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.