Senior Java Engineer (Fintech)

TL;DR

Senior Java Engineer (Fintech): Leading the test-driven migration of a legacy Java EE application to a modern Spring Boot architecture with an accent on transformation from MySQL to MongoDB. Focus on designing clean, testable Spring Boot services and data access interfaces, ensuring performance parity with the legacy application.

Location: Remote (Poland)

Company

hirify.global is a custom product engineering company that supports both multinational organizations and scaling startups to solve their most complex business challenges.

What you will do

• Analyze existing Java EE components and document business logic.
• Design clean, testable Spring Boot services and data access interfaces.
• Plan and execute MySQL to MongoDB data model transformation.
• Write unit/integration tests prior to implementation.
• Execute incremental migration with parallel validation.
• Ensure performance parity with legacy application.

Requirements

• Strong experience building enterprise applications, REST APIs, and data access layers with Java/Spring Boot and Spring Data.
• Ability to analyze and deconstruct legacy Java EE components (EJBs, JPA, CDI).
• Deep understanding of relational data models and query optimization with MySQL.
• Experience with NoSQL patterns, document modeling, and Spring Data, MongoDB.
• Proven track record writing comprehensive test suites before implementation (JUnit, Mockito, Testcontainers).
• Experience leveraging AI for code analysis, conversion assistance, and documentation generation with LLM/AI Tools.

Culture & Benefits

• Work alongside top professionals in a friendly, open-door environment.
• Take on large-scale projects with a global impact and expand your expertise.
• Boost your skills with internal events, Udemy access, language courses, and company-paid certifications.
• Explore diverse domains through internal mobility, finding the best fit to gain hands-on experience with cutting-edge technologies.
• Enjoy flexibility with full remote working possibilities.
• Company-paid medical insurance, mental health support, and financial & legal consultations.