Senior Java Developer

On behalf of our Client from the US, Mobilunity is looking for a Java Developer.

In this role, you will work on mission-critical backend services, integrations, product catalog management, inventory synchronization, order processing, and marketplace integrations that support a rapidly growing online retail business.

We are looking for a highly experienced engineer who thrives in a fast-paced, startup-like environment, takes ownership of solutions, and is comfortable working independently with minimal supervision. This role requires strong technical expertise, excellent communication skills, and the ability to collaborate directly with both technical and business stakeholders.

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

Requirements:

7+ years of professional Java development experience.

Strong knowledge of Java SE and object-oriented programming principles.

Solid experience with Spring Framework (Core, MVC, Spring Boot).

Experience with Hibernate/JPA.

Strong understanding of RESTful API design and development.

Experience working with SOAP web services.

Strong SQL skills and experience with MySQL or other relational databases.

Experience with Git and modern software development workflows.

Strong understanding of software architecture principles and design patterns.

Experience working in Agile/Scrum environments.

Excellent analytical and problem-solving skills.

Advanced English communication skills (written and verbal).

Responsibilities:

Design, develop, and maintain scalable backend applications and services using Java and Spring technologies.

Build and enhance integrations with internal systems, third-party platforms, marketplaces, and external partners.

Develop and maintain APIs and web services (REST and SOAP).

Support product catalog management, inventory synchronization, and order processing workflows.

Participate in architectural discussions and contribute to technical decision-making.

Troubleshoot and resolve production issues in a timely manner.

Collaborate directly with internal and external stakeholders to understand requirements and deliver effective solutions.

Contribute to continuous improvements in code quality, development processes, and platform reliability.

Participate in Agile ceremonies and work closely with cross-functional teams.

Nice to have:

Experience with SAP Commerce (Hybris) and B2B/B2C e-commerce platforms.

Experience with AWS, Docker, CI/CD pipelines, and GraphQL.

Experience with marketplace integrations, event-driven architectures, or third-party service integrations.

Experience supporting high-availability and high-traffic systems.

Background in automotive, retail, or e-commerce industries.

Previous technical leadership or mentoring experience.

Experience working with US-based companies or distributed international teams.

In return 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

Come on board, and let’s grow together!