Ryan Fessler Email & Phone Number

Waltham, Ma, Us

Waltham, Ma, Us

Boulder, Co, Us

Boulder, Co, Us

• In charge of developing and maintaining all software for the company, which produces several different laser systems. This includes backend code to control the lasers and communicate with hardware in the system, and frontend code to provide controls to the user and visualize data.• Developed, from project conception to customer shipment, a new Windows desktop application written in C# with a WPF user interface (MVVM pattern) for controlling a vacuum ultraviolet (VUV) laser source.• Improved and maintained existing applications written in LabVIEW (interfaced with C#) for controlling an ultrafast Ti:Sapphire laser amplifier system and a high harmonic generation (HHG) laser system.• Interfaced software with many different hardware devices over various protocols (serial, TCP/IP, I2C, Modbus, analog).• Wrote device control code for ADCs/DACs, cameras (USB and GigE), delay/pulse generators, environmental sensors, general purpose I/O devices, laser diode drivers, motors, picoammeters, pressure controllers, spectrometers, and temperature controllers.• Added an API to a laser system so customers could control the system with commands over TCP/IP or through a DLL.• Started developing the framework for a control application written in Python with a Qt user interface (QML).• Worked closely with laser, electrical, and mechanical engineers to develop and improve the laser systems.• Kept the software backwards compatible as new versions of the laser systems were developed.• Often had to accommodate specialized, one-off versions of the laser systems in the existing software.• Used C# wherever possible in the LabVIEW applications to decrease development time.• Provided software support for customers of our laser systems.• Interviewed potential candidates for various positions at the company.• Used Jira to track tasks, bugs, and progress.• Managed Jira for the company.• Used Git for version control.

Boulder, Colorado, Us

• Prototyped a thermal cycler subsystem for a product in development using an embedded system written in C (Atmel SMART ARM) that communicated over USB to a control UI written in C# with a WPF user interface (MVVM pattern).• Improved and automated internal software written in C# for training neural networks (FANN library) that characterize the influenza virus subtype of human and animal-origin samples.• Applied the concept of error correction codes to neural networks to improve performance.• Analyzed neural network output data to improve performance.• Added new data analysis and visualization features to internal software (PCA and k-means/hierarchical clustering) using the R language interfaced with C#.• Learned WPF, the MVVM pattern, and R.

Boulder, Colorado, Us

• See the description for "Software Engineer" at InDevR, Inc.

Wi, Us

• Wrote and maintained the biophysics department's internal software written in LabVIEW and C# for controlling electron paramagnetic resonance (EPR) systems and acquiring, processing, and displaying experimental data.• Completely redesigned the existing internal software to make proper use of OOP principles, making it highly modular so that new experiments, devices, and features could be added in a much quicker and simpler manner. • Worked on all layers of the software: user interface, application logic, experiment logic, hardware detection, device control code, and data/settings saving and loading.• Started with no LabVIEW experience and very quickly became well-versed with the language.• Used GPIB, USB, and TCP/IP to control and communicate with devices in the EPR systems.• Wrote device control code for ADCs, arbitrary waveform generators, averagers, delay/pulse generators, function generators, magnetic field controllers, microwave sources, and phase sensitive detectors.• Wrote hardware detection algorithms to detect all devices connected to an EPR system in order to determine the experiments the user is capable of running.• Wrote software to design waveforms (sine, square, triangle, sawtooth, trapezoid, and chirp) for arbitrary waveform generators.• Wrote scripts to automate repetitive, tedious coding tasks such as creating the private data accessors for LabVIEW classes.• Used version control software (TortoiseSVN) to manage changes to the code base.• Performed testing to ensure all code was functioning correctly.• Set up PCs and instruments for new EPR systems.• Worked closely with engineers and scientists with different backgrounds to improve user experience and add desired features.• Documented all code thoroughly and wrote instructions for adding new experiments and instrument control code to the software.

Wi, Us

• See the description for "Engineer I" at the Medical College of Wisconsin.

Cork, Ireland, Ie

• Worked on a large multidisciplinary engineering team to design a chiller control system.• Performed unit, integration, system, and performance testing.• Improved C, C++, and C# skills by reading product code and writing software to stress test the user interface.• Learned SQL in order to validate entries in a MS Access database.• Participated in numerous code reviews.• Became familiar with version control (IBM Rational Synergy).• Wrote documentation for testing protocols and software.

Cork, Ireland, Ie

• See the description for "Intern Technical II" at Johnson Controls.