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Senior Software Engineer, Agentic Ads Experience

Reddit· Ads Product & Engineering
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Remote$190.8k - $267.1kFull-timePosted 4mo ago

About the role

Senior Software Engineer on Reddit's Agentic Ads Experience team, building AI-powered advertiser-facing interfaces and agentic systems to reshape Reddit Ads Platform with generative AI capabilities. Role involves end-to-end feature ownership, architectural decisions for AI usage, and collaboration across product, design, data science, and platform teams to ship reliable, trusted AI features for advertisers.

Responsibilities

  • Product Execution: Design and ship advertiser-facing AI features and platform end-to-end, from prototype to GA.
  • Agentic Systems Design: Make architectural calls on how to use generative AI (single-shot LLM calls, workflows, skills, retrieval, agent loops, human review, or no AI).
  • Reliability and Guardrails: Build for AI failure modes including structured outputs, tool boundaries, retries, cost controls, tracing, evals, and human-in-the-loop where relevant.
  • Measurement: Define offline and online evals, instrument traces, run A/B tests, connect model and product metrics to advertiser/business outcomes.
  • Safety and Trust: Design for data isolation, permissioning, auditability, and policy compliance when AI acts on behalf of advertisers.
  • Collaboration: Partner with PM, Design, Data Science, ML Platform, Trust, sales/ops; expose services to platform’s centralized agents.
  • Craft and Communication: Write design docs and communicate trade-offs to non-engineers; promote shipping gen AI features.

Qualifications

  • 5+ years of experience as a software engineer, with a track record of shipping and operating production systems.
  • Hands-on experience building generative AI applications: structured outputs, function/tool calling, prompt and context design, RAG, model routing, and handling model failure modes.
  • Genuine enthusiasm for agents and LLMs; strong opinions on tools and the ecosystem.
  • Strong systems fundamentals: APIs, distributed systems, queues, data stores, service ownership, auth, idempotency, retries, observability.
  • Experience defining evals and measurement for AI systems — offline datasets, online metrics, and knowing when/how to measure a launch quality bar.
  • Fluent with AI coding tools and code-assistant workflows as part of day-to-day engineering practice.
  • Excellent communication skills; able to collaborate remotely and explain AI system trade-offs to technical and non-technical audiences.
  • Extensive software development experience in Python, Golang, Rust, Java, JavaScript, etc.

Skills

Required:Generative AI / AI-powered product experiencesSystem design for AI/LLM integrationsSoftware engineering fundamentals

Benefits

  • Comprehensive Healthcare Benefits and Income Replacement Programs
  • 401k Match
  • Family Planning Support
  • Gender-Affirming Care
  • Mental Health & Coaching Benefits
  • Flexible Vacation & Reddit Global Days Off
  • Generous paid Parental Leave
  • Paid Volunteer time off
Last updated Oct 7, 2026. Interested? Apply on the company site.
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