Founding Engineer Jobs

Lead Keycard’s GTM engineering as the first hire to design product-driven, developer-focused adoption systems and scale agent-native workflows.

Founding Engineer at Root Access to build production-grade transformer and agentic AI systems that power applied, self-learning products.

ResiQuant is hiring a backend-focused Full Stack Engineer to build and operate scalable AI-powered services that provide enterprise property risk intelligence.

Lead architecture and development of a new AI-driven B2B SaaS platform for a pre-Series A startup focused on automating complex manufacturing workflows.

Lead ML engineering as the Founding AI/ML Lead to build and ship the core generative AI systems powering an autonomous product-design agent at an early-stage startup.

Build and ship agentic workflows and user-facing products on Kumo's Relational Foundation Model, working cross-functionally and engaging directly with customers to iterate and drive adoption.

As Sift’s first Security Engineer, you will own end-to-end security for a high-assurance telemetry platform—building technical controls, automating compliance, and supporting customer and audit engagements.

Domu.ai is hiring a Founding Senior Engineer in San Francisco to own product-level decisions, ship daily, and help scale their voice-AI platform for enterprise customers.

Lead the design and implementation of scalable RL recipes and environment tooling at an early-stage company providing post-training data and RL infrastructure to foundation model labs.

Solve core technical challenges as the Founding AI Engineer at a seed-stage AI company reinventing wealth management from the ground up.

Principal Founding Full Stack Software Engineer needed to lead full-stack development and architecture for Voker’s LLM-focused developer platform in-office in Woodland Hills, Los Angeles.

Lead development of LLM-driven systems at a mission-driven healthcare startup, focusing on prompt engineering, model optimization, and scalable AI product delivery.

Build and shape an AI-first product for small businesses as the founding full-stack engineer, owning frontend, backend, and integrations at an early-stage NYC startup.

Help build and scale Termblocks' agentic AI platform for capital markets as a Founding Backend Engineer focused on backend architecture, production systems, and LLM integrations in Midtown Manhattan.

Help build and scale Termblocks' agentic AI platform for U.S. capital markets as a Founding AI Engineer, owning features from design to production and experimenting with cutting-edge models.

Help build and scale autonomous AI digital workers as a Senior Full-Stack Engineer on a fast-moving, well-funded startup team based in San Francisco.

Be a founding senior engineer at an early-stage fintech startup building agentic AI for capital markets, owning features from design to production and driving model-led product innovation.

Founding Fullstack Engineer (frontend-focused) needed to design and build the core UX and scalable frontend for a next-generation social marketplace for AI products in San Francisco.

Termblocks is hiring a Founding Senior Backend Engineer to build and scale agentic AI infrastructure for the U.S. Capital Markets at an early-stage, VC-backed startup in Midtown Manhattan.

Lead backend architecture and implementation for an early-stage NYC startup as the Founding Senior Backend Engineer, owning core systems and guiding technical direction.

Founding Senior Engineer needed to design and own the scalable backend and database for a high-growth AI startup transforming insurance claims.

Help shape the core product and architecture at Granted as a founding full-stack engineer, building end-to-end TypeScript features and solving AI-driven problems in healthcare.

Build scalable full‑stack solutions and AI/LLM integrations at StudyFetch, working in-person with the founding team to impact millions of learners.

Help shape Granted’s core consumer product as a founding product engineer, building delightful, reliable experiences with a TypeScript-first stack and AI-enabled workflows.

Be a founding AI Engineer at a fast-moving Berkeley startup, building agentic matchmaking, chat agents, and internal AI tooling that power scalable, production-grade experiences.

Help build Ditto's AI-first social networking platform as a founding engineer, owning customer-facing features and internal tools while collaborating with product and research teams.

As a founding full-stack engineer at an 8VC-backed startup, you will design and build core APIs, data pipelines, web UIs, and deployment systems while shaping the technical direction and early engineering culture.

Join a seed-stage AI-first startup as a founding engineer to build and ship the core models, retrieval systems, and agent flows that make Anything intelligent.

Lead the frontend at Anything as the founding Design Engineer, shaping AI agent UX and delivering high-quality, performant product experiences used by millions.

Lead the architecture and operation of Anything's core infra—building scalable, secure, and observable platform systems that let our AI agent deploy, monitor, and self‑repair apps at massive scale.

Effective AI seeks a founding software engineer in San Francisco to architect and build agentic AI systems that automate underwriting and claims workflows for the insurance industry.

Founding Engineer at a Series A AI startup in NYC to lead end-to-end product development and deliver GenAI-driven dispatching and forecasting features.

Lead development of the core AI agent layer and mobile-deployable vision models for a rapidly scaling golf-tech startup based in Irvine, CA.

Join Momentic’s core engineering team to build and ship an AI-first automated testing platform, taking broad ownership across frontend, backend, and infrastructure.

Be a founding engineer at a Cherry-backed stealth AI fintech company reimagining B2B payments with modern full‑stack and AI-first architecture.

Stack AI seeks a Founding Engineer to lead RAG, embedding, and production AI workstreams for its no-code AI pipeline platform.

CareSwift seeks a Full-Stack Engineer with EMS field experience to own product features, ship fast, and directly impact EMS workflows in our NYC-based startup.

Lead architecture and implementation of Sailor Health’s AI-first full-stack platform, building clinical workflows, therapist tooling, and conversational AI features from prototype to production.

Stack AI is hiring a Founding Frontend Engineer to build and own high-quality React/TypeScript interfaces and the company’s landing pages at an early-stage AI startup.

Lead backend development at Stack AI, helping scale a no-code platform that connects LLMs and data sources to power AI applications for thousands of users.

Freckle is hiring a front-end–focused Full Stack Software Engineer to design and ship customer-facing GTM features while collaborating closely with users and the product team.

An early-stage full-stack engineer (frontend-heavy) to design elegant, performant UIs for AI-driven clinical workflows and help shape product and engineering culture at a fast-moving healthcare startup.

Help build LLM-integrated, real-time clinical workflows as a founding full-stack engineer at an early-stage NYC healthtech startup.

Lead the design, deployment, and validation of Sorcerer’s forecasting stack—blending NWP, ML, and balloon observations—to deliver operational weather products and scale a weather team from the ground up.

High-growth AI startup Basis seeks a Founding Sales Engineer in NYC to lead value-based demos, technical evaluations, and enterprise deal strategy for accounting customers.

Founding Staff Software Engineer to lead architecture and delivery of high-performance, scalable systems for an AI-driven shopping platform aiming to scale to 1B+ searches annually.

Lead Lantern's ML stack as the founding AI engineer, building production forecasting, MLOps, and inference services that directly improve customers' inventory and cash flow.

Lead the enterprise sales function for OpenObserve as the first sales hire, closing $250K+ ARR deals across cloud and self-hosted offerings and shaping go-to-market strategy with the founders.

An early-stage full stack engineer role focused on building AI-native music data systems, front-end experiences, and cloud infrastructure at Syncopate.

Lead the development of advanced AI systems at a New York-based firm innovating hiring through fraud detection and skill evaluation.