Open to opportunities

Juan Espares

@juanespares

Message

Backend software engineer at Contal Services who cut API calls by 75% and delivered a Care Management application.

Australia

Message

At Contal Services, I re-architected a government API integration, cutting API call volume by up to 75% and monthly operational costs by 66%. I also engineered credential encryption for government APIs and designed a delta sync API.

I delivered an end-to-end Care Management application with a React frontend and Java/Spring Boot backend, automating manual data entry. I also integrated Jetstar Airlines into a multi-airline booking platform, including bundle fares and Special Service Request flows.

Earlier, at Dye & Durham, I migrated a legacy integration layer from SOAP to REST and integrated Keycloak SSO with OAuth 2.0. At Scriptsoft, I developed a Power BI solution for pharmacy inventory management; my pharmacy and health-sciences studies also inform my work in healthcare.

Experience

Work history, roles, and key accomplishments

Current

Software Engineer – Backend

Current

Contal Services

Nov 2024 - Present (1 year 11 months)

Re-architected a government API integration, cutting API call volume by up to 75% and operational costs by 66%. Delivered end-to-end applications and integrations for airline booking and care management.

Java Spring Boot Hibernate React NodeJS REST APIs RabbitMQ AWS Docker Kubernetes OAuth Keycloak PostgreSQL MySQL Informix GitHub Actions Junit Mockito

Junior Software Engineer

Dye & Durham

May 2023 - Oct 2024 (1 year 5 months)

Migrated legacy SOAP integration layer to REST, protecting $1.5M annual revenue. Integrated Keycloak SSO with OAuth 2.0 for enterprise application modernisation.

Java REST APIs SOAP Keycloak OAuth Sequence Diagrams Legacy Systems

Software Developer

Scriptsoft

Sep 2022 - May 2023 (8 months)

Developed custom Power BI solution for pharmacy inventory management. Maintained and improved internal software systems, managing full development and deployment lifecycle.

Power BI Software Development Deployment Bug Resolution

Education

Degrees, certifications, and relevant coursework

AWS

AWS Solutions Architect Associate, Cloud Architecture

2025 - 2028

AWS Solutions Architect Associate certification.

The University of Queensland

Bachelor of Computer Science, Computer Science

Bachelor of Computer Science degree.

The University of Queensland

Bachelor of Pharmaceutics and Therapeutic Science, Pharmaceutics and Therapeutic Science

Bachelor of Pharmaceutics and Therapeutic Science degree. Three years of pharmacy and health-sciences study, providing healthcare domain knowledge applied directly in aged care and CHSP work.