Senior Java Backend Developer (Modernization & Oracle)

About the Project

We are looking for a Senior Java Backend Developer to join a new team tasked with stabilizing and transforming 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 a support of service team

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

• Optimize Oracle 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.

• Strong experience working on brownfield projects

• Strong understanding of software architecture principles and system design.

• Solid experience with Oracle databases, including query tuning and performance optimization.

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

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

• Skills in refactoring

• 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.

• 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.