2,916 Founding Engineer jobs
Founding engineer roles building the first product at early-stage startups.
Lead AI Native Engineer
Build and scale RoboForce’s internal AI-native operating system, embedding agents and automations across teams to turn AI experiments into company-wide leverage.
Senior Software Engineer (Virginia)
Senior software engineer at a defense-tech autonomy company: leads design of Python APIs and services, geospatial/sensor data pipelines, and agentic AI components, while owning cloud architecture on AWS (GovCloud-aware) with Terraform and GitHub Actions CI/CD. Requires 7+ years' experience and US citizenship.
Systems Engineer
Systems engineer at Swarm Aero, a defense-tech startup building swarming UAVs, to own the aircraft system architecture: translating mission requirements into specs, maintaining ICDs and MBSE models (SysML/Cameo), driving cross-discipline integration, and supporting HIL/SIL testing and flight verification.
Systems Engineer, Additive Manufacturing
A hands-on systems engineer who leads commissioning, qualification, and production readiness of metal additive manufacturing (PBF-LB) equipment at Hadrian's automated factories — running FAT/SAT/IQ/OQ protocols, owning machine reliability programs and P&IDs, and integrating machines into the OPUS platform. On-site in Los Angeles; $150k–$220k.
Software Engineer, Builder Tools
Software engineer on Hadrian's Builder Tools team, building and maintaining the CI/CD pipelines, internal tooling, and AI-assisted development workflows that every Hadrian engineer relies on. Core stack includes Go, Python, or TypeScript, Docker/Kubernetes, Git, and AI coding agent integration.
Software Engineer, Factory Simulation
Designs, builds, and deploys discrete-event (DES) and 3D simulations of Hadrian's automated factories to guide rapid decisions across forging, casting, machining, welding, and assembly. Day to day: prototyping simulations in Python (OOP), Visual Components, and Omniverse, and maintaining a reusable parametric simulation asset library.
Software Engineer, Core Product
Builds the core kid- and parent-facing features of Tin Can's screen-free kids' phone: the Flutter parents' app, TypeScript services on AWS Lambda/Postgres (contacts, plans, call logs, voicemail), and the call-routing service. Full-stack product work spanning services, app, and firmware touchpoints, plus an on-call rotation.
Senior Software Engineer
Builds scalable backend services, APIs, and frontend experiences for a commerce AI platform, owning high-impact initiatives end-to-end while leveraging AI tools to accelerate development and improve outcomes across core infrastructure, data systems, and product features.
Software Engineer
Junior software engineer (0-2 yrs) at Examedi taking features from idea to production for a product used by thousands of patients, working with Django and React/TypeScript. Flexible hybrid role based in the Vitacura office in Santiago, going in 2-3 days a week, in a fast-moving startup environment.
Senior Software Engineer
Build and own the data backbone for a sustainable fuels company by designing infrastructure in Python and relational databases, managing time-series data from lab instruments using DAQ software, and creating visualization tools for scientists and engineers.
Software Engineer, Growth at AIOS — Hybrid, €60k-€120k/yr inc equity
Growth engineer at AIOS — a healthcare startup building a full-stack 'AI doctor'/pharmacy — owns conversion funnels end to end: landing pages, quizzes, checkout, A/B tests, tracking/attribution, and conversational AI funnels across chat, email, and WhatsApp. Full-stack role, hybrid with 2 days/week in Prishtina, Kosovo.
Software Engineer, Platform (Mid-Senior Level)
Mid-senior platform engineer at Sprinter Health, an in-home healthcare delivery startup, building internal tooling, CI/CD pipelines, cloud infrastructure, and observability systems to improve developer productivity. Hybrid role in San Francisco on a serverless AWS stack (AppSync, DynamoDB, Lambda) with TypeScript, Node.js, and GraphQL.
Software Engineer, Enterprise Security
First product security engineer at Warp, splitting time between hands-on security engineering—building security features and improving architecture in the codebase—and product security strategy including threat modeling, incident response, and enterprise customer engagement for an agentic development environment.
Software Engineer (Radar R&D and Production Focused)
Develops and integrates software for next-generation radar systems, focusing on R&D and production deployment for defense and commercial applications using Python and Linux.
Software Engineer
Builds and improves Warp’s agentic development environment and orchestration platform, focusing on performance, reliability, and developer productivity using Rust, Go, and WASM.
Software Engineer - Platform (Senior/Staff)
Senior/staff platform engineer at a San Francisco startup building agent-sandbox runtime infrastructure for running untrusted AI agents in production. Owns low-level runtime design (Firecracker, Rust, Go), distributed scheduling and orchestration, and security/reliability at scale, working directly with the founder.
Software Engineer, Quantum Systems & Digital Engineering
Builds modular software platforms for designing, simulating, and manufacturing quantum systems at ColdQuanta/Infleqtion — digital twins, MBSE integration, and HPC/GPU-accelerated workflows. Day to day: Python scientific software, APIs, simulation orchestration, and optimization tooling built alongside physicists and engineers.
Senior Optical Systems Engineer
Eridu, a Silicon Valley hardware startup building optical interconnect infrastructure to accelerate AI data centers, is hiring a Senior Optical Systems Engineer to own test/measurement systems for its Optical Bridge program: building and automating the optical lab, running optical characterization experiments, and driving OSAT/ODM partners from design through production, using tools like Python an
Software Engineer – High-Speed SerDes
Eridu, a Silicon Valley AI-infrastructure silicon startup, seeks a senior SerDes software engineer to develop embedded firmware and control software for 224G PAM4 Ethernet, PCIe, and UCIe SerDes PHYs — covering bring-up, link training, calibration, diagnostics, and automated characterization. Core stack: C/C++, Python, SerDes/PHY, lab instruments.
Software Engineer - Recent Grad
New-grad/junior software engineer at Kikoff, a consumer fintech helping people build credit and save money. Day-to-day work spans a Ruby on Rails backend on AWS plus ReactJS and Flutter frontend/mobile apps, in a small seasoned startup team.