Founding Engineer
Fonzi AI
Fonzi puts founding-level engineers in front of some of the most well-backed AI startups in NYC and San Francisco. 30+ pre‑vetted companies review your profile and request interviews, so you don't have to apply to each one individually. The companies on Fonzi are building real systems: agentic workflows, LLM infrastructure, production AI features. Founding engineers here get equity, ownership, and problems worth solving. Not another big‑company backlog. How Match Day works Start a profile and our agent gets to know you and builds out your profile. Hiring managers request interviews from a curated group of engineers. Companies send competing offers directly. You choose what to pursue. Free, with scheduling handled for you. What we're looking for 4+ years building from 0 to 1 Full‑stack depth across React, TypeScript, Python, Node.js, and AWS or GCP AI/ML experience is a strong plus Prior startup experience or meaningful ownership at scale Someone who can run at a problem with incomplete information Who tends to be a fit Engineers who've been at a startup and want the founding seat this time FAANG engineers ready to stop optimizing and start building Technical leaders who want real equity, not options that vest into nothing #J-18808-Ljbffr
- ...A pioneering hardware company in San Francisco seeks a founding engineer to lead the development of an advanced edge computing device. You will own the entire hardware product lifecycle, focusing on rugged designs and seamless data transmission. Ideal candidates have over...Suggested
- Mentum (Acquired by Nuvocargo) is seeking a Founding Engineer in San Francisco, CA to build AI-driven solutions for supply chain automation. This role offers a unique opportunity to shape the future of the product and tackle complex challenges in AI. You will be responsible...Suggested
- Goblin Labs is hiring a Founding Engineer to design, build, and optimise core systems powering real-time AI personas. You will work on low-latency rendering pipelines, multi-modal context handling, and robust integrations with user interfaces. You’ll architect production...SuggestedRemote jobFull time
- Join Hire Hangar and work with fast-growing global companies while building a long-term career. Job Title| Founding Systems Engineer (Performance) Location | On-Site — San Francisco, CA Time Zone | PST Role Overview: We are seeking a Founding Systems Engineer to join...SuggestedContract work
- AI Talent Now is looking for a Founding Engineer in San Francisco to develop wearable AI systems for industrial settings. The role is full stack-oriented with responsibilities in core model development, backend work, and customer-facing products. The ideal candidate will...Suggested
$180k - $250k
We’re hiring a Founding AI Systems Engineer to build the intelligence layer for the leading AI companion for language learning. You’ll own the core AI systems powering personalized conversations for millions of users. Language learning shouldn’t feel like an app — it...$180k - $250k
A leading AI language learning platform is hiring a Founding AI Systems Engineer in San Francisco. You will lead the architecture of AI systems that enhance language learning through personalized dialogue. The role requires a systems-thinking background and experience...$120k - $200k
Red Cedar Ventures seeks a Founding Engineer to build the core intelligence behind AutoSitu’s review agents. This role offers a unique opportunity to shape product direction and work closely with founders. You will develop multimodal systems that enhance construction documentation...- SupportFinity™ in San Francisco is looking for a Founding AI Systems Engineer to build core systems for a leading AI companion in language learning. You will develop AI architecture that ensures personalized conversations for millions, addressing challenges like memory...
- A technology company in San Francisco is seeking a Founding Fullstack Engineer to build scalable systems that automate complex decisions in manufacturing. Ideal candidates will have experience with data-driven agents, strong product sense, and the ability to ship production...Relocation
- TruNorth LTD is seeking a Founding Software Engineer to join its San Francisco team or London-based candidates willing to relocate in 2026. This role focuses on building enterprise-grade AI agents for Fortune 500 clientele. The ideal candidate will have a passion for early...Relocation
- Trajectory, based in San Francisco, is seeking a Founding Generalist Engineer to craft the product experience for continual learning. The role involves owning the SDK and API surfaces while working directly with founders and industry-leading partners. Ideal candidates...
- ...companies within our portfolio by connecting them with talented potential candidates. One of our portfolio companies is hiring a Founding Engineer to lead development on a consumer crypto app that’s already live with meaningful traction. This is not a listing for an...Remote workWorldwide
- SupportFinity™ is seeking a Founding Engineer to lead development of a consumer crypto app, joining as the first engineering hire with a growing user base. You will own core features and drive architecture across the stack. Work across the core app, SDKs, and integrations...
- ...Founding Engineer (Full Stack) Location: San Francisco Bay Area Type: Full-Time Compensation: Competitive salary + meaningful equity (founding tier) Backed by 8VC, we're building a world-class team to tackle one of the industry's most critical infrastructure problems...Full time
- ...We’re hiring a Founding Full-Stack Engineer to join our team! This role is full-time in San Francisco at our Presidio office. Gauge helps companies show up in more AI answers. Search traffic is shifting away from Google into AI chat, and companies are figuring out how...Full timeWork at officeImmediate startShift work
$350k
...conversations consistent and personalized across all channels. Reverse engineering legacy healthcare systems that don't have public APIs to... ...who desperately need them. We're looking for exceptional founding engineers to help us realize this ambition. If you're an...Contract workNight shift$145k - $195k
...The Role We’re hiring our first Founding Engineer — someone who will work alongside the founder to build Multifactor’s platform from the ground up and shape the technical foundation of the company. This is not an “early employee” role where you slot into an existing codebase...Work at office- ...Blind Bio is solving for. About the Role As an AI‑focused Software Engineer at Double Blind Bio, you will help build and operate... ...research workflows Experience working in early‑stage startups or founding teams Deep expertise in at least one area of the stack (frontend...Worldwide
$175k - $200k
...About the Role Join an early-stage, Y Combinator-backed AI marketing automation startup as a Founding Engineer (Full-Stack) . You'll be one of the first engineers on the team, taking full ownership of features from concept through deployment - working directly with...Full timeWork at officeRelocationVisa sponsorshipRelocation package- ...Developer We are looking for a highly skilled AI Developer to join us on our mission to build the future of search. As the founding engineer, you'll shape the foundation of a high-impact technology with a scrappy but rigorous, and a product-led growth mentality. You...
$130k - $160k
...Job Description Founding Engineer (AI / Full Stack) San Francisco, USA (Relocation + Visa Sponsorship) $130,000 - $160,000 + Equity Revive Recruitment are proud to be partnered with an early-stage AI / HR Tech start-up backed by pre-seed funding, building...Work at officeRelocationVisa sponsorship- ...About the Role We're looking for founding Machine Learning Engineers (MLEs) to own and improve our core action models end-to-end— the intelligence that powers Composite's proactive automation platform. You'll work at the intersection of LLM inference, browser understanding...
$150k - $250k
...tl;dr: This is a 1 of 1 role. We're looking for a founding engineer to work alongside a Thiel Fellow founder as literally employee #1. Great compensation, equity, and perks. About Empathic “…but I tell you all today, I would rather die a man than live for all eternity...Work at officeImmediate startNight shift$150k - $250k
...AgentMail is building the identity and communication infrastructure for AI agents, starting with email. We are looking for a Founding Engineer with backend and infra focus to architect systems for agents as the end users. Responsibilities Design APIs that are intuitive...Work experience placementInternship- ...This is a foundational role: Sim is hiring our first GTM Engineer to build the company's go-to-market and RevOps infrastructure from... ..., custom internal tools, and data-driven outbound campaigns Found and scale: Set the technical standard and shape the DNA of Sim...Full timeWork at officeImmediate startVisa sponsorshipRelocation package
£60k - £120k per year
...London Employment Type Full time Location Type On-site Department Engineering Compensation £60K – £120K • Offers Equity Why we're hiring... ...like? We think 9am‑6pm will bring a great cadence to work. As a Founding Engineer there will definitely be times you need to pick up...Full timeWork at officeRemote workWork from homeRelocationVisa sponsorshipWork visaRelocation packageFree visaSkilled worker visaFlexible hours- ...huge: End-to end testing is broken. Teams either waste tons of engineering hours maintaining fragile, selector-based tests that break... ...that we're all professional firefighters (fun fact, one of our founding engineers was formerly an actual firefighter) Talk to customers...Work at officeNight shiftWeekend work
- A tech startup in AI is seeking a Founding Engineer in San Francisco to set the strategic foundation for the Engineering Team. Responsibilities include designing user-critical features and collaborating with engineers and researchers. Ideal candidates should have 8+ years...
- ...platforms. Define Technical Strategy and Culture: You will collaborate closely with the founding team to shape technical strategies, influence product development, and establish our engineering culture and best practices. Proactive Problem Solving: You will drive success by...
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