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David Lozano Jarque

David Lozano Jarque

Computer Science Engineer. Passionate Systems Administrator, Full-stack software developer and Cryptography and secure systems fan

Mollet del Vallès, Barcelona, ES
+34 644 449 360
Spanish, Catalan, English




Technology and specially computer science has always been a diversion since a was a teenager at highschool. Since I discovered computer science, I wanted to turn my hobby into my profession, and started learning computer science on my own. After that, I decided to study a computer science engineering degree at and have been launching several projects as a freelance since then. Not just to provide IT services to businesses but also developing innovative projects on my own with some colleagues to try to help evolve our world into the future. Currently, I offer those services as a freelance and spend my free time researching Bitcoin and blockchain related technologies. Moreover, I'm also studying a cibersecurity master's degree at to enhance my knowledge in IT security.

Work Experience

Work Experience

  • Software Developer (as freelance in an internship)SEAT S.A.

    Mar, 2017 - Jun, 20173 months

    Integration and adaptation of the IBC Biomechanics software with SEAT IT Systems for its internal biomechanical laboratory in the CARS center within the Martorell headquarters

    • Python 3.6 (using Anaconda)

    • GUI(s) using PyQt4/5

    • Database managment using ORM frameworks

    • MariaDB RDBMS management

    • SAP integration using APIs

  • Systems Administrator and IT consultant (as outsourced freelance)Meditrauma S.L.

    Jan, 2015 - Present

    Outsourced IT Systems and Infrastructure accountable of the three company headquarters, performing typical systems administration tasks and IT consultancy

    • LAN and WLAN TCP/IP networks installation and management (including cibersecurity tasks such as traffic filtering)

    • Servers installation and maintenance using Ubuntu and Microsoft Windows Server 2003/2012

    • Database setup and maintenance using Borland BDE, Microsoft Access and Microsoft SQL Server 7/2008

    • Network file sharing installation and maintenance (with permission management) using Samba protocol

    • Network printer spool services installation and maintenance using Canon, HP, Epson printers

    • Workstation installation and maintenance using Microsoft Windows 7/8/10 (also migrated old ones from XP) and setting up enterprise sofware including ofimatics and internal ERP customized software(s)

    • Installation and maintenance of DICOM networks and services

    • Installation and maintenance of point-of-sale devices

    • Installation and maintenance of medical equipment hardware and services such as X-Ray machines and ECGs

    • Installation and maintenance of laboral risk prevention devices like audiometers

  • Software Developer and IT consultant (as freelance)IBC Biomechanics

    Sep, 2014 - Present

    Design and development of a customized clinical reports generator software application based on Microsoft Word user-designed templates and using data exported from a collection of third-party applications that capture and analyze data from a patient using optical-tracking camera devices, EMG devices, foot insoles, dynamometers and inertial sensors

    • Python 2.7 / 3.6 (using Anaconda framework)

    • JavaSE 8 (using PyBluez to handle Bluetooth connections)

    • GUI(s) using PyQt4/5

    • Database applications using SQLAlchemy



  • Cybersecurity and cryptography
    Symmetric cryptography (AES, DSA)Public-key cryptography (RSA, ECDSA, ElGamal)Shared-secret-schemesPublic Key Infrastructure (PKI)Blockchain technologyBitcoin cryptocurrency (technical level)
  • Networks and System Administration
    TCP/IP protocols familyIEEE 802.3/11/15 (WiFi, Ethernet, Bluetooth)STPStatic and dynamic routingDTNsAutonomous SystemsDomain Name SystemTunneling & VPNs & OpenVPNIPsecTraffic filtering with iptables-like tools
  • Web Development
    HTML5CSS3JavascriptAJAXPHPResponsive designBootstrapJekyll
  • Programming (and markup) languages and frameworks
    AndroidAssembly (Intel x86_64)Bash / ShellBatch/DOSCC++CSS3HTML5JavaEE (J2EE)JavaSEJavaScriptJSONLaTeXMarkdownNodeJSPHPPythonQtSQLXML
  • Database management
    Borland BDEMariaDBMicrosoft AccessMySQLOracle Database 11gSQLiteSQLAlchemy
  • Operating Systems
    DebianJavaLinux-basedMicrosoft Windows XP/Vista/7/8/10Microsoft Windows Server 2003/2008/2012Ubuntu
  • Software Development
    CVS: Git, Git-flow (+GitHub and Bitbucket)Agile methodologiesSPMPSoftware AnalystSoftware designUse cases diagramsClass diagramsRequirements specificationUnit testing


  • Computer Science Engineering: IT Security, Master's degree, Open University of Barcelona (

    Sep, 2017 - Present

    Global average GPA: 3.38 (8.14/10 in Europe)
    Digital IdentityLegislation and RegulationSecurity vulnerabilitiesNetworks' securityDatabases' security
  • Computer Science Engineering, University degree, Autonomous University of Barcelona (

    Sep, 2013 - Jun, 2017

    Cum laude, Global average GPA: 3.85 (8.86/10 in Europe)
    Algebra and CalculusElectricity and ElectronicsComputer ArchitectureOperating SystemsSoftware DevelopmentDatabase Management (RDBMS and NoSQL)Agile MethodologiesComputer Networks (Advanced)Distributed SystemsSystems AdministrationInformation and Security (Advanced)PKIBig DataWeb ServicesDevOpsBlockchain technology (Advanced)Bitcoin development (Advanced)
  • Science and Technology, High school, Institut de Mollet del Vallès (

    Sep, 2011 - Jun, 2013

    Cum laude, Global average GPA: 3.96 (9.76/10 in Europe)
    CatalanSpanishEnglishIndustrial technologyMathsPhysicsTechnical Design (and CAID)EnterpreneurshipInternship (as computer technician)


  • 2nd place at University degree's gamification program

    Awarded on: Jun 25, 2016

    TOP Enginyeria is an engineering gamification program implemented in several engineering degrees that aims students to go further than classes with extra projects, competitions, challenges and games apart from traditional classes, awarding the best students with symbolic rewards and extra activities to motivate them in their studies and improve their rivailry to get the best performance possible