Frontend Engineer (Founding Team)Location: San Francisco Bay AreaType: Full-TimeCompensation: Competitive salary + meaningful equity (founding tier)At fabrion, backed by 8VC, we are on a mission to assemble a world-class team aimed at solving one of the industry's most pressing infrastructure challenges.We are developing an AI-native data platform that streamlines the most intricate workflows in deep industrial applications. We seek a passionate frontend engineer eager to transform complexity into clarity and deliver exceptional user experiences in robust systems.As part of the founding team, you will collaborate closely to create and launch intuitive user interfaces for multi-tenant analytics visualizations, agent interfaces, and workflow tools. If you've ever found enterprise UIs to be cumbersome or confusing, this is your opportunity to innovate.This role is situated in an early-stage, high-autonomy environment where you will help establish the foundational UX patterns and design language of a next-generation SaaS platform.

Join a dynamic client of Weekday, one of the fastest-growing startups from Y Combinator. Your application will be prioritized if submitted through this platform.About UsWe are an innovative early-stage startup focused on developing AI-driven tools that enhance consumer application user experiences automatically. Our product is already live and being utilized by millions of users worldwide, demonstrating impressive month-over-month growth.Supported by prominent investors and experienced operators, we are on an exciting journey ahead.Having raised over $5 million, we recently launched our product!The RoleWe are seeking a talented full-stack engineer to contribute to the development and scaling of our AI-powered experience editor. You will engage with both front-end and back-end technologies, significantly influencing our product and infrastructure.This role is high-impact, offering substantial ownership, rapid iteration, and real-world scalability exposure.What You'll DoDevelop essential features for our AI-driven editor and experimentation platform.Create scalable back-end solutions and deliver clean, user-friendly interfaces.Integrate new APIs and AI models to enhance intelligent user experiences.Work collaboratively with founders and customers.Take full ownership of projects from inception to completion in a fast-paced, hands-on environment.DetailsFull-time, in-person role located in San Francisco (Monday–Saturday).Must be authorized to work in the U.S.

At Outsight, we celebrate the proactive spirit of individuals eager to contribute to our mission. If you are passionate about what we do and believe your skills and experiences align with our vision, we invite you to submit a spontaneous application.To apply, please upload your resume, and our dedicated recruitment team will review your submission. If a suitable opportunity arises, we will reach out to you promptly. Thank you for considering Outsight as your future workplace; we look forward to connecting with you.

Are you looking to become a part of a dynamic and forward-thinking company? If you are enthusiastic about technology and innovation but don’t see a current opening that fits your profile, we encourage you to apply here! We are always on the lookout for talented individuals who can contribute to our mission.

Role OverviewLocation: San Francisco, CA or Remote (US) Work Model: In-office/RemoteAbout Effective AIAt Effective AI, we are pioneering the future of work by pushing the boundaries of artificial intelligence. We believe that the true potential of AI lies not in automating simple tasks, but in enhancing complex knowledge work that requires critical thinking and expertise. Our mission is to create advanced AI Teammates that excel in navigating intricate workflows and collaborating seamlessly with human professionals. We are initially focusing on the trillion-dollar U.S. Property & Casualty insurance sector, an area rich in data and complex processes, presenting an exciting challenge.Having secured $10 million in seed funding from esteemed investors such as Lightspeed Ventures and Valor Equity Partners, our team is based in San Francisco and thrives on close collaboration to tackle these daunting challenges.Your Role and ResponsibilitiesAs a Founding Frontend Engineer, you will be an integral member of our pioneering team, instrumental in crafting and developing our core product from its inception. You will explore the intersection of AI and human collaboration through data-intensive analytical projects tailored for insurance professionals.Key responsibilities include:Facilitating long-term task execution by establishing essential UX patterns for engaging with multi-turn, multi-tool AI systems.Empowering actuaries and underwriters to process thousands of documents simultaneously by providing them with coding tools and coding agents.Designing and implementing our frontend architecture using contemporary frameworks (React, TypeScript, Tailwind), with a strong emphasis on performance and maintainability.Hands-on involvement with our backend and core agentic platform, all developed in TypeScript.Collaborating closely with design, backend, and machine learning engineers to craft comprehensive user experiences.Rapidly prototyping and iterating on features while balancing speed and quality in a dynamic startup environment.Who You AreWe are in search of an innovative and driven creator eager to take on challenging problems.You possess a genuine passion for AI and thrive on solving ambiguous challenges through first principles thinking.You have extensive experience in developing production-ready web applications.

General ApplicationAt Physical Superintelligence, we are constantly on the lookout for outstanding individuals who are eager to make a difference. If you are driven by a passion for the convergence of artificial intelligence and physics, and you believe you have the skills to help us achieve our ambitious goals, we would love to connect with you.About Physical SuperintelligenceFounded by a diverse team from prestigious institutions such as Harvard, MIT, Johns Hopkins, Oxford, and others, Physical Superintelligence is at the forefront of innovation. Our mission is to develop advanced AI systems that can explore and uncover new physics at an unprecedented scale.

About FoundAt Found, we recognize the unique challenges faced by the self-employed workforce, which encompasses a vibrant community of 60 million Americans. Navigating complexities such as taxes, accounting, bookkeeping, and business banking can be daunting. That's where we step in.We are dedicated to crafting innovative tools that empower self-employed individuals with the security and peace of mind that has traditionally been reserved for larger corporations. Our business banking solutions automate tax and expense tracking, allowing small business owners to focus more on their passions rather than their finances.We invite kind, resourceful, and passionate individuals to join us in creating a robust safety net for the self-employed.Key Responsibilities:Collaborate with cross-functional teams to shape the product roadmap and influence company-wide strategy; analyze customer trends, gather product feedback, and identify pain points.Mentor managers to ensure their teams achieve goals and excel in their daily operations.Establish and track KPIs, OKRs, and operational tasks to drive team performance; develop strategic initiatives for the Customer Experience organization.Contribute to the creation of internal processes, policies, documentation, and training that bolster team effectiveness.Assist customers by managing high-profile internal and external escalations.

About MercorAt Mercor, we are pioneering the fusion of labor markets and artificial intelligence research. Collaborating with premier AI laboratories and enterprises, we deliver the essential human intelligence required for AI evolution.Our extensive talent network empowers the training of cutting-edge AI models, akin to how educators impart knowledge to students—by sharing insights, experience, and context that transcends mere code. Currently, our network of over 30,000 experts generates more than $2 million daily.We are establishing a novel domain of work where expertise propels AI progress. This ambitious endeavor necessitates a dynamic, fast-paced team dedicated to innovation. You will collaborate with researchers, operators, and AI enterprises that are reshaping societal systems.Mercor is a thriving Series C firm, valued at $10 billion, and operates five days a week in our state-of-the-art San Francisco headquarters.About the RoleAs a Frontend Engineer at Mercor, you'll be part of a small, product-focused engineering team tasked with designing and developing user-centric systems that enhance our core AI infrastructure. This high-impact role involves close collaboration with design, product, and backend engineers to deliver intuitive, high-performance, and scalable experiences for top-tier AI labs. From day one, you’ll contribute production-quality code, manage projects from inception to completion, and maintain a balance between speed, quality, usability, and scalability.At the conclusion of the onboarding process, you will be matched to a team where your skills can create the most significant impact in one of the following areas:Talent Platform Side – Developing next-generation tools that automate the recruitment process, intelligently match candidates to roles, and facilitate global hiring with streamlined contracts and payments.Applied AI/Human Data Side – Partnering with renowned AI researchers from organizations like OpenAI, Anthropic, and Google to construct post-training datasets that enhance foundational model capabilities.Your ResponsibilitiesDesign and implement user-friendly, high-performance interfaces that function seamlessly across platforms.Integrate APIs and data flows with backend systems effortlessly.Collaborate with design and product teams to transform wireframe concepts into live products.Write clean, maintainable React and TypeScript code, while also contributing to frontend documentation.Engage in design reviews, code reviews, and retrospectives to foster continuous improvement.Address complex product and technical challenges with innovative solutions.

Join voxel as a Founding Forward Deployed Engineer, where you will play a pivotal role in shaping our technology solutions while directly engaging with clients. This is an exciting opportunity to leverage your engineering skills in a dynamic startup environment, driving innovation and customer success from the ground up.

At alljoined, we invite you to 'Shoot Your Shot' and become part of our dynamic team in San Francisco! As an innovative company dedicated to fostering collaboration and creativity, we are on the lookout for passionate individuals who are eager to make a difference.

At HeartFlow, we are revolutionizing the diagnosis and management of coronary artery disease, the leading cause of death globally, through state-of-the-art technology. Our flagship offering, the HeartFlow FFRCT Analysis, is an AI-powered, non-invasive cardiac test recognized by the ACC/AHA Chest Pain Guidelines. It provides a detailed, color-coded 3D visualization of a patient’s coronary arteries, illustrating how blockages affect blood flow to the heart. As pioneers in AI-driven integrated heart care solutions, we are committed to assisting healthcare professionals with tools like RoadMap™ Analysis, FFRCT Analysis, and Plaque Analysis for enhanced patient assessment. Join our growing team and play a vital role in transforming precision heart care.HeartFlow is a publicly traded company (HTFL) renowned for its groundbreaking contributions to healthcare innovation. Our solutions are endorsed by medical societies worldwide and are compliant for use in the US, UK, Europe, Japan, and Canada, having already benefited over 500,000 patients globally.We are in search of a Frontend Software Engineer who is enthusiastic about developing advanced web applications that make a difference in healthcare. If you possess a strong passion for front-end technologies and have a knack for crafting intuitive, high-performance client-side applications, consider joining HeartFlow. As a Frontend Software Engineer, you will collaborate with a team of seasoned engineers to create web solutions that surpass the expectations of healthcare professionals.

Join clera, an innovative startup poised to make waves in the tech industry. As a Founding Engineer, you will play a pivotal role in shaping our product and technology from the ground up. Collaborate with our founding team to design and implement cutting-edge solutions that redefine user experiences.

About the RoleJoin our founding team at Known as an Operations Associate and play a pivotal role in executing an extraordinary consumer launch in 2025. Collaborating closely with our Head of Operations, you will steer go-to-market strategies, foster partnerships, support recruitment efforts, and ensure our operations run seamlessly.This is a unique opportunity to join a well-funded startup ($10M seed funding from one of San Francisco's leading consumer VCs), create a groundbreaking category in AI-driven dating, and take on significant responsibilities right from the start. You will thrive in a fast-paced environment, learn rapidly, and help define how Known enters the market.What You’ll DoSupport GTM Strategy - orchestrate launch plans, timelines, and cross-functional execution.Drive Partnerships - identify, engage, and maintain relationships with venues, creators, and brand partners.Coordinate Marketing Efforts - collaborate on campaigns, events, and content operations with the growth team.Recruiting Support - assist in building candidate pipelines, enhancing candidate experiences, and ensuring hiring timelines are met.Financial Operations - manage expenses, track payments, and help maintain financial health.Work Directly With Founders - contribute to daily strategic decisions across product, growth, and operations.Operational Excellence - develop processes that enhance efficiency, intelligence, and continuous improvement.

Join Blueberry, a pioneering startup, as we transform the way brands connect with their audiences. Our mission is to re-establish the personal touch in marketing by enabling brands to engage authentically with their customers, even at scale. We are redefining customer engagement through deep insights and tailored interactions that resonate with each individual.As a Founding Engineer, you will play a crucial role in architecting the future of our platform. Collaborate closely with our founders and design team to build and enhance our core product, ensuring it meets the unique needs of brands with millions of followers. Your work will directly influence our technical infrastructure, product development, and company culture.Key responsibilities include:Developing and scaling our innovative product that empowers brands to connect with followers authentically.Making strategic architectural decisions that facilitate rapid development while preparing for future expansion.Translating client needs into effective technical solutions that prioritize speed, quality, and reliability.Cultivating a high-performance engineering culture characterized by collaboration and a focus on product excellence.

Join us at clera as a Founding Engineer specializing in matchmaking technology. This is a unique opportunity to be part of an innovative startup in the heart of San Francisco. As a founding member of our engineering team, you will play a crucial role in designing and building a cutting-edge matchmaking platform that connects users in meaningful ways.

Join Pensive as a Founding Engineer (AI/GTM)At Pensive, our mission is to harness the power of AI to revolutionize education and streamline business operations. Visit our Notion page to explore our vision, meet our founders, and understand our culture.Your Role and ContributionsAs a Founding Engineer specializing in AI and Go-To-Market (GTM) strategies, you will play a pivotal role in shaping our AI-driven solutions. Your innovative approach will be vital in developing automated systems that enhance our grading and tutoring platform, helping educators and students achieve more.You will be responsible for:Developing traditional AI engineering solutions, creating AI pipelines that optimize our educational platform for instructors and students alike.Implementing GTM engineering strategies to enhance customer management, business growth, and operational efficiency.Automating various business processes, from data management to customer onboarding, ensuring seamless operations.Example tasks include:Monitoring and enhancing the AI performance of our grading system.Creating a system for automated course categorization that aligns with our offerings.What We SeekWe are in search of dynamic individuals who are adept at leveraging AI to tackle challenges and drive solutions. Essential qualifications include:Exceptional problem-solving abilities and creativity.A strong understanding of AI-generated code, particularly in backend and AI-related domains.A quick learner who can thrive in a fast-paced environment.Preferred QualificationsExperience in prompt engineering and AI pipeline development.Hands-on experience in building applications from the ground up.Capability to write or comprehend frontend code.Our Technology StackFamiliarity with the following technologies is not mandatory for this role:Backend: Python, FastAPI, PostgresFrontend: TypeScript, React, TailwindCSS, Tanstack RouterInfrastructure: GCP, Cloud Run, FirebaseMobile App Development: CapacitorInterview ProcessWe look forward to welcoming you to our team!

About UsFlowGen Labs is an innovative startup situated in the vibrant San Francisco Bay Area, proudly backed by top-tier investors. Our dynamic and talented team is currently operating in stealth mode, focusing on creating an agentic platform that addresses some of the most challenging yet critical software issues faced by Global 2000 companies. We tackle complex business logic, essential systems, and extensive codebases where reliability is paramount. By integrating program analysis, developer tools, and code generation, we aim to revolutionize multi-year enterprise transformations, enabling teams to achieve results in a fraction of the time, all while ensuring verification, auditability, and real-world guarantees. Join us at the forefront of the intersection between ERP and artificial intelligence, and be part of a founding team that offers substantial equity and growth potential.Role SummaryAs the Founding Engineer, you will take charge of developing a zero-to-one product and its underlying infrastructure. Your responsibilities will include creating secure connectors and runtime systems that comprehend complex enterprise environments, enhancing developer experiences through innovative tools, and building an analysis and planning engine to modernize legacy code. You will collaborate closely with customers on impactful projects and play a key role in shaping our culture, engineering standards, and product roadmap.Design and implement the agentic layer, ensuring self-checking, reflection, and verification before results are delivered to users or downstream systems.Possess experience in orchestrating agentic workflows and retrieval augmented generation, with a preference for familiarity with LangGraph.Establish low-latency inference paths with comprehensive token-level observability.Productionize prompt pipelines, retrieval mechanisms, and light fine-tuning where it significantly impacts outcomes.Utilize AI tools actively, bringing innovative ideas for their application in development, testing, data management, and support.Exhibit an ownership mentality, effective communication, and the ability to make decisions with limited information.Demonstrate agility in a fast-paced environment, embracing new technologies with a problem-solving attitude.Why Join UsMake a direct impact on our product and company with minimal bureaucratic hurdles.Join a team that values high standards for craftsmanship, speed, and pragmatic delivery.

Join Our Team at MiravoiceAt Miravoice, we are revolutionizing the way conversations are captured on a large scale. Our innovative platform features an AI voice agent designed for pollsters and market researchers, enabling them to conduct engaging and natural-sounding surveys with ease. Our mission is straightforward: to provide our clients with more data, at a quicker pace, and at a lower cost. We envision a future where the voice economy flourishes, making precise data collection seamless and efficient.Our Expert TeamOur talented team is composed of former engineers, tech product managers, and machine learning researchers, all of whom possess extensive knowledge in voice AI, SaaS, and survey methodology. We have backgrounds in computer science and artificial intelligence from prestigious institutions like Stanford, Yale, and UCLA, and have previously led significant projects at renowned companies such as Google, Apple, VMware, and McKinsey. Miravoice is proudly backed by leading tech investors, including Unusual Ventures, Neo, and 25madison Ventures, along with angel investments from industry experts at Google, Ramp, Atlassian, and PubMatic.Role OverviewAs a Founding Engineer, you will play a pivotal role in shaping both our product and our company’s future. Collaborating closely with the founders, you will be responsible for designing the architecture, delivering essential features, and influencing the overall product vision. You will have the autonomy to make impactful technical decisions, and your contributions will significantly steer our product development. This role goes beyond programming; you will also have opportunities to co-author and publish groundbreaking research, engage with customers directly, and attend conferences if desired.

Join Promise as a Founding Marketer and play a pivotal role in shaping our marketing strategy from the ground up. You will have the opportunity to craft compelling narratives, build brand awareness, and drive customer engagement through innovative marketing campaigns. This is a unique chance to make a significant impact in a dynamic and evolving startup environment.

Join our dynamic team at SoFi Technologies as a Senior Frontend Engineer specializing in cryptocurrency solutions. We're at the forefront of financial technology, transforming the way people manage their finances. You will play a crucial role in developing user-centric applications that empower our customers to navigate the world of digital currencies seamlessly.