Software Engineer, ACE at Reddit

United Kingdom

Reddit is a community of communities. It’s built on shared interests, passion, and trust, and is home to the most open and authentic conversations on the internet. Every day, Reddit users submit, vote, and comment on the topics they care most about. With 100,000+ active communities and approximately 121 million daily active unique visitors, Reddit is one of the internet’s largest sources of information. For more information, visit www.redditinc.com. Location: This role is based in the UK. Don't live near our office? No worries: you can work remotely from anywhere in the UK. About the Team The Ads Creative Effectiveness team is aimed at improving the impact of ad creative at Reddit through generative and predictive products. We adapt and finetune LLMs/VLMs to help advertisers make impactful images, videos, text and more. We build performance predictors to understand and rank ad components, ensuring the advertiser ships the best possible campaigns. 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 Reddit’s newly minted Ads Creative Effectiveness team sits at the heart of our creative strategy, building GenAI and predictive products that help advertisers ship high-impact campaigns. We are searching for a Software Engineer to help us build the future of generative products for ad creative at Reddit - from contributing to the development of best-in-class image, video and copy generators that leverage Reddit’s best practices, performance-guided generations that maximize clicks and conversions, and brand safe, product preserving image/video editing pipelines at scale. Responsibilities: Creative Engineering Pipelines: Architect and implement high-performance backends for ad creative generation. You will build the systems that handle complex workflows like brand asset preservation and style consistency, ensuring seamless integration of GenAI tools into the Reddit ecosystem. Creative Editing Features: Develop end-to-end image and video editing capabilities. You’ll build the logic and APIs that allow advertisers to alter assets while abiding by brand guidelines. Data-Driven Feedback Loops: Build the infrastructure to connect ad performance metrics (CTR, CVR) back into the creative engine. You will engineer the systems that ingest performance data to programmatically improve generation quality and relevance. Scalable Model Orchestration: Design and optimize low-latency serving layers for complex AI models. You will focus on the software engineering challenges of inference: balancing high-concurrency demands with cost-efficiency and rapid response times. Safety & Policy Infrastructure: Engineer robust middleware for content filtering and compliance. You will build the automated safety layers that prevent non-compliant or infringing content from reaching the platform, ensuring a brand-safe experience. Partner Broadly: Collaborate with Product, Sales, Policy, UX, and sibling Ads ML teams to integrate ACE capabilities into the Ad Manager UI and the ad delivery path. Guardrails & Safety: Embed brand-safety filters, copyright checks, and human-in-the-loop escalation paths to protect users and advertisers. Required Qualifications: Strong Software Engineering Fundamentals: Proficiency in building and scaling backend systems (e.g., Python, Go). You have experience with API design, microservices architecture, and writing clean, maintainable, and well-tested code. Practical AI/ML Integration: While you don't need to be a researcher, you should be comfortable working with ML infrastructure. This includes experience integrating LLM/VLM APIs, managing data pipelines, and implementing model serving logic. Product-Minded Engineering: A keen interest in the advertiser experience. You can translate customer pain points into technical requirements and are excited about building tools that directly impact revenue and retention. Startup Mindset: A strong bias for action and the ability to thrive in an ambiguous, fast-paced environment. You are "scrappy" and focused on shipping high-quality code quickly. Effective Collaboration: Excellent communication skills with the ability to explain technical trade-offs to Product Managers, Designers, and other engineers. You are a team player who thrives in a cross-functional environment. Relevant Tooling Experience: Prior experience building or maintaining creative tools—such as asset management systems, image/video processing pipelines, or automated content workflows—is a major plus. Benefits: Global Benefit programs that fit your lifestyle, from workspace to professional development to caregiving support Family Planning Support Gender-Affirming Care Mental Health & Coaching Benefits Group Personal Pension Scheme with Employer match Private Medical and Dental Scheme Income Replacement Programs Bike to Work scheme Flexible Vacation & Paid Volunteer Time Off Generous Paid Parental Leave In select roles and locations, the interviews will be recorded, transcribed and summarized by artificial intelligence (AI). You will have the opportunity to opt out of recording, transcription and summarization prior to any scheduled interviews. During the interview, we will collect the following categories of personal information: Identifiers, Professional and Employment-Related Information, Sensory Information (audio/video recording), and any other categories of personal information you choose to share with us. We will use this information to evaluate your application for employment or an independent contractor role, as applicable. We will not sell your personal information or disclose it to any third party for their marketing purposes. We will delete any recording of your interview promptly after making a hiring decision. For more information about how we will handle your personal information, including our retention of it, please refer to our Candidate Privacy Policy for Potential Employees and Contractors. Reddit is proud to be an equal opportunity employer, and is committed to building a workforce representative of the diverse communities we serve. Reddit is committed to providing reasonable accommodations for qualified individuals with disabilities and disabled veterans in our job application procedures. If, due to a disability, you need an accommodation during the interview process, please let your recruiter know.