Java Technical Lead (System Design)

About the Position

On behalf of our client from the US, Mobilunity is looking for a Java Technical Lead (System Design).

You will work on mission-critical backend systems powering a large-scale US e-commerce platform. The role involves designing and developing backend services, integrations, inventory synchronization, order processing, pricing logic, and marketplace integrations supporting a high-traffic online business.

This is not a typical feature-delivery role. You’ll participate in architectural discussions, solve complex engineering problems, and collaborate directly with technical and business stakeholders to deliver scalable solutions.

Candidates must be available to work primarily during US business hours, with a preferred schedule of 1:00 PM – 8:00 PM CET.

Responsibilities

• Design, develop and maintain scalable backend services using Java and Spring.
• Build integrations with internal services, marketplaces, and external partners.
• Develop REST and SOAP APIs.
• Work on inventory synchronization, pricing, catalog management, and order processing.
• Participate in architecture discussions and technical decision-making.
• Troubleshoot production issues.
• Collaborate directly with engineering and business stakeholders.
• Improve system scalability, reliability, and performance.
• Contribute to engineering standards and development best practices.

Requirements

• 7+ years of commercial Java experience.
• Strong Java SE and OOP knowledge.
• Spring Boot, Spring Framework.
• Hibernate/JPA.
• REST APIs.
• SOAP.
• SQL (MySQL or similar).
• Software architecture principles.
• Experience designing scalable backend systems.
• Strong analytical and problem-solving skills.
• Advanced English.

Nice to Have

• SAP Commerce (Hybris)
• AWS
• Docker
• Kafka
• CI/CD
• GraphQL
• Marketplace integrations
• Event-driven architecture
• High-load systems
• Automotive / Retail / E-commerce
• AI-assisted development
• Experience working with US companies

We Offer

• The friendliest community of like-minded IT-people
• Open knowledge-sharing environment – exclusive access to a rich pool of colleagues willing to share their endless insights into the broadest variety of modern technologies
• Mobilunity Medical Insurance program designed to attend our teams’ needs
• Paid vacations and sick leaves, including 5 paid days per year that don’t require a sick note
• Perfect office location in the city-center (900m from Lukyanivska metro station with a green and spacious neighborhood) or remote mode engagement: you can choose a convenient one for you, with a possibility to fit together both
• No open-spaces setup – separate rooms for every team’s comfort and multiple lounge and gaming zones
• English classes in 1-to-1 & group modes with elements of gamification
• Neverending fun: sports events, tournaments, music band, multiple affinity groups

About the Company

Come on board, and let’s grow together!

Apply for This Position

We will contact you as soon as possible.