About this opportunity
Cephable lists this Senior Software Engineer opportunity in wilmington, Massachusetts. Review the employer’s description below for duties, qualifications and application requirements.
Job description
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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Worksite address
wilmington, MA, 01887, US
Who can apply
Review the original listing for work authorization, qualifications and employer requirements.