Senior Full Stack Engineer

Rational Dynamics

Build reliable full stack AI systems within a fast-moving team at Rational Dynamics. Collaborate with machine learning experts in high-stakes environments.

Posted 4/12/2026full-timeBerkeley • California • 🇺🇸 United StatesSenior💰 $180,000 - $240,000 per yearWebsite

Tech Stack

Tools & technologies

Node.jsPythonPyTorchReact

About the role

Key responsibilities & impact

Own, extend, and improve production full stack systems (frontend interfaces, APIs, and backend services): training pipelines, evaluation frameworks, model serving infrastructure, and monitoring. Focus on delivering reliable capability to customers
Optimize application performance, reliability, and user experience with a bias toward correctness in environments where errors are not recoverable
Translate product requirements into production-grade application features that solves real customer problems, as an embedded member of the research & ML team
Design and maintain testing, observability, and monitoring infrastructure across the stack to enable fast, high quality research and deployment to enable Rational Dynamics to move quickly, and deliver a high quality product with confidenceIntegrate third-party model APIs and LLM orchestration frameworks into the platform
Support deployment of full stack features in complex enterprise environments
Continuously improve system performance through disciplined benchmarking and iteration

Requirements

What you’ll need

5+ years of experience building and maintaining full stack applications in production
Track record of shipping full stack applications where reliability and correctness were non-negotiable, not demo-quality or research-only work
Command of modern frontend frameworks (React preferred) and backend development such as PyTorch or JAX
Strong skills in latency and cost optimization at scale, including efficient inference, serving optimization, and resource-aware model deployment
Strong programming skills in a backend language such as Python or Node, along with strong frontend development skills
Comfort operating on a small team with minimal process, high ownership, and significant ambiguity
Demonstrated experience deploying full stack applications in real production environments serving end users or customers.

Benefits

Comp & perks

medical, dental, and vision coverage
life and AD&D insurance
20 days of paid time off
nine sick days
401(k) plan with a company match

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

full stack developmentfrontend frameworksReactbackend developmentPyTorchJAXapplication performance optimizationlatency optimizationresource-aware model deploymentPython

Soft Skills

ownershipadaptabilityproblem-solvingteam collaborationcommunication