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(Senior) Java Developer - Freelance at Netguru. We are looking for a highly experienced . Senior Backend Engineer.  to join our . client’s engineering team. . The role focuses on building scalable, secure, and high-performance systems using Java and AWS cloud technologies. You will work in a cross-functional Agile environment, closely collaborating with architects, DevOps engineers, and business stakeholders.. This is a fully remote position.. Planned start: October. Salary ranges: up to 45EUR/h. Contract: B2B. Responsibilities. . Design, develop, and maintain backend systems using Java, Spring Boot, and AWS. . Build RESTful APIs, define and maintain OpenAPI specifications. . Package and deploy applications using Docker, manage deployments in AWS. . Develop and optimize data models using JPA/Hibernate and PostgreSQL. . Work with AWS services including IAM, Lambda, ECS, S3, AuroraDB, Cognito, API Gateway, ECR, CloudWatch. . Implement secure authentication/authorization using protocols such as OAuth2, OpenID Connect, JWT, SAML, and integrate with Azure AD. . Collaborate with Salesforce.com teams for API integration and auth flows. . Apply Domain-Driven Design (DDD) principles to model complex business domains. . Ensure best practices in code quality, security, and cloud architecture. . Contribute to Agile ceremonies, planning, code reviews, and architecture discussions. . . Technical Experience. . . 8+ years of hands-on experience with Java, JUnit, Spring Boot, JPA/Hibernate, SQL, PostgreSQL, REST, OpenAPI. . 8+ years of experience working with Amazon Web Services, especially IAM, VPC, Cognito, API Gateway, Lambda, ECS, S3, ECR, AuroraDB, CloudWatch, AWS CLI. . Strong experience with containerization and deploying applications using Docker in AWS environments. . Good knowledge of Domain-Driven Design (DDD). . Experience with authentication and authorization standards (AD, Azure AD, SAML, JWT, OAuth2, OpenID Connect). . Experience with Salesforce.com (authentication, APIs, authorization). . Familiarity with LLMs, AI agents, and Model Context Protocol (MCP). . Solid understanding of data structures and application security principles. . Experience with GitHub, GitHub Actions, JFrog Artifactory. . Experience in Agile environments, ideally Scrum or SAFe. . . Certifications. . . AWS Cloud Practitioner certification required. . AWS Solutions Architect certification preferred. . . Soft Skills. . . Strong communication skills and a proactive, team-oriented mindset. . Fluent English (spoken and written); additional language skills are a plus. . . Company Location: Poland.