Founding Engineer Jobs

We are looking for engineers (ML & backend) to join a startup where we’re building LLM-based forecasting systems that output calibrated probability distributions (not just answers) and improve daily based on new observations. It’s a founding role wi…

Dryft builds intelligent systems that automate complex human decisions in manufacturing operations. We’re a small, talent-dense team with modest roots and a love for the physical world - cars, machines, planes. Our team includes graduates from Stanf…

Miniswap is a marketplace for complex hobbies, starting with Warhammer. We're backed by Y Combinator and have just closed our seed funding round. In the past six weeks since we launched, users have listed $150,000 of tabletop wargaming miniatures fo…

General Catalyst-backed Stealth AI Startup | Founding Engineer | Onsite (New York City) | Full-time We’re building the AI operating system for engineering firms - automating the workflows behind the infrastructure America runs on. Founded by enginee…

At Songscription, we are building state-of-the-art AI models to automate music transcription, with the vision of enabling any musician to learn any song, on any instrument, at any level.

BusbySim is a SysML v2 system safety platform helping engineers design safer aircraft and other safety-critical systems. We are early stage, already working with some of the UK's most interesting aerospace companies, and now looking for our first en…

At Strum AI, we're reimagining technology that powers global supply chain using a fresh AI-first approach. Most supply chains are still stuck with Excel or enterprise tools that take months (and $MM) to adopt. Our mission is to lower that barrier — …

Building a photo-sharing app that uses computer vision to automate parts of sharing photos with friends. Backend ownership role: wire backend, integrate ML pipeline and mobile app, and ship. Stack includes FastAPI, Postgres, Supabase, AWS. Must have…

Magnetic (YC S25) is building an AI tax preparer for accounting firms using vision models to extract and structure data from tax documents and automatically populate legacy tax software. Hiring multiple founding roles for a small, senior, in-person …

Phrasing is a language learning application optimized for learning and maintaining multiple languages, and designed to take you all the way to fluency and beyond. It's the professional language learning application for serious learners. It's built w…

foam is building a new observability stack purpose-built for AI to capture, trace, and link everything and feed complete context into AI to automatically identify and root-cause breakages. The team is five people; Perla (CEO) was the 5th engineer at…

Bevyl is a pre-seed startup (team of 2) building AI-powered content creation tools for consumer brands. We're making it possible for brands to produce high-quality social media content at scale without agencies or massive creative teams. You'll work…

GetFast is a small team on a mission to simplify running through wearables data. Seeking a founding engineer to shape product and company direction, work across the stack from building reliable, scalable systems to rapidly prototyping and launching …

Metly is a pre-seed startup (team of 5) building strategic intelligence for pharmaceutical companies. We're aiming to replace consultants. Pharma companies hold critical knowledge across disconnected systems—regulatory filings, clinical pipelines, c…

Join as the 4th team member to redefine the most universal interface in business: the spreadsheet. Building an AI spreadsheet that automates knowledge work, allowing users to describe tasks in plain English and get immediate, trustworthy results. La…

We9re building Cursor for doctors. At Vibrant, we9ve picked the expensive, high-touch, data-heavy subspecialties of functional, integrative, and longevity medicine, and we9ve created AI agents that reduce hours of clinical work to minutes. We9re…

Founded by the founder of Citymapper, Talk Machine is hiring founding engineers, focusing on backend engineers and ML/voice specialists to build a consumer voice product/platform using AI to improve human communication. Application process involves …

Tracebit is an Accel-backed, UK-founded security product company focused on canaries for intrusion detection. They work with companies like Docker, Riot Games, Synthesia, and Zepz to help detect threats in cloud and enterprise. Current openings incl…

Tendavo helps SMEs win public procurement tenders. Bootstrapped and profitable with around 100 customers. Hiring a Founding Engineer to work side-by-side with the CTO to architect and build the platform, design agents and LLM workflows to replace ma…

We are building an autonomous trust layer to enable audits to shift from a compliance burden to a world where auditors can be risk navigators, providing companies the assurance needed to adjust continuously in an ever-changing world. We are a small,…

Founding Engineer | Full-time | ONSITE (San Francisco, US). FlowGen Labs' mission is to make ERPs usable by humans again. We’re shipping AI agents as an interaction layer that automates routine steps, explains the “why,” and unlocks instant visibili…

Elastics is building an AI-native operating system for trading — deterministic agents, live data, portfolio management and execution across prediction markets, crypto, and beyond. We are Pre-Seed funded, working with our first clients, and need a Fo…

At Songscription, we are building state-of-the-art AI models to automate music transcription, with the vision of enabling any musician to learn any song, on any instrument, at any level. Apply at https://songscription.ai/careers and/or feel free to …

Fully funded B2B sports betting exchange hiring a Founding Engineer to own end-to-end build, set technical foundations, shape the stack and hire and grow the team. Hands-on coding role with leadership and architecture responsibilities; startup exper…

Zenact AI is building AI agents that test apps like real users. Recently launched with 35+ signups from leading Indian unicorns and soonicorns, backed by team with Zomato experience. Hiring Founding Engineers (full-time) and 6-month interns (early c…

AI-powered platform for resume optimization and job application automation. Role: Build technical foundation as the first engineering hire. Own end-to-end features (Python/FastAPI/JS), architect scalable systems, and shape product direction. Ideal f…

We are looking for a Founding Engineer to join us at sortie. As our first hire, you will join the 3 technical founders in building and supporting our core platform. sortie is a pre-seed funded startup building point to point operations for the remot…

We’re building the account intelligence layer to orchestrate AI agents that move revenue and retention. Live with several enterprise customers and backed by Acrew Capital, Emerson Collective, Recall Capital, and angels from LinkedIn, BetterUp, Glean…

Tracebit is an Accel-backed UK-founded security product company focusing on canaries for intrusion detection. The company works with customers including Docker, Riot Games, Synthesia and Zepz. Currently hiring founding roles across engineering, secu…