Senior Java Developer
New
Locations: Warszawa, Zygmunta Vogla 28, Warszawa, Country code: PLFull-TimeSenior
Salary18,000 - 21,000 PLN per month
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Job Details
- Languages
- English (B2), Russian (C1)
- Experience
- 5+ years
- Required Skills
- AWSApache TomcatGitJavaJavascriptMySQLSpring MVCREST API
Requirements
- 5+ years of commercial Java development experience
- Strong knowledge of core Java, multithreading, collections, concurrency
- Strong understanding of full web application architecture, including Java backend and JavaScript-based frontend
- Experience with large legacy systems and refactoring
- Strong SQL skills and experience with MySQL or similar relational databases
- Experience building and supporting REST APIs
- Experience with application performance tuning and troubleshooting
- Familiarity with Linux production environments
Responsibilities
- Develop and maintain backend functionality for web and mobile applications
- Work with a large legacy Java codebase and participate in gradual refactoring
- Design and implement new REST APIs for mobile clients
- Migrate legacy modules to modern Java stack
- Integrate AI-powered services into existing products and internal workflows
- Build backend services interacting with LLM APIs and AI-based data processing pipelines
- Optimize performance of backend services and database interactions
- Participate in architectural decisions for modernization of the monolith
- Investigate production issues and improve system reliability
- Work with cloud infrastructure and distributed caching solutions
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