Manuel Marquez

Collaborated with the HorizonOS runtime graphics team at Meta Reality Labs, enhancing internal performance benchmarking tools for Meta Quest headsets. Designed the automated graphics regression test methodology and expanded rendering workloads to evaluate dynamic graphics features using C++, Vulkan, and OpenXR.

• Engineered automated regression tests that uncovered performance regressions and incorrect GPU load–dependent feature timing issues.
• Integrated dynamic resolution and additional dynamic graphics features into benchmarking tools with extended performance metric output.
• Created an internal OpenXR extension to expose runtime performance metrics, and integrated Perfetto tracing into the runtime and benchmarking tools for detailed performance analysis.
• Automated benchmark orchestration, Perfetto trace analysis, metric visualization, and invented a real-time Python graphing tool adopted by other teams.
• Enhanced OVR Metrics Tool to provide real-time performance metrics in new analysis scenarios.
• Extended the buck build system to support Apple VisionOS, successfully deploying a sample application.

Founded and operated a software company delivering both commercial and research software across graphics, simulation, and enterprise systems. Solely responsible for architecture, development, and deployment of dozens of products and internal tools in C#, WPF, ASP.NET Core, and LLVM.

• Architected a C# game engine featuring a Visual Studio project system with NuGet-based game content compilation, an extensible UI framework, physics engine, PBR graphics pipeline, and multiple development tools built with WPF and a 3D rendering control. Supported Direct3D 11/12, Vulkan, and OpenGL with both rasterization and ray tracing.
• Created a high-performance programming language with an LLVM backend, MSBuild project system, Visual Studio integration, and supporting editor tools.
• Crafted VB→C# and C#→C++ transpilers with Roslyn analyzers to automate large-scale code migration.

• Engineered a custom UI framework from scratch, modeled after WPF, featuring data binding, control styles, and GPU accelerated rendering with 3D graphics APIs.
• Authored a WPF control library with dozens of reusable controls, charting components, a reporting engine, MVVM framework, and customizable themed styles.
• Developed a LINQ-based data layer adopted across all applications, supporting SQL Server, Oracle, PostgreSQL, and SQLite with built-in synchronization for distributed and offline scenarios.
• Managed a GoCD-based continuous delivery system handling build versioning, automated testing, code signing, and web deployment.

• Produced ASP.NET Core web platforms (task tracker, forum, wiki) using EntityFramework and Bootstrap.
• Delivered WPF-based reliability engineering tools for RCM and FMECA, and collaborated with clients to build customized Access and Excel solutions with VBA automation.
• Constructed internal tools including Roslyn code analyzers, licensing systems, and maintained infrastructure for web hosting, domain provisioning, deployment pipelines, and customer distribution.

Contributed to the development of mass spectrometry software using C# and WPF, while leading an offshore team of 7 members at L&T in India to deliver UI and systems components within SCIEX’s core applications.

• Led and mentored an offshore development team, improving delivery efficiency and code quality through structured reviews and daily coordination.
• Implemented key WPF UI enhancements using Syncfusion and custom controls, increasing test coverage with NUnit and UI automation tests.
• Designed and deployed an integrated audit log subsystem adopted across multiple application modules.
• Served as the in-house expert for WiX installer and custom .NET bootstrapper development.
• Supported Agile workflows using JIRA and Git, ensuring seamless integration between onsite and offshore teams.

• Designed and implemented a CPU chip using an Altera FPGA.
• Successfully programmed a robot, equipped with a 68HC11 microcontroller, to navigate a complex maze. Recognized by the professor and awarded bonus marks for eliminating jitter caused by the base code by executing productive work equal to a required delay call for an infrared sensor.
• Hacked the user accounts of a server using a stack overflow attack on Linux for a lab project.

Designed a programming language similar to C# that compiles source code into LLVM IR with high performance being the main goal. Incorporated an MSBuild project system with Visual Studio integration and editor tools.

• Compiler support for primitive numeric types, arithmetic operations, data structures, fields, properties, arrays, conditional logic, loops, functions, and more.
• Classes and interfaces with support for polymorphic types, inheritance, upcasting, downcasting, virtual methods, method overriding, constructors, and allocation in heap memory.
• Pointers for types and low level memory operations.
• Function pointers and delegates for event systems.
• Implementation for UTF8 strings with basic functions including concatenation.
• Ability to declare and reference native C libraries and call operating system functions.
• Debugger support with breakpoints in Visual Studio.
• Core libraries for writing to the console, data collections, file system, performance measurements, and more.
• MSBuild project system with support for project references and NuGet packages.
• Visual Studio integration with editor tools including syntax highlighting, code formatting, code completion, code outlining, signature helper, code refactoring extensions, and more.
• Unit testing framework with Visual Studio Test Explorer integration.
• Compiler support for Windows and Linux.

Developed a 3D video game in C# with a custom game engine, CyberEngine. Engineered an orbital mechanics simulator, game world, user interfaces, and designed 3D models and texture assets.

• Orbital mechanics simulator for planets and space ships supporting gravity assist maneuvers and Hohmann orbital transfers.
• Graphic effects including atmospheric scattering, shadow mapping, parallax mapping, deferred lighting, real time clouds, glass, post processed blurring, glow and crepuscular rays.
• Extensive performance optimisations through multithreading, algorithm optimisation and occlusion rendering.
• Multiplayer support synchronizing worlds across a network.
• Custom game editor tools developed in C#.NET and WPF with hosted 3D rendering control.
• Modelling and animation in Blender and graphics design software.

Engineered a game engine in C# including custom Visual Studio project type, game content pipeline with NuGet support, user interface framework, and physics engine. Graphics support for Direct3D 11, Direct3D 12, Vulkan, OpenGL, rasterisation, and ray tracing.

• Custom Visual Studio project type with NuGet support to compile game and content files using a build task and MSBuild.
• Extendable game content pipeline to compile content files including vertex and pixel shaders, fonts, textures, audio files, 3D models, and animations.
• Code generator to automate a C# wrapper from the OpenGL specification file and contributed to open source project Vortice which uses SharpGen to generate C# wrappers for C libraries.
• Engineered a cross-compiler capable of generating SPIR-V and GLSL code from a unified HLSL shader, including a code generator that automated the creation of descriptor tables for various graphics APIs.
• PBR deferred shading rendering pipeline with BRDF materials and image based lighting environment maps.
• Constraint based physics engine with collision detection and response using a. Support for joints between objects enabling ragdoll physics and friction.
• Created a user interface framework from scratch similar to WPF with controls, control styles, data binding and rendering with 3D graphics APIs.
• Implemented dozens of controls including windows, panels, buttons, text boxes, sliders, list boxes, and popups.
• WPF game control to host 3D rendering in WPF applications.
• Performance testing using ETW event sources and analysis in Windows Performance Analyzer with custom regions to visualize performance.
• Implemented unit tests with xUnit to ensure comprehensive coverage of core components and validate GPU rendering outputs.

Library containing dozens of controls, charting controls, WPF based reporting engine and MVVM framework.

• Custom controls including a calendar, colour picker, gray scale shader effect, numeric textbox and paged data grid.
• Charting controls including line, point, column, pie and Pareto charts with data popup adorners.
• Reporting engine to convert WPF controls into XPS/PDF reports supporting headers, footers and paging.
• MVVM framework with support for custom sorting and filtering of data sets using lambda expressions.

Library of WPF control styles containing animations and various colour themes for dozens of different controls.

• Developed XAML control styles, incorporating various color themes, and designed custom icons for enhanced control aesthetics.
• Compiler to combine all colours, brushes, animations, and control styles in separate files into one single file for each theme.

API coded in C# to managing databases tables through classes, LINQ conversion to multiple database providers, synchronizing databases across a network both online and offline, and compressing and encrypting data over WCF channels.

• Custom WCF channel to compress and encrypt data by exchanging private AES encryption keys over a network using RSA similar to SSL. Verified encryption by intercepting network traffic with Wireshark and examining data.
• Base database class for manipulating XML based data files including compressing and encrypting data files with password salting and validating and upgrading data file versions.
• Normalized database class for interfacing with MS SQL, Oracle, PostgreSQL, and SQLite, by leveraging the ability to model databases in code and creating tables using reflection to convert classes into SQL database structures. Also supported the ability execute LINQ by converting expression trees into SQL queries for each particular DBMS.
• Database synchronization framework to synchronize databases across a network, supporting client to server, server to server, adding, updating, and deleting records while offline and replication actions to a server.

Tools developed in C# to facilitate the development of Mapromar products.

• Generated multiple Roslyn code analyzers to enforce coding standards and optimizations.
• Set up servers including Bonobo for Git, custom issue tracking web application, GoCD for continuous integration builds, NuGet for package management, and secured access with SSL certificates.
• Code signing assemblies as part of the automated build for products.
• Email marketing tool to send bulk emails with tracking info to determine which recipients responses.
• Serial key generator for products.

C# ASP.NET web application to market and deliver products to customers backed by database with Entity Framework.

• Web page layouts and CSS styling.
• User account and product serial key management.
• Telemetry from deployed desktop software and logging in database.
• PayPal and Stride integration for payment processing.

C# ASP.NET web application to highlight my resume, work portfolio, and provide downloadable code samples.

C# ASP.NET web applications for tracking software bugs and tasks, forum, and wiki.

• Create and edit posts backed by database with Entity Framework.
• Markdown editor for posts and comments.
• Automatic and custom job boards with manual sorting and triggers.
• User account management with roles for each project.
• Support for uploading and displaying files.
• IdentityServer4 to link accounts from all web applications.
• Full text search with Lucene.
• Front end designed with Bootstrap.

Automated code converter based on Roslyn to convert C# projects to C++. Successfully converted programs demonstrating performance improvements.

• Converter support for primitive types, arithmetic operations, data structures, fields, properties, arrays, conditional logic, loops, functions, and more.
• Core libraries in C++ for writing to the console, data collections, performance measurements, and more.
• C++ unit testing framework with Visual Studio Test Explorer integration.

Automated code converter based on Roslyn to convert VB projects to C#. Successfully converted all projects from VB to C# aggregating over 500K lines of code.

• Converter support for source code files retaining all formatting and comments, project files and solution files.
• Fully automated solution to convert entire solutions including library, console and WPF assemblies.

Product programmed in C# and WPF for Failure Modes, Effects, and Criticality Analysis (FMECA) and utilizing Mapromar libraries.

• Created WPF application including splash screen, all XAML views, view models, database design, reports, database file encryption, and custom controls built on top of all Mapromar libraries.
• Installer created using Wix and a custom .NET bootstrapper for consistent user experience.
• Code obfuscation using ConfuserEx.
• Quality assurance testing, bug fixes, support and maintenance.

Product programmed in C# and WPF for Reliability Centered Maintenance (RCM) and utilizing Mapromar libraries.

• Created WPF application including splash screen, all XAML views, view models, database design, reports, database file encryption, and custom controls built on top of all Mapromar libraries.
• Installer created using Wix and a custom .NET bootstrapper for consistent user experience.
• Code obfuscation using ConfuserEx.
• Quality assurance testing, bug fixes, support and maintenance.

Access and VBA tool for reliability consultant at Reliable Process Solutions for ranking the risk of equipment primarily targeted at the manufacturing industry.

• Created design requirements document to outline the scope of the project.
• Designed and coded entire application including all tasks described below for Reliability Centered Maintenance (RCM).

VB.NET and C#.NET console application to parse an input mathematical expression string and output the evaluation adhering to order of operations. This project would later be incorporated in a numeric textbox control within the Mapromar control library.

• Parse infix notation string (2+3) and convert to postfix notation (23+) in a stack for evaluation.
• Support for math operators, constants, and trigonometric functions.

Coded enhancements to earlier Jumble Word Solver project for performance increases enabling the solving of multi word puzzles.

• Downloaded open source books and parsed words into a dictionary file along with frequency counts.
• Restructured in-memory dictionary into an N-ary tree and improved algorithm efficiency for a significant performance increase.

Application coded in VB.NET and WPF to perform a Discrete Fourier Transform (DFT) on a sampled signal and determine its power spectrum. Possible future development is to use wavelets which are time-frequency analysis methods instead due to the limitation of a Fourier transform which does not include location information. This project was to learn signal processing techniques through a practical example.

• Graphing the original signal, sample data points, power spectrum and reconstructed signal using the charting control library I developed for Mapromar.
• Successfully determined the power spectrum of a cosine wave signal with added random noise.

Application coded in VB.NET and WPF to study feedback loop controllers for use in my video game Vegabot.

• Custom WPF graphing control to display position, velocity and acceleration data in real time.
• Derived equations using computer algebra system (CAS) software wxMaxima.
• Controller to follow a randomly moving target linearly and angularly in 1D.
• Auto pilot system to land a spacecraft on the surface of a planet.

Access and VBA tool for reliability consultant at Reliable Process Solutions for Reliability Centered Maintenance (RCM).

• Designed user interface, database tables, queries, reports and graphs for RCM analysis.
• Implemented serial key validation and created Excel file for client to manage serial key distribution to his clients.
• Provided support and maintenance to my clients’ end users.

Application coded in C++, VB.NET and WPF to interface with a PIC18F4550 microcontroller through USB programmed in embedded C. The microcontroller was programmed into a simple oscilloscope sending voltage data and also programmed to send accelerometer data from a chip.

• Programmed USB stack implementation.
• Installed firmware and set up USB driver to communicate with device using WinUSB.
• Console application coded in C++ to read button states and flash LEDs.
• Interfaced with unmanaged WinUSB driver in .NET taking care to pin objects and prevent the garbage collector from moving managed objects in memory.
• Used an ADC to measure voltage data and read accelerometer data from a chip over SPI which was sent to the PC where it was graphed in real time using a custom WPF control.

Application coded in VB.NET and WPF to search for a path between two points on a grid populated with obstructions. This project was to learn the A* (pronounced A star) path finding algorithm.

Designed and coded a VB.NET WinForms application prototype for Failure Modes and Effects Analysis (FMEA) including a diagram building tool. Primarily targeted at companies in the manufacturing industry and gained interest of a previous client. Received input from an engineer working at a manufacturing plant and held meetings to demo and discuss the project to the plant managers.

• Backend database in SQL Server Compact (SQL CE).
• Built a diagram building tool and code to enable printing the final diagram.
• Data grid for inputting FMEA and control plan data.

Application coded in VB.NET to organize MP3 files by reading ID3 tags and renaming and moving files to artist, album and track folders. This project was a practical application of manipulating file headers using byte data arrays.

Web application developed in ASP.NET and AJAX for a client to keep track of maintenance in the manufacturing industry.

• Met with client to obtain software requirements, created end user installation guides and helped IT set up and troubleshoot the system.
• Designed entire web application including database tables, queries, and reports, web pages for data input, analysis, user account management and graphic design.

Access and VBA tool for reliability consultant at Reliability Solutions for Reliability Centered Maintenance (RCM) to assist in his RCM methodology.

• Met with the client to obtain software requirements and an interested end user from one of the largest privately owned companies in the US, and one of the top 50 largest companies in the world by revenue. This company then flew me to their headquarters to meet with their worldwide IT manager and discuss the project.
• Designed database tables for a split database in the back end and created queries, reports and graphs for RCM analysis in the front end.
• Designed and coded the user interface including a tree view for easy navigation on the main data input page.

Excel and VBA tool for reliability consultant at Think Reliability for Root Cause Analysis (RCA). I obtained the contract while in high school and after teaching myself Excel and VBA in a single weekend. The client originally intended to give the tool away for free but upon delivery he commented that the product was almost too good and considered selling it instead.

• Coded a toolbar and other enhancements to speed up the process of creating diagrams for Root Cause Analysis (RCA).

Application to solve Jumble word problems coded in VB.NET WinForms primarily for fun and a learning experience. Solution accomplished by using a recursive algorithm to iterate through all permutations of a given string and filtering those words that exist in a dictionary file. Further enhancements were made to increase performance by sorting words and splitting the dictionary file.

While in high school, designed and built an H-Bridge circuit to control a stepper motor from an old 5¼” floppy drive using a computers parallel port. A desktop application was written in both Turing and VB6. A separate board and application was also created for outputting data to LEDs and reading button states.

Mentored grade 7-8 students in LEGO robotics at an elementary school.