Mechanical Engineer
TradeJobsWorkForce94141 San Francisco, CA, USFull-time
Mechanical Engineer Job Duties: Designs mechanical and electromechanical products and systems by develop... Show more
Harness Engineer [33250]Stealth Startup • Menlo Park, CA, United States
Harness Engineer [33250]
Stealth Startup • Menlo Park, CA, United States
30+ days ago
Job type
- Full-time
Job description
We’re turning frontier model capability into a genuinely usable desktop agent product. Beyond the model itself, every system capability that lets the agent understand tasks, organize context, call tools, modify code, record its process, roll back state, and form training feedback belongs to the Harness. You’ll join the Harness team to work on the core of our desktop agent product, landing model capability inside real software-development workflows. Responsibilities Work on core Harness R&D, including the desktop workbench, agent loop, tool calling, context management, plugins/MCP/skills, trace, rollback, and training feedback. Own the design, implementation, testing, and iteration of React / Electron / Python / engineering-infrastructure modules. Design and improve the agent’s code-change pipeline—Git control, diff/patch, staging, branch/worktree, change tracking, conflict handling, rollback, and restore. Collaborate with researchers to analyze the agent’s successes and failures on real tasks, driving the Harness and model capability to evolve together. Dogfood the product on real internal development tasks, continuously surfacing and resolving usability, reliability, and developer-experience issues. Contribute to technical architecture, engineering quality, product experience, and project execution. Qualifications 2+ years of software development experience (flexible for exceptional candidates). Bachelor’s degree or above from a strong university. Solid engineering ability, with deep proficiency in at least one of the following: Frontend. React, TypeScript, state management, complex interactions, desktop UI engineering. Desktop. Electron, main/renderer process communication, local file system, process management, cross-platform desktop apps. Backend. Python, async/process models, tool systems, server-side architecture, testing, and engineering practices. Not all four areas required—but you must be able to independently own one core area and read and collaborate on another. Heavy hands‑on use of AI agent tools for real software development, with intensive experience using agent products. Understanding of LLM/agent fundamentals: LLM APIs, context window, agent loop, tool use, reasoning, planning, MCP, memory, subagents, etc. Good engineering habits—valuing maintainability, testing, observability, safety boundaries, and long‑term evolution cost. Nice-to-haves Capability across multiple of React / Electron / Python / engineering at once. Familiarity with Git internals—object store, index, refs, worktree, patch apply, merge conflict, reflog—or experience building Git-based snapshot, rollback, audit, or sync systems. Experience with AI agents, code assistants, IDEs, developer tools, LLM applications, or automated testing/evaluation platforms. Heavy use of Claude Code, Codex, Cursor, Windsurf, Devin, OpenAI Agents SDK, LangGraph, the MCP ecosystem, or similar products/frameworks. Experience with plugin systems, MCP, LSP, sandboxes, terminal orchestration, trace/replay, workflow engines, or evaluation systems. Personal open‑source work, open‑source contributions, research experience, competition awards, or publications. Able to communicate in English with open‑source or user communities. What We Value We value solid software‑engineering ability first. The Harness is complex, but it ultimately comes down to React, Electron, Python, tool systems, file systems, processes, state, testing, Git control, and user experience. The ideal candidate need not know everything, but must be strong in at least one engineering direction and have real interest in and judgment about agent products. #J-18808-Ljbffr
Create a job alert for this search
Harness Engineer [33250] • Menlo Park, CA, United States
Similar jobs
Managing Fire Protection Engineer (MS/PhD)
ExponentMenlo Park, CA, United StatesFull-time
Managing Fire Protection Engineer.Exponent is currently seeking a Managing Fire Protection Engineer for our Thermal Sciences Practice in Atlanta, GA; Chicago, IL; Warrenville, IL; Menlo Park, CA; L... Show more
Mgr Maintenance Eng
Sage HospitalitySan Francisco, CA, United StatesFull-time
The YOTEL San Francisco is seeking an Engineering Manager to join our team in serving guests with creativity and passion!.Work where you belong! Set in one of the most historic buildings in the cit... Show more
Hybrid-Remote Hardware Engineer for Fire-Detection AI
Pano AI, Inc.San Francisco, CA, United StatesRemote
Full-time
A cutting-edge technology company based in San Francisco is seeking a Hardware Engineer to develop mechanical components and support electrical testing for their innovative wildfire detection produ... Show more
Foundry Applications Engineer
StmicroelectronicsSan Francisco, CA, United StatesFull-time
Technical Program Manager, RF & Silicon Photonics.At STMicroelectronics, we believe in the power of technology to drive innovation and make a positive impact on people, businesses, and society.As a... Show more
GTM ENGINEER
Career LaunchSan Francisco, CA, USARemote
Full-time
Quick Apply
Career Launch is hiring for this role and related opportunities.We review candidate profiles across active roles and use resumes/profiles to understand which backgrounds may be a fit.As a GTM ENGIN... Show more
Power Engineer
ACL DigitalSan Francisco, CA, United StatesFull-time
Job Title - Power EngineerLocation - Bay Area, CA (Onsite)Contract Duration - 1 year.Work closely with the Design, DV, Implementation team to define low power vectors, generate early and signoff po... Show more
Staff Portables and Power Quality Engineer
OuraSan Francisco, CA, United StatesFull-time
Senior Product Quality Manager.Our mission at Oura is to empower every person to own their inner potential.Our award-winning products help our global community gain a deeper knowledge of their read... Show more
Rotational Project Engineer
Layton ConstructionSan Francisco, CA, United StatesFull-time
Major Duties and Responsibilities:.Take direction from and support the Project Manager and/or Superintendent on assigned project tasks.Take direction from and support senior team members on estimat... Show more
Android Engineer: Fintech, Kotlin & Scale
RobinhoodMenlo Park, CA, United StatesFull-time
A financial technology company in Menlo Park is looking for an Android Engineer to join a high-performing team.You will build innovative mobile applications using Kotlin, drive features from incept... Show more
GTM Engineer
Higgsfield AISan Francisco, CA, United StatesFull-time
Higgsfield Ai is the fastest-scaling generative Ai company in history, hitting $500M in annual revenue run rate, 25M+ users worldwide, 6M+ generations per day, and powering 390 of Fortune 500 brand... Show more
Mechanical Engineer - Serviceability
ManpowerGroupSan Mateo, CA, United StatesFull-time
Our client, a leading organization in the automotive and transportation industry, is seeking a Mechanical Engineer to join their team.As a Mechanical Engineer, you will be part of the Service Engin... Show more
Remote Senior Networking Engineer - Edge Mesh & Rust
DittoSan Francisco, CA, United StatesRemote
Full-time
A pioneering tech company in San Francisco is looking for a Software Engineer specializing in Networking.This role involves designing and implementing core networking components under real-world co... Show more
GTM Engineer
RelaceSan Francisco, CA, United StatesFull-time
As a GTM Engineer, you'll bridge the gap between growth strategy and technical execution.You will design, build, and optimize the systems and campaigns that fuel acquisition and engagement.Reportin... Show more
Software Engineer, Agentic Products
Flux DefunctSan Francisco, CA, United StatesFull-time
Why FluxFlux is taking the hard out of hardware, by developing the first AI Hardware Engineer.Our goal is to democratize the ability to create bleeding edge hardware, and revolutionize how electron... Show more
Nuclear Engineer
US NavyDavenport, CA, USFull-time
Nuclear Engineer (Naval Reactors Engineer).Design, regulate, and oversee the Navy’s nuclear propulsion program, including reactor design, fleet operations, and eventual defueling and decommissionin... Show more
Space Hardware Production Quality Engineer — Equity
Astranis Space TechnologiesSan Francisco, CA, United StatesFull-time
A cutting-edge satellite manufacturing firm in San Francisco seeks a Production Quality Engineer to ensure high-reliability hardware for satellites.The successful candidate will work closely with e... Show more
Senior Mechanical Design Engineer — Hardware for Waste Reduction
Epoch BiodesignSan Bruno, CA, United StatesFull-time
A leading environmental technology firm in San Bruno is seeking a Mechanical Product Designer to join its Product Design Engineering team.This role involves designing mechanical systems in collabor... Show more
){kind=logo}
GTM Engineer
Bluejay (yc X25)San Francisco, CA, United StatesFull-time
Bluejay is building the simulation, evaluation, and observability layer for voice + text AI agents.We work with Fortune 500s, multinational corporations, and high-growth startups to ensure their AI... Show more
Applications Engineer
Alembic TechnologiesSan Francisco, CA, United StatesFull-time
Applications EngineerAlembic is pioneering a revolution in marketing, proving the true ROI of marketing activities.The Alembic Marketing Intelligence Platform applies sophisticated algorithms and A... Show more