Frontend Engineer

Zyphra is a cutting-edge artificial intelligence company located in the heart of San Francisco, California.About the Position:As our Lead Frontend Engineer - Agentic Interfaces, you will spearhead the design and development of the user-facing elements of our agentic systems. Your expertise will shape the way users engage with AI technology across various platforms, including desktop applications and web browsers. You will collaborate closely with engineers, machine learning researchers, and backend teams to create user experiences that are not only functional but also intuitively accessible.Your Responsibilities Include:Crafting and developing user interfaces for both browser and desktop applicationsCreating and maintaining comprehensive component libraries and styling systemsAnalyzing user interactions and refining user flows based on feedback and usage dataPrototyping and implementing UI features in conjunction with machine learning and backend teamsSimplifying the complexities of AI products to ensure they are accessible and empowering for a diverse user baseQualifications:Proficient in frontend technologies, with a strong command of HTML, CSS, and JavaScript/TypeScriptHands-on experience with modern frameworks, particularly ReactA keen eye for UI detail and usability, maintaining a user-centric approachAbility to rapidly prototype and iterate designs using tools like FigmaExperience in designing responsive, accessible, and high-performance user interfacesStrong understanding of human-computer interaction principles, accessibility, and visual designExcellent communication and collaboration skills to work effectively with engineers, designers, and researchersPreferred Qualifications:Experience in designing or developing browser extensions or desktop applications (e.g., Electron, Tauri)Familiarity with mobile platforms and responsive design is a plusPrior involvement in products featuring complex workflows, automation, or agentic behaviorsInterest or experience in backend development, APIs, or AI systems

Summary: Join Interface as a Founding Engineer! We seek versatile engineers (ML, data, full-stack) who are driven, innovative, and eager to make a difference. If you're ready to challenge the status quo and build impactful solutions, we want you on our team! Your Profile:Make swift, informed decisions with a focus on outcomesProactively address issues before they escalateFluent in our technology stack (TypeScript, Python, Docker, LLMs, YOLO, Tesseract, PostgreSQL, AWS, React Native, etc.)Have a proven track record of building functional productsThrive in fast-paced environmentsYour Responsibilities:Engage with users/customers to understand their experiences, challenges, and requirementsDesign robust systems utilized by thousands at billion-dollar enterprisesDevelop autonomous data pipelines for auditing large volumes of documentsEnsure scalable infrastructure managementDeliver quickly – our mantra is progress over perfection.Important Insights:Collaborate directly with the founding team and customersUser needs take precedence over flashy featuresThe team works six days a week in our San Francisco officeEnjoy working in SF: vibrant atmosphere, pleasant weather, and access to the best tech ecosystem in the world Additional Information:We welcome applications from around the globe.We offer competitive compensation, substantial equity, and the chance to influence our early team dynamics.$3,000 referral bonus for successful hires.About Interface: We are pioneers in autonomous safety solutions for the industrial sector, focusing on error detection and correction in industrial documentation. Our AI-powered platform aims to automate compliance tasks across various domains. You will leverage cutting-edge technologies at the crossroads of LLMs, computer vision, and data frameworks to redefine industry standards.

Join Mindlance as a Lead Frontend Engineer and take the next step in your career by leading innovative frontend development projects. We are looking for a creative and driven individual who excels in building user-friendly interfaces and enjoys collaborating with cross-functional teams. You will be responsible for designing and implementing high-quality web applications, optimizing performance, and ensuring a seamless user experience.

Join Interface as a Forward Deployed Engineer! We are on the lookout for innovative generalist engineers (machine learning, data, full-stack) who are not afraid to push boundaries and have a strong drive to succeed. If you thrive in a fast-paced environment and believe in building quickly to achieve results, we want you on our team!Who You Are:You make quick, strategic decisions that can be reversed easily.You proactively identify and resolve issues before they are brought to your attention.You are proficient with our technology stack, including TSX, Python, Docker, LLMs, YOLO, Tesseract, PostgreSQL, AWS, and React Native.You have a track record of building impactful products that are actively used.You excel in dynamic and chaotic environments.Your Responsibilities:Engage with users and customers to understand their experiences, challenges, and needs.Design and architect systems that are utilized daily by large-scale enterprises.Develop autonomous data pipelines that efficiently audit vast amounts of documents.Manage scalable infrastructure to support our growing needs.Deliver solutions rapidly, as we believe that perfectionism can impede progress.Real Talk:Collaborate closely with the founding team and our customers.Prioritize user needs over flashy features and trends.Expect to work six days a week at our office.Be ready for an intense working environment in San Francisco, known for its excellent weather and vibrant tech ecosystem.Additional Information:Remote applications are welcomed from candidates around the globe.We offer competitive salaries, substantial equity, and the opportunity to influence early-stage decisions.Receive a $3,000 bonus for successful referrals!About Interface: We are the leaders in autonomous safety solutions for the industrial sector. We are developing an advanced AI-powered auditing platform that identifies and rectifies errors in various industrial documents, including regulatory filings and CAD files. Join us at the forefront of innovation where LLMs, computer vision, and data pipelines converge to redefine compliance and safety standards.

Why Weave ExistsAt Weave, we are revolutionizing the way therapeutic knowledge is captured, transformed, and communicated throughout the drug development process. Our mission is to empower human experts with cutting-edge AI tools, ensuring drugs reach patients swiftly, safely, and cost-effectively.The Weave Platform optimizes regulatory workflows from inception to completion, seamlessly integrating AI into every phase. Collaborating with our clients, Weave is crafting the ultimate AI toolkit for the entire therapeutic lifecycle.Your Role & MissionWe are in search of a Lead Staff Frontend Engineer to spearhead the technical direction of our frontend platform. This high-impact role involves defining the architecture, establishing engineering standards, and constructing the foundational systems upon which the engineering team will build. You will balance hands-on technical work, cross-team collaboration, and elevating our software development practices.In this role, you will identify key technical challenges, foster alignment on solutions, and ensure our architectural decisions support scalable growth. We prioritize creating simple, well-tested, and reliable systems over pursuing the latest frameworks.What You'll OwnTechnical Leadership & ArchitectureDefine and refine the frontend architecture for our platform, weighing immediate velocity against long-term maintainability.Establish engineering standards, design patterns, and best practices throughout the frontend codebase.Drive the technical strategy and roadmap for frontend infrastructure, architecture, developer tooling, and experience.Be the go-to technical decision-maker for high-stakes, ambiguous problems, documenting your rationale.Foundational SystemsDesign and build the core systems that product engineers rely on: component libraries, shared abstractions, performance infrastructure, and testing frameworks.Oversee the architecture of our document editor experience, including real-time collaboration, conflict resolution, and extensibility.Enhance frontend build, deployment, and observability tools to maintain team speed and confidence.Cross-Team ImpactCollaborate with Product, Design, and backend engineering to formulate technical solutions for complex product challenges.Mentor and guide junior engineers, fostering a culture of knowledge-sharing and continuous improvement.

About SimSim is at the forefront of creating the premier platform for AI agents, empowering developers and enterprises to visually design, deploy, and oversee high-performing agents that streamline workflows globally. Our vision is clear: AI agents will revolutionize how the world operates, and Sim is the key to making that a reality. With backing from renowned investors such as Standard Capital, Paul Graham, Perplexity, SV Angel, and Y Combinator, we have embraced open-source principles from our inception.Based in San Francisco, we are a dynamic, agile team that collaborates in person daily. With over 70,000 developers leveraging Sim, your contributions reach real users quickly and significantly. We value ownership, excellence, and the ambition of our builders as they shape the future from the ground up.Role OverviewAs a Frontend Software Engineer at Sim, you will be pivotal in developing our agent-building canvas and frontend platform. You will design intuitive user experiences, create robust and high-performance UI components, and help shape how thousands of developers utilize Sim. Collaborating with engineering, product, and design teams, you will take features from concept to production, directly influencing our product’s design, performance, and developer experience.Your ResponsibilitiesDesign and develop essential frontend systems focusing on visual, interactive experiences that enable users to create and manage AI agents.Lead the rollout of new features, UI components, and real-time interactions within a Next.js monorepo.Ensure the frontend experience is efficient, refined, and enjoyable at scale.Establish standards for front-end code, UI architecture, and design systems.Work closely with engineering, design, and product teams to create seamless developer workflows.Enhance our custom component library and expand our existing design system.Rapidly prototype and iterate, delivering impactful improvements daily.What We SeekExtensive experience with React and TypeScript.Strong understanding of UI/UX design principles and developer experience.Demonstrated capability to build sophisticated, interactive frontend applications (e.g., canvas editors, visual builders, collaborative tools).Knowledge of frontend performance, animations, and real-time systems (e.g., WebSockets, CRDTs).A proactive approach to problem-solving and a passion for technology.

About KiddomKiddom is an innovative educational platform committed to fostering student equity and growth by integrating high-quality instructional materials with engaging digital learning experiences. Our platform offers exceptional curriculum management capabilities, empowering schools and districts to take charge of their educational content. This results in tailored learning experiences that cater to the unique needs and aspirations of local communities. With detailed insights into teacher and leader performance, Kiddom drives continuous improvement in instructional strategies, school/district programs, and professional development.At Kiddom, we are passionate about revolutionizing education through state-of-the-art technology. Our mission is to create a comprehensive platform that equips educators and learners with advanced tools and data-driven insights. We are seeking a skilled Lead Software Engineer specializing in Frontend development to join our team and spearhead the design and implementation of scalable, frontend-centric solutions.As the Lead Software Engineer - Frontend, you will be pivotal in architecting and delivering full-stack product features with a focus on frontend architecture. Your responsibilities will include defining, building, and optimizing product features and addressing complex challenges at scale. You will collaborate with senior engineers to select optimal tools and technologies while implementing robust, production-ready software solutions.

Join Filevine, a pioneering Legal AI company dedicated to revolutionizing legal work through Legal Operating Intelligence. Our platform integrates data, documents, workflows, and teams into a singular, coherent system, enabling modern legal professionals to work with unprecedented clarity and efficiency.At the heart of our innovation is LOIS, the Legal Operating Intelligence System, which enhances legal operations by transforming them from reactive to proactive. LOIS intelligently analyzes your data to extract insights, simplify complexities, and empower professionals with the knowledge they need to excel. Thanks to our talented and innovative team, Filevine has garnered awards from Deloitte and Inc., recognizing us as one of the fastest-growing and most innovative technology firms in the nation.Role Overview:We are seeking a dedicated UI Engineer to enhance the execution, refinement, and user experience quality of our Word add-in and web application. This engineering-focused position does not involve leading UX strategy or designing workflows from the ground up; rather, you will build upon clearly defined interaction models and design guidance provided by our Product Design Engineer and Frontend leads. Your goal will be to create a product that feels responsive, intentional, and reliable.The ideal candidate will possess a keen attention to detail, a solid understanding of AI system behavior at the UI layer, and the ability to effectively manage streaming states, partial results, and potential error scenarios without glossing over them.

The Role:Join us as a dynamic Frontend Tech Lead at f2-ai, where you'll take the helm in crafting our cutting-edge, AI-driven enterprise UI platform. This is a unique opportunity for an innovative engineer who enjoys building robust systems from the ground up and is eager to influence our technical direction while writing production-level code.Key Responsibilities:UI System Development: Design and implement foundational frontend features, actively coding and delivering essential React/TypeScript components.Frontend Architecture Leadership: Shape the technical vision and roadmap for our React-based UI platform, ensuring swift iterations and effective scaling of user experiences.Performance, Security, and Accessibility: Create high-performance, responsive interfaces that comply with SOC 2 and accessibility standards, emphasizing maintainability and cost-effectiveness.AI Integration: Collaborate with the team to incorporate intelligent features, data visualizations, and interactive tools that reveal AI-driven insights.Engineering Excellence: Establish and maintain coding standards, component libraries, and review processes; mentor fellow engineers to cultivate a culture of reliable, test-driven development.Collaborative Partnerships: Work closely with product, design, backend teams, and enterprise clients to translate requirements into elegant UI solutions.Qualifications:Proven Technical Leadership: 7+ years of experience in building and scaling mission-critical frontend systems using TypeScript and React, with a demonstrated capability to architect solutions from scratch.API Design Proficiency: Extensive experience in designing and utilizing RESTful and GraphQL APIs, including state management and effective data-fetching techniques.Results-Oriented Mindset: You excel in environments where you take ownership of features from start to finish, iterate quickly, and deliver production-ready UI solutions.Familiarity with Styling Solutions: Experience with CSS-in-JS methodologies (e.g., Styled Components, Emotion) or utility-first frameworks like Tailwind.

Overview: Coval is an innovative platform dedicated to simulating and evaluating voice and chat agents. With a successful $3.3M seed funding round and a remarkable tenfold increase in revenue within two months, our platform is experiencing robust demand for automated agent testing. To further fuel our growth, we are seeking a Senior Frontend Engineer to join our dynamic team and enhance our core product experience.About Coval: The future of AI agents is uncertain, yet their impact is undeniable. Coval is poised to be the foundational infrastructure that supports this evolution.Today, anyone can create and deploy an AI agent, but ensuring their reliability is becoming increasingly challenging for businesses.At Coval, we're defining the future of an agent-driven world. With firsthand knowledge of AI agents' operations and limitations, we recognize that as AI adoption surges, the importance of testing and reliability cannot be overstated.Coval empowers companies to develop agents that not only delight customers but also perform reliably in production. As we stand at the forefront of the AI-agent era, our evaluation infrastructure will play a critical role in its development. The question is not if AI agents will be adopted, but when—and Coval aims to be the leading testing platform for agents.We are the pioneers in this field, and our journey has just begun. If you are eager to be part of this exciting venture, we welcome you to join us!Who You Are:You are likely a former founder or a passionate builder.You thrive in the dynamic environment of startups and relish the opportunity to ship and iterate swiftly.You are prepared to take ownership of features from start to finish, using creativity while keeping the user experience at the forefront of your work. Customer satisfaction is your priority.You excel at simplifying complex problems.You have a strong passion for designing intuitive, aesthetically pleasing, and responsive user interfaces.You can envision and create systems with a clear roadmap, understanding the implications of shortcuts.What to Expect at Coval: Joining Coval at this crucial juncture means becoming a key member of the founding team, influencing our product's direction, and making frontend decisions that will drive our growth.

Join DEUNA, an innovative startup at the forefront of transforming global commerce with our cutting-edge AI-driven platform, ATHIA. This remarkable orchestration and payments solution empowers enterprises to enhance approval rates, minimize costs, and unlock new revenue streams. As a product developed by a team that has established DEUNA as the fastest-growing Commerce OS in Latin America, ATHIA integrates payment intelligence, checkout optimization, and data orchestration in one powerful package.With extensive integrations across over 300 payment service providers and alternative payment methods, and with more than 20% of Mexico's digital economy leveraging our platform, we streamline global payments through a single integration and centralized reconciliation.As we expand into the U.S. market to cater to the urgent needs of large retailers, marketplaces, airlines, and quick-service restaurants, we invite you to be part of our team and help shape the future of payments!

ABOUT THE ROLE:As an AI Engineer at Varick, you will take charge of designing and optimizing the intelligence layer within our enterprise operations. This involves creating agent systems that efficiently handle thousands of transactions, make classification decisions, and learn from human interactions.This position is suited for engineers with extensive experience in LLMs, agent architectures, and evaluation systems. You have successfully developed agent workflows that operate in production, not merely in demo environments. Your expertise includes prompt engineering, retrieval, tool calling, multi-agent orchestration, and the evaluation frameworks necessary for deploying trustworthy AI systems in enterprise settings.WHAT YOU'LL DO:• Design and implement agent architectures that tackle complex enterprise workflows, focusing on multi-step reasoning, tool calling, and exception handling.• Develop and sustain evaluation systems that ensure agent quality, accuracy, safety, and groundedness.• Create robust prompt systems, retrieval pipelines, and context engineering strategies to ensure reliable agent performance.• Establish feedback loops that empower agents to learn from human corrections and enhance their functionality over time.• Optimize inference costs and latency for production workloads to ensure efficiency.• Define and uphold best practices for agent reliability, observability, and governance.• Stay updated with the latest models, frameworks, and research to ensure impactful deployments into production.WHAT WE'RE LOOKING FOR:• At least 3 years of software engineering experience, with a minimum of 1–2 years dedicated to LLM applications or AI systems in a production environment.• Practical experience in constructing agent workflows featuring tool calling, retrieval, and multi-step reasoning.• A profound understanding of prompt engineering, context engineering, and methods to elicit reliable behavior from LLMs.• Experience in developing evaluation systems to assess AI output quality.• Proficient in Python with a solid foundation in backend engineering principles.• You have delivered AI features to actual users and have navigated challenges such as hallucinations, edge cases, accuracy drops, and cost management.• Must be based in San Francisco.

OverviewAt mat3ra, we are on the lookout for innovative and experienced Senior Engineers to tackle complex challenges that intersect materials science, artificial intelligence, and software development. Join us in creating a cutting-edge software framework aimed at designing and discovering advanced materials and chemicals. Explore our codebase and connect with our dynamic team on GitHub.Your work will concentrate on: (1) crafting 3D and 2D design applications tailored for nanoscale materials and chemistry, (2) organizing data derived from models and experimental validations, and (3) delivering exceptional user experiences for our platform’s initial user base.As we expand, successful candidates will have opportunities to step into leadership roles. This position is full-time and permanent.

About UsAt Finix, we are revolutionizing the way businesses interact with money. As a comprehensive full-stack acquirer processor, we empower organizations of all sizes with innovative and adaptable payment solutions. Annually processing billions in transactions, Finix enables SaaS, marketplace, and e-commerce platforms to effortlessly accept payments, manage payouts, and onboard merchants. Our suite of no-code, low-code, and developer-friendly tools allows businesses to launch in mere hours rather than months.With over $175 million raised, including a significant $75 million Series C round led by Acrew Capital and backed by notable investors such as Lightspeed Venture Partners, American Express Ventures, and Sequoia Capital, we are poised for growth.As a Senior Frontend Engineer on our Frontend Engineering Team, you will play a pivotal role in architecting and constructing the core payment experiences that empower thousands of businesses. You will be responsible for developing our extensive payments management dashboards and embeddable components that merchants integrate into their applications seamlessly.This position allows you to influence the technical vision for customer-facing products from inception through to production. You will lead design and implementation decisions, ensuring our payment interfaces remain high-performing, secure, and user-friendly as we scale. Our engineering team operates with a high degree of autonomy and ownership—each engineer makes impactful contributions that directly enhance customer success in a dynamic fintech landscape.Finix seeks engineers who possess excellent technical skills, a keen eye for detail, a passion for growth, and a dedication to delivering an outstanding customer experience.

About UsAt thesirius, we're powered by the backing of a16z Speedrun, dedicated to providing innovative solutions that drive growth for top consumer brands. Our advanced technology is relied upon by industry leaders such as Higgsfield and Promova. As we scale our operations, we are on the lookout for talented professionals who are passionate about making impactful contributions to consumer technology advancements. Join our vibrant team where initiative, ambition, and a commitment to excellence in problem-solving are highly valued.Position OverviewIn the role of Senior Frontend Engineer, you will be instrumental in the design, development, and maintenance of the user-facing elements of our core products. Your key responsibilities will include:Crafting and implementing robust, scalable, and user-centric interfaces that accommodate new features and shifting business requirements.Collaborating seamlessly with backend engineers, product managers, and design teams to deliver high-quality, integrated solutions.Providing technical guidance through best practices, mentoring fellow team members, and engaging actively in code reviews.Championing the adoption of contemporary frontend technologies, frameworks, and methodologies to guarantee product quality and maintainability.Identifying and addressing intricate technical challenges pertaining to user experience, performance, and security.Fostering a culture of continuous improvement and operational excellence within the engineering team.QualificationsA minimum of 5 years of professional experience in frontend development for high-traffic applications.Expertise in JavaScript/TypeScript and familiarity with modern frontend frameworks.Proven experience in integrating frontend applications with backend APIs and third-party services.Strong understanding of UI/UX principles, performance optimization, and frontend architecture.Excellent analytical skills with a track record of independently driving projects to successful completion.Full-time availability and a strong passion for contributing to a high-growth, ambitious environment.How to ApplyWe invite you to submit a brief introduction along with your resume for consideration.

About ApiphanyApiphany stands at the forefront of foundational AI technology for physical product development. Our mission is to empower innovators in industries such as automotive, aerospace, medtech, and energy to convert vast amounts of unstructured technical data into real-time, actionable insights. Supported by prominent investors from Markforged, Databricks, GM, and Character, we are dedicated to changing the landscape of engineering decision-making, transforming complexity into clarity for the world's leading manufacturers.Our sophisticated models are tailored to address the intricacies of engineering and manufacturing, comprehending principles of physics, design specifications, and program constraints. We are a tight-knit team of elite builders from top universities including Stanford, Berkeley, MIT, UW, and CMU, alongside industry leaders from GM, Ford, and Genesis Therapeutics. Our passion lies in revolutionizing hard-tech and collaboratively establishing a category-defining enterprise.About the RoleAs a Senior / Staff Frontend Engineer at Apiphany, you will play a crucial role in designing, building, and enhancing our state-of-the-art web application. You will be tasked with implementing high-quality UI components, developing the next generation of data visualization, ensuring optimal performance, and upholding best practices in frontend development.Your contributions will also include shaping the long-term frontend strategy, mentoring team members, and establishing engineering practices that will support the company's growth. You will work closely with design, backend, and machine learning engineers to transform massive data streams into intuitive and actionable insights for users, ensuring a seamless experience.

Example Org is a pioneering software company that facilitates real-time collaboration on critical workflows. Established in 2012, we proudly serve over 10,000 customers globally and are supported by exceptional investors, including Example Capital. Having successfully raised our Series C funding, we are currently valued at $750 million.As a Frontend Engineer at Example Org, you will be an integral part of our innovative team, reporting directly to the team manager. You will have a significant impact on various workflows, contributing to the overall success of our projects.

ABOUT THE ROLE:As a Full Stack Engineer at Varick Agents, you will play a pivotal role in developing the foundational infrastructure and product interfaces that drive our agent deployments. While this position is not client-facing, your contributions will ensure that each deployment is executed with enhanced speed, reliability, and consistency.This dynamic role requires you to engage with backend services, APIs, data pipelines, and user interfaces. Your responsibilities will include creating the orchestration layer for agent execution and developing the dashboards and controls utilized by clients, ensuring that every line of code you write supports real enterprise operations.WHAT YOU'LL DO:Develop and manage backend services for agent orchestration, tool activation, and workflow execution.Design and implement product interfaces for agent monitoring, human-in-the-loop controls, and client dashboards.Construct data pipelines that integrate with various enterprise systems such as ERPs, CRMs, and data warehouses.Create internal tools that expedite deployment processes and minimize engineering time for individual clients.Ensure the reliability, observability, and performance of production systems.Collaborate closely with Frontend Developers to transform client-specific solutions into reusable platform capabilities.WHAT WE'RE LOOKING FOR:At least 3 years of experience in software engineering, specifically in building production systems.Strong understanding of backend fundamentals including APIs, databases, cloud infrastructure, and distributed systems.Proficiency in full stack development, capable of creating both backend services and the UI that interfaces with them.Production experience with Python.Familiarity with cloud infrastructures such as AWS, GCP, or Azure, including containers, managed databases, and CI/CD practices.A commitment to code quality, testing, and the deployment of stable solutions.HELPFUL EXPERIENCE:Experience integrating with enterprise systems (REST/SOAP APIs, webhooks, ETL pipelines).Knowledge of large language model APIs and agent frameworks.Frontend development experience with technologies like React or Next.js.Experience with Infrastructure as Code tools like Terraform or Pulumi.Background in building multi-tenant SaaS or platform products.Experience in startup or early-stage environments.WHY VARICK:Join an innovative team at Varick Agents where you can make a significant impact through your engineering expertise.

Sphere develops AI-driven systems that help businesses navigate and comply with global trade laws. The core platform, TRAM, interprets regulations across more than 190 jurisdictions, enabling clients to stay compliant with speed and accuracy. Backed by a16z and Y Combinator, Sphere operates from its San Francisco headquarters. Role overview The AI Agent Infrastructure Lead guides the technical direction of Sphere’s AI agent infrastructure. This position sits within a small, collaborative team where each person’s contributions directly influence company growth. Sphere’s mission centers on automating compliance for global transactions, from calculation to remittance, to improve efficiency and market access. High reliability is essential, systems are engineered for zero downtime. What you will do Lead technical strategy and architecture for AI agent infrastructure Collaborate closely with a tight-knit team at the San Francisco HQ Ensure systems remain highly reliable and available Why Sphere? Tackle complex infrastructure challenges that affect real-world trade Make a direct impact on a product trusted in over 190 jurisdictions Work alongside a small, dedicated team shaping the company’s future Contribute to the evolution of compliance technology in a rapidly growing company