Backend & Data Systems Engineer with 10+ Years

DANIEL CALZADO ALDANA

SOFTWARE ENGINEER BACKEND & DATA ANALYST IT SYSTEMS

***************@*****.*** linkedin.com/in/daniel-calzado-0782142b5 PROFESSIONAL SUMMARY

Software Engineer with over 10 years of technical experience transforming complex business needs into scalable digital solutions. Specialized in Backend architectures and Data Analysis, with a proven track record of developing critical systems such as accounting platforms and international Point of Sale (POS) software. Expert in optimizing operational efficiency through advanced automation and strategic data management within high-stakes production environments. TECHNICAL SKILLS

Backend & Frameworks: Python (Django, REST APIs, Python Server-side logic). Data Analysis & Visualization: Streamlit, SQL (PostgreSQL, MySQL, SQLite), NoSQL, Pandas, Matplotlib.

Frontend & UI: JavaScript (AJAX), HTML5, CSS3, Flet, PyQt. Automation: Python Automation Scripts, Telegram/WhatsApp Bots, Data Workflow Optimization. PROFESSIONAL EXPERIENCE

Custom Software Engineer (Freelance)

Remote (USA, Cuba, Mexico, Italy) August 2020 - Present Data Automation (Telecommunications Sector, USA): Developed advanced automation scripts to process and analyze production line metrics, significantly optimizing plant operational performance.

Custom Software Development (POS): Designed and implemented custom Point of Sale

(POS) software primarily for clients in Cuba, with additional deployments in Mexico and Italy, managing inventory logic and real-time transactions. Accounting Software Engineering: Created a dedicated accounting platform for non-profit organizations, automating financial management and donation reporting with high precision. Dashboards & Reporting: Utilized Streamlit and Pandas to create interactive KPI visualizations, enabling real-time data-driven decision-making for clients.

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IT Systems & Software Engineer

Cuba September 2009 - August 2020

Inventory Software Development: Designed and implemented a custom software solution for tracking and managing local IT assets, including servers, workstations, and peripherals. Infrastructure & Server Management: Administered network servers and SQL/NoSQL data infrastructures, ensuring the integrity, security, and availability of corporate and local area network (LAN) services.

Systems Automation: Implemented scripts to optimize backups and monitor critical services, reducing enterprise system downtime.

EDUCATION & CERTIFICATIONS

Bachelor of Science Degree in Information Technology (U.S. Equivalency) Enrique José Varona University of Pedagogic Sciences, La Habana, Cuba Official Evaluation: Verified by Josef Silny & Associates, Inc. (NACES Member) as equivalent to a U.S. Bachelor of Science in Teaching Information Technology. Python Essentials 1 & 2 Certifications: Python Institute, 2024. LANGUAGES

Spanish: Native.

English: Professional Working Proficiency.

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