William Grim, M.Sc.

I am a software and data engineer with a broad array of experience in various industries from finance to videogames.

Experience

Grim Services Inc.

Owner / CEO	Remote	April 2021

• Officially began the company in May 2022 but have been consulting since April 2021.
• Started with one big data client (Monad) and have been steadily adding ever since.

Belvedere Trading

Data Engineer	Remote	July 2022 - Present

• Built an Airflow-based system for loading data into or modeling data in Google BigQuery
• Built a Java Spring-based data pipeline to load data from Apache Pulsar into Google BigQuery

Monad

Data Engineer	Remote	April 2021 - June 2022

• Improved transformation performance 50x by rewriting to use AWS Lambda, AWS EMR, and Spark SQL via dbt.
• Scaled connectors handling hundreds of gigabytes of data at a time.
• Built all of Monad’s MVP data models and transformations in dbt:
  • Snowflake
  • PostgreSQL 13

Belvedere Trading

Principal Software Engineer	Chicago, IL	November 2018 - April 2021

• Mentored company in software best practices and company’s broader goals.
• Managed a team and implemented a new, high performance message bus built around NATS.
• Designed and rewrote a Python-based service discovery service with much expanded capabilities.

Signal: A TransUnion Subsidiary

Principal Software Engineer	Chicago, IL	December 2016 - October 2018

• Designed, managed a team, and coded a Java + Guice Aerospike scanner to generate events on Kafka, Kinesis, or SQS
• Designed and coded an event-driven Java + Guice profile graph deletion algorithm
• Profiled and enhanced Signal’s data-driven identity services application.
• Redesigned a Java batch process so it can handle 10-20x the traffic via Kafka.

Roblox

Senior Software Engineer	San Mateo, CA	March 2013 - February 2015

• Initiated and ported our C++ game servers to Linux to save our company significant costs in OS licenses.
• Implemented custom libcurl wrapper and caching layers:
  • Cut CDN bandwidth in half.
  • Consolidated multiple HTTP implementations to one.
• Ported ROBLOX C++ game engine to Android:
  • Developed cross-platform facades between C++ ↔ Java JNI for atomics, threading, and OpenGL
  • Developed custom signal handlers for enhanced debugging
  • Implemented proper crash dump reporting
  • Announced ROBLOX for Android at Virtual BLOXcon 2014.
• Rebuilt ROBLOX’s sound management engine using FMOD

Morgan Stanley

IT Associate	Purchase, NY	August 2007 - January 2013

Levi, Ray, and Shoupe, Inc.

Software Developer	Springfield, IL	May 2001 - December 2004

Southern Illinois University

Unix/Linux System Administrator	Edwardsville, IL	March 2002 - May 2007

Education

City University New York	B.Sc. in Pure Mathematics (incomplete)
Southern Illinois University Edwardsville	M.Sc. in Computer Science

Skills

Preferred Languages	C / C++, Java / C#, Python
Cloud Platforms	AWS, DigitalOcean, GCP
Data Engineering / Science	Airflow, Prefect, Jupyter Notebooks
Technologies	PostgreSQL, Redshift, Snowflake, EMR + Spark, Kafka, NATS Messaging, Kubernetes
Platforms	BSD, Linux, Mac OS, Windows
Training	ML / AI, SaaS / Cloud Computing / Distributed Architectures, Operating System Design, Combinatorics and Graph Theory, Real Analysis, Linear Algebra, Algorithmic Design and Analyses
Industry Experience	Finance, Gaming, Ad Tech, Cybersecurity, Consumer No-Code / Low-Code Tooling
Natural Languages	English (native), French (Fluent)