Senior Java Engineer

<div class="content-intro"><p><span style="font-size: 10pt; font-family: helvetica, arial, sans-serif;">Arionkoder is an AI consulting firm helping companies build, embed, and own AI systems that drive real business outcomes. We combine Product Development, Artificial Intelligence, and Team Augmentation to craft digital products and solutions that create lasting impact — guided by a human-centric approach and a commitment to pushing the boundaries of what technology can do.</span></p></div><p> </p> <h3 class="text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold"><span style="font-size: 10pt; font-family: tahoma, arial, helvetica, sans-serif;">About the Role</span></h3> <p class="font-claude-response-body break-words whitespace-normal"><span style="font-size: 10pt; font-family: tahoma, arial, helvetica, sans-serif;">We are looking for a Senior Backend Engineer to join a team that maintains and evolves mission-critical integration services. The stack is Java + Spring Boot, with REST integrations to third-party APIs, with a focus on both new features and the quality and maintainability of the system in production.</span></p> <h3 class="text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold"><span style="font-size: 10pt; font-family: tahoma, arial, helvetica, sans-serif;">Responsibilities</span></h3> <ul class="[li_&]:mb-0 [li_&]:mt-1 [li_&]:gap-1 [&:not(:last-child)_ul]:pb-1 [&:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3"> <li class="font-claude-response-body whitespace-normal break-words pl-2" style="font-size: 10pt; font-family: tahoma, arial, helvetica, sans-serif;"><span style="font-size: 10pt; font-family: tahoma, arial, helvetica, sans-serif;">Design, develop, and maintain backend services in Java (17) / Spring Boot.</span></li> <li class="font-claude-response-body whitespace-normal break-words pl-2" style="font-size: 10pt; font-family: tahoma, arial, helvetica, sans-serif;"><span style="font-size: 10pt; font-family: tahoma, arial, helvetica, sans-serif;">Build and maintain integrations with third-party REST APIs, including model mapping, contract versioning, and deserialization.</span></li> <li class="font-claude-response-body whitespace-normal break-words pl-2" style="font-size: 10pt; font-family: tahoma, arial, helvetica, sans-serif;"><span style="font-size: 10pt; font-family: tahoma, arial, helvetica, sans-serif;">Write unit and integration tests and maintain solid test coverage.</span></li> <li class="font-claude-response-body whitespace-normal break-words pl-2" style="font-size: 10pt; font-family: tahoma, arial, helvetica, sans-serif;"><span style="font-size: 10pt; font-family: tahoma, arial, helvetica, sans-serif;">Work on error handling, structured logging, and observability.</span></li> <li class="font-claude-response-body whitespace-normal break-words pl-2" style="font-size: 10pt; font-family: tahoma, arial, helvetica, sans-serif;"><span style="font-size: 10pt; font-family: tahoma, arial, helvetica, sans-serif;">Participate in code reviews and propose architecture and quality improvements.</span></li> </ul> <h3 class="text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold"><span style="font-size: 10pt; font-family: tahoma, arial, helvetica, sans-serif;">Requirements</span></h3> <ul class="[li_&]:mb-0 [li_&]:mt-1 [li_&]:gap-1 [&:not(:last-child)_ul]:pb-1 [&:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3"> <li class="font-claude-response-body whitespace-normal break-words pl-2" style="font-size: 10pt; font-family: tahoma, arial, helvetica, sans-serif;"><span style="font-size: 10pt; font-family: tahoma, arial, helvetica, sans-serif;">5+ years of experien