Principal Senior Full Stack Engineer Java React

Svitla Systems Inc. is looking for a Principal / Senior Full Stack Engineer (Java/React) for a full-time position (40 hours per week) in Poland. Our client is a digital marketing company that offers email marketing, social media marketing, event marketing, and online survey tools to assist organizations in expanding their businesses by fostering stronger customer relationships.

Overlap till 20:00 CET.

Requirements:

• 8+ years of experience in developing large-scale applications.

• Proven experience as a Java Back End Developer with successful project implementations.

• Strong understanding of Java programming and server-side frameworks (e.g., Spring, Spring Boot).

• Experience in frontend development with HTML, CSS, and JavaScript (React preferred) to create and maintain essential UI components and support end-to-end functionality.

• Solid experience with AI coding tools like Clause, Cursor, GenAI (LLMs, RAGs, AI agents) is a huge plus.

• In-depth understanding of the software development life cycle (SDLC) and agile methodologies.

• Knowledge of AWS cloud, specifically with Lambdas.

• Experience in integration of the 3-rd party APIs.

• Experience in working with legacy codebases and refactoring.

• Expertise in designing, developing, testing, and maintaining scalable backend applications.

• Knowledge of build tools (e.g., Maven, Gradle) and CI/CD pipelines (e.g., Jenkins, GitLab CI).

• Experience with unit testing (e.g., JUnit) and integration testing.

• Familiarity with database design, optimization, and query tuning for both relational (e.g., MySQL, PostgreSQL) and non-relational databases (e.g., MongoDB).

• Expertise in designing and implementing RESTful APIs and API standards (e.g., OpenAPI)