Member of Technical Staff, Platform Engineer
AI summary of the role
Arca is a Series A AI-native wealth management firm rebuilding the industry from the inside.
What you’ll do
- Own core infrastructure and backend systems—services, data stores, and APIs designed for heavy, constant use by non-human agents.
- Build safe execution environments for agents, including sandboxes with versioned SDKs, scoped permissions, rate limits, and isolation.
- Develop developer experience and internal tooling (build, test, deploy, observability) to maximize engineering leverage.
- Ensure performance and cost efficiency of agent systems under real load, scaling across four or five acquisitions this year.
What you’ll bring
- Strong systems thinking and end-to-end ownership of the stack.
- Experience building and operating backend systems and infrastructure in high-stakes or regulated environments.
- Ability to design for reliability, performance, and cost at scale.
- Comfort with ambiguity and a small, fast-moving team.
Technologies
infrastructure · backend systems · APIs · data stores · sandboxing · SDKs · observability · CI/CD · data warehouses · pipelines
Source and classification
Internal deployment & tooling · Evidence for this classification:
of Vanguard, Former CFO of Schwab, Founder of Altruist, Morgan Housel (author of The Psychology of Money) The team We’re small on purpose. We’re a team of 12 based out of NYC and we’re engineering heavy with 8 engineers. We hail from high growth startups like Stripe, Ramp, Rippling, Plaid, Doordash, & Glean. We’re fully in-office in Flatiron, five days a week—lunch together, coffee breaks, basketball games, happy hours. The role As a Member of Technical Staff focused on Platform, you'll own the foundation everything else runs on. The infrastructure, backend systems, and developer experience that let a 12-person team ship agents into a regulated, high-stakes domain without slowing down. One framing we keep coming back to: agents are the primary users of our system of record, and they operate at scale, across every client, all the time. That puts unusual demands on the platform
More from the job description
About Arca Arca is a wealth management firm built from the ground up with AI. Most people get financial advice that's reactive: an annual check-in, a plan that's a document instead of a living thing, a relationship where you're one of three hundred clients your advisor is trying to remember. We think that's backwards. The kind of service that used to require a team of specialists behind you, the kind that makes you feel like the only person in the room, should be available to far more than the ultra-wealthy. So we're building it. We're not SaaS — we are the wealth management business, rebuilding it from the inside with AI. Our platform is an Iron Man suit for advisors: it takes over the low-leverage work so they can focus on what actually requires a human, showing up with empathy, context, and judgment. Underneath, it keeps a living understanding of each client. It remembers the thing you mentioned once, six months ago. It notices when your life changes — a new job, a new kid, a market shift — and adjusts before you think to ask. You won't see the technology. You'll just notice your advisor seems to know you better than any financial professional ever has. That's the product we're growing: client by client, on the strength of the experience itself. We started by acquiring firms managing over $1B in client assets, which gave us real advisors, real clients, and real financial [... source excerpt omitted ...] . We’re fully in-office in Flatiron, five days a week—lunch together, coffee breaks, basketball games, happy hours. The role As a Member of Technical Staff focused on Platform, you'll own the foundation everything else runs on. The infrastructure, backend systems, and developer experience that let a 12-person team ship agents into a regulated, high-stakes domain without slowing down. One framing we keep coming back to: agents are the primary users of our system of record, and they operate at scale, across every client, all the time. That puts unusual demands on the platform underneath — reliability, cost, and performance aren't afterthoughts, they're the product. If you buil [... source excerpt omitted ...] vely working on versions of all of these. A sandbox where agents can safely write and run code. Our agents don't just call APIs—they write and execute code and take real actions. You'll build the sandbox that makes this safe: how we deploy it, how we version the SDKs agents write against, and how we give agents access to our backend and databases without letting them do damage—rate limits, scoped permissions, isolation. Get this right and agents can do far more, far more safely. Cloud agents that triage and fix bugs. With eight engineers shipping into a high-stakes domain, engineering time is our scarcest resource. You'll build agents that live in our infrastructure—triaging
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