Senior AI Engineer

LottieFiles is seeking a Senior AI Engineer to join our team in building advanced AI systems that generate production-quality motion from natural language. You will work at the intersection of LLM systems, post-training, code generation, and data engineering to develop specialized models that produce structured, editable animation with high efficiency.

Key responsibilities

• Design and ship improvements across model orchestration, tool use, structured generation, and visual verification.
• Build compiler-backed feedback loops and deterministic quality gates to ensure high-quality outputs.
• Design supervised fine-tuning datasets and training recipes for direct Motion DSL generation.
• Develop robust evaluation batteries to measure correctness, visual quality, latency, and cost.
• Turn production generations into high-quality training datasets using advanced filtering and versioning.

Requirements

• Proven experience building and operating production-grade AI or machine-learning systems.
• Practical expertise in supervised fine-tuning and modern post-training workflows.
• Strong evaluation instincts with the ability to design automated graders and regression suites.
• Experience with code-generation models, DSLs, parsers, or structured outputs.
• Solid production engineering judgment regarding observability, reliability, and inference cost.

What we offer

• Fully remote working environment with flexible work hours.
• Generous learning budget and support for professional development.
• Comprehensive medical insurance and gym membership.
• Unlimited leave days to support work-life balance.
• Home workstation setup bonus and a welcome swag pack.