(Contract) Senior Game Engineer

About Us

At Trailmix, our players are the very reason we exist and our mission is to create delightful spaces where millions of people can flourish. Our hit game Love & Pies, launched in September 2021, has resonated with millions worldwide and we build free-to-play mobile games that are snackable yet filled with heart, humour, and stories that stick

We’re a focused and highly collaborative team with a big creative spirit. We believe the best games are made when the people behind them feel inspired, supported, and proud of the work they do.

That’s why our values sit at the heart of how we work, shaping every decision and creative choice we make.

Trailmix Values

• We win as one: Success is shared, and collaboration fuels everything we do because great games are never built solo.
• We are resilient by nature: We adapt and rise stronger each time because every challenge is a chance to evolve.
• We are powered by our players: Every choice begins with them because when our players thrive, so do we.
• We are kind and direct: We speak with honesty and care because clarity and compassion build the trust that makes us better.
• We stay curious and grow: We ask, explore, and learn because curiosity keeps our creativity alive.
• We decide boldly and own fully: We move with courage and conviction because great ideas only matter when we stand behind them.

Our values are what set Trailmix apart: they guide us in crafting games that are joyful, authentic, and player-first. We've created a workplace where both people and players feel seen, supported, and inspired. If you’re excited by meaningful creativity, true collaboration, and making games that bring people joy, you’ll feel right at home here, too.

The Opportunity

This is a 3-month contract position for a Senior Game Engineer, you will be reporting to the Engineering Lead. You’ll be responsible for accelerating developer productivity and platform reliability across our mobile titles by evolving shared systems, CI/CD, observability, and release workflows. You will partner with gameplay and content teams to remove friction, raise quality bars, and shorten time-to-ship.

Responsibilities

• Own build/CI/CD pipelines and release automation (caching, test gates, artifact/versioning, rollback paths).
• Lead Unity project architecture, shared packages/modules, and upgrade strategies.
• Establish standards for telemetry, profiling, and performance budgets; drive regression detection.
• Implement feature flags/remote config patterns and experimentation hooks.
• Improve environment management (secrets/provisioning, sandbox/staging parity, config as code).
• Define and evangelise technical standards, branching/PR conventions, and code review guidelines; author runbooks and docs.
• Create developer tooling (scaffolds/CLIs/templates) to speed feature delivery and reduce toil.
• Partner with Ops to integrate observability and incident workflows into platform tooling.

Requirements

• Senior-level Unity/C# experience delivering complex features and shared systems at scale.
• Demonstrable expertise in CI/CD for mobile, package/SDK management, and release automation.
• Strong grasp of telemetry, performance tooling, and reliability engineering within game teams.
• Excellent communication and mentoring skills; proven cross-discipline collaboration.

Bonus

• Experience with Kubernetes/GKE build farms, PlayFab/Metaplay SDKs, and mobile store pipelines.

At Trailmix, we care as much about how you work as what you deliver. We believe that when people feel safe, inspired, and proud of what they do that passion flows directly into our games and ultimately our players feel it.

That means we’re looking for someone who:

• Builds impact through collaboration: You know the best work comes from shared perspectives and collective wins (we win as one).
• Grows stronger through challenges: You adapt, stay positive, and help others find a way forward when things get messy (we are resilient by nature).
• Keeps players at the heart of decisions: You design, create, and problem-solve with empathy, knowing players are our why (we are powered by our players).
• Communicates with clarity and care: You give feedback that builds trust, and you listen openly so ideas can flourish (we are kind and direct).
• Stays curious and lifts others up: You experiment, learn quickly, and share your discoveries generously, raising the bar for the whole team (we stay curious and grow).
• Moves with courage and ownership: You make bold calls when it matters, and you stand by them with accountability (we decide boldly and own fully).

Why Trailmix?

As a member of our team, you’ll work in an environment where collaboration and creative energy drive everything we do. We believe that working closely with colleagues from across departments is essential to crafting the best experiences for our players. Our office is a place where ideas come together, and we work side by side to turn them into reality.

Our London Studio Location

Our hybrid work model combines the flexibility of remote work with the creative energy of being together in person.

We work from our Kings Cross studio together three days a week — Monday, Thursday, and Friday, because we believe great games (and great teams) are built through genuine collaboration.

These days are focused, energised, and designed for impact:

• We solve problems faster
• We share ideas in the moment
• We drive decisions that move us forward

This rhythm helps us deliver our best work not just for each other, but for our players. It’s how we build momentum, grow together, and stay ahead in a fast-moving industry.

Our Inclusive Culture

Trailmix was founded to make a positive impact on our players, our community, and our colleagues. We’re committed to creating an inclusive culture where everyone can flourish and feel seen.

We believe it’s vital that players see themselves represented in the games they play; and in Love & Pies, we celebrate the beautiful diversity of life. The stories, characters, and relationships in our games reflect the people we are and the people we love.

We’re always excited to welcome more people who share our passion for designing games that truly include everyone.