Guy Hale

Serving as the engineer beneath the tech lead, owning and advancing multiple core NFL services for market creation, suspension, and settlement, within a microservice-based platform powering a $100m annual GGR betting product.

• Led the NFL migration of market-making, suspension and settlement microservices to Microsoft Orleans to reduce system latency from 1s to < 100ms.
• Troubleshot and resolved critical issues in complex, distributed, real-time systems affected by unpredictable sports-feed data.
• Mentored junior and mid-level engineers, bridging domain knowledge gaps and strengthening team capability.
• Implemented robust unit testing, integration testing and promoted best practices to improve system reliability.
• Utilised the builder and director patterns to provide readable abstractions for instantiating complex data required for scenario testing.
• Created a mutation testing github workflow to provide a means for evaluating unit test coverage.

Key Skills: .NET 9, C# 13, Microsoft Orleans, Distributed Systems, MySQL, AWS, XUnit, TDD.

Played a pivotal role in the MLB system upgrade for the 2025 season.

• Rapidly gained deep domain knowledge, becoming a recognised key contributor and crucial to the MLB team's success, delivering a product that generates $30m in annual GGR.
• Solely implemented the backend logic for a process named manual settlement, which enables traders to override fixture stats and alter the settlement of markets. This logic worked perfectly in production during the season.
• Expanded product offering for the upcoming season by leading the end-end planning, development and testing of new markets.
• Introduced unit testing to the team and led the implementation of a thorough unit test suite.

Key Skills: .NET 9, C# 13, Microsoft Orleans, Distributed Systems, MySQL, XUnit, AWS.

Expanding the functionality of a data-driven lending solutions platform. This has included:

• Utilised data-structures (Hash tables and Tries) to facilitate performant in-memory matching processes that reinforced a "company adversity checks" feature.
• Implemented an event-driven microservice system for web-scraping that generated millions of rows of valuable data.
• Created normalised database schemas to model relational data with MySql. Optimised database query performance.

Key Skills: .NET 8.0, C#12, AWS, MySQL.

Working within the website team as a full-stack engineer intern. This included:

• Implemented new features using React.Js and Ruby.
• Ensured software reliability by writing unit and integration tests.

Key Skills: Ruby, ReactJs, Git, CI/CD.