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.