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Position Overview SyntheticFi, a YC-backed company, is growing at an extraordinary 20%+ MoM over the past year. We provide a product that our target customers (financial advisors) view as a true diffe

The role We are hiring a Founding Frontend Engineer to be the tip of the spear for turning Worktrace AI’s ambitious product vision into reality. In this role, you will be a key part of the founding te

Founding Engineer, Backend & Infrastructure About Backbone Care should be paid for the moment it’s delivered. At Backbone, we’re making that possible for the first time by building the clinical AI lay

Join to apply for the Founding Fullstack Software Engineer role at Code Four (YC X25) This range is provided by Code Four (YC X25). Your actual pay will be based on your skills and experience — talk w

Founding ML Engineer San Francisco, on-site, full-time - $200,000 - $500,000 per year. $10k referral bonus for successful hires (half equity, half cash).It's Monday, 10 AM. You walk through the glass

Data/ETL Engineer (Founding Team) Location: San Francisco Bay AreaType: Full-TimeCompensation: Competitive salary + early-stage equityBacked by 8VC, we're building a world-class team to tackle one of

Encord is the universal data layer for AI that helps 300+ AI teams train and run models on the right data. Our platform indexes, curates, annotates, and evaluates data across the full AI lifecycle, fr

Backbone Systems in San Francisco is seeking a Founding Engineer to own systems that facilitate clinical and financial workflows. You will build and scale distributed systems, focusing on automation a

Join to apply for the Founding Frontend/Design Engineer role at Rebolt (YC W25) Join to apply for the Founding Frontend/Design Engineer role at Rebolt (YC W25) Get AI-powered advice on this job and mo

Madrona Venture Labs is looking for a Founding Technical Architect for their Product Applications Team in San Francisco. This role focuses on system design for core business applications, ensuring sca

Catalog, a San Francisco-based company, is seeking an experienced engineer to develop backend systems for AI-driven commerce. The role emphasizes ownership of significant projects, working on ETL pipe

Founding Software Engineer - Backend and InfrastructureSan Francisco | In office | Full-timeWe are hiring a Founding Software Engineer in San Francisco. We are building a small, talent-dense team. Thi

Day One Partners is seeking a backend developer in San Francisco to build and scale AI-powered systems. Join a venture-backed startup creating technology to navigate chronic health conditions. You wil

BootLoop, Inc. in San Francisco is looking for a founding embedded engineer to help redefine firmware development. You will have the opportunity to own product areas from conception to deployment, wor

Clera is on the lookout for a founding engineer to join our hackerhouse in San Francisco. You will play a critical role in automating headhunting processes while working closely with our CTO. Ideal ca

Fluency Digital, Inc., located in San Francisco, is seeking a Business Development Representative to help shape the commercial team. In this role, you will build outreach playbooks from scratch and wo

Worktrace AI in San Francisco is seeking a Founding Frontend Engineer to help turn its ambitious product vision into reality. You will lead the charge in establishing the frontend aspects of cutting-e

David Joseph & Company is seeking a backend engineer in San Francisco. This role involves architecting, building, and scaling core backend systems for AI-driven document intelligence. The ideal candid

Compound AI seeks exceptional backend engineers in San Francisco to build the data pipelines that drive its AI agents. You will work directly with the founding team to integrate diverse financial data

jobr.pro in San Francisco is looking for a backend engineer to own core services that power AI voice and browser agents. You will design and build backend services, integrate with healthcare systems,

Greylock Partners in San Francisco is seeking a Senior Software Engineer to join their team. This unique position is ideal for someone with a passion for building large-scale back-end systems and an e

Probably Genetic in San Francisco is looking for a Founding Data Engineer to develop data infrastructure that supports both internal insights and customer solutions. You will work collaboratively with

a0.dev (YC W25) in San Francisco is looking for a Founding Brand and Content Lead to define the brand voice and drive content strategy as we scale from hundreds of thousands to millions of users. This

Blue Bear Capital in San Francisco is seeking a UI/UX-centric software engineer to own the frontend experience across mobile and web products. Responsibilities include building workflows and ensuring