Senior Java Engineer - Poland

Senior Java Engineer

SKILLS: Java (17+) | Spring Boot | Microservices | CI/CD | API

B2B PLN 120 - 165/ Hour 💰

LOCATION: REMOTE, POLAND (occasional travels to Łódź)

START DATE: ASAP

Key Services and Requirements: A Roadmap to Your Professional Success 🚀

Scope of services:

• Define and drive the long-term backend architecture strategy across multiple teams, ensuring clarity, scalability, and alignment

• Establish and evolve engineering standards, patterns, and best practices for Java Spring Boot development

• Lead cross-team technical initiatives end-to-end, aligning stakeholders across engineering, product, and design

• Act as a technical leader and mentor for senior and mid-level engineers through code reviews, design discussions, and hands-on guidance

• Collaborate with Product, Frontend, Design, and DevOps leadership to shape the technical roadmap

• Proactively identify and address systemic risks such as performance issues, scalability limits, and security gaps

• Promote a culture of ownership, observability, and operational excellence

• Evaluate and prototype new architectural approaches, influencing future tooling, service design, and engineering practices

• Support continuous improvement of backend systems in terms of reliability, maintainability, and performance

Here’s a set of skills we require:

• 8+ years of professional software engineering experience

• At least 5 years of hands-on experience building and operating backend systems using Java and Spring Boot

• Expert-level knowledge of: Java (17+) Spring Boot, including advanced topics such as reactive programming, custom configurations, security, and performance tuning

• Strong experience designing and evolving microservice architectures, including: service decomposition, inter-service communication (REST, GraphQL, messaging), shared components and codebase organization

• Deep understanding of data persistence, including: JPA/Hibernate, relational database design, query optimization, caching strategies (e.g. Redis)

• Strong knowledge of API design principles (RESTful); familiarity with GraphQL is beneficial

• Solid experience with testing strategies across all levels (unit, integration, end-to-end)

• Hands-on experience with: CI/CD pipelines (e.g. GitHub Actions), containerization (Docker), cloud environments (e.g. AWS)

• Experience with observability practices, including logging, metrics, tracing, and alerting

• Proven ability to work across teams and influence technical direction without direct authority

• Strong communication skills — able to explain complex technical concepts to both technical and non-technical stakeholders

Nice to have:

• Experience defining and scaling engineering standards across multiple teams or domains

• Familiarity with event-driven architectures and messaging systems

• Practical experience modernizing or refactoring legacy systems

• Active usage of AI-assisted development tools (e.g. Copilot, Cursor) as part of daily workflow

• Experience shaping engineering culture and mentoring at scale

• Exposure to high-availability, high-traffic production environments