Senior Software Engineer, Chiswick

Position Summary

Light & Wonder is the global leader in cross-platform games and entertainment. The company brings together 5,000 employees from six continents to connect content between land-based and digital channels with unmatched technology and distribution. Guided by a culture that values daring teamwork and creativity, Light & Wonder builds new worlds of play, developing game experiences loved by players around the globe. The company’s Infinity platform powers the largest digital-gaming network in the industry. Light & Wonder is committed to the highest standards of integrity, from promoting player responsibility to implementing sustainable practices.

We are seeking a highly experienced Senior Software Engineer to lead the technical internalisation of our Remote Gaming Server (RGS).

Responsibilities

• Gaining deep technical ownership of the existing system.
• Leading knowledge transfer from the external vendor.
• Assessing architectural risks and technical debt.
• Establishing internal engineering standards and practices.
• Laying the foundation for a future RGS team.
• Own the codebase: Act as the primary technical owner of the RGS application and the go‑to engineer for design, stability, and technical direction.
• Understand the system end to end: Gain deep understanding of the flow from API through state machine, game engine execution, wallet calls, and data persistence.
• Maintain the platform: Diagnose and fix bugs, update dependencies, manage technical debt, and keep tests and documentation up to date.
• Improve efficiency: Identify and implement performance improvements in database access, caching, serialisation, and other critical code paths.
• Drive modernisation: Plan and execute incremental upgrades to language versions, dependencies, and tooling without disrupting production or compliance sensitive areas.
• Guard correctness and compliance: Ensure game logic, wallet flows, and RNG usage remain correct, consistent, and auditable where required.
• Collaborate across teams: Work with product, DevOps, and engineers to support releases, prioritise work, and contribute to the long term technical roadmap.
• Small deliveries: Provide small deliveries driven by jurisdictional rules.

Qualifications Python

• Strong professional experience with Python (recent 3.x versions)
• Comfortable working in large, long‑lived codebases
• Experience with object‑oriented design, classes, and mixins

Web / API Development

• Experience with a Python web framework such as Pyramid, Django, Flask, or similar
• Building and maintaining REST or GraphQL APIs

Databases

• Strong SQL skills and experience with PostgreSQL
• Schema design, query optimisation, and indexing
• Experience with database migration tooling (e.g. Alembic)

ORMs

• Experience using SQLAlchemy or similar ORM frameworks
• Ability to work with both ORM abstractions and raw SQL when required

Redis

• Experience using Redis for caching or session/state management in backend systems

GraphQL

• Practical experience designing and working with GraphQL APIs
• Familiarity with schemas, queries, and mutations

State Machines

• Ability to read, reason about, and maintain explicit state machines (e.g. gameplay or session lifecycle)

Testing

• Writing and maintaining automated tests (e.g. pytest)
• Experience with integration tests and test fixtures

DevOps & Tooling

• Experience working with Docker
• Familiarity with CI/CD pipelines
• Modern Python packaging and dependency management experience (e.g. uv, pip-tools, poetry or similar)

Documentation

• Ability to work with and improve technical documentation (e.g. Sphinx or similar tooling)

Additional Information Why would you enjoy working with us at Light & Wonder?

• Competitive benefits, an open and supportive environment as well as a modern and exciting workplace.
• The opportunity to interact with global teams on a regular basis and the possibility to switch teams and projects as you and our business continues to develop and grow.
• Exciting projects with opportunities for creating positive change to our game engineering ecosystem.

And if that is not enough; you will get to enjoy a stunning work location and flexible working whilst we provide you with the guidance and development skills you need to progress quickl and enhance your career.

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