of backend services, influence architectural decisions, and mentor other engineers. You’ll work directly on complex domains where performance, security, and reliability matter.

Responsibilities

• Design and implement backend architectures using Java 11+ and Spring

• Lead development of microservices and APIs

• Optimize performance, scalability, and data consistency

• Work deeply with Hibernate, transactions, and database internals

• Review code, mentor developers, and set engineering standards

• Collaborate with DevOps on deployments and observability

Requirements

• This role requires full-time onsite work (no remote or hybrid options). Candidates must be willing and able to work from our office near the Plac Wilsona metro station

• 5+ years of commercial experience as a Java Developer

• Strong commercial experience with Java & Spring (Boot, Security, Data)

• Deep knowledge of Hibernate ORM, SQL databases, and JVM behavior

• Experience designing scalable, maintainable backend architectures

• Proficiency with CI/CD, Git, Gradle, and production debugging

• Effective use of AI-assisted development tools (ChatGPT, Claude, Cursor, Grok)

• English at B2+ level

  
  

Nice to Have

• Event-driven architecture (Kafka, queues)

• Cloud-native systems (AWS/GCP/Azure)

• Kubernetes, Docker, observability tools

• Experience in fintech or high-traffic systems

Rates (B2B)

• 120–160 PLN / hour

Recruitment Process

1. Intro call (30 min)

2. Senior-level technical interview

3. Architecture & project discussion

4. Offer

Tech Stack

• Java: Advanced

• Spring Boot: Advanced

• Hibernate: Advanced

• PostgreSQL: Advanced

• Solid: Advanced

• DDD: Advanced

• REST API: Advanced