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Lucas User

@lucasuser20

Senior Java Full-Stack Developer at HRAcuity building scalable web applications with Spring Boot, ReactJS, and REST APIs.

United States

Message

At HRAcuity, I design and build scalable web applications with Java, Spring Boot, ReactJS, and REST APIs. I develop backend services and responsive interfaces, and optimize data models and queries for performance.

Previously, I built applications and services at Quick Organics and TAK-Progressive Health Services Inc, and delivered more than 20 production applications through Upwork. My work has included automated testing, CI/CD workflows, and production support.

Experience

Work history, roles, and key accomplishments

Current

Senior Full Stack Engineer

Current

HRAcuity

Mar 2023 - Present (3 years 7 months)

Design and build scalable web applications using Java, Spring Boot, ReactJS/TypeScript, REST APIs, microservices, and SQL/NoSQL databases. Develop Spring Boot backend services with validation, authentication/RBAC, asynchronous processing, integrations, caching, resilient error handling, and maintainable service boundaries.

Java Spring Boot React TypeScript REST APIs Microservices SQL NoSQL PostgreSQL MySQL MongoDB HTML CSS Git CI CD Unit Testing Integration Testing E2E Testing Debugging Production Support Code Review Agile Scrum

Software Engineer

Quick Organics

Feb 2021 - Mar 2023 (2 years 1 month)

Built high-scale applications using Java, Spring Boot, ReactJS/TypeScript, REST/GraphQL APIs, microservices, SQL/NoSQL databases, and cloud infrastructure. Designed Spring Boot services for transactions, search, analytics, notifications, integrations, and asynchronous/event-driven workflows.

Java Spring Boot React TypeScript REST APIs GraphQL Microservices SQL NoSQL Cloud Infrastructure Git CI CD Observability Performance Optimization Debugging Production Troubleshooting Code Review Agile Scrum

Software Engineer

TAK-Progressive Health Services Inc

Dec 2017 - Jan 2021 (3 years 1 month)

Developed enterprise applications using Java, Spring Boot, ReactJS/TypeScript, REST APIs, microservices, SQL/NoSQL databases, and cloud infrastructure. Built Spring Boot backend services with authentication/RBAC, validation, asynchronous processing, external integrations, audit logging, caching, and resilient error handling.

Java Spring Boot React TypeScript REST APIs Microservices SQL NoSQL Cloud Infrastructure Git CI CD Monitoring Logging Debugging Production Support Security Code Review Agile

Full Stack Engineer

Upwork

Jan 2015 - Nov 2017 (2 years 10 months)

Delivered more than 20 production applications using Java/Spring Boot-style services, ReactJS/JavaScript, REST APIs, microservices, and SQL/NoSQL databases. Developed backend services and APIs with object-oriented design, validation, authentication, background processing, third-party integrations, caching, and error handling.