Senior Software Engineer - Ad Tech Mediation in Royal Leamington Spa

Level Up Your Career! 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
• LinkedIn Learning
• 25 holiday days + bank holidays
• 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.

Responsibilities:

• 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

Requirements:

• 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

Benefits:

• Generous Holiday: 25 days of annual leave, plus bank holidays. Earn an extra day for each year of service, up to 5 years
• Flexible Working: Core hours with flexibility, and a bank of "Work From Home" days
• Health Cover: Private medical cover, life assurance, a solid pension plan, and cover for dental and optical care
• Recharge: On‑site gym, supportive atmosphere prioritising wellbeing
• Free Food & Drink: Unlimited free snacks and drinks throughout the day
• 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 with free parking and electric charging stations
• Merch & Events: Exclusive Kwalee merch, seasonal events, and regular town halls
• Growth & Learning: Full access to LinkedIn Learning to support continuous professional development

Our Commitment to Diversity & Inclusion

At Kwalee, we take pride in being an equal opportunity employer, where we believe that diversity and inclusion are essential to driving creativity. We are committed to creating a safe, welcoming, and supportive environment where everyone can thrive. Our culture is built on celebrating the diverse voices of our team members, fuelling innovation and strengthening our connection to our players. We are dedicated to advancing equity, diversity, and inclusion across all areas of life, including age, disability, gender identity, marriage and civil partnership, pregnancy and maternity, race, religion or belief, sex, and sexual orientation. We recognise the importance of self‑development, career progression, and well‑being in retaining our talented team. At Kwalee, we celebrate individuality and encourage everyone to bring their authentic selves to work.