Senior Java Developer
Fully Remote from Portugal
We are seeking a Senior Java Developer to join our high-impact engineering team responsible for building backend services that power our advertising platform. This role is critical to delivering scalable, secure, and performant solutions for advertiser onboarding, campaign management, reporting, and billing.
As a senior engineer, you'll contribute to core service development, participate in architectural decisions, and help ensure our systems meet high availability and performance demands at scale.
Essential functions
Contribute to the full software development lifecycle: design, build, test, deploy, support
Develop robust APIs and backend services using Java and Spring Boot 5/6
Handle production support, including troubleshooting, incident triage, and root cause analysis
Implement secure and efficient session management strategies to support authentication and user flows
Partner with internal teams to optimize system performance and improve developer experience
Implement clean, scalable designs aligned with architectural best practices
Participate in code reviews, drive engineering standards, and mentor
Qualifications
6+ years of hands-on experience in Java development
Strong programming expertise in Java (JDK 17+; ideally 21)
Hands-on experience with Spring Boot 5 and 6
Experience building RESTful APIs and backend orchestration layers
Experience with OAuth2, JWT handling with Spring Security
Strong systems thinking and architectural design skills
Understanding of multithreading, concurrency, and memory management
Familiar with unit testing frameworks like TestNg, JUnit, Mockito
Strong experience with Log4j2, SLF4J, with awareness of log injection and Log4j vulnerabilities.
Would be a plus
Experience with Redis caching
Familiarity with Splunk and/or Datadog for monitoring and log analysis
Exposure to frontend technologies (JavaScript, Node.js, GraphQL)
CI/CD experience (Rio, Jenkins, GitHub etc.)
Comfortable working with containerized environments (Docker, Kubernetes)
Experience in high-throughput, low-latency systems
We offer
Opportunity to work on bleeding-edge projects
Work with a highly motivated and dedicated team
Competitive salary
Flexible schedule
Professional development opportunities
About us
Grid Dynamics (NASDAQ: GDYN) is a leading provider of technology consulting, platform and product engineering, AI, and advanced analytics services. Fusing technical vision with business acumen, we solve the most pressing technical challenges and enable positive business outcomes for enterprise companies undergoing business transformation. A key differentiator for Grid Dynamics is our 8 years of experience and leadership in enterprise AI, supported by profound expertise and ongoing investment in data, analytics, cloud & DevOps, application modernization and customer experience. Founded in 2006, Grid Dynamics is headquartered in Silicon Valley with offices across the Americas, Europe, and India.Apply to the position
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Grid Dynamics is an equal opportunity employer. We are committed to creating an inclusive environment for all employees during their employment and for all candidates during the application process.
All qualified applicants will receive consideration for employment without regard to, and will not be discriminated against based on, age, race, gender, color, religion, national origin, sexual orientation, gender identity, veteran status, disability or any other protected category. All employment is decided on the basis of qualifications, merit, and business need.