Senior Software Engineer, ACE

London, United KingdomOn-site

Responsibilities

Lead Creative Engineering Architecture: Drive the design and implementation of high-performance backends for ad creative generation.
Scale Performance Feedback Systems: Architect the infrastructure that bridges the gap between ad performance (CTR, CVR) and the creative engine.
Optimize Model Orchestration & Efficiency: Solve complex engineering challenges around high-concurrency inference, latency optimization, and cost-efficient scaling at Reddit's global volume.

With 100,000+ active communities and approximately 126 million daily active unique visitors, Reddit is one of the internet’s largest sources of information.
We construct insight and recommendation engines to guide advertisers towards best practices and key enhancements, distilling knowledge about what works at Reddit to supercharge their performance. About the Role:
Advanced Editing & Asset Workflows: Lead the development of end-to-end image and video editing engines.
Cross-Functional Technical Leadership: Partner deeply with Product, UX, and Ads ML leadership to help define the technical roadmap for ACE.
experience architecting and scaling distributed backend systems (e.g., Python, Go).
You have a proven track record of designing robust microservices and APIs that are not only performant but also extensible and easy for others to build upon.
Applied AI/ML Systems Engineering: Strong
experience bridging the gap between ML models and production software.
You understand the nuances of model serving, building resilient data pipelines for LLMs/VLMs, and optimizing the infrastructure required for real-time generative workflows.
Strategic Product Engineering: A deep understanding of how technical decisions impact the business.
Technical Leadership & Influence: Exceptional communication skills with the ability to build consensus across Product, Design, and ML teams.
In select roles and locations, the interviews will be recorded, transcribed and summarized by artificial intelligence (AI).