Software Engineer Spring Boot

Guerby Mertil

Email: **************@*****.*** Mobile Number:350-***-**** Location : Miami, FL, US

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PROFILE

Full Stack Engineer with 12+ years of experience in web and enterprise development. Strong expertise in Java (Spring Boot) and Python (Django/DRF) for backend development, with complementary skills in React and TypeScript for frontend. Experienced in SQL/NoSQL databases, microservices, cloud-native deployments, and agile collaboration. SKILLS

Java Skills

Java SE 8–21, Multithreading, Concurrency, Reactive Programming, Java Memory Model, JVM Tuning

Python Skills

Frontend

Databases

MySQL, PostgreSQL, MongoDB, Redis

Architecture & Integration

EDUCATION

Frameworks & Libraries

Spring Boot, Spring MVC, Spring Security, Spring Data JPA, Hibernate ORM, Spring Cloud, Mockito, Junit

Cloud & Monitoring

AWS(EC2, S3, ECS, RDS, CloudWatch, CloudTrail), Azure DevOps, Datadog

DevOps & CI/CD

Docker, Kubernetes, Jenkins, Git, JIRA, Maven

Bachelor of Computer Science

West Virginia State University

09/2000 – 05/2005 Institute, WV

Florida International Communication

PROFESSIONAL EXPERIENCE

09/2002 – 06/2004 Miami, FL

Senior Java FullStack Engineer 09/2023 – Present San Diego, California GB MAGAZINE

Led backend development for BilingualCMS, a multilingual SaaS content platform enabling editorial teams to publish articles in English and Spanish, using Java 21, Spring Boot, Spring MVC, Spring Data JPA, Hibernate ORM, and JPA Criteria API.

- A• pplied unit and integration testing using JUnit 5, Mockito, and Testcontainers for backend and Jest, React Testing Library for frontend.

- E• nhanced performance by tuning JVM parameters, optimizing Garbage Collection, and implementing asynchronous processing with CompletableFuture and Spring @Async.

- L• everaged Spring Actuator, Micrometer, and Prometheus/Grafana metrics for monitoring and observability. C• reated a React/TypeScript-based administrative dashboard, integrating backend APIs to improve audience engagement and staff efficiency.

- I• ntegrated social media APIs (Facebook, Twitter, Instagram) and implemented webhooks for event-driven updates. Python 3.x, Django, Flask, Django REST Framework, Celery

:https://www.github.com/FrozenIce0617 : https://www.linkedin.com/in/guerby-mertil-24742914 React.js, TypeScript, Next.js,

Microservices, RESTful APIs, GraphQL

- Built React/TypeScript dashboards consuming both REST and GraphQL endpoints to streamline editorial workflows. Experienced in building scalable REST and GraphQL APIs for enterprise and SaaS applications.

- D• eveloped CI/CD pipelines with Jenkins, GitHub Actions, and Terraform, deploying to AWS (EC2, S3, Lambda) using Docker and Kubernetes.

- B• uilt EventSnap, an AI-powered event photo automation tool that reduced manual photo curation using AWS Lambda.

- Designed and exposed REST APIs using Python Django REST Framework for third-party editorial integrations.

- Implemented Celery with Redis for background jobs (notifications, scheduled publishing). Deployed hybrid services (Spring Boot + Django) on AWS ECS with REST interoperability Java FullStack Engineer 04/2020 – 04/2023 Boca Raton, Florida Atlantic International Capital Digital Asset Group LLC

- D• eveloped CryptoConnect, a platform enabling the management of digital asset sponsorships and transactions in the financial services sector, with backend services in Spring Boot, Spring Data JPA, Hibernate ORM.

- I• ntegrated blockchain payment gateways (Ethereum, Coinbase Commerce APIs) with React-based interfaces for crypto transactions in a financial services context.

- B• uilt real-time dashboard using React.js + TypeScript, implementing Hooks, Redux Toolkit, and Context API for state and effect management.

- O• ptimized backend performance with Redis caching, connection pooling (HikariCP), and Spring Batch for bulk operations.

- U• tilized MongoDB and Redis for managing semi-structured data and improving application performance with efficient caching strategies.

- A• utomated deployment of containerized services using Kubernetes, Docker, ensuring reliable and scalable production environments.

- Monitored system health using Datadog, OpenTelemetry, and AWS CloudWatch, implementing distributed tracing for performance tuning.

- Automated reporting pipelines with Django + Celery to speed up transaction log processing.

- Built Python Django microservices for blockchain analytics and reporting, integrated with Java engine. Software Engineer 06/2015 – 03/2020 Miami Beach, FL DECOBIKE

- Migrated legacy monoliths to Spring Boot microservices, implementing Spring MVC, Spring Security, RESTful APIs, and JWT/session-based authentication.

- D• esigned and normalized MSSQL schema, wrote complex JPQL, HQL, and native SQL queries, and ensured transactional integrity with Spring Transaction Management.

- I• mplemented CRUD operations using Hibernate ORM to manage bike rental data, optimizing booking, maintenance, and user management processes for the DECOBIKE system.

- D• eveloped responsive, user-friendly interfaces using TypeScript, React, leveraging UI libraries to build interactive front-end components and enhance user experience across devices.

- Monitored system performance through Datadog to ensure service reliability. Software Developer 03/2012 – 01/2015 Chicago, IL BikeForLife

- D• eveloped backend services using Java and Spring MVC to manage bike inventory, user registrations, rental bookings, and maintenance records.

- B• uilt frontend interfaces using Angular to allow users to view available bikes, register for programs, and track rentals.

- I• mplemented unit testing with JUnit and Mockito, ensuring robust service and DAO layers with high coverage. E• nsured code quality through unit testing, code reviews, and documentation, maintaining a reliable and maintainable system. Developed secure Django REST APIs for wallet management and dashboards consumed by React.js frontend.

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- Designed and exposed REST and GraphQL APIs using Python Django REST Framework for third-party editorial integrations.

- Developed backend services exposing GraphQL endpoints for real-time crypto transaction dashboards consumed by React frontends.

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