Platform Engineer Job New York New York USA,Software Development

Location: New York

The Opportunity

Modern Fi is hiring a Senior/Staff Platform & Infrastructure Engineer to join a talented and collaborative team building the foundation of our platform. You’ll work on critical systems from day one, with meaningful ownership and the opportunity to shape the direction of our products and infrastructure.

We believe in hiring top talent and giving you the autonomy to build impactful solutions, while fostering a culture of collaboration and learning. You’ll grow your expertise, work on mission‑critical systems, and contribute to products that help banks and credit unions better serve their communities, improving financial health nationwide.

This is a founding Platform Engineering role, and you'll have the opportunity to define how we run our infrastructure, release software, and approach security as we scale from serving hundreds of institutions to thousands.

Responsibilities

Own and evolve the reliability posture of the Modern Fi network (observability, incident response, SLOs, and on‑call practices) so we can keep shipping fast without ever compromising correctness.

Lead the buildout of a more advanced release pipeline with merge queues, feature‑flag tooling, and per‑domain release gates for our highest‑stakes services across multiple environments.

Take ownership of our cloud platform, Pulumi modules, AWS account structure, identity, networking, and the tooling product engineers build on, and make the right call between extending what we have today and replacing it for what’s next.

Drive our security and compliance posture:
Vanta remediation, SOC 1/2 readiness, vulnerability scanning, secrets and key management, and hardening across the stack — partnering closely with our CCO, external advisors, and the rest of engineering.

Upgrade how Modern Fi does on‑call: the tooling around it, the runbooks behind it, the rotations that staff it, and the postmortems that close it out while participating in the infrastructure on‑call rotation yourself.

Partner closely with our product engineering pods to understand where the platform creates drag, and ship the abstractions that let them move faster and more safely.

Cultivate a culture of operational excellence through code reviews, design discussions, mentorship, and the steady raising of our collective bar for what production‑grade looks like.

Tech Stack:

AWS / Pulumi IaC
PostgreSQL (RDS), ECS, Docker
Temporal
Python (FastAPI, SQL Alchemy)
Datadog, Pager Duty, Git Hub Actions
Auth0, Vanta, Fern

About You

5+ years of software engineering experience, with significant time spent on infrastructure, platform, or reliability‑focused work in a production environment.
Deep fluency with cloud infrastructure (ideally AWS), infrastructure‑as‑code (Pulumi, Terraform, or similar), and modern CI/CD pipelines.
A security mindset: you treat security as a first‑class concern in everything you build, even if you don't come from a dedicated security background. Familiarity with frameworks such as SOC 2, compliance tooling such as Vanta, and concepts such as secrets management, key rotation, and least‑privilege access is a plus.
Hands‑on experience with a modern observability stack (Datadog, Prometheus + Grafana, the Elastic stack, or equivalent), and a track record of setting observability and monitoring standards that translate into actionable insights for product teams downstream. You've also defined SLOs, run postmortems, and improved the on‑call experiences you've personally experienced.
Comfortable owning systems end‑to‑end, from the IaC that provisions them to the runbooks that recover them.
Experience working in or alongside small, fast‑moving engineering teams, with a track record of making them faster and more reliable rather than introducing process drag.
Excellent…