
Senior Java Engineer
Espeo Software
full-time
Posted on:
Location Type: Hybrid
Location: Poznań • Poland
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Salary
💰 PLN 120 - PLN 165 per hour
Job Level
About the role
- 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
Requirements
- 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
Applicant Tracking System Keywords
Tip: use these terms in your resume and cover letter to boost ATS matches.
Hard Skills & Tools
JavaSpring Bootreactive programmingmicroservice architectureJPAHibernateAPI designCI/CDDockercloud environments
Soft Skills
technical leadershipmentoringcross-team collaborationcommunicationinfluencingproblem-solvingownershipobservabilityoperational excellencecontinuous improvement