Improve functionality of a billing application to add several features.

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In my professional experience, I've been working as a Freelancer, a Young Researcher in the field of Image Processing and a Social Entrepreneur (still working the three of them separately), as a Computer Vision Algorithm Developer, Control and Communication Engineer and Web Developer, as well as doing some independent projects. I have worked with PLCs, FPGAs, mikrocontrollers, single-board computers, robotic arms, etc. I have a high knowledge of Matlab/Octave, Python, Simulink, C, mikroC and Arduino, PLC programming: LD, ST, FBD/CFC, SFC and IL, Audacity, UsborNexus/Nexway and Open/Libre/Microsoft Office. I have a good knowledge of VHDL, C++, WordPress, Protheus, Git, Linux Shell/CMD scripts and utilities, Assembly language, C#, Pascal, MPLAB, Adobe Photoshop and Illustrator. I have basic knowledge of Julia, Lua, CSS, HTML, JavaScript, PHP, Android Studio, Java, R, Basic, Xmipp, Mindstorms, LabVIEW, Wavelab, Unreal Engine, World Machine, Guitar Pro, AbletonLive, Sibelius and Adobe InDesign.