Game Designer, Mathematician

Rush Street Interactive

Senior Game Designer responsible for designing and mathematically modeling original online casino games at Rush Street Interactive. Collaborating with teams to ensure engaging and compliant player experiences in a fast-paced environment.

Posted 4/24/2026full-timeRemote • 🇺🇸 United StatesSeniorLead💰 $160,000 - $180,000 per yearWebsite

Tech Stack

Tools & technologies

JavaScriptPython

About the role

Key responsibilities & impact

Design and define the functional mechanics for original online casino games, including base game structures, bonus round triggers and flows, progressive jackpot systems, gamble features, cascading/grid-style mechanics, and meta-game experiences
Build the complete mathematical models for each game, including RTP targets, volatility profiles, hit frequency, standard deviations, prize distribution, and payout structures
Create and maintain PAR sheets, combination sheets, and all regulatory math documentation required for internal review, testing laboratory certification and regulatory approvals
Define symbol hierarchies, paytable structures, reel layouts (including non-traditional formats such as grid slots and cluster-pay), win-line configurations, and feature trigger conditions
Build and run simulation code (Python, C++, C#, Javascript, or equivalent) to validate math models, verify behavior across gameplay scenarios, and test edge cases
Write demo and prototype code to rapidly test mechanic concepts before full production commitment
Evaluate existing casino concepts for adaptation into RSI’s online real money gaming environment
Create comprehensive Game Design Documents (GDDs) and functional specifications for engineering, art, audio, and production teams
Ensure all math models meet regulatory requirements across RSI’s operating jurisdictions, adapting designs for market-specific RTP ranges, win caps, odds requirements, and fairness standards
Play-test and iterate on in-development games, providing feedback on math balance, mechanic feel, feature pacing, and edge case behavior
Analyze post-launch game performance data and recommend math and mechanic adjustments to live games
Maintain and contribute to RSI’s internal game design standards and style guides
Collaborate with creative leads by providing functional specifications and mechanic requirements that inform visual and thematic direction
Work with software engineers to verify math implementation in code and review game software during development
Partner with designers and product managers to brainstorm concepts, refine games in progress, and share best practices

Requirements

What you’ll need

Bachelor’s degree in mathematics, statistics, applied mathematics, computer science, physics, engineering, or a closely related quantitative field required. Master’s degree or higher in a quantitative discipline preferred.
8+ years of direct, hands-on experience in slot game design and/or slot game mathematics within a land-based or online casino game studio environment. This is a non-negotiable requirement — candidates without direct slot game experience will not be considered.
Expert-level knowledge of casino game mathematics: RTP calculation, volatility modeling, hit frequency analysis, standard deviation, prize distribution, combinatorics, and probability theory
Proven ability to design engaging slot game mechanics across different gambling concepts and styles, including innovative feature structures, bonus flows, progressive/jackpot systems, and paytable economics
Proficiency in building and running game math simulations and verification scripts using Python, C++, C#, Javascript or equivalent programming languages
Advanced Excel skills for probability modeling, paytable prototyping, and large-dataset analysis
Deep familiarity with PAR sheet creation and regulatory documentation standards for online and/or land-based slot games
Strong understanding of player psychology, behavioral engagement patterns, and what makes slot games commercially successful
Excellent communication skills with the ability to translate complex mathematical concepts into clear documentation for both technical and non-technical audiences

Benefits

Comp & perks

Discretionary annual company bonus (Eligibility Varies by Role)
401(k) plan with 100% company match on the first 4%
Comprehensive medical coverage (HSA & FSA plans), dental, and vision insurance
Paid Time Off (Eligibility Varies by Role)
Employee Assistance Program (EAP)

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Applicant Tracking System Keywords

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Hard Skills & Tools

slot game designcasino game mathematicsRTP calculationvolatility modelinghit frequency analysisstandard deviationprize distributioncombinatoricsprobability theorygame math simulations

Soft Skills

communication skillscollaborationfeedback provisionproblem-solvingcreativityanalytical thinkingadaptabilityattention to detailcritical thinkingplayer psychology understanding