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Xavier Mas LeszkiewiczXM

Xavier Mas Leszkiewicz

Fullstack Engineer, Software Architect, Mobile App

$500/day
1 project
Dubai, AE
8-15 years

Average response time: 1 hour

About Xavier

I have Spanish and British citizenship. I am a curious person who looks forward to learning things every day. I am really passionate about technology, teaching, and coaching. I am the author of two Java manuals. I love teaching students and coaching people. I do really like to interact with groups to contribute to my ideas.

Related to technology, my main fields of interest are Java, Big Data, Computer Science, Project Management, and Coaching.

CEO and Frounder of different companies.
  • Spanish

    Native or bilingual

  • Catalan

    Native or bilingual

  • English

    Fluent

  • Portuguese

    Conversational

  • German

    Conversational

Can work on-site
Dubai (up to 20km), Abu Dhabi (up to 20km)

Experience

  • Up
    Dress
    January 2025 - Today (1 year and 5 months)
    Dubai City, United Arab Emirates
    CTO Dress Up Your infinite wardrobe

    Get All the Clothes You Want Without Buying Them.
    An app where you can rent luxury clothes similar to Dubizzle or. Wallapop for exclusive clothes
    React Native cto aws
  • BlueBerryBytes
    CEO and Founder
    October 2024 - Today (1 year and 8 months)
    Dubai - United Arab Emirates
    At Blueberry Bytes, I lead the technological vision and execution, driving innovation across multiple projects. My role encompasses architecting scalable solutions, overseeing engineering teams, and ensuring the seamless integration of AI-driven and cloud-native technologies.
    that power our products. I also work closely with product, marketing, and business teams to align technology with strategic goals, optimizing performance, security, and user experience.
  • Lumenalta (formerly Clevertech)
    Senior Software Engineer
    February 2023 - March 2025 (2 years and 1 month)
    New York, NY, USA
    Swap Health (Ionic, React, Firebase, Google Cloud)
    • Developed a cross-platform mobile app (iOS/Android) with offline sync, push notifications, and real-time analytics.
    • Integrated Firebase Authentication and Firestore, improving data consistency and security.
    • Built a custom analytics dashboard, allowing stakeholders to track user engagement. AAA (General Motors Messaging System - Node.js, AWS Lambda, DynamoDB, SQS)
    • Designed and implemented a serverless architecture, reducing operational costs by 30%.
    • Built a real-time messaging system using WebSockets and AWS SQS, ensuring high availability.
    • Implemented a failover mechanism using AWS Step Functions to enhance fault tolerance.

Reviews

5.0

Out of 1 rating

DanielD

Daniel

DANIEL JUÁREZ MARTÍNEZ

Reviewed on 05/01/2022

Xavier es una persona muy proactiva y profesional, se preocupa por las necesidades del cliente y está en todo momento pendiente de la calidad y el resultado final del proyecto, además, analiza el conjunto del proyecto y propone ideas ideas que mejoran el resultado. Ha demostrado unos conocimientos muy avanzados en el área de programación en PYTHON. En conclusión, un excelente trabajo. Lo recomiendo¡¡¡¡

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Education

  • Postgraduate in Big Data Management and Analytics
    UPC School (Universitat Politècnica de Catalunya)
    2016
    This Postgraduate programme considers both aspects in depth: management (Big Data Management) and exploitation of data (Big Data Analytics), while providing applicability and a business vision within this system.
  • Bachelor thesis
    Technische Universität Berlin
    2015
    Title of the project: Object Tracking with multiple cameras using real world coordinates. Abstract: This thesis covers the design and implementation of a Gaussian Mixture Probability Hypothesis Density Filter. A new approach is used on this filter, instead of using the object detections in pixel coordinates, a camera system is attached to this filter in order to treat the detections of all objects in real world coordinates. The thesis is intended to be an enhancement of the typical GM-PHD Filter. The system is able to work in an scenario with multiple views and also shows a top image view generated from all the views. This new approach allows using multiple detectors, reducing the probability the missed detections. The results are subjectively better using one detector in world mode but using more detectors some noise is produced by the camera system affecting negatively to the system.

Certifications

Skill set (34)

Categories