Hire the Best JSP Developers
in Spain

I have more than 5 years of experience developing Android applications. I enjoy using and learning modern tech-stack and environments, estimating costs or developing time and providing valuable solutions. My main competences could be summarised as follows: • Android: Native Kotlin/Java (MVVM, LiveData, Coroutines, ViewBinding, Retrofit, Koin, Picasso, Dagger, Jetpack Compose) • Web Frontend: Bootstrap, JQuery, JS, CSS, JSF, PrimeFaces, RichFaces, JSP • Persistance: SQLite, Room, MySQL and NoSQL databases (GraphQL, MongoDB, Firebase Realtime Database) • Testing: JUnit // Mockk • Methodologies: Jira, Agile, SOLID

I'm a Liferay 7.4 developer with experience creating, migrating, and maintaining web portals for small and medium-sized businesses. I specialize in: Custom OSGi modules and Liferay Objects (data modeling + custom logic) Client Extensions and React for modern, decoupled UIs APIs with REST Builder and OpenAPI Integrations with external systems via REST/GraphQL Multilingual content Adapting Figma designs into responsive Liferay components and pages I focus on delivering clean, maintainable code, iterative project delivery, and clear communication. Collaboration through written updates is my standard to ensure smooth progress. I enjoy taking projects from initial design to production, solving technical challenges, and implementing solutions that scale. Additional Skills (Voice Work & Illustration) Alongside my development work, I collaborate on Spanish voiceover and TTS recording projects. I recently completed a 3-hour Spanish dataset for an Upwork Enterprise client, delivering clean, normalized mono audio (48 kHz / 24-bit) for AI training purposes. I also create hand-drawn pencil illustrations, including characters, portraits, and clean line-art drawings. My work is fully hand-drawn (no AI, no filters) and suitable for children's books, concept art, and technical sketches.

More than 3,000 hours worked with a 5-star rating. "He is definitely one of the best developers I have worked with. Definitely will hire Jorge again!" "Jorge has proven himself to be a valuable member of our development team." Over 15 years of experience in search and data technologies, back-end systems, and Python-related technologies. Experience in Python, Django, NodeJs, Javascript, and TypeScript. Founder of Internet search engine Buscaplus, indexing millions of web pages. I love to build high-availability systems that work fast, build good API interfaces, and provide search technology to companies. I like to provide value to my clients through agile software development, very good communication skills, and great teamwork skills. Databases. PostgresSQL, MySQL, Oracle, ElasticSearch, Cassandra, Firebase, MongoDb, CosmosDb

Master-level specialist holding a triple-degree stack in Mathematics, Computer Science, and Artificial Intelligence. Veteran Upwork contractor (active since 2017) specializing in rigorous algorithm verification, technical STEM writing, and machine learning model evaluation. Specialized in ■ Math-stats modeling ■ Machine learning, deep learning ■ Graph/network processing (Hidden Markov Models, Dynamic Bayesian Networks) for e.g. adaptive systems/algorithms and time-series (feature) analysis ■ Multimodal human-computer interaction ■ Python/Jupyter core data science (Scipy stack, Seaborn) and ML libraries (Scikit Learn) as well as DL libraries (keras, tensorflow) ■ Other programming languages (bash, MySQL, R, Matlab/Octave, Mathematica, C, Java and LaTeX). Academically recognized: ◙ (2013-2015) Awarded a Mutua Madrileña Foundation Postgraduate Scholarship : A two-year monthly stipend granted to highly-achieving students for pursuing international postgraduate studies in Europe, America or Asia. ◙ (2011-2012) Granted an International Mobility Scholarship for pursuing courses at the Graduate School of Science of The University of Melbourne (Experimental Mathematics and Knowledge Technologies). ◙ (2009-2010) Achieved a first-class weighted average and High Distinction in Knowledge Engineering as an Exchange student at the School of Mathematical Sciences of the University of Nottingham.