---
title: 'Senior/Staff Security Engineer at Sandbar'
canonical: 'https://feeny.ai/job/senior-staff-security-engineer-sandbar-new-york-h9s52054vpvr'
type: 'job'
last_seen: '2026-10-19'
---

# Senior/Staff Security Engineer at Sandbar

- **Company:** Sandbar
- **Location:** New York, NY
- **Employment:** full-time
- **Work type:** onsite
- **Posted:** 2026-10-17
- **Last confirmed live:** 2026-10-19
- **Apply:** https://jobs.ashbyhq.com/sandbar/b28da6c0-890c-48bf-8291-2b6a6ab96b7f

## Job description

## About Sandbar

Sandbar is an interface company in New York City. We aim to expand human thinking. Our team has built software, ML, hardware, and consumer products across Meta, CTRL-labs, Apple, Peloton, and Equinox. Our first product is Stream, is private voice ring that extends your thinking. Stream has been featured in WSJ, Bloomberg, Wired, and Time's Best Inventions of the Year. Join us in creating technology that extends human thinking.

## About

We’re looking for a senior or staff backend engineer with deep security expertise to help build Stream, a new conversational interface. Stream is a self extension that people use to expand their own thinking. We believe thoughts belong only to you and must be private. You’ll own the backend systems that make that privacy real: how user data is encrypted, how keys are managed, how services and people authenticate to our infrastructure, and how we detect and respond to problems. You’ll define security at Sandbar, working inside a small backend team on a live production service rather than in a separate security function.

## Responsibilities

- Design and ship end-to-end encryption for user data, including key management and keeping search and background processing working on encrypted data
- Build confidential-computing infrastructure so sensitive processing is isolated and verifiable, including attestation and reproducible builds
- Own identity and secrets across the stack: short-lived workload credentials, least-privilege service identities, environment isolation, and auditable privileged access
- Own supply chain and CI/CD security
- Build the detection and response loop: audit logging, alerting, runbooks, and post-incident reviews that end in engineering changes rather than documents
- Drive vendor and data-handling security: AI provider data agreements, third-party integration and OAuth scope review, and data retention and deletion
- Lead compliance work (e.g. SOC 2) from the engineering side, with controls enforced by systems and evidence produced automatically
- Carry a share of the core backend: build product features on the real-time Python services you secure, and review the team’s changes with a security eye
- Set direction on secure engineering practice through design reviews, threat models, and clear, minimal guidance that engineers actually follow

## Qualifications

- 7+ years building and operating backend systems, with meaningful time as the engineer accountable for security on a production service
- Strong Python and comfort owning a live, real-time service end to end
- Hands-on applied cryptography: envelope encryption, authenticated encryption, key hierarchies, and the practical mistakes that break otherwise-correct designs
- Deep cloud security experience on AWS and/or GCP: IAM, workload identity federation, KMS, secrets management, audit logging
- Experience leading incident response on a production service, from containment through follow-up hardening
- Experience with confidential computing or attestation (e.g. Nitro Enclaves, SEV-SNP, TDX, App Attest) strongly preferred
- Comfortable with document stores and their access-control models
- Able to make tradeoffs explicitly and ship: you know the difference between a control that gates a launch and one that can follow
- Communicate precisely with engineers, founders, auditors, and vendors

## Nice to have

- iOS security primitives (Secure Enclave, Keychain)
- Bluetooth LE device security, firmware signing, or secure pairing
- Experience with retrieval systems or LLM infrastructure and their data-flow controls
- SOC 2 or ISO 27001 audit experience from the engineering side

FTE Benefits

- Health, vision, and dental benefits
- Company-sponsored 401(k)
- Unlimited PTO and sick time
- Early stage equity

## About Sandbar

## Company Overview
- **One-liner**: Sandbar builds a conversational interface called Stream, a physical wearable ring and AI-powered software layer designed to augment thinking and action by allowing users to interact with technology through natural voice conversation while on the move.
- **Entity Type**: Private (Seed & Series A funded)
- **Headquarters**: New York City, United States
- **Founded**: 2023
- **Founders**: Mina Fahmi (CEO) and Kirak Hong (CTO)

## Core Business
- Primary industry/industries: Human-AI interface, Consumer Electronics, Artificial Intelligence
- Target customers: B2C (early adopters, knowledge workers, creators) and B2B elements (developer platform for AI agents)
- Mission or purpose statement: To augment individuals so they can each think, act, and move more freely. The company believes in building a "more human" interface with technology.

## Products & Services
- **[Stream]**: A physical wearable device (a ring) that, when paired with a mobile app and AI backend, creates an ambient, voice-first conversational interface. It is designed to capture thoughts, orchestrate AI agents, and provide context-aware assistance without needing to look at a screen. The device is currently in pre-order, with Batch 3 available after Batches 1 and 2 sold out. It is described as a "self extension that keeps your thinking moving." The company is also building a developer platform (API/agents) for third-party integrations.

## Market Standing
- **Valuation/Market Cap**: Not publicly disclosed.
- **Total Funding**: $36M (based on public announcements: $13M Seed round in November 2025, and a $23M Series A in March 2026).
- **Key Metric**: Total funding raised ($36M), with Stream’s first two pre-order batches selling out completely.
- **Notable Investors/Partners**: Adjacent, Kindred Ventures (co-leads of Series A), True Ventures, Upfront Ventures, Betaworks.
- **Growth Signals**: Rapid headcount growth (+172.7% YoY to 16 employees), significant venture capital backing within 2.5 years of founding, and high consumer demand for its product (sold out pre-order batches). The company is actively hiring across 13 open roles, indicating a major scaling phase.

## Competitive Advantages
- **Full-Stack Vertical Integration**: They control the hardware (ring), firmware, Bluetooth, mobile app, backend, AI models, and retrieval layers. This allows them to optimize for latency and fluency in a way that pure software or pure hardware companies cannot.
- **New Design Primitives**: Sandbar is not replicating a screen interface with voice. They are inventing a new UX paradigm for "conversation" that relies on deep memory, context, and asynchronous action, without the need for a visual display.
- **Agent Orchestration Layer**: Stream is designed to be the persistent, always-on layer that knows a user's context, preferences, and day, enabling it to automatically spin up and orchestrate multiple specialized AI agents without the user needing to manage them manually.

## Strategic Focus
- Product delivery and scaling: The immediate priority is shipping Stream to its first customers in Summer 2026 and fulfilling growing pre-order demand.
- Talent acquisition: The company is aggressively hiring across machine learning, software engineering, hardware, product design, and marketing to build a world-class team to scale the product.
- Platform development: Expanding the developer platform and agent ecosystem to make Stream the "layer that sits underneath all of it" for the emerging agentic world.

## Why Work Here
- **Mission-Driven & Cutting-Edge**: The opportunity to work on a genuinely new computing paradigm—a conversational interface that could fundamentally change how people interact with technology in their daily lives.
- **Talent Density & Pedigree**: The team is small (16 people) but composed of engineers and operators from top-tier companies like Meta, Apple, Peloton, and Equinox, offering a high-velocity, high-impact environment.
- **Full-Stack & Multi-Disciplinary**: Engineers and designers work across a wide stack (hardware, firmware, software, ML, AI) on challenging real-time problems.
- **Culture**: The company describes itself as "small," with a focus on speed, iteration, and craft. The founders are active and visible, sharing the company’s technical philosophy publicly.
- **Location & Flexibility**: The company is headquartered in New York City (HQ) with a presence in Germany. While office presence is implied (hardware development), there is a distributed element to the team. Perks or specific policy (remote/hybrid) are not explicitly stated but are likely high-flexibility given the small team and talent profile.

## Sources
1. [sandbar.com](https://www.sandbar.com/about-us)
2. [sandbar.com](https://www.sandbar.com/careers)
3. [sandbar.com](https://www.sandbar.com/technology)
4. [linkedin.com](https://www.linkedin.com/company/sandbarinc)
5. [jobs.ashbyhq.com](https://jobs.ashbyhq.com/sandbar)

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