Applied AI/ML Engineer

Boundless is coordinating GPU compute at scale and building toward becoming a leader in AI. As an Applied AI/ML Engineer, you'll ship AI-powered products end-to-end on top of our growing GPU inference fleet — owning everything from serving low-latency inference to standing up reinforcement-learning post-training pipelines. This is a builder's role: you take an idea from prototype to production, tune it for throughput and cost on real GPUs, and iterate fast on customer and internal feedback.

You should be comfortable operating with a high degree of autonomy, navigating ambiguity, and defaulting to a strong bias for action.

What You'll Do

End-to-End AI Product Delivery: Own AI features and products from prototype through production — model selection, serving, evaluation, and iteration — shipping working software rather than research artifacts.

Inference Serving: Deploy and optimize LLM inference across the fleet using vLLM and SGLang. Tune continuous batching, KV-cache management, quantization, speculative decoding, and multi-model routing to maximize throughput and minimize latency and cost per token.

RL & Post-Training Harnesses: Build and operate reinforcement-learning and post-training pipelines using slime (Megatron-LM + SGLang) and Prime Intellect (prime-rl + the Environments Hub / verifiers). This includes reward and verifier design, rollout orchestration, weight synchronization, and keeping long-running training stable.

Evaluation & Iteration: Build eval harnesses and benchmarks that measure quality, throughput, and cost together, and use them to drive fast, data-informed iteration.

Work Across the Stack: Partner with Infrastructure on GPU scheduling and fleet utilization, and with Product on what to build next and why.

Requirements

• 3+ years shipping ML/AI systems to production
• Hands-on experience serving LLM inference with vLLM, SGLang, or TensorRT-LLM
• Experience with RL / post-training methods (GRPO, PPO, DPO, or SFT), or strong adjacent experience and a clear desire to go deep here
• Strong Python and PyTorch
• Working understanding of GPU execution: batching, memory, and basic CUDA concepts
• Comfort operating in ambiguity with a strong bias for action

Nice to Have

• Direct experience with slime, prime-rl, the verifiers library, or Megatron-LM
• Distributed training experience (FSDP, TP/PP/DP parallelism)