Staff AI Engineer

Félix

Remote

Full-time

Staff

8+ yrs

Salary not listedPosted 3w ago

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Real job — pulled straight from Félix’s careers page · Verified July 22, 2026 · No reposts.

Félix is hiring a Staff AI Engineer — a full-time, remote role. Apply directly on Félix's careers page below.

Staff Platform Engineer, AI Agent Infrastructure & Security

Location: Miami, New York, San Francisco, US

Department: Engineering

Location Type: REMOTE

Employment Type: FULL_TIME

About Us

At Félix, we're building the financial ecosystem for Latin immigrants in the U.S., starting with a revolution in remittances. Our core product is an AI-powered chatbot built on WhatsApp, allowing our users to send money home as easily as sending a text message. We leverage cutting-edge technology like AI, blockchain, and stablecoins to make cross-border payments faster, more affordable, and more accessible than ever before.

We are a hyper-growth Series B company, backed by over $100 million in funding from top-tier global investors, including QED, Castle Island, Switch Ventures, HTwenty, Monashees, and General Catalyst Customer Value Fund. This isn't just about the numbers; it's a testament to the trust our investors have in our vision and our team. Additionally, Félix was selected as an “Endeavour Entrepreneur” and was a recipient of the CrossTech Fintech Startups Award. We are a group of extremely talented and dedicated high-performers, united by our shared obsession with a single goal: empowering our customers. We are all owners of Félix, driven by a bias for action and a true experimentation spirit to get shit done with urgency and focus.

Joining Félix means you will be part of a team building a legacy, a company that will outlive us all. This is a rare opportunity to apply your skills to a deeply meaningful mission—serving a community that has been underserved for too long. We are a team that is fiercely loyal to each other, where radical transparency and constructive feedback are how we grow and push for excellence. We are bold, we care less about what others are doing, and more about creating sustainable value and a product that truly makes our users' lives better. We are building the future, today.

About the Role

We're looking for a highly technical Staff Platform Engineer to lead the platform and security foundations of Maestro — Félix's internal, identity-aware AI teammate. Maestro already runs at meaningful scale (500+ per-user pods on private GKE) and lives where work happens: Slack, incident rooms, and an emerging agentic intranet, acting across our toolchain (GitHub, Google Workspace, ClickUp, Notion, PagerDuty, New Relic).

The interesting problems here are not prompts or models. Once an AI teammate can open a pull request, page an engineer, or query production, the hard questions become identity, credentials, isolation, blast radius, and audit. This is a platform and security role for an agentic system — you'll own the secure, multi-tenant runtime that makes delegated AI work safe at scale.

You'll be the technical anchor for Maestro's infrastructure and security within the AI team: architecting the control plane, hardening the runtime, running the fleet, and shaping what the platform needs next as adoption grows. AI is the domain you'll operate in — deep platform and security engineering is the craft we're hiring for.

Responsibilities

Own the Maestro platform architecture. Design, build, and operate the multi-tenant control plane and per-user runtime on private GKE — the Kubernetes operators (CRDs/controller-runtime), Helm charts, gVisor-sandboxed pods, and per-user isolation primitives (KSA/GSA, Workload Identity, NetworkPolicy, per-user workspaces) that reconcile one user into a fully wired, isolated environment.
Lead the security model end to end. Treat the LLM and its tools as adversarial. Own identity separation (requester / actor / persona), JIT short-lived scoped tokens, an encrypted OAuth refresh-token vault (CMEK/Cloud KMS), zero-credential egress patterns, and a policy layer that decides whose credentials an agent uses — never the prompt.
Harden service-to-service trust. Enforce mesh identity with Istio mTLS + SPIFFE, signed request claims (JWS) to prevent confused-deputy issues, and deny-by-exception networking across the fleet (Istio AuthorizationPolicy + Kubernetes NetworkPolicy).
Operate the fleet, not the bot. Build fleet health, scale-to-zero, resource packing, and safe operational tooling for 500+ pods, with the SRE-grade availability, latency, and recovery the platform demands.
Own IaC and delivery. Drive Terraform for the dedicated GCP projects (VPC, private GKE, GPU/gVisor node pools, Cloud SQL, Memorystore, GSM, Artifact Registry), plus CI/CD and progressive delivery for control-plane and runtime components.
Make audit a product feature. Own the OpenTelemetry pipeline (logs/metrics/traces) fanning out to Cloud Logging, BigQuery, and New Relic, capturing gateway, kernel/gVisor syscall, and real-time SecOps events so "who asked, which persona acted, which credentials were used, did the user confirm?" is always answerable.
Enforce human-in-the-loop and guardrails. Build the approval flows for irreversible actions (writes, merges, admin ops) and the read-only, model-immutable guardrail mounts (identity, instructions, curated skills).
Integrate the agent layer, safely. Partner on the OpenClaw gateway, controlled tool wrappers, and model routing (Vertex AI for stakes, self-hosted Ollama for volume) — ensuring every agent capability is a governed capability, not a raw CLI or API key.
Set the technical direction. Define platform and security best practices, mentor senior and mid-level engineers, and map Maestro's next infrastructure needs as it scales.

Requirements

Experience: 8+ years in software/infrastructure engineering, with a proven track record owning large-scale, security-critical distributed systems end to end.
Platform & Kubernetes mastery (Staff bar): Deep, hands-on Kubernetes in production — operators/CRDs and controller-runtime, Helm, runtime isolation (gVisor or equivalent), multi-tenancy, and fleet operations at scale. Strong cloud-native architecture on GCP (or AWS/Azure), and IaC with Terraform.
Security & identity depth (Staff bar): Strong applied security engineering — workload identity (SPIFFE/SPIRE, Workload Identity Federation), service mesh mTLS (Istio), OAuth 2.0 / OIDC, token exchange, JIT/short-lived scoped credentials, secrets/KMS envelope encryption, least-privilege and zero-trust patterns, and threat modeling for adversarial workloads (confused-deputy, prompt injection, data exfiltration).
Systems & code: Excellent Go and/or Python, with deep system-architecture judgment. Comfortable owning services, operators, and tooling in production.
Observability & LLMOps: Production-grade monitoring, tracing, and audit design (OpenTelemetry), plus SRE fundamentals — SLOs, incident response, cost/performance engineering.
Agentic AI (Senior / domain level): Solid, hands-on experience with production LLM/agent systems — tool-calling, multi-step orchestration, human-in-the-loop, model routing, and eval/guardrail thinking. You understand agentic architectures deeply enough to secure and operate them; you do not need to be a model researcher.
Ownership & leadership: High autonomy in an early-stage squad — independently diagnose bottlenecks, propose architecture, and ship it. Proven ability to grow engineers through architectural guidance, not just code review, and to align technical decisions with stakeholders across Product, Security, and Leadership.

What We Offer

Competitive salary
Initial stock options grant
Annual performance bonus
Health, dental, and vision plans
401(k) with employer match
Continuous learning opportunities
Unlimited PTO
Paid parental leave
Empowering opportunities for growth in a dynamic entrepreneurial environment

What We Offer

Competitive salary
Initial stock options grant
Annual performance bonus
Health, dental, and vision plans
Remote work environment, although we have offices in Miami and México City and would love to work in hybrid model if you are up to it.
Continuous learning opportunities
Unlimited PTO
Paid parental leave
Empowering opportunities for growth in a dynamic entrepreneurial environment

Equal Opportunity Employer

At Félix, we are committed to providing equal employment opportunities to all qualified employees and applicants without regard to race, religion, nationality, sex, sexual orientation, gender identity, age, or disability. This policy applies to all terms and conditions of employment, including recruitment, hiring, placement, promotion, training, compensation, benefits, and termination.

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