# Senior GenAI Software Engineer

**Company:** [Liftoff](https://hotfix.jobs/companies/liftoff)
**Location:** Remote
**Role:** ML Engineering
**Salary:** $165k – $230k/yr
**Experience:** 5+ years
**Skills:** Python, JavaScript, TypeScript, LLMs, Multimodal Ai, Image Generation Models, Video Generation Models, System Design, A/B Testing, HTML
**Posted:** 2026-06-05

> Senior engineer building and shipping production-grade GenAI systems for ad creative generation, including multimodal models and interactive playables. Requires 5+ years experience, strong Python/JS skills, and proven LLM production experience.

## Job Description

## What You'll Do

- Architect and ship AI systems that generate ad creatives end-to-end - including interactive playables - combining code generation, multimodal asset generation, and runtime quality into production-grade pipelines
- Rapidly prototype against real creative problems, then take what works from proof-of-concept to production at speed
- Partner closely with creative strategists, content leads, and builders to translate craft expertise into systems that scale
- Design robust systems that handle the inherent variability of AI-generated output through thoughtful guardrails, fallbacks, and quality gates
- Build evaluation infrastructure tailored to creative output, spanning subjective quality assessment, human-in-the-loop review, and A/B testing against real ad performance
- Drive innovation by researching new model capabilities and proposing new initiatives as the frontier moves
- Mentor the team and raise the bar on engineering practices, fostering an environment of open feedback and shared learning

## Who You Are

- Minimum Bachelors Degree and 5yrs of relevant experience
- Senior engineer with significant pre-LLM production experience and solid fundamentals in system design, debugging, and observability
- Strong in Python for AI/agent work and fluent in JavaScript/TypeScript for creative and playables work; HTML and gaming experience a plus
- Has shipped LLM-powered systems to production, learned the failure modes firsthand, and makes deliberate choices about what the model handles versus what belongs in code, tools, or context
- Treats evals as first-class infrastructure and brings hands-on production experience with multimodal AI, specifically image and/or video generation models, with battle-tested intuition for where they excel and where they break
- Clear communicator who collaborates well across teams and disciplines, navigating ambiguity and adapting as priorities shift

## Compensation

- SF Bay Area/Los Angeles/Orange County/Seattle: $180,000 - $230,000
- All other U.S approved states: $165,000 - $211,000

## Benefits

- Full compensation package that includes equity and health/vision/dental benefits associated with your country of residence

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**Canonical:** https://hotfix.jobs/jobs/9ae4d14f-3a6a-4a56-95dd-90b1acfe9fdc