Senior Fullstack Software Engineer (Backend-focused, Java/Spring Boot)

We are looking for Senior Fullstack Software Engineers (Backend-focused) to join FusionHit’s fast-paced, high-impact environment supporting. In this role, you will lead backend architecture and modernization initiatives for enterprise retail and supply chain systems built on Java/Spring Boot, driving design decisions and elevating engineering standards across teams, while remaining comfortable working across the stack. You will play a key role in transforming legacy platforms into scalable, maintainable, and performance-driven services while collaborating closely with frontend engineers (working across multiple JS frameworks), DevOps, and product stakeholders. This project focuses on modernizing enterprise-level retail systems that directly support business-critical store and supply chain operations. Location: Remote – Latin America (must reside and have work authorization in LatAm) Availability: Significant overlap with Mountain Standard Time (MST) Requirements - BS/MS in Computer Science, Software Engineering, or related field. - 6+ years of experience in Backend/Fullstack Engineering. - 5+ years of hands-on experience with Java and Spring Boot building enterprise-grade REST APIs and microservices. - Strong experience with Postgres-backed data layers and API design for high-traffic retail systems. - Working knowledge of modern JS/TS frontend frameworks (React, Next.js, Angular, or Vue), sufficient to integrate and troubleshoot end-to-end across our multi-framework frontend stack. - Strong understanding of phased modernization strategies over legacy backend systems. - Deep experience with automated testing for backend services (unit, integration, contract) and Playwright/Jest awareness for E2E coordination. - Experience managing CI/CD pipelines in GitLab. - Experience implementing monitoring and observability strategies using Datadog. - Retail, store operations, or supply chain system experience (strong plus). - Comfortable engaging with stakeholders and incorporating real-world user feedback. - Excellent communication skills in English (C1 preferred, strong B2 may be considered). Key Responsibilities - Lead backend architecture decisions and modernization strategy for Java/Spring Boot services. - Design scalable, secure REST APIs and microservices on Postgres-backed data stores. - Drive best practices in code quality, testing, and CI/CD automation. - Collaborate cross-functionally with frontend, DevOps, and product teams across multiple JS framework stacks. - Mentor mid-level engineers and promote engineering excellence. - Ensure performance optimization and monitoring using Datadog. - Lead phased migration from legacy backend systems to modern service architecture. - Incorporate stakeholder feedback and real-world retail workflows into system design. Benefits - Certified as a Great Place to Work, offering a supportive and inclusive work culture. - Work from home position. - Personal and Professional Development Courses & Certifications. - Flexible Schedule. - 3 Sick Days per year. - Birthday Off. - Extra Days for Special Occasions. - Team Building Meal Reimbursement. - Equipment Granted. - Monthly Recognitions. - High Impact Committees.