Senior Principal AI/ML Engineer

Salary: £70,000 - 110,000 per year

Requirements:

• Deep experience building and shipping production AI/ML systems with meaningful business impact
• Strong applied expertise in areas such as personalization and causal inference
• Track record of connecting AI/ML methodology with real production guardrails, constraints, and operational use
• Proven ability to influence technical direction across teams through credibility, clarity, and execution
• Experience defining shared patterns, technical standards, or architectural direction in complex environments
• Ability to lead senior-level technical discussions with substance and precision
• Excellent communication skills, with the ability to explain complex technical ideas clearly to both technical and non-technical audiences
• Proven ability to influence across departments and align teams around shared technical direction
• Strong mentoring capability, especially with senior engineers and technical leaders
• Comfortable representing technical work in high-visibility forums, internally and externally
• Able to shape product bets through technical insight and co-create reusable capabilities with cross-functional partners
• Effective working across engineering, analytics, product, and platform teams
• Strong judgment in translating business goals into scalable technical systems
• Experience with large-scale experimentation platforms, personalization systems, or decisioning infrastructure
• Familiarity with game technology, player-facing optimization, or content adaptation systems
• Experience reducing fragmented or bespoke ML workflows into shared technical foundations

Responsibilities:

• Influence technical direction across Candy Crush Saga in AI/ML and decisioning through credibility, clarity, and delivery
• Stay hands-on through meaningful production coding, technical prototyping, and implementation work on critical paths
• Set a high bar for production AI/ML engineering, including reliability, observability, maintainability, and quality of execution
• Mentor senior engineers and raise the standard of technical judgment, design quality, and cross-team collaboration
• Lead the shared architecture for AI/ML and automated decisioning systems used across multiple components in Candy Crush Saga
• Help unify fragmented approaches into reusable technical foundations that improve consistency, speed, and scalability
• Partner with product and game teams to turn high-value opportunities into reusable capabilities rather than one-off solutions

Technologies:

• AI
• Support
• Mobile

More:

We are King, a leading interactive entertainment company for the mobile world with a mission of Making the World Playful. We have more than 20 years of history delivering iconic games, including Candy Crush Saga and Farm Heroes Saga. Our games are played by more than 200 million monthly active users, and we are part of Microsoft. This Senior Principal AI/ML Engineer – Decision Automation role sits within our Candy Crush Saga Decision Automation team, a cross-functional AI/ML group working with product, analytics, engineering, game teams, and central platform partners to accelerate our learning loop through automated insight generation, experimentation, and adaptation at scale. The role is based in Stockholm, Barcelona, or London, and our work spans large-scale causal inference, simulation, orchestration, and shared decisioning systems that support player-centric experiences.

last updated 36 week of 2026