Backend systems
Services and integrations built for clear behaviour and maintainable evolution.
Jose Alberto Lorenzo · Backend software engineer in Barcelona
Software systems that stay understandable under pressure.
I design and evolve backend services and web platforms, specialising in Java, Kotlin, Spring Boot and cloud-native systems with a practical focus on reliability and maintainability.
How I work
Engineering that makes the next change safer.
I value clear boundaries, useful documentation and small decisions that reduce operational friction over time.
Web platforms
Fast, accessible interfaces that support the product instead of competing with it.
Reliability & security
Careful attention to the operating context, dependencies and risk surface.
Working stack
Technology in service of the system.
A compact view of the technologies I use professionally across backend, data, infrastructure and web delivery.
- Java · Kotlin
- Spring Boot · Quarkus
- PostgreSQL · Oracle
- MongoDB · MySQL
- Docker · Kubernetes
- AWS · Linux
- Messaging · Observability
- Astro
Experience
Backend, platforms and operational context.
Backend, platforms and operational context.
November 2022 — Present
MANGO
Backend Software Engineer · Remote
Backend development and evolution of services supporting purchases, returns and logistics processes across multiple markets, with a focus on reliability, maintainability and integration with internal and external platforms.
- Design and evolution of Java and Spring Boot services and APIs.
- Integration with internal systems and external logistics and service providers.
- Production troubleshooting, framework migrations and improvements to observability and operational reliability.
February 2022 — September 2022
Amaris Consulting
Backend Developer · Client: Orizon · Remote
Developed ETL and data-processing workflows for SMF and CSV files using Java 11 and Spring Cloud Data Flow across streaming and batch workloads.
- Built stream and batch pipelines with Spring Cloud Stream and Spring Cloud Task.
- Worked with PostgreSQL and Kafka in data-ingestion and processing flows.
- Contributed to the operation and evolution of distributed data-processing jobs.
May 2021 — February 2022
Zitro
Backend Software Engineer · Sant Quirze del Vallès, Barcelona, Spain
Worked in the core server team responsible for processing game events and coordinating communication between distributed game clients and backend services in a regulated gaming environment.
- Developed REST APIs and Java 8+ microservices using Netflix OSS.
- Worked with MongoDB and MySQL for application and transactional data.
- Integrated asynchronous messaging with RabbitMQ and deployed containerised services with Docker and Kubernetes.
May 2019 — May 2021
NexTReT
Full-stack Software Developer · Client: CCMA-TV3 · Barcelona, Spain
Supported the engineering teams at Televisió de Catalunya, contributing to backend platform services, web publishing tools and data-processing environments used by TV3.
- Developed and maintained backend applications with Java and Spring.
- Contributed to frontend systems using JavaScript, ECMAScript and Backbone.js, with API documentation through Swagger.
- Provided occasional support in Big Data environments involving HUE, Spark and Storm.
January 2019 — May 2019
Activex Informáticos
Software Developer · Barcelona, Spain
Contributed to two projects: a streaming solution built with TIBCO StreamBase and a backend application for add-on sales and new products.
- Developed backend functionality with Java, Spring and Hibernate.
- Worked with Oracle and SQL Developer for persistence and data access.
- Contributed to web interfaces using Bootstrap.
July 2018 — January 2019
Deloitte
Operational Risk Advisory · Barcelona, Spain
Worked as a level-one operational risk analyst, reviewing security vulnerabilities and supporting their management and remediation lifecycle.
December 2017 — July 2018
Witeklab
Backend Developer · Barcelona, Spain
Developed Python software for communication and interaction between Pycom devices in IoT-oriented environments.
Selected work
Short cases, grounded in the work.
A selection of projects that reflect how I approach real technical and product challenges.
Web application · DAW final project
Local Torrent
- Challenge
- A final web-development project that needed a complete, usable product scope.
- Solution
- Designed and delivered a web application as an end-to-end development project.
- Architecture
- Web application
- Stack
- Web development
- Impact
- A complete project used to demonstrate applied web-development practice.
Proof of concept · Services marketplace
EventiumBCN
- Challenge
- Connect event-sector professionals with clients looking for their services.
- Solution
- Built a proof-of-concept platform organised around service requests and credits.
- Architecture
- Marketplace web platform
- Stack
- Web platform
- Impact
- Made the request flow and professional discovery central to the product.
Personal website · WordPress
Miriam Valera
- Challenge
- Create a focused personal web presence that is easy to maintain.
- Solution
- Delivered a WordPress-based personal site tailored to the client’s content.
- Architecture
- CMS website
- Stack
- WordPress
- Impact
- Provided an editable home for the client’s professional presence.
Website improvement · Accessibility
Full4media
- Challenge
- Bring an existing website closer to accessibility standards.
- Solution
- Reworked the site to improve its conformance with accessibility requirements.
- Architecture
- Existing web platform
- Stack
- Web accessibility
- Impact
- Improved the site’s accessibility baseline for a broader audience.
Contact
Have a system that needs a steady hand?
I am open to conversations about backend engineering, reliable platforms and web systems.
Message me on LinkedInInitial contact is via LinkedIn.