Freelancer profile translated to English.
Back to original languageAbout Sergio
I am aSolutions ArchitectandBackend Developerwith over 5 years of experience in projects for banking, retail, and healthcare sectors. I specialize in the design, development, and modernization of complex systems, data integrations, and process optimization.
I have worked for clients such as CaixaBank, Inditex, and the Canary Islands Health Service, leading projects in:
- REST and SOAP API Integration.
- Data streaming and cloud computing processes (AWS, GCP, Azure, Confluent Kafka).
- Backend development in Python and Java.
- Migration and modernization of legacy applications.
- Automation of critical processes to reduce costs and time.
My approach is to thoroughly analyze the client's needs, propose the best technical solution, and execute it efficiently, using modern tools and leveraging the potential of artificial intelligence to support development.
If you are looking for a profile that combines technical vision, analytical skills, and experience in high-performance environments, I can help you turn your ideas or technical challenges into real, scalable solutions.
Spanish
Native or bilingual
English
Fluent
Romanian
Native or bilingual
Can work on-site
Madrid (up to 50km)
Experience
- Universitat de les Illes Balears
On Malt
Data Scraping and Consolidation from TripAdvisorAugust 2025 - August 2025Madrid, EspañaData Engineering Project with TripAdvisor API
I led the strategy and execution of a data scraping project for a research paper, performing the following tasks:*Data Engineering:Design and automation of an ETL (Extract, Transform, Load) pipeline in Python and Pandas.*API Integration:Intensive work with the official TripAdvisor API, managing authentication, request limits (rate limits), and error handling (429, 403).*Scraping Strategy:Development and execution of a geographical sweep methodology for exhaustive point of interest discovery, overcoming API limitations.*Data Quality and Cleaning:Processing raw data to remove duplicates, validate record integrity, and ensure the consistency of the final dataset schema.*Technical Consulting:Analysis of different API solutions, budget management for external costs, and strategic communication with the client to align technical objectives with project deadlines. - DXC TECHNOLOGYBusiness Application EngineerMarch 2023 - Today (3 years and 5 months)Madrid, SpainInditex:
- Management and optimization of on-premise and cloud data, using a central CLI engine in Java as middleware for loading and analyzing information on distributed platforms.
- Monitoring and administration of cloud environments with Confluent Cloud, AWS, Google Cloud, and Azure, integrating alerts and metrics in Grafana to ensure availability and performance.
- Implementation of data flow improvements to optimize speed and reliability in high-volume transactional environments.
CaixaBank- Design and maintenance of credit risk models in Python, applying calculations and monitoring key indicators to measure the financial viability of loans for individuals and businesses.
- Integration of business logic with internal systems to improve accuracy and speed in decision-making.
- Use of data analysis and processing tools to ensure consistency and quality in the information used.
Canary Islands Health Service- Modernization and migration of applications, mainly services with APIs in Python and Express, integrated with Angular frontend and SQL databases.
- Development and maintenance of REST and SOAP APIs for interoperability between health systems and third parties.
- Optimization of critical processes through automation and redesign of architectures to improve response times and reduce errors.
Experience in retail, banking, and healthcare sectors, combining functional analysis, backend development, and process optimization. Specialized in data and cloud environments, API integration, and system modernization. Ability to adapt quickly to new environments and provide scalable and efficient solutions. - AIRON GROUPJava Consultant / AEAT Project (Customs Department)November 2021 - February 2023 (1 year and 3 months)Madrid, Spain
- Backend development in Java and microservices for the Spanish Tax Agency (AEAT), Customs area.
- Management of bureaucratic import and export processes, including data validation, document control, and optimization of internal workflows.
- Use of SQL for queries, reports, and maintenance of critical databases.
- Integration and maintenance of forms and services oriented towards customs management processes.
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Education
- Prompt Engineering for DevelopersUdemy2024Prompt Engineering for Developers
- European University (U.E.M)2021