Senior Software Engineer

Light & Wonder; Chiswick; On-site; GBP 90,000 - 130,000; Full time

Benefits offered by this job

Stunning work location

Flexible working

Career development support

Job summary

Light & Wonder in the United Kingdom is seeking a Senior Software Engineer to lead the technical internalisation of the Remote Gaming Server (RGS). You will own the codebase, drive architectural decisions, and collaborate with product, DevOps, and other engineers to deliver scalable game backend systems.

The role focuses on high‑quality backend services, API design, and investment in modernisation while ensuring compliance and reliability in a global iGaming ecosystem.

Qualifications

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

Responsibilities

• 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: implement performance improvements in database access, caching, serialization, and other critical paths.
• Drive modernisation: plan and execute upgrades to language versions, dependencies, and tooling without disruption.

Skills

Python

Web/API Development

Databases

ORMs

Redis

GraphQL

State Machines

Testing

DevOps & Tooling

Documentation

Tools

Docker

CI/CD pipelines

uv

pip-tools

poetry

Job description

IGaming

If it’s iGaming, we know a thing or two. At Light & Wonder, It’s all about the games, and our digital team leads the global iGaming market, providing jaw-dropping content and innovative software that powers the world's most successful online gaming providers.

IGaming

If it’s iGaming, we know a thing or two. At Light & Wonder, It’s all about the games, and our digital team leads the global iGaming market, providing jaw-dropping content and innovative software that powers the world's most successful online gaming providers.

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. To learn more, visit lnw.com. We are seeking a highly experienced Senior Software Engineer to lead the technical internalisation of our Remote Gaming Server (RGS).

The Successful Candidate Will Be Responsible For

• 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

Responsibilities Include

• 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 quickly and enhance your career.