Staff Machine Learning Engineer, Ads Creative Effectiveness

Reddit is a community of communities built on shared interests, passion, and trust. It hosts 100,000+ active communities and approximately 130 million daily active unique visitors.

Reddit's Ads Creative Effectiveness team builds GenAI and predictive products that help advertisers ship high-impact campaigns. We are seeking a Staff engineer with in-depth GenAI expertise to build the future of generative products for ad creative, including best-in-class image, video, and copy generators, performance-guided generations, and brand-safe image/video editing pipelines.

• Architect and implement state-of-the-art pipelines for ad creative generation, moving beyond vanilla prompting to build systems capable of product, font, logo, and brand asset preservation using techniques like IP-Adapters and LoRAs.
• Build editing capabilities for smart-crop, inpaint, outpaint, resize, and style-transfer while maintaining brand guidelines.
• Adapt large vision-language models to understand winning ad aesthetics, building feedback loops where ad performance metrics (CTR, CVR) are used to fine-tune generation (RLHF/RLPF for Ads).
• Engineer robust filtering and safety systems to prevent non-compliant, unsafe, or copyright-infringing content.
• Collaborate with Product, Sales, Policy, UX, and sibling Ads ML teams to integrate ACE capabilities into the Ad Manager UI and ad delivery path.
• Embed brand-safety filters, copyright checks, and human-in-the-loop escalation paths.

• Deep ML expertise with tree models, neural nets, ranking, and especially LLM/VLM fine-tuning and RLHF/RLPF for ads.
• Comfort with uplift metrics, variance, minimum detectable effects, and experimentation setups for generative systems.
• Understanding of auction dynamics and advertiser pain points.
• Startup mindset: bias to action, comfort with ambiguity, and scrappiness.
• Ability to distill complex ML trade-offs for executives, product managers, and non-technical stakeholders.
• Prior work on ad creative tooling: headline generators, image generators, pre-test models, editing flows for the advertiser.
• Nice-to-have: experience navigating brand-safety, privacy, or copyright frameworks in generative AI products.

• Comprehensive healthcare benefits and income replacement programs
• 401k with employer match
• Global benefit programs covering workspace, professional development, and caregiving support
• Family planning support and gender-affirming care
• Mental health and coaching benefits
• Flexible vacation and paid volunteer time off
• Generous paid parental leave

Base salary range: $230,000—$322,000 USD. Eligible for equity in the form of restricted stock units, and possibly commission. U.S.-based employees receive medical, dental, and vision insurance, 401(k) with employer match, generous time off, and parental leave.

Apply through the provided Greenhouse link.