Senior Software Engineer - Ad Tech Mediation

At Kwalee, you’ll join a gaming powerhouse that boasts a mobile empire with 1.5 billion+ downloads alongside a thriving PC & Console division that has achieved numerous global chart-topping releases across Steam, Consoles, and Amazon, driving millions of Wishlists. Most recently publishing breakout hits such as The Precinct and Town to City. It’s a unique chance to bring your expertise to a global studio that dominates both the mobile, and the indie PC and Console space.

At Kwalee, as well as a competitive salary we also offer;
Private Medical Insurance, Dental Insurance, Life Assurance, Royal London Pension, a Free On-site Gym, Dog-friendly Office, Linked In Learning, 25 holiday days + bank holidays, and 1 day extra holiday for each year of service capped at 5.

As we continue to grow, we are now looking for a Senior Software Engineer – Ad Tech Mediation to join our Engineering team.

As a Senior Software Engineer, you will be responsible for designing, developing, and optimising Kwalee’s mobile ad mediation SDK. You’ll play a key role in improving monetisation performance, ensuring SDK reliability, and driving scalable ad tech solutions. You will work closely with Publishing, Product, BI, and external partners to deliver high-impact results across our mobile games portfolio.

This is a permanent role based in our Leamington Spa studio , with 5 days per week on-site , where collaboration and technical excellence drive innovation.

• Own the design, development, and maintenance of mediation components within the mobile SDK
• Develop, maintain, and optimise mediation and ad tech SDK components in Objective-C/SWIFT within Xcode for iOS and Kotlin/Java within Android Studio for Android.
• Integrate and maintain third-party ad network SDKs and monetisation tools.
• Improve SDK architecture for scalability, performance, and ease of integration.
• Support mediation optimisation including waterfalls, bidding, and segmentation strategies.
• Collaborate with BI and monetisation teams to translate performance data into technical improvements.
• Build and maintain CI/CD pipelines, automation tools, and internal development frameworks.
• Troubleshoot integration issues and support internal game teams.
• Ensure compliance with platform requirements (GDPR, ATT, Google Play, App Store policies).
• Establish monitoring, logging, and alerting for SDK performance and reliability.
• Mentor junior engineers and contribute to best practices, code quality, and team growth.

• Minimum 5+ years of experience as a Senior Software Engineer, ideally within the Ad Tech space.
• Strong programming skills in Kotlin (Android Studio) and Swift/Objective-C (Xcode)
• Experience working with large-scale shared codebases and improving performance.
• Experience integrating and maintaining third-party SDKs and libraries.
• Proficiency in scripting languages such as Python and Bash .
• Experience building development tools, automation scripts, and internal pipelines.
• Strong debugging, problem-solving, and optimisation skills.
• Experience with Unity and C# is a plus.
• Ability to mentor and support junior developers in a collaborative environment.
• Comfortable working cross-functionally with publishing, development, and external partners.

Why Kwalee?

Generous Holiday:
Start with 25 days of annual leave, plus bank holidays. You'll also earn an extra day for every year of service, up to 5 years!
Flexible Working:
We offer core hours that allow you to work flexibly around your life, and a bank of 'Work From Home' days to use when you need them.
Health Cover:
Private medical cover, life assurance, a solid pension plan, and cover for dental and optical care.
Recharge:
Take advantage of our on-site gym and a supportive atmosphere that prioritises your wellbeing.
Free Food & Drink:
Fuel your day with unlimited free snacks and drinks.
Gaming Goodies:
Receive Steam codes for all our game releases!
Dog-Friendly Office:
Bring your furry friend to our vibrant, fun office.
Office

Location:

Leamington Spa office location, with free parking and electric charging stations.
Merch & Events:
Get exclusive Kwalee merch, enjoy fun seasonal events, and stay informed with regular town halls.
Growth &…