Senior Back-End Developer (Java)

🚀AIMPROSOFT - Senior Back-End Developer (Java) Opportunity! 

Aimprosoft, a fast-growing IT company, is looking for a Senior Java Developer to join a long-term (6–12 months, with a strong likelihood of extension depending on project progress and business needs) international engagement focused on enterprise platform modernization and backend evolution in the Supply Chain / Logistics domain. 

The platform is a mission-critical enterprise system used by large global customers to support demand planning, inventory optimization, and supply chain decision-making. It operates at scale, with complex business logic, legacy components, and high reliability requirements. 

🎯About the project & role: 

You will join an experienced engineering environment where modernization is performed incrementally and carefully, without disrupting existing business workflows. 

The work focuses on: 

• Upgrading a legacy Java-based platform to newer Java versions (Java 8 → Java 17+) 
• Framework and dependency migrations (Spring, Hibernate, testing frameworks) 
• Modernizing backend architecture while preserving data models 
• Exposing APIs (GraphQL) on top of existing systems 
• Supporting and integrating with an ongoing 4GL migration 
• Collaborating closely with long-tenured architects who own the domain knowledge 

Your mission is to help safely modernize a large-scale enterprise backend, improve maintainability, and support long-term evolution of the platform. 

 
🔥What We Need From You: 

• 4+ years with Java 8+ 
• Experience upgrading or maintaining large legacy Java systems 
• English: Upper-Intermediate (B2) or higher for communication with international teams 
• Solid understanding of Spring Framework concepts, Hibernate / JPA fundamentals, Relational databases and SQL 
• Experience with Gradle 7.x / 8.x 
• Experience with Tomcat 10.x / 11.x 
• Practical experience designing or implementing GraphQL APIs 
• Experience with testing (JUnit concepts, mocking, isolation) 
• Strong debugging and troubleshooting skills 
• Ability to read and understand unfamiliar code 
• Comfortable working with incomplete documentation 
• Strong analytical mindset-ability to translate business needs into data-driven campaigns. 
• Ability to challenge AI outputs, validate results, and remain the final decision-maker 

📌Nice to have: 

• javax → jakarta migration experience 
• JUnit 4 → JUnit 5 migration experience 
• Experience with Spring Security 6.x 
• To be available from 5pm to 9pm Kyiv time (4–5 hours overlap with Central Time (CT)) 
• Experience in Supply Chain / Logistics domain project 
• Experience supporting or integrating with 4GL systems 
• Familiarity with gradual migration patterns 
• Bachelor’s or Master’s degree in Computer Science or related field. 

💼What We Offer: 

• Official military deferment (reservation) 
• A competitive salary that appreciates your skills and experience 
• Cozy atmosphere and modern approaches. We have neither bureaucracy nor strict management nor “working under pressure” conditions 
• Opportunity to implement your ideas, tools, and approaches. We are open to changes and suggestions aimed at improvement 
• Work on a strategic, large-scale international project with high visibility. 
• Remote-friendly culture with strong team collaboration.