We are looking for an experienced Senior Java Developer to design, implement, and maintain high-volume, low-latency applications for mission-critical systems. In this role, you will take ownership of the full development lifecycle - from writing efficient, testable code to driving architectural decisions. You will also act as a technical guide for the team, mentoring junior developers and fostering a culture of engineering excellence.

Work Model: Hybrid in Warsaw / Wroclaw / Krakow / Gdansk

Responsibilities:

Design, implement, and maintain high-volume, low-latency Java applications for mission-critical systems across the full development lifecycle.
Write high-quality, efficient, and testable code for critical components, ensuring strong functionality and performance.
Analyze and solve complex technical problems, including system failures, performance bottlenecks, and scalability challenges through root-cause analysis.
Provide technical leadership and mentorship to the engineering team, conducting rigorous code reviews and fostering a culture of software excellence.
Refactor and continuously improve the existing codebase to enhance maintainability and extensibility while actively addressing technical debt.
Ensure the overall quality and reliability of software products by driving a strong testing culture (unit, integration, and end-to-end tests).
Create and maintain technical documentation, including architecture diagrams and best-practice guides, to facilitate onboarding and knowledge sharing.

Minimum requirements:

Experience: Proven track record as a Senior Java Developer building enterprise-grade applications.
Core Tech: Deep expertise in Java and its ecosystem, particularly Spring Boot and Hibernate.
Database Mastery: Master-level knowledge of relational databases (PostgreSQL, MySQL, etc.).
Architecture & Design: Strong grasp of Object-Oriented Programming (OOP), design patterns, algorithms, data structures, and APIs (REST, RPC).
Testing: Master-level skills in unit testing (JUnit, Mockito) and a strong foundation in Test-Driven Development (TDD).
Infrastructure: Solid competence in working with Git and CI/CD pipelines.

Would be a plus:

Experience with Cloud technologies (AWS, GCP, or Azure).
Hands-on experience with Apache Kafka or other event-streaming platforms.

We offer:

Opportunity to work on bleeding-edge projects.
Work with a highly motivated and dedicated team.
Competitive salary.
Flexible schedule.
Benefits package - medical insurance, sports.
Corporate social events.
Professional development opportunities.
Well-equipped office.

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.

Senior Software Engineer (Java)

Grid Dynamics Poland