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September 25, 2026
Senior Java Developer (AI/NLP Solutions)
Senior • On-site
Kraków, Pl-06, Poland
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Quick Facts
Role: Senior Java Developer (AI/NLP Solutions)
Description
Design, develop, and maintain scalable enterprise applications that integrate machine learning, NLP, and Large Language Models. You’ll build reliable and secure backend services in an agile team, applying best practices for testing, validation, observability, and operational support. You will also help translate business requirements into sustainable technical solutions and guide AI integration architecture.
Responsibilities
Analyze, design, develop, test, and maintain complex enterprise software using Java and related technologies
Build scalable backend services and help evolve core application frameworks
Integrate machine learning models, Large Language Models, and AI services into enterprise applications
Collaborate with Product Managers, Business Analysts, architects, and engineers to turn business requirements into technical solutions
Contribute to architecture decisions for AI integration, data flows, validation, security, observability, and operational support
Apply best practices for AI-enabled functionality (automated testing, output validation, performance monitoring, auditability, human oversight)
Provide technical guidance in design discussions and code reviews
Troubleshoot complex issues in mission-critical client environments
Mentor junior engineers and improve engineering practices
Requirements
5+ years of experience across the full software development lifecycle for enterprise Java applications
Strong knowledge of core Java, Spring Boot, REST APIs, microservices, relational databases, and distributed systems (e.g., Kafka)
Good understanding of ML and NLP fundamentals: classification, model evaluation, tokenization, embeddings, semantic similarity, information extraction
Good understanding of LLM and Transformer fundamentals: prompting, context handling, structured outputs, retrieval-augmented generation, model limitations, integration into backend applications
Strong problem-solving and communication skills for cross-team collaboration
Benefits
Permanent contract from day one
Additional holidays (Birthday Day Off, 3rd and 5th year anniversary Day Off)
Gold Medical Package for employees and their families
Premium life insurance package and private pension plan
Soft skills training, technical workshops, language classes, and development programs
Volunteer opportunities for company-driven initiatives and employee networks
Well-being programs
Additional benefits depending on seniority
Discretionary annual performance-based awards
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