Senior Java Backend Developer Modernization

4 tygodni temu

Kraków, małopolskie, Polska Ready4S Pełny etat 30 zł

About the Project

We are looking for a Senior Java Backend Developer to join a team tasked with stabilizing and transforming a business-critical application. The current system is fragile and has many issues, so your role will involve reverse engineering, gaining a deep understanding of both the codebase and business processes, and driving modernization.

This is a brownfield project – success requires strong technical expertise, architectural thinking, and the ability to navigate ambiguity while making the system robust and future-proof. Over time, you will help rethink the architecture, improve performance, refactor existing code, and define a sustainable technical foundation.


Responsibilities

  • Analyze and stabilize a fragile application with the support of a service team

  • Reverse engineer existing components and business logic to gain a deep understanding of the system

  • Optimize database queries, data access, and memory management for performance and scalability

  • Identify and implement code refactoring opportunities to improve maintainability

  • Rethink system architecture and recommend appropriate tools, frameworks, and approaches

  • Collaborate with business stakeholders to ensure technical solutions align with business needs

  • Work closely with the team to establish engineering best practices and architectural principles


Requirements

  • 5+ years of experience in Java backend development

  • Experience working on brownfield projects

  • Solid understanding of software architecture principles and system design

  • Proven ability in reverse engineering, debugging, and stabilizing fragile systems

  • Experience with databases, memory management, and large-scale data handling

  • Skills in refactoring and improving code quality

  • Ability to quickly learn and understand complex business processes

  • Excellent communication skills and openness to working with international teams (US, India, PL)


Nice to Have

  • Experience with performance-critical enterprise applications

  • Query tuning and performance optimization

  • Knowledge of domain-driven design or other structured architectural approaches

  • Familiarity with modernization strategies and enterprise integration tools


Why Join This Project?

  • Work on a high-impact application that is critical to business operations

  • Opportunity to shape and modernize the architecture, not just maintain it

  • Long-term potential with a multi-year modernization roadmap

  • Collaborative international environment with challenging, meaningful problems to solve

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