2,917 Founding Engineer jobs
Founding engineer roles building the first product at early-stage startups.
Software Engineer – Logistics AI
Full-stack engineer at a seed-stage San Francisco AI startup building the core product behind AI agents for global logistics (freight forwarders, customs brokers, warehouses, carriers). You own features end to end in Python, TypeScript/Next.js and Node, from UI to data pipelines, on-site five days a week.
Founding Engineer – Agent Infra
Join a seed-stage San Francisco startup (as its third engineer) that runs real AI coding-agent sessions at scale so developer-tool companies can see how agents use their products. You'll own the core backend — sandboxes, AI gateway, orchestration — using AWS, containers, Postgres/ClickHouse, TypeScript/Python, working on-site 9-9-6 for $200k–$250k plus 0.5–1% equity.
Agent Systems Engineer – AI Model Routing
Own the full lifecycle of production AI agents and a multi-model router at a seed-stage San Francisco startup: agent execution, memory, tool use, integrations, infrastructure, and reliability via evals and observability. Requires 1+ year with AI/agent systems, on-site SF 9-9-6, and travel to customers worldwide.
Founding Member of Technical Staff, Research
Founding research engineer who builds and fine-tunes AI agents that run full market-research studies and simulate people and markets, using ML, statistics, and behavioral science. Day to day: fine-tuning models and designing the RL environments, datasets, and evals that train and test autonomous research agents.
X-Technical Founder, Founding Engineer
Founding-level senior engineer at Motion, an AI-native platform that helps performance marketers and creative teams analyze ad creative and ship winning ads across YouTube, LinkedIn, Meta, and TikTok. You'll ship AI-powered features end to end on a stack of React, Node.js/TypeScript, GraphQL, PostgreSQL, MongoDB, and Azure, owning outcomes on a small, high-ownership team.
Sr/Staff Software Engineer
Senior/Staff full-stack engineer at an AI-native startup (Runneth) building a platform that helps performance marketers and creative teams uncover and ship winning ads. You design and ship AI-powered features end to end, plus the APIs and services behind them, using React, Node.js, TypeScript, GraphQL, PostgreSQL, MongoDB, and Azure.
Senior Principal Rack System Integration Engineer
A senior hands-on hardware role integrating SambaNova's AI accelerators into rack-scale systems — racking/stacking network, power, and compute gear, prototyping rack designs, and taking them to mass production and customer datacenter deployments. Core work centers on datacenter equipment (switches, power, fiber/copper networking, air/liquid cooling) and cross-team/vendor coordination.
Quantitative Software Developer
Build and maintain data pipelines and tools to support statistical arbitrage trading strategies in equities, futures, and FX using Python, SQL, and Linux.
Ground Software Engineering Internship (Spring or Summer 2027)
A 12-week on-site internship in Los Angeles with Apex, a satellite bus manufacturer, where you'll be a fully integrated member of the engineering team designing, developing, and deploying ground software that operates spacecraft — owning a scoped project plus tickets across the stack (Rust/C/C++ backend, Vue/React frontend).
Software Engineering Internship, Test & Automation (Summer 2027)
12-week summer 2027 internship at Apex, a satellite-bus manufacturer in Los Angeles. The intern owns a test & automation software project spanning Ground Support Equipment to Flight Hardware, covering design, analysis, build, and testing. Core skills are Python and software architecture; open to BS/MS students graduating Fall 2027/Spring 2028.
Software Engineer, Evals
Builds and maintains AI evaluation systems to measure model capabilities, behaviors, and failures for xAI’s frontier research, using software engineering best practices.
Java Software Engineer (Power/Gas)
Build and maintain a full Java-based tech stack for power and gas trading, including exchange connectivity, trading systems, and pricing, in a startup-like team backed by a global trading firm.
Engineering Manager
Remote (Canada) Engineering Manager at Tailscale overseeing 2-3 cross-functional pods of engineers building its secure mesh networking (VPN) product. Manages, mentors, and hires engineers while providing technical direction; requires prior people-management experience, production service operations, and Go development.
Senior System Engineer
Senior System Engineer at a defense-tech startup who owns entire product lines end-to-end — from customer requirements through architecture, development, deployment, and field support of real-time battlefield intelligence platforms. Day to day involves system architecture, hardware/software integration, and working hands-on with dev teams using OS, networking, and cloud/container (AWS, Azure, Kube
Software Engineer, Data Center - Memphis
Builds and maintains internal software systems for AI data centers, including repair trackers, dashboards, and integrations with ticketing and telemetry tools.
OT Systems Engineer, Physical Infrastructure - Memphis
The OT Systems Engineer designs, deploys, and supports the operational technology (OT) backend — BMS, EPMS, SCADA, and PLC controls — powering xAI's hyperscale AI supercomputer campuses and co-located power generation in Memphis/Southaven. Day to day they sustain live cooling, power, and facility control systems while modernizing them with IT tooling like virtualization, GitOps/IaC, and edge compu
Staff Flight Software Engineer
Develops fault-tolerant flight software for artificial-gravity space stations, integrating with avionics hardware and satellite telemetry systems using C++ and embedded Linux.
Staff Software Engineer, AI Tooling
Lead AI platform development for a space-tech startup, designing full-stack AI tools and integrations to support next-gen space station engineering and operations.
Systems Engineer
Designs and verifies systems for Vast’s commercial space stations, ensuring technical requirements are met and driving cross-disciplinary engineering processes in Long Beach.