Founding Engineer, Full Stack (Product-Minded)

Full-time | On-site

Location: San Francisco

We are building a unified platform that streamlines the use of large language models (LLMs) to build and deploy applications at scale. We are seeking a Founding Full Stack Engineer to own the entire application layer, driving developer productivity by providing a single pane of glass for data collection, model evaluation, training, and deployment.

As a Founding Engineer, you will be a product-minded generalist responsible for the entire feature lifecycle. You'll primarily focus on the backend systems that interface with our core machine learning (ML) stack, ensuring a scalable and reliable platform for our customers.

What You'll Do:

Senior Fullstack Engineer (Founding AI Focus)

Location: New York City, NY (Hybrid, 3+ days/week on-site)

Employment Type: Full-time

Salary Range: $150K - $250K (Based on experience and quality)

We are a high-growth, mission-driven startup focused on delivering AI-powered solutions in the healthcare sector, specifically targeting a large, underserved patient population. Backed by top-tier VCs, this is a ground-floor opportunity for a high-impact engineer to join as a founding member and lead the technical architecture from inception to launch, with a clear path to engineering leadership.

We are seeking a Senior Fullstack Engineer with 4-10 years of experience to lead the design and launch of our AI-first product. You will work directly with the co-founders, owning major technical decisions and shaping the engineering culture. This role requires speed, autonomy, and a commitment to driving measurable, meaningful impact in a challenging healthcare domain.

Your Key Responsibilities:

Product Engineer - AI-Powered Collaborative Care Platform

Location: Hybrid - New York or Boston

Compensation: $160,000 – $225,000

We are building an AI-first medical practice from the ground up, focused on a future where collaborative care models integrate clinicians and AI to provide superhuman medical advice. Since our founding, we have raised over $35M from top-tier VC firms and are on track to serve hundreds of thousands of patients, partnering with prominent healthcare organizations nationwide. We are seeking a talented, driven Product Engineer to define the future of human + AI collaborative care.

This is a high-responsibility, hybrid role where you will have significant ownership over our core product and the opportunity to shape the future of our engineering organization. Your work will span the full technology stack, working across web, mobile, backend infrastructure, and AI/MLOps, all while ensuring stability and data integrity for enterprise clients.

What You’ll Be Working On:

Founding Software Engineer - AI Evaluation & Data Infrastructure

Location: San Francisco

compensation: $150K - $240K

We are building the most complex infrastructure that powers frontier data creation for agentic and hard reasoning workflows, helping push the frontier of LLMs and AI Agents. We work with all 5 of the leading AI labs and are experiencing sharp hockey stick growth. We are seeking a Founding Software Engineer with end-to-end ownership to build the systems that power data and evaluation for the next generation of AI.

This is a dynamic, high-impact role that offers immense breadth of ownership over projects that push the frontier of AI evaluation. You will move fluidly across the entire stack, from research prototyping to distributed cloud infrastructure and user-facing analytics. You must be comfortable with constant context switching and relentless shipping in a talent-dense environment.

What You’ll Do:

Founding Full Stack Software Engineer (Backend/AI Focus)

Location: Los Angeles, CA, US (On-site)

Employment Type: Full-time

Salary Range: $160K - $225K

We are a rapidly growing, Y-Combinator-backed (YC X25) startup operating at the intersection of AI and Cybersecurity. We are building fully autonomous, in-house AI agent systems designed to solve critical, large-scale problems in modern web application security. Join a small, high-impact founding team to define and build the core technology from the ground up.

We are seeking a skilled and passionate Founding Full Stack Software Engineer with a strong focus on backend development and AI systems. You will be responsible for designing, developing, and maintaining highly scalable, high-performance web applications and our cutting-edge AI Agent platform.

Founding Engineer - Full-Stack AI Compliance Platform

Location: On site - New York

Compensation: $200K - $250K

We are a rapidly growing AI and Security company that has already disrupted industry incumbents since launching in 2025. We are building the AI-native compliance platform that automates security and compliance (SOC 2, ISO, HIPAA, GDPR) using AI agents, turning months-long processes into days. We are looking for a Founding Engineer—a true builder ready to own features end-to-end and define the technical DNA of our product.

This is not a narrow role; we seek a full-stack builder who can execute across the entire product lifecycle. You will have deep ownership over critical, high-leverage projects, collaborating directly with the founders to move the business forward. Your code quality and product sense will set the standard for the entire engineering organization.

What You'll Do:

Front-End Engineer - Institutional DeFi Liquidity Layer

Location: Remote - US - Would consider South America & Canada (Preference for onsite/hybrid in LA)

Compensation: $ Competitive

We are an on-chain financial infrastructure company building the liquidity layer for the tokenized economy, backed by leading investors. Our flagship protocol connects tokenized assets and high-quality stablecoins to enable 24/7, real-time, compliant capital movement across blockchains. We are seeking a Front-End Engineer to design and build the user experiences that power institutional DeFi, working with production partners including major financial institutions.

You will lead the development of user interfaces for our protocol's web and mobile products and dashboards, spanning swaps, liquidity management, and analytics. This role requires translating complex blockchain and financial interactions into beautiful, intuitive, high-performance interfaces for sophisticated financial users. You'll join a small, high-velocity team, shipping code daily and defining the future of on-chain institutional finance.

Key Responsibilities:

Senior Software Engineer - Cross-Chain Intent-Driven DEX

Location: Remote

Compensation: $140K - $160K

We develop Intent-based infrastructure to enable seamless cross-chain interactions in an automated world, connecting AI, services, and financial applications. Our team, with expertise in AI, cryptography, and decentralized finance, is redefining how intelligent agents interact across blockchain networks. We are looking for a Senior Software Engineer to contribute to the improvement and maintenance of innovative Decentralized Applications (DApps) on a leading ecosystem.

This position is focused on building a blazing-fast frontend and an SDK for a cross-chain Decentralized Exchange (DEX) utilizing multi-party computation, chain signatures, secure enclaves, and intent-based architecture. You will work in a fast-paced startup environment, taking an active role in bridging the gap between business requirements and technical implementation, defining both the application's look and functionality.

Key Responsibilities:

Senior Fullstack Engineer - Web3 User Acquisition Platform

Location: Remote - US (EST Preferred)

Compensation: $150K - $200K

We are a leading web3 user acquisition platform that has powered user onboarding for over 500 protocols since 2021, facilitating over 500 million transactions and serving over 3 million users across 40+ chains. Our platform, which includes gamified activations and unique on-chain credentials, is infrastructure for major players across DeFi, gaming, AI, and NFT ecosystems. Backed by $21M in total funding, we are seeking a highly experienced Senior Fullstack Engineer to own end-to-end feature delivery across our core platform and new initiatives.

In this high-impact role, you will take full ownership of major product features from conception through deployment. You will be instrumental in driving architectural decisions for both frontend and backend systems, ensuring performance and scalability across our complex, multi-chain platform. You will collaborate directly with the Head of Product and Founders to shape product strategy, establish best practices, and mentor other engineers.

Key Responsibilities:

Software Engineer - Founder Accelerator Infrastructure

Location: New York City (Non-Negotiable Onsite/Relocation Required)

Compensation: $180K - $260K

We are the leading accelerator for crypto founders, having backed over 300 startups that are now collectively valued at over $10 billion. We are a small, high-trust, high-performance team of builders (ex-Meta, YC, Coinbase, and founders) backed by S-tier investors. We are hiring a Software Engineer to join our in-house engineering team and own features from requirements definition through production launch.

Reporting directly to the CTO, you will be a product-minded, hands-on Individual Contributor who owns the delivery of core products end-to-end. This means turning ambiguous problems into high-quality, shipped software that directly accelerates the next generation of top crypto and AI founders.

What you’ll do: