Senior Infrastructure Engineer at Rational Dynamics

THE COMPANY Rational Dynamics builds customized AI reasoning systems for tasks of high cognitive complexity. Our initial market is the world’s leading institutional asset owners. We work very closely with these customers to create specialized, rigorous benchmark datasets encompassing their most valuable and difficult knowledge work. Then we use the benchmarks to construct agentic large reasoning models, applying the same rigor to prove that the models correctly do the work. Customers access the models through a tailored application service, making their most skilled, expensive workers dramatically more productive. We are an early-stage startup. Our founders previously started Voleon, now one of the world’s largest systematic investment managers, and recognized as a longstanding industry leader in applied machine learning. They bring to Rational Dynamics the same research discipline and data-driven focus that succeeded in the unforgiving, high-stakes setting of financial markets. JOB OPPORTUNITIES We are looking for entrepreneurial researchers and engineers who want to work on cutting-edge agentic AI methods and build out a best-in-class core technical infrastructure. Our work environment is highly collaborative. Your colleagues will be accomplished experts in AI/ML, statistics, and systems engineering. JOB DESCRIPTION As a Senior Infrastructure Engineer, you will design and build cloud infrastructure that powers Rational Dynamics' AI platform and customer deployments. Reporting to the Director of Software Engineering, you will join a small, fast-moving team. Your job is to build high impact systems to accelerate our systems that accelerate research and customer deployments across domains including model training, data acquisition and curation, cloud orchestration, and security. You will also flex beyond pure infrastructure when the situation calls for it, supporting research iteration, customer deployments, and security needs as they arise. This role is a means to make a difference: the infrastructure you build and maintain will determine whether Rational Dynamics can deliver high cognitive complexity systems that enterprises trust to drive their most critical workflows. We are building a team of people motivated by the future of speed and productivity that will be unlocked that agentic AI will unlock high complexity domains. DUTIES - Own, extend, and improve cloud infrastructure that powers both production customer systems and internal research platforms, including compute, networking, storage, and deployment environments - Build and maintain CI/CD pipelines, developer tooling, and observability that keep the team shipping fast and catching problems early - Support GPU workloads and ML infrastructure needs in close collaboration with the research & ML team - Drive security posture and compliance efforts, including standards relevant to enterprise customers such as SOC 2 - Build deployment and operations infrastructure that enables Forward Deployed Engineers to reliably build solutions quickly in heterogeneous enterprise cloud environments - Make pragmatic, well-reasoned infrastructure decisions that balance speed now with scalability later - Continuously improve system reliability, deployment simplicity, uptime, and cost efficiency through monitoring, feedback loops, and disciplined engineering REQUIREMENTS - Proven experience designing and deploying reliable production infrastructure - 5+ years of experience designing and operating cloud infrastructure in production across multiple cloud providers (AWS, GCP, Azure) - Strong command of Kubernetes, Terraform, and modern CI/CD tooling - Security-conscious mindset with experience navigating enterprise compliance requirements such as SOC 2 or equivalent - Strong programming skills, with experience building infrastructure tooling in Go or an equivalent systems language - Familiarity with data pipeline tooling for batch and long-running workflows (e.g. Airflow, Temporal, etc.) - Comfort operating on a small team with dynamic requirements, threading the needle of speed and scalability, willing to take any task critical to customers and the team PREFERRED QUALIFICATIONS - Prior experience in a regulated or high-consequence industry such as finance, healthcare, or defense strongly preferred - Experience supporting GPU or ML-specific infrastructure workloads - Experience deploying solutions in enterprise customer cloud environments - Experience building infrastructure for the training and deployment of AI agents - Prior early-stage or small-team experience where you made critical end-to-end infrastructure decisions “FRIENDS OF RATIONAL DYNAMICS” CANDIDATE REFERRAL PROGRAM If you have a great candidate in mind for this role and would like to have the potential to earn $7,500 to $15,000 if your referred candidate is successfully hired and employed by Rational Dynamics, please use this form [Upgrade to PRO to see link] submit your referral. For more details regarding eligibility, terms and conditions please make sure to review the Rational Dynamics Referral Bonus Program [Upgrade to PRO to see link] EQUAL OPPORTUNITY EMPLOYER Rational Dynamics is an Equal Opportunity employer. Applicants are considered without regard to race, color, religion, creed, national origin, age, sex, gender, marital status, sexual orientation and identity, genetic information, veteran status, citizenship, or any other factors prohibited by local, state, or federal law.