Arnaldo Palmero Diaz
@arnaldopalmerodiaz
SQL Server developer focused on fintech transactional logic and ETL reliability.
SpainWhat I'm looking for
I’m a SQL Server developer and database engineer with 9+ years of experience building and improving transactional and operational database systems, especially in fintech environments. I specialize in stored procedure development, ETL pipelines with SSIS, and transactional business logic for high-volume payment and loyalty platforms.
I’ve delivered end-to-end work across design, implementation, testing in TEST environments, and production releases—often resolving incidents by reproducing issues in TEST, debugging stored procedure logic, analyzing JSON payloads, and running full regression checks before promotion to PRO. In my recent work, I implemented loyalty and fraud rules in database logic, achieving a 65% reduction in fraudulent transactions and a 55% increase in transaction frequency, while automation of data integration pipelines contributed to an estimated €250,000 in annual savings.
Experience
Work history, roles, and key accomplishments
SQL Server Developer & Engineer
Grupo DISA
May 2023 - Present (3 years 1 month)
Designed and maintained stored procedures and transactional business logic for a high-volume card payment platform, contributing to a 65% reduction in fraudulent transactions and a 55% increase in transaction frequency. Built SSIS ETL/data synchronisation between SQL Server and Azure SQL, and reduced production incident resolution time to 1–3 days through TEST-to-PRO replication and regression tes
IT Operations Technician
Grupo DISA
Jul 2022 - May 2023 (10 months)
Deployed modern point-of-sale technology across 200+ locations, reducing average customer transaction time by 30%. Improved system reliability by reducing critical downtime by 25% via proactive monitoring and preventive maintenance, and cut technical resolution time by 45% by streamlining troubleshooting workflows.
Independent IT Infrastructure Consultant
Independent
Jan 2016 - Jan 2023 (7 years)
Provided remote and on-site infrastructure support to 150+ international and local clients while maintaining a 98% retention rate. Built automation solutions to resolve complex technical issues 40% faster than standard benchmarks and reduced SMB IT expenditure by 15% through cost-effective cloud and device management strategies.
Independent IT Consultant
Self-Employed
Jan 2016 - Jan 2023 (7 years)
Provided remote and on-site infrastructure support for 150+ international and local clients, maintaining a 98% retention rate. Built personalised automation solutions that resolved complex technical challenges 40% faster and reduced SMB IT expenditure by 15% through cloud and device management strategies.
Education
Degrees, certifications, and relevant coursework
Advanced Vocational Qualification in Network Systems Administration
Advanced Vocational Qualification, Network Systems Administration
2020 - 2022
Completed an Advanced Vocational Qualification in Network Systems Administration from 2020 to 2022 in Tenerife, Spain.
Vocational Training in Microcomputer Systems and Networks
Vocational Training, Microcomputer Systems and Networks
2016 - 2018
Completed Vocational Training in Microcomputer Systems and Networks from 2016 to 2018 in Tenerife, Spain.
Tech stack
Software and tools used professionally
Availability
Location
SpainAuthorized to work in
Social media
Job categories
Skills
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