Senior Software Engineer I
London, England
Kargo creates powerful moments of connection between brands and consumers to build businesses. Every day, our dynamic teams work to radically raise the bar on what agentic AI, CTV, eCommerce, social, and mobile can do to deliver unique ad experiences across the world’s most premium platforms. Taking a Creative Science approach to all we do, we continuously innovate solutions that outperform industry benchmarks and client expectations. Kargo is growing rapidly and currently has offices in NYC, Chicago, LA, Dallas, Sydney, Auckland, London and Waterford, Ireland.
Who We Hire
Techies who want to build the future. Creatives who want to design it better. Communicators to win business. Collaborators to build it. Data pros who turn numbers into insights. Product builders who turn ideas into innovations. Anyone eager to be on a team that doesn’t stop to ask what’s next, because they’re already building it.
The Opportunity
Kargo is hiring a Senior Software Engineer to join our multidisciplinary in-app ad delivery team, spanning client-side and server-side engineering across multiple technology stacks, frameworks, and languages. This role will help lead the In-App team in delivering net-new integrations that maximize in-app revenue at Kargo—working on systems that handle billions of ad requests and help clients deliver and make informed decisions from millions of ads.
The Daily To-Do
- Take ownership of key In-App initiatives and ship against the product roadmap, driving in-app projects on the team and across Kargo
- Launch net-new in-app integrations to maximize in-app revenue, iterating and innovating on in-app ad delivery, measurement, and management across a variety of technology stacks
- Establish stable, dedicated engineering ownership for In-App ad delivery—building redundancy and technical depth so development, maintenance, and production support have sustainable coverage
- Improve the reliability and maintainability of In-App and video ad delivery, quickly identifying technical debt, operational risks, and recurring support issues and driving them toward resolution
- Provide dedicated engineering support for Online Video (OLV), ensuring emerging maintenance, feature, and production needs have clear ownership
- Strengthen knowledge sharing and documentation across the stack, making In-App and OLV systems easier for the broader team to support
- Collaborate across the full lifecycle of full-stack development—from ideation to delivery of high-quality, best-in-class capabilities that give our team and customers an edge in the market
Qualifications
- 5+ years of experience in a software engineering role, with experience leading teams and initiatives
- A background developing client- and server-side solutions in ad tech
- Strong command of a major modern programming language (we work with Golang, JavaScript/NodeJS, PHP, and Python, but direct experience with these isn't required)
- Proficiency with AI tools and workflows, plus a solid understanding of the Software Development Life Cycle, including QA and deployment processes
- Comfort working directly with business stakeholders to define, prioritize, and deliver against evolving requirements
- Experience querying large datasets to understand trends, optimize delivery, and troubleshoot issues; comfortable pairing and giving and receiving code reviews
- Experience with cloud technologies (AWS, Apache Airflow, Dockerized Kubernetes environments) is a plus
What We're Proud Of
- AdAge Best Places to Work
- ThinkLA Partner of the Year
- Built In Best Places to Work
- Cynopsis 2025 Top Women in Media - Jeannine Shao Collins
- Martech Breakthrough Awards - Best Overall Adtech Company
- Digiday Media Awards Best Event
- Cynopsis Media Impact Awards-Best CTV Platform
- Martech Breakthrough Awards-CTV Innovation
- Adweek Media Plan of the Year Awards - Best Use of Insights
Following Our Lead
- Big Picture: kargo.com
- The Latest: Instagram (@kargo.hq) and LinkedIn (Kargo)