Senior Java Backend Developer (Modernization & Database)

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