We’re working with an established international iGaming business that develops online slot games across regulated markets globally.

The business is now investing in the next generation of its game-engine technology, with a focus on modernising the underlying architecture, improving mathematical validation and building a new slot game engine from the ground up.

This hire will play a key role in shaping that next engine and the technical direction of the platform.

You’ll join a small specialist team alongside another Game Engine Engineer and a Game Mathematician, with significant ownership across architecture, mathematical validation and delivery.

What you’ll be doing

- Designing and building a new slot game engine from scratch
- Owning game-engine projects end to end
- Working closely with mathematicians to turn mathematical models into production software
- Building simulations to validate game behaviour and expected outcomes
- Working with RTP, RNG, probability models and payout logic
- Comparing production data against simulations and expected mathematical behaviour




- Investigating discrepancies and improving engine architecture
- Helping define the technical direction of future game-engine development

What they’re looking for

- Strong software engineering experience
- Proven experience building or owning game-engine, simulation-engine or similarly complex backend systems
- Ideally, experience building engine technology from scratch
- Strong understanding of mathematical or probability-driven systems
- Experience with simulations, RTP, RNG, probability or payout mechanics
- High ownership and evidence of delivering complex projects end to end
- Ability to work closely with mathematicians and translate mathematical requirements into reliable software
- Direct experience within slots, casino or iGaming is highly desirable

The technology stack is C++.

This is not a Unity, Unreal, graphics or gameplay-development role . The focus is on the underlying engine responsible for game logic, mathematics, simulations and payout outcomes.

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📌 Senior Software Engineer - Game Engine (España)
🏢 Stott and May
📍 España