Senior Backend Engineer - Java/Spring Boot

I’m helping Staffinit find a top candidate to join their team full-time for the role of Senior Backend Engineer - Java/Spring Boot.

You'll define and drive backend architecture strategy, shaping engineering standards and mentoring teams.

Compensation:

EUR 7K - 12K/month

Location:

Remote (for Finland residents)

Mission of Staffinit:

"Our mission: to connect talent. empower businesses. We work with clients across industries, helping them build teams that make a difference, and support professionals in finding roles where they can thrive. At our core, we combine deep recruitment expertise with a human-centred approach—ensuring that each placement aligns skills, culture and ambition.

"

What makes you a strong candidate:

• You have +5 years experience in Spring Boot, Performance tuning, Java, API design.
• English - Fully fluent

Responsibilities and more:

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.

Required Skills:

• 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.

The provided monthly salary is gross (taxes included).