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

FusionHit; Comisión de Fomento de Perú; Remote; ARS 136,828,000 - 182,437,000; Full time

Benefits offered by this job

Great Place to Work

Work from home

Professional development

Flexible schedule

Sick days

Job summary

FusionHit is seeking a Senior Fullstack Software Engineer (Backend-focused) to lead backend architecture and modernization for Java/Spring Boot services in a remote LATAM role. You’ll drive API design, microservices, and PostgreSQL data layers while coordinating with frontend, DevOps, and product teams.

The ideal candidate has 6+ years in backend/fullstack engineering, strong Java/Spring Boot experience, and familiarity with CI/CD, testing, and observability using Datadog.

Qualifications

• BS/MS in Computer Science, Software Engineering, or related field.
• 6+ years of Backend/Fullstack Engineering experience.
• 5+ years with Java and Spring Boot building REST APIs and microservices.
• Strong Postgres data layer experience and API design for high traffic retail systems.
• Working knowledge of modern JS/TS frontend frameworks to troubleshoot across the stack.
• Experience modernizing legacy backends with phased strategies.
• Automated testing for backend services and E2E awareness with Playwright/Jest.
• Experience managing CI/CD pipelines in GitLab and monitoring with Datadog.
• Retail/store operations or supply chain systems experience is a plus.
• Excellent English communication; MST overlap for availability.

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 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.

Skills

Java

Spring Boot

REST APIs

PostgreSQL

Frontend basics

CI/CD (GitLab)

Observability (Datadog)

English communication

Education

BS/MS in Computer Science or related field

Tools

GitLab CI/CD

Datadog

Job description

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

Empresa : Fusionhit

Tipo de empleo : Tiempo completo

Remote / Work from Home

Descripción del trabajo - 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.