Senior Software Engineer at Cephable Senior Software Engineer at Cephable in Wilmington, Massachusetts Posted in 4 days ago.

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full-time The OpportunityCephable 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 OverviewWe 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 ResponsibilitiesApplication DevelopmentDesign, build, and maintain features across our React/Electron desktop appOwn the architecture and performance of the desktop application codebaseEnsure consistent, accessible, high-quality UXNative & AI IntegrationContribute 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 APIsWork closely with ML engineers to help expose on-device models including llama.cpp-based inference to the application in a performant, well-abstracted wayGrow the team's native and AI-adjacent capabilities over timeTechnical LeadershipLead code reviews and help set best practices for cross-platform developmentIdentify systemic issues technical debt, process gaps, recurring bugs and lead efforts to address them at the rootCommunicate technical tradeoffs clearly to product, design, and non-technical stakeholdersMentor other engineers on native module development and cross-platform architecture as the team growsRequired Qualifications5+ years of professional software engineering experience, with significant time in React and ElectronStrong TypeScript/JavaScript skills and solid understanding of desktop app architectureDemonstrated versatility comfortable moving across UI, application architecture, and performance workExcellent communication skills able to explain complex technical tradeoffs clearly to engineers and non-technical stakeholders alikeAbility to use tools like claude code, codex, github copilot, etc to manage multiple workstreams at a timePreferred QualificationsHands-on experience writing native modules/bridges, particularly in C++Experience integrating local LLM inference runtimes into applicationsExperience debugging performance issues across the JS-to-native boundaryExperience with React Native and native modules for iOS/Android (Swift/Objective-C, Kotlin/Java)Experience with on-device AI or ML-powered application featuresFamiliarity with ONNX Runtime, GGUF model formats, or similar on-device inference toolingExperience shipping and maintaining desktop apps via ElectronBackground in accessibility-focused or assistive technology productsAbout the TeamYou'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 CephableMission-driven impact: Build the interface between people and AI that gives them more control over their digital livesDeep technical ownership: Own the desktop application layer, with real room to grow into native/AI integration workModern, meaningful stack: React, Electron, native modules, and local LLM inference not just CRUD appsSmall team, high trust: Work directly with senior leadership in a low-bureaucracy environmentSeed-stage momentum: Backed by top investors with enterprise partnerships at scaleWhat We OfferEquityMeaningful equity grants (options) in a company with existing revenue and a clear growth trajectoryStandard 4-year vesting with a 1-year cliffHealth & WellnessHealth insurance medical, dental, visionTime Off120 hours per year accrued per pay periodUp to 40 hours carry over year to year (we want you taking vacation)8 additional hours per year of tenure15 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 recblid xik08tyw0qdrygh7bk5i82tfcaywk3