Samuel Rohrer
Verified Expert in Engineering
Software Developer
Washington, DC, United States
Toptal member since June 11, 2019
Samuel has over five years of experience designing and implementing software solutions that leverage available hardware and accelerators. He prefers to work on complex projects that require distributed systems and machine learning expertise. Some highlights of his work include RESTful API and stateful logic design, synthetic data generation, convolutional neural networks for object classification, Hadoop and Spark for big data processing, and high-performance data processors.
Portfolio
Experience
- C++ - 8 years
- Java - 6 years
- Python 3 - 6 years
- Concurrent Programming - 5 years
- Databases - 5 years
- Cloud Environments - 4 years
- Pandas - 4 years
- Agile Project Management - 4 years
Preferred Environment
Build Systems, C++, Java, Cloud Environments, Julia, Python 3, Eclipse IDE, Spacemacs, Visual Studio Code (VS Code)
The most amazing...
...Toptal project I've completed is a Python chatbot for Meta Workplace using webhooks that searched Atlassian Confluence.
Work Experience
Senior Machine Learning Engineer
MITRE
- Managed a team of five people developing a system that automatically generates hazardous autonomous driving scenarios with descriptive metadata. Evaluated options for data generation, predictive models, and system orchestration. Presented findings.
- Parallelized evaluation of reinforcement learning algorithms to accelerate analysis of performance. Modified simulation framework to accommodate new scenarios.
- Constructed a multi-class object classifier for synthetic-aperture radar imagery using a convolutional neural network and benchmarking tools to evaluate performance using PyTorch.
- Built public key infrastructure user authentication using an Apache HTTP server container. Implemented user authentication and role-based authorization for GUI using a Python decorator.
- Designed and implemented generic order-matching software using Java and Spring Framework that could simulate markets using the NetLogo programming language.
- Constructed data loaders to sync a Hadoop-distributed filesystem with a Linux filesystem and PySpark functions for academic paper processing and analysis.
- Built a GUI to control and analyze the results of the signal processing system. Containerized the system using Docker into front and back-end services. Used Python for back-end process control.
Software Engineer II
Rapid7
- Implemented cross-index object matching, filtering, and sorting to allow more advanced queries of distributed NoSQL document search framework using Java and Spring Framework.
- Responded to customer-reported defects with fixes for vulnerability management software products.
- Developed elements of the hybrid cloud insight platform to be more performant using microservices, generic design patterns, Spring Framework, Spark, and Elastic MapReduce.
- Upgraded the existing codebase to interface with the new version of Elasticsearch.
Quantitative Software Developer
Cubist Systematic Strategies
- Engineered an options trader that queried multiple banks for the price of an options contract and then could execute a trade for it. The design focused on the mechanics of queries, parsing, and message passing.
- Built high-performance market data parsers using C++ and Linux parallelization.
- Interfaced real-time market data vendor Java API and SQL database using Java.
- Implemented upload of historical market data sources to the database using Python and Bash.
FPGA Engineer Intern
Uber
- Developed FPGA design to test cameras during manufacturing that integrated with GeniCam interface.
- Investigated the usefulness of the Vivado High-Level Synthesis C++ tool versus SystemVerilog.
- Interned during the Summer of 2016 and Summer of 2017 as a FPGA engineer.
Experience
Containerized Full-Stack Machine Learning App
Python Confluence Chatbot for Meta Workplace
Sound Recognition on Embedded Device
Education
Bachelor of Science (BSc) Degree in Computer Engineering
University of Michigan - Ann Arbor, MI, USA
Skills
Libraries/APIs
Pandas, PyTorch
Tools
Eclipse IDE, MATLAB
Languages
Python 3, C++, Java, Julia, C, Embedded C, SystemVerilog
Storage
Databases, Cloud Environments
Frameworks
Spring, Hadoop, Spark
Paradigms
Concurrent Programming, Agile Project Management
Platforms
Docker, Visual Studio Code (VS Code)
Other
Build Systems, Version Control Systems, APIs, Webhooks, Embedded Systems, FPGA, Computer Engineering, Probability Theory, Control Systems, Operating Systems, Computer Architecture, Computer Vision, Signals, Signal Processing, Digital Signal Processing, Matrix Algebra, PKI, Research, Programming Languages, Design for Manufacture & Assembly (DFMA), Microsoft Office, Machine Learning, Reinforcement Learning, Deep Learning, Convolutional Neural Networks (CNNs)
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