Role Summary

The AI Engineer will establish Firmus AI Factory as the foundation for efficient, production-grade distributed training by delivering pre-built training recipes (TorchTitan, Megatron etc.), evaluation benchmarks, and model guidance. You'll work with customers and internal teams to optimize training efficiency, define baselines, and document best practices. Your templates and benchmarks are the anchor point for our hyperscale customers' training workflows and our model arena differentiator.

Key Responsibilities

Build production-ready training recipes using TorchTitan and Megatron-LM: model configs, parallelism strategies (FSDP, tensor/pipeline parallelism), checkpointing patterns.
Document parameter tuning for different scales (e.g., "to train Llama 7B on 8xH100s, use this config and expect X throughput").
Create and validate multi-node NCCL communication patterns on AI Factory K8s/Slurm clusters.
Design and build benchmarking suites: accuracy, latency, throughput (tokens/sec), cost per token, energy efficiency, MFU.
Implement offline evaluation harnesses for standardized model comparison and leaderboard tracking.
Conduct fine-tuning experiments (LoRA, QLoRA) where they improve product outcomes (e.g., ops domain data), document gains.
Create training efficiency playbooks and publish benchmark results so customers can optimize workloads.
Partner with job scheduling and orchestration engineers on template integration and other AI engineers and software engineers on model optimization trade-offs for inferencing and AI applications.

Skills & Experience

5–7 years of experience in distributed machine learning (PyTorch/JAX, FSDP, DeepSpeed, multi-node training at 10+ GPUs).
Expert-level understanding of GPU optimization: utilization, memory patterns, communication bottlenecks (NCCL collectives).
Hands-on distributed training at scale: debugged convergence issues, profiled bottlenecks, optimized throughput.
Strong benchmarking methodology: design-controlled experiments, measure noise, communicate results rigorously.
Familiarity with TorchTitan, Megatron-LM, or similar production training frameworks.
Understanding of model parallelism strategies and trade-offs (FSDP vs. tensor parallelism vs. pipeline parallelism etc.).

Key Competencies

Distributed Systems Mastery: can explain NCCL, collective communications, and scaling inefficiency.
Benchmarking Rigor: doesn't just run benchmarks; validates assumptions, explains variance, communicates uncertainty.
Production Thinking: understands checkpointing, recovery, resource constraints, and cost optimization.
Mentorship: can guide engineers on training best practices and debugging distributed training issues.
Documentation: creates clear, actionable playbooks that customers can follow.

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