Senior Middleware Engineer (Java)

Akvelon is looking for a Senior Middleware Engineer to join an existing team on the project — a flexible Terminal Operating System (TOS) platform for marine terminal operators that helps optimize and scale port operations. The system is multi-language, highly configurable per site, and supports workflows handling ~12% of all global freight moves.
 

Responsibilities:

• Develop and maintain middleware/backend services and integrations for a large-scale enterprise platform
   
• Design and optimize services with a strong focus on performance, reliability, and scalability
   
• Work with Java 11/17 + Spring/Spring Boot, ensuring clean architecture and maintainable code
   
• Perform memory management and performance tuning for high-load components
   
• Write and maintain unit tests, contribute to overall quality and engineering standards
   
• Collaborate with product/engineering stakeholders and communicate progress clearly
   
• Occasionally support React-based UI parts when needed (integration points, minor UI tasks)
   

Requirements:

• Senior-level experience in backend/middleware engineering
   
• Deep expertise in Java (11/17) + Spring/Spring Boot
   
• Strong understanding of JVM memory management, profiling, and performance tuning
   
• Solid unit testing practices and hands-on experience with test frameworks
   
• Upper-Intermediate English or higher with strong communication skills
   
• Ability to travel abroad (business trips to customer sites such as terminals/ports may be required)
   

Nice to have:

• Experience with React (working level)
   
• Background in logistics, transportation, ports, or other operationally critical enterprise systems
   

What we offer:

• Long-term cooperation with a stable, existing Akvelon client
   
• Opportunity to work on a globally impactful product in the marine logistics domain
   
• Professional growth, strong engineering culture, and collaboration with experienced teams
   
• B2B contract, competitive compensation
   
• Paid vacation and sick leave
   
• Flexible schedule and remote work format (subject to travel needs)
  
   

If this role sounds like a match, apply now and send us your CV.

Please also share your current location, English level, and travel availability — we’ll get back to you to discuss the next steps.