Senior Software Engineer

The Opportunity

Cephable is an on-device productivity assistant that helps people control, create, and automate their work across personal and professional workflows. Built on universal-design principles, Cephable adapts to the way each person works best, and it does so privately: everything runs on the device, so a person's and a business's data is never processed in the cloud. We're a small, fast-moving team building category-defining software, and we go to market alongside the world's leading technology partners.

Role Overview

We are seeking a Senior Software Engineer to own and evolve Cephable's React/Electron desktop app. This is a hands-on, high-ownership role for a dynamic engineer who can move fluidly across the app - from UI to architecture to performance - and who wants to grow into deeper native and AI-adjacent work over time.

C++ and on-device AI experience are areas we're actively looking to strengthen on the team. If you have that background, it's a significant plus and an area where you'll have real room to contribute to native modules that bridge our on-device AI systems into the app. If you don't yet have that experience but are eager to grow into it, we still want to hear from you.

Key Responsibilities

Application Development

Design, build, and maintain features across our React/Electron desktop app

Own the architecture and performance of the desktop application codebase

Ensure consistent, accessible, high-quality UX

Native & AI Integration

Contribute to native modules (C++, and Swift/Objective-C or Kotlin/Java as needed) that bridge JavaScript/TypeScript app code with on-device AI and system-level APIs

Work closely with ML engineers to help expose on-device models - including llama.cpp-based inference - to the application in a performant, well-abstracted way

Grow the team's native and AI-adjacent capabilities over time

Technical Leadership

Lead code reviews and help set best practices for cross-platform development

Identify systemic issues - technical debt, process gaps, recurring bugs - and lead efforts to address them at the root

Communicate technical tradeoffs clearly to product, design, and non-technical stakeholders

Mentor other engineers on native module development and cross-platform architecture as the team grows

Required Qualifications

5+ years of professional software engineering experience, with significant time in React and Electron

Strong TypeScript/JavaScript skills and solid understanding of desktop app architecture

Demonstrated versatility - comfortable moving across UI, application architecture, and performance work

Excellent communication skills - able to explain complex technical tradeoffs clearly to engineers and non-technical stakeholders alike

Ability to use tools like claude code, codex, github copilot, etc to manage multiple workstreams at a time

Preferred Qualifications

Hands-on experience writing native modules/bridges, particularly in C++

Experience integrating local LLM inference runtimes into applications

Experience debugging performance issues across the JS-to-native boundary

Experience with React Native and native modules for iOS/Android (Swift/Objective-C, Kotlin/Java)

Experience with on-device AI or ML-powered application features

Familiarity with ONNX Runtime, GGUF model formats, or similar on-device inference tooling

Experience shipping and maintaining desktop apps via Electron

Background in accessibility-focused or assistive technology products

About the Team

You'll be joining a small, highly collaborative engineering team of six, working closely with the the CEO, Director of Engineering, Principal Architect, and our ML engineering function. This role sits at the intersection of application engineering and on-device AI - there's significant ownership available for someone who wants to shape how our apps and models work together.

Why Cephable

Mission-driven impact: Build the interface between people and AI that gives them more control over their digital lives

Deep technical ownership: Own the desktop application layer, with real room to grow into native/AI integration work

Modern, meaningful stack: React, Electron, native modules, and local LLM inference - not just CRUD apps

Small team, high trust: Work directly with senior leadership in a low-bureaucracy environment

Seed-stage momentum: Backed by top investors with enterprise partnerships at scale

What We Offer

Equity

Meaningful equity grants (options) in a company with existing revenue and a clear growth trajectory

Standard 4-year vesting with a 1-year cliff

Health & Wellness

Health insurance - medical, dental, vision

Time Off

120 hours per year accrued per pay period

Up to 40 hours carry over year to year (we want you taking vacation)

8 additional hours per year of tenure

15 paid holidays: 11 federal holidays, plus the Fridays before Labor Day and Memorial Day, an extra day for July 4th, and the Wednesday before and Friday after Thanksgiving

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