Working on large scale distributed system for storage and query billions of time series data.

DNA Encoded Library Project:1. Improved the efficiency of bulk importing from client-side files, containing millions of records, to SQL server database tables. Decreased the importing time from more than 10 days to about 2-3 mins. Implemented business logic in middle tier C# code.2. Designed relational database diagrams for storage of the next-generation sequence data and score metrics.3. Worked in an agile environment, using Jira, scrum board, and confluence.4. Created web pages using C#.Net, javascript, and SQL serverCustomizable UI tools:1. Created tools that enable users to customize their own homepages (e.g. the display format, aggregation function, hyperlinks, templating, etc.)

1. Built single page site displaying yearly geospatial related statistics on work visa applications using Dash Plotly. (https://myh1bapp.herokuapp.com)2. Wrote application to optimize and visualize structure of clusters of Lennard-Jones particles using Java Swing. (https://github.com/wenxu1024/TPS)3. Built convolutional neural network using Keras to perform image recognition of handwritten digit (MNIST data), achieving accuracy of 95%. (https://wenxu1024.github.io/projects/convnn.html)4. Built neural network with 2 hidden layers to detect anomalies in credit card usage data using Keras and Pandas. (https://wenxu1024.github.io/projects/densemodel.html)5. Wrote tutorial comparing and contrasting different convex optimization methods. (https://github.com/wenxu1024/Optimization_Tutorial)6. Build a webpage to display the geospatial real estate information for Greater Boston Area using Django with MySQL backend and D3.js.7. Wrote Principal Component Analysis (PCA) in Jupyter notebook to perform dimension reductions to sets of images.

1. Built thermal desorption aerosol gas chromatograph systems for hourly molecular resolved measurement of ambient aerosols.2. Wrote Firmware (in C) for the electronics of the gas chromatograph systems.3. Developed desktop control and data logging software based on .NET framework for the gas chromatograph and mass spectrometer systems.4. Developed and improved desktop software for thermal denuder (a system for measuring gas and particle partitioning of semi-volatile organic molecules) also based on .NET.5. Wrote Igor Pro procedure for analyzing gas chromatograph data and time series

1. Worked on designing and characterization of intermediate pressure aerodynamic lens (focusing particles) and capture vaporizer (reducing particle bounce)2. Wrote Igor Pro procedures to analyze aerosol mass spectrometry data.3. Wrote python scripts for parsing Gaussian or GAMESS output and then calculate ion - molecule collision cross sections and electron impaction ionization cross sections.4. Develop a desktop software for estimating ion composition for chemical ionization mass spectrometry using Java Swing.

1. Worked on Chemical Ionization Mass Spectrometry detection of organic molecules in the air. Achieving on the order of several ppt to ppb concentration levels.2. Build an electrometer for charged particle counting using Faraday Cup and femtoampere meter.3. Build a particle size magnifier using super saturated di-ethylene glycol to condense on pre-existing particles.4. Build an electrospray aerosol particle generator.5. Wrote software for controlling the particle generator, size magnifier, and electrometer in LabVIEW.6. Carried out molecular electronic structure calculation using Gaussian09 to study the interactions between organic molecules and sulfuric acid.7. Carried out Molecular Dynamics simulation of molecular clusters to sample the possible conformers of the cluster.8. Wrote Fortran procedures to carry out Basin Paving Monte Carlo simulation to study the conformers of organic acid-sulfuric acid molecular clusters.9. Worked on hygroscopicity measurement of particles using a differential mobility analyzer and cloudcondensation nuclei counter.

Saturated absorption hyperfine spectroscopy of metastable Krypton.