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Jose R.

Fullstack developer Kotlin-Java / Spring / Angular

Can work in or around Barcelona

  • 41.3829
  • 2.17743
  • Suggested rate €350 / day
  • Experience 2-7 years
  • Response rate 100%
  • Response time 12 hours
Propose a project The project will begin once you accept Jose's quote.

This freelancer is available part-time (Evenings & weekends) but hasn't confirmed their availability in over 7 days.

Part-time, Evenings & weekends

Propose a project The project will begin once you accept Jose's quote.

Location and workplace preferences

Location
Barcelona, España
Can work onsite in your office in
  • around Barcelona and 50km

Preferences

Project length
  • Between 1-3 months
  • Between 3-6 months
  • ≥ 6 months
Business sector
  • Automobile
  • Civil Engineering
  • Retail (Small Business)
  • E-commerce
  • Tech
+3 other

Verifications

Freelancer code of conduct signed
Read the Malt code of conduct

Verified email

Languages

  • Spanish

    Native or bilingual

  • English

    Fluent

  • Catalan

    Native or bilingual

Categories

Skills (49)

  • Beginner Intermediate Advanced
  • Methodologies
  • Architecture
  • Beginner Intermediate Advanced

Jose in a few words

Tengo sólidos conocimientos en el desarrollo de aplicaciones basadas en microservicios API REST y librerías de componentes comunes o modulares con Spring boot, diseñadas para ofrecer escalabilidad y respuesta estable a la alta demanda.

He participado en la creación de funcionalidades como: notificaciones móviles, colas de mensajería, cuestionarios personalizables, motor de recomendaciones, integración con APIs de terceros para recuperar datos de seguimiento de usuarios, balanceador de carga, descubrimiento de servicios, seguridad, API gateway, CDN, videollamada, chat y proxy inverso, entre otras.

En el ámbito de back-end he trabajado con: Java 11, Kotlin 1.7, Spring Boot 2.7, Zuul API Gateway y Spring Gateway, Gradle y Maven para la definición y construcción, Feign clients para comunicar microservicios, Eureka service discovery para detectar nuevos servicios y balancear la carga entre ellos, Nginx reverse proxy para establecer reglas de redireccionamiento o balancear la carga, RabbitMQ como cola de mensajería, REDIS como memoria caché, Elasticsearch para la búsqueda mediante índices, Firebase cloud messaging para el envío de notificaciones push, etc.

En el terreno front-end tengo conocimientos avanzados de Angular en sus últimas versiones +8. He creado aplicaciones web, altamente modulares, minimalistas e intuitivas integrando componentes de terceros y redefiniéndolos o creando propios. Tengo experiencia en el manejo de estilos tanto CSS como SASS.

También poseo conocimientos de DevOps para el despliegue de estos microservicios en contenedores Docker con jobs de Jenkins encargados de la automatización de diferentes procesos: ejecución de scripts de migración con Flyway, test unitarios con JUnit, análisis de código con SonarQube, creación de la imagen de Docker y subida al correspondiente Docker registry y finalmente despliegue de la aplicación. He trabajado con entornos cloud como Amazon Web Services.

Experience

Freelance Developer

Tech

Freelance BE Developer  - As a freelancer

October 2021 - Today (1 year and 4 months)

Development of a B2B e-commerce application for a fashion company, based on scalable Spring Boot (2.7) REST API microservices developed in Kotlin (1.7).

The platform is composed by a "core" project (a Spring-Boot starter library with all the common components and services shared by all the microservices) and a set of microservices focused on specific business areas.

Some of the features I have worked on are:
- Defining JPA specifications to encapsulate repository queries.
- Creation of Spring-batch scheduled jobs for handling a large number of records with focus on performance and data transactionality.
- A fully configurable dynamic reporting engine to create complex reports in Excel just by defining the query.
- Mapping automation with MapStruct.
- Fine tuning of the Spring Websocket Message Broker for real-time process updates.
- Configuration of auto-generated Swagger clients to build clients from OpenAPI 3 definitions.
- Increased code coverage to 90% on average using unit and integration tests with JUnit 5.
- Creation of the core commons starter library to limit duplication and improve development speed due to the reduced complexity of the new microservices definitions.
- Impact analysis and technical definition for a new microservice based on the BFF (Backend for Frontend) pattern to increase user experience and performace.

These microservices are deployed in Kubernetes pods on AWS. This process runs automatically using Jenkins pipelines, but I am comfortable using kubectl commands, and command line in general, due to the fact that I am a Linux user. Finally, all these microservices are fully monitored using Kibana and Grafana dashboards.
Kotlin Spring boot Kubernetes JPA Spring Batch Elasticsearch Kibana Grafana Linux

Eurecat - Centro Tecnológico de Catalunya

Tech

Full Stack Developer

Barcelona

February 2020 - October 2021 (1 year and 8 months)

Development of a new eHealth platform, based on Spring boot REST API microservices, designed to provide a common infrastructure and features for all the eHealth applications. Some of these features include: mobile notifications, customizable questionnaires, recommendation engine, integration with third-party APIs to retrieve user tracking data, load balancer, service discovery, security, API gateway, CDN, video calling, chat and reverse proxy, among others. These microservices are deployed in AWS inside Docker containers defined in a docker compose file. The tasks of the role include the development, deployment and management of the infrastructure.
Technologies and elements of the platform: Spring boot 2.3, Zuul API Gateway, Feign clients to communicate microservices, Eureka service discovery and load balancer, Nginx reverse proxy, RabbitMQ as messaging cue, REDIS as cache memory...

Development of new applications, from scratch, using the aforementioned platform. These applications provides specific functionalities such as: user management, patient monitoring, gamification, data collection through questionnaires and monitoring of physical activity and sleep. These features are exposed by a REST API and consumed by an Angular frontend. In relation to FE, the application uses common components provided by third-party libraries and custom ones using a layered pattern. Styles are defined using SASS templates.
Technologies used: Spring boot 2.3 for the backend (Java/Kotlin) and Angular 8 for the frontend.
Java Kotlin Spring boot AWS Nginx Jenkins SonarQube Redis RabbitMQ

Almato AG

Java J2EE Developer

Barcelona

September 2019 - February 2020 (5 months)

Development of new features and lifecycle control of a Workforce Management System for retail

Getronics Iberia

Junior Java Developer

Barcelona, Cataluña, España

January 2018 - August 2019 (1 year and 7 months)

New eBanking web platform development. Java-Spring.

Getronics Iberia

Trainee Java Developer

Barcelona

November 2017 - January 2018 (2 months)

Required internships 317h

Education

  • University Master's Degree in Computer Engineering

    Universitat Oberta de Catalunya

    In-progress

    Master's subjects and access credits

  • Desarrollo de Aplicaciones Multiplataforma

    Institut Obert de Catalunya (IOC)

    2017

  • Bachelor of Engineering - Degree in Architectural Technology

    Universitat Politècnica de Catalunya

    2019

    Bachelor Tesis: Analysis and implementation - Green roofs web application (honors) Finalist in the Catalonia Construction Awards 2020.

  • Bachelor of Engineering - Degree in Civil Engineering

    Universitat Politècnica de Catalunya

    2010

    Relevant Subjects: Calculus, Algebra, Structures, Geometry, Numerical Methods, Mechanics, Soil Mechanics and Electrical engineering.