About Us At Fireworks, we’re building the future of generative AI infrastructure. Our platform delivers the highest-quality models with the fastest and most scalable inference in the industry. We’ve been independently benchmarked as the leader in LLM inference speed and are driving cutting-edge innovation through projects like our own function calling and multimodal models. Fireworks is a Series C company valued at $4 billion and backed by top investors including Benchmark, Sequoia, Lightspeed, Index, and Evantic. We’re an ambitious, collaborative team of builders, founded by veterans of Meta PyTorch and Google Vertex AI.

The Applied Researcher role is designed for engineers who love working across ML, systems, and real-world products, and thrive on working directly with customers to bring advanced models into production.

About The Role As an Applied Researcher, you will sit at the intersection of ML research, systems engineering, and customer-facing problem solving. You’ll work hands-on with customers and customer data to tune, evaluate and deploy models using various techniques such as SFT / DPO / RL, to help customers build competitive models using their unique data tailored to their unique products.

You will be the technical bridge between customer needs, customer data, and our tuning and serving infrastructure, helping shape the future of applied AI.

Minimum Qualifications

• BS/MS in Computer Science, Electrical Engineering, Machine Learning, or a related field, or equivalent practical experience, open to all levels of experiences.
• Strong experience with PyTorch and modern Transformer architectures.
• Solid computer science fundamentals: data structures, algorithms, concurrency, distributed systems, networking.
• Hands-on experience training, fine-tuning, or evaluating machine learning models, preferably LLMs.
• Familiarity with recent developments in the LLM research domain, including model architectures, training methods, and evaluation strategies.

Preferred Qualifications

• Experience working directly with customers to deliver end-to-end modeling solutions, from understanding their data and product requirements to deploying tuned models in production.
• Strong familiarity with evaluation methodologies for LLMs (benchmarks, custom evals, error analysis).
• Proficiency in diagnosing system-wide problems that hinder customers from achieving desirable outcomes.
• Deep understanding of tuning techniques (SFT, DPO, RL) and the underlying mathematical principles.
• Knowledge of infrastructural components that enterprises commonly use, such as databricks, S3/GCS storage, SageMaker, artifact registry etc
• Familiarity with cloud-native tooling (containers, Docker, Kubernetes, or similar).

Why Fireworks AI?

• Solve Hard Problems: Tackle challenges at the forefront of AI infrastructure, from low-latency inference to scalable model serving.
• Build What’s Next: Work with bleeding-edge technology that impacts how businesses and developers harness AI globally.
• Ownership & Impact: Join a fast-growing, passionate team where your work directly shapes the future of AI—no bureaucracy, just results.
• Learn from the Best: Collaborate with world-class engineers and AI researchers who thrive on curiosity and innovation.

Fireworks AI is an equal-opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all innovators.