Senior Frontend Software Engineer

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 Resolve AIAt Resolve AI, we revolutionize software maintenance and production troubleshooting by developing an autonomous AI Production Engineer capable of diagnosing and resolving intricate system issues from start to finish.Our visionary founders, Spiros Xanthos and Mayank Agarwal, were instrumental in creating OpenTelemetry and have successfully led Splunk Observability, achieving two lucrative exits to Splunk and VMware.We are proud to have secured over $150 million in funding from elite investors such as Lightspeed, Greylock, and Unusual Ventures, alongside notable individual supporters including Jeff Dean (Chief Scientist, Google DeepMind), Thomas Dohmke (CEO, GitHub), Matt Garman (CEO, AWS), Reid Hoffman (Founder, LinkedIn), and Fei-Fei Li (Professor, Stanford).What You Will Be DoingOwn Frontend Design and ImplementationTake charge of delivering an exceptional user experience across Resolve AI's product suite by developing engaging, intuitive, and high-performance interfaces utilizing TypeScript, React, and cutting-edge frontend technologies.Shape Product VisionTransform complex AI capabilities and systems into user-friendly features that empower engineers to seamlessly interact with our AI agent, simplifying powerful workflows.Maintain High Standards of PerformanceCraft scalable frontend architectures that are not only maintainable but also responsive and performant, especially for data-rich visualizations and real-time applications.Collaborate with Users in MindEngage closely with backend engineers, designers, and product managers to drive product discussions and advocate for user-centric solutions that address genuine pain points.Rapid and Responsible IterationQuickly prototype new features and integrate user feedback through tight development cycles, ensuring UI quality through comprehensive testing, accessibility standards, and component reuse.Your Qualifications5+ years of software development experienceExpertise in TypeScript and React, with a strong understanding of modern frontend frameworks and tooling.Proven track record of designing and implementing scalable frontend systems.

Join our dynamic team at Midstream as a Frontend Software Engineer. In this role, you will leverage your technical expertise to design and implement innovative web applications that enhance user experience. You will collaborate with cross-functional teams to deliver high-quality software solutions that meet our clients' needs.

About FernAt Fern, we empower software companies to deliver exceptional API experiences. Our clientele includes renowned firms like Nvidia, Square, and Twilio, alongside innovative AI startups such as ElevenLabs and OpenRouter.As we look to the future, the majority of API integrations will be handled by AI agents. These agents require clearly defined schemas, structured endpoints, deterministic contracts, and concise documentation that can seamlessly integrate into their workflows.Our team, comprised of top-tier talent from Google, Palantir, Amazon, and Uber, thrives in a dynamic environment in Williamsburg, Brooklyn. With our recent acquisition by Postman, we now have access to 40 million users and 98% of the Fortune 500, while retaining our agile startup ethos.About the RoleAs a Frontend Software Engineer at Fern, you will create the interfaces that shape how developers and agents interact with APIs.Craft Exceptional Developer Interfaces: Develop sleek, responsive web experiences utilizing TypeScript and Next.js. Design documentation, dashboards, and tools that simplify complex API interactions.Focus on Performance and Quality: Deliver frontend solutions that are fast, dependable, and visually stunning. You will take ownership of architectural choices and the finer details that elevate our products. Discover how we leverage Vercel and Next.js for efficient multi-tenancy and expedited development cycles.Engage with Customers: Collaborate directly with API teams from industry giants like Nvidia, Twilio, and Square. You will troubleshoot real-world production challenges, refine APIs based on user insights, and implement enhancements swiftly.

About Ivo Inc. Engineering Ivo Inc. builds AI-powered tools that reshape how legal teams work. The engineering group drives projects such as: An AI agent for MS Word that assists with document editing (2023) Agentic Retrieval-Augmented Generation (RAG) using imprecise embeddings models (2023) Large-scale legal fact extraction with LLMs (2024) An AI legal assistant for navigating complex contract databases (2024) Clustering legal documents by lineage (2025) Deviation analysis to uncover risks in contract repositories (2025) Tools for merging contracts and amendments into composite documents (2025) Role Overview: Frontend Software Engineer The Frontend Software Engineer will help shape user experiences for Ivo’s AI-driven legal platform. This role focuses on building intuitive interfaces and collaborating across disciplines to rethink legal workflows. Key Responsibilities Develop real-time, collaborative interfaces using AI capabilities Write efficient, high-performance UI code Create frontend components that integrate with LLM-based agents Work closely with designers, legal specialists, and engineers to improve legal processes Our Mission Many corporate legal teams face long hours and heavy workloads. Ivo’s mission is to ease that burden by automating tedious legal tasks with LLMs. Our AI-native platform has earned strong feedback, including an 85% trial win rate, and is making a difference for attorneys. The journey is just beginning. What Sets Ivo Apart Ivo’s engineers focus on practical solutions and thoughtful product development. Those who care deeply about software quality and want to see their work have real impact will find a strong sense of purpose here. Location San Francisco

About UsAt Sierra, we are revolutionizing how businesses engage with their customers by leveraging the power of AI to create more personalized and meaningful experiences. Though we are primarily an in-person company based in the heart of San Francisco, our presence is expanding globally with offices in Atlanta, New York, London, France, Singapore, and Japan.Our core values—Trust, Customer Obsession, Craftsmanship, Intensity, and Family—shape our culture and guide our decisions. These principles are integral to our mission and the way we operate as a team.Our visionary co-founders, Bret Taylor and Clay Bavor, bring extensive experience from their previous roles at OpenAI, Salesforce, Facebook, and Google, where they have driven groundbreaking innovations in technology.Your Role:Lead Frontend Development Across Key Platforms: You will take ownership of the frontend experience across our core product and marketing channels, ensuring an integrated and polished user experience. This includes developing features for our web application and collaborating on our website to maintain consistency in branding and high-quality user engagement.Drive Design System and UI Component Initiatives: You will architect, build, and sustain a scalable design system and a library of reusable components that empower our engineering and design teams. Your work will foster consistency and excellence across our products, collaborating closely with designers to establish guidelines for rapid development of visually stunning and cohesive user interfaces.Create Exceptional User Experiences: Collaborate with our design team to transform Figma designs into flawless user interfaces with meticulous attention to detail. You will refine UI patterns, ensuring every aspect from typography to animations is thoughtfully executed, resulting in an elegant and intuitive interface that resonates with users.

Join Hive as a Frontend Software Engineer and play a pivotal role in developing cutting-edge user interfaces for our innovative data and enterprise products. Collaborate closely with designers, product owners, and fellow engineers to build engaging web applications using advanced technologies like React, Redux, Webpack, and ES6. Work in a dynamic, fast-paced environment where your technical acumen and design insights will directly influence product features. Enjoy autonomy as you iterate quickly and contribute to the future of AI-driven solutions.

Join Hive as a Senior Frontend Software Engineer!At Hive, we are at the forefront of cloud-based AI solutions, dedicated to revolutionizing the way organizations understand, search, and generate content. Trusted by some of the world's most innovative companies, we empower developers with a suite of top-tier, pre-trained AI models, handling billions of customer API requests each month. Our robust software applications, fueled by proprietary AI models and datasets, are paving the way for groundbreaking use cases in content moderation, brand protection, sponsorship measurement, and context-based advertising.With over $120M raised from esteemed investors such as General Catalyst, 8VC, Glynn Capital, Bain & Company, and Visa Ventures, Hive is proud to employ a diverse team of over 250 talented individuals across our offices in San Francisco, Seattle, and Delhi. If you're ready to shape the future of AI, we want to hear from you!About the RoleAs a Senior Frontend Software Engineer, you will play a pivotal role in developing our Hive Data and Hive Enterprise products. Collaborating closely with designers, product owners, and fellow engineers, you will create innovative user interfaces that define our platforms. Utilizing the latest web technologies, including React, Redux, Webpack, and ES6, you will deliver exceptional user experiences. Given our small, agile team, you will have the opportunity to iterate rapidly and make impactful software design decisions regarding product features. We seek candidates with a strong technical foundation who are passionate about frontend technologies and thrive in a dynamic, fast-paced environment.

Side Inc. builds technology that helps real estate professionals launch and manage their own boutique firms. The company’s platform takes care of legal, regulatory, and operational details, so agents can focus on selling homes and growing their businesses. As a Brokerage-as-a-Service provider, Side streamlines daily operations for real estate entrepreneurs. The platform is designed to improve efficiency, support client relationships, and make it easier for agents to run independent brokerages. Side is headquartered in San Francisco and has secured over $300 million in funding from major venture capital firms. The team includes experienced real estate professionals and engineers who work together to support agents as they build their businesses. Side is known for its rapid growth and ongoing innovation in the real estate sector.

At Lassie, we are revolutionizing the healthcare industry with our AI-driven solutions designed for medical practices.With over a million health practices spending more than $100 billion annually on administrative staff, the demand for efficient solutions has never been greater. The ongoing effects of COVID-19 have left many offices understaffed, leading to frustrated patients dealing with unanswered calls and confusing bills.We envision a future where AI seamlessly manages the operations of medical offices, handling administrative tasks and serving as the interface for patient interactions.Founded by Steijn Pelle, who propelled Robinhood and Coinbase to substantial revenue milestones, and Frédéric Renken, a former engineer and product pioneer at Superhuman, we are infusing consumer product expertise into healthcare and transforming the way doctors and patients engage.About the RoleWe are seeking a design-oriented Senior Frontend Software Engineer to develop a robust control plane for our powerful AI agents that manage billing and medical records. Your work will impact real patients and practices, as you create interfaces that inspire trust and ease of use.Emphasizing a consumer-friendly approach to healthcare software, we prioritize elegance and meticulous attention to detail. Your contributions will encompass various aspects including onboarding, human-in-the-loop review, and tools that empower practice owners to gain insights into their operations.You Are a Great Fit If You…Pursue excellence and are willing to refine your work until it achieves greatnessTake pride in crafting software that is fast and intuitiveSeek to maximize your impact through automation and effective processesPossess strong foundations in JavaScript and browser APIsShare our belief that healthcare software should be as delightful as consumer applicationsSome of Our Notable AchievementsDeveloped a synchronization engine utilizing encrypted SQLite in the browser, facilitating 100ms response times for healthcare payments and patient ledgersImplemented systems that significantly reduce the paperwork burden by thousands of hours each month

Compensation: Competitive base salary with significant equity options.Benefits: Comprehensive health and dental insurance, gym reimbursement, and daily team lunches.At Julius, we are pioneering an applied AI lab focused on developing coding agents. Our mission is to empower one billion individuals to become software creators, starting with innovative data science and analysis applications.Currently, our team has successfully executed 1 million lines of code every 36 hours, catering to over 1 million users while generating more than 3 million data visualizations.Our compact technical team comprises professionals with backgrounds from top companies such as Uber, Microsoft, and Facebook. We are generating revenue and are proudly supported by prominent investors, including AI Grant and founders from Vercel, Notion, Perplexity, Palantir, Replit, Zapier, Intercom, Dropbox, as well as researchers from OpenAI and Google DeepMind.Creating intuitive and high-performance user interfaces is essential for ensuring that Julius remains user-friendly for our vast audience. Our interface encompasses various components such as tool utilization, multi-step reasoning, code generation, execution, file management, and more. In this role, you will have the opportunity to define and build experiences across these elements as we expand toward our future objectives.

About OmniOmni is an innovative business intelligence and embedded analytics platform designed to empower customers to explore, comprehend, and leverage their data effectively. With our headquarters situated in the vibrant city of San Francisco and additional hubs located throughout EMEA and APAC, we proudly partner with esteemed investors such as ICONIQ Growth, Theory Ventures, First Round Capital, Redpoint Ventures, Google Ventures, Snowflake Ventures, and Databricks Ventures.About the RoleAs a Software Engineer focused on AI Frontend, you will play a pivotal role in developing user interfaces and functionalities for our AI-driven analytics service. This position offers you the unique opportunity to craft intelligent workflows and design AI-integrated tools that enhance user experiences.You will collaborate with a highly skilled team and possess the autonomy to prioritize tasks and tackle challenges independently or in conjunction with your colleagues. At Omni, all software engineers engage across our technology stack to address customer needs, whilst our engineering culture emphasizes rapid, iterative shipping without compromising on performance and quality.Recent projects include:Fully functional spreadsheets integrated within our BI platform.Development of an MCP server for Blobby, our AI chatbot capable of generating queries within the constraints of a semantic data model.Facilitating CSV uploads.Enabling data writing capabilities to Google Sheets.

Join the Crew as a Frontend Software Engineer!At Ivo, we sail the seas of innovation! Our engineering team is a band of inventors, leading the charge in the realm of AI and legal technology. We have pioneered:An AI agent that resides in MS Word, transforming documents effortlessly [2023]Revolutionizing embedding models with agentic RAG [2023]Large-scale LLM-based legal fact extraction [2024]A legal assistant capable of searching extensive contract databases with pinpoint accuracy [2024]Clustering legal documents from the same lineage [2025]Automatic deviation analysis to uncover hidden risks in vast contract databases [2025]Integrating contracts with their amendments, creating a seamless series of “composite” contracts that brought tears of joy to our users [2025]Your Mission, Should You Choose to Accept:As a Frontend Engineer, you will craft delightful, user-centric experiences. Your tasks will include:Designing a real-time, collaborative AI-enabled interfaceDeveloping high-performance UI codeImplementing frontend components that seamlessly integrate with LLM-powered agentsCollaborating with designers, lawyers, and fellow engineers to redefine the legal landscape in the era of AIOur Vision:The legal profession is overwhelmed with 80-hour workweeks, tight deadlines, and tedious contract reviews. Until recently, technology offered little relief. But now, with the advent of LLMs, we can restore balance to the lives of lawyers. At Ivo, our mission is to construct an AI-native platform that automates tedious legal tasks. Our software is beloved by users, boasting an impressive 85% trial win rate in a competitive market. We are genuinely transforming lives and are just getting started!

At Sift, we are revolutionizing the development, testing, and operational processes of modern machines. Our innovative platform empowers engineers with real-time insights into high-frequency telemetry, effectively removing bottlenecks and facilitating rapid, reliable development.Originating from our experiences at SpaceX, where we contributed to projects like Dragon, Falcon, Starlink, and Starship, Sift was founded by a team of experts from SpaceX, Google, and Palantir. Our platform is meticulously designed for mission-critical systems where precision and scalability are paramount.As an early member of the engineering team at Sift, you will not only write code but also play a pivotal role in defining the architecture, shaping the product, and cultivating a company culture dedicated to solving significant engineering challenges. If you seek complex technical problems and the chance to construct foundational systems that support intricate machines, we would love to connect with you.

Join Filevine, a pioneering Legal AI firm revolutionizing legal work with our cutting-edge Legal Operating Intelligence platform. We unite data, documents, workflows, and teams into a cohesive system that enhances clarity and consistency in modern legal practice.With our innovative Legal Operating Intelligence System (LOIS), we empower legal professionals to shift from reactive to proactive operations. LOIS comprehensively analyzes your data to uncover insights, automate complex processes, and provide the clarity needed to excel. Recognized by Deloitte and Inc. as a leader in technological innovation, Filevine is experiencing rapid growth and is proud to be a top player in the industry.Position Overview:We are seeking a talented Senior or Staff Frontend Engineer to take ownership of essential product features across our Word and web applications. In this role, you will establish high standards for user interface quality, influence architectural choices, and collaborate closely with design, backend, and AI engineering teams. Your contributions will directly impact the workflows of thousands of legal teams daily.This is an opportunity for individuals looking for significant ownership, rapid iteration cycles, and substantial influence within one of Filevine’s most technical and user-oriented product areas.

About the Role Hinge Health is hiring a Senior Frontend Software Engineer in San Francisco (HQ). This role focuses on developing user interfaces that help patients engage with digital health tools. The work directly supports the company’s goal of making healthcare more accessible and effective.

About CrunchyrollFounded by passionate anime lovers, Crunchyroll passionately delivers the art and culture of anime to over 100 million fans across more than 200 countries and territories. We connect audiences with the stories and characters they cherish through a variety of platforms including streaming video, theatrical releases, games, merchandise, and events.Join our dynamic team and play a pivotal role in shaping the future of anime!About the RoleAs Crunchyroll continues to grow and evolve, we face unique challenges and opportunities to serve our global anime community. We are seeking a Principal Frontend Software Engineer to design, build, and maintain high-performance applications across diverse platforms, including Operator Devices, Game Consoles, Roku, and Smart TVs.In this influential role, you will help define the technical vision and architecture for our client applications, collaborating with various teams to deliver outstanding streaming experiences to our extensive fanbase. You will lead by example, embody engineering excellence, and promote best practices across the organization.Your Responsibilities Include:Developing and optimizing Crunchyroll’s client applications across web platforms with a strong focus on performance, reliability, and scalability.Collaborating cross-functionally with engineers, product managers, and designers to conceptualize and implement new features.Leading technical design reviews, making informed choices regarding technology and architecture.Coordinating and managing dependencies across teams to ensure smooth feature rollouts.Advocating for a culture of engineering quality through thorough code reviews, automated testing, and continuous integration practices.Partnering with leadership to craft and refine a comprehensive testing strategy, including a scalable testing pyramid.Mentoring and guiding fellow engineers through knowledge-sharing, workshops, and pair programming.Encouraging a culture of ownership, accountability, and agility, while embracing ambiguity and adapting to rapidly evolving requirements.As a Principal Software Engineer, you will report directly to the Senior Director of Fan Experiences. We are currently accepting applicants for our San Francisco location.

Role Overview Sigma Computing builds a platform focused on making data accessible and understandable for users at every level. As the team grows in San Francisco, the company is looking for a Senior Frontend Software Engineer with a strong interest in solving complex problems and shaping core product features. What You Will Do Design and build responsive user interfaces, taking features from concept through deployment. Work closely with product managers, UX designers, and backend engineers to deliver features that improve the experience for users, including those without technical backgrounds. Create visualizations for structured and unstructured data, and develop new ways to boost application performance and interactivity. Work with modern front-end tools and frameworks, including React, GraphQL, TypeScript, and Node.js. Location This role is based in San Francisco, CA.

Join Our Mission at 3Y HealthAt 3Y Health, we are revolutionizing the healthcare industry with cutting-edge AI-driven software designed to alleviate the administrative burdens that consume a staggering 40% of healthcare revenue. Our comprehensive platform empowers clinician entrepreneurs, providing them with the tools needed to effectively launch, manage, and grow their private practices. By integrating advanced AI and automation, we enable healthcare providers to reclaim their time, enhance their business operations, and deliver superior outcomes for their communities. We are proud to have secured over $200 million in funding from prestigious investors such as Founders Fund, General Catalyst, Softbank, and 8VC.Your Role as a Frontend EngineerWe are on the lookout for a talented Frontend Engineer who is passionate about crafting intuitive, high-performance user interfaces that resonate with our providers. The ideal candidate will possess extensive knowledge in modern frontend development frameworks, particularly React and TypeScript, coupled with a keen eye for design and user interaction. You will thrive in an environment that values clean, modular code and collaboration with design and product teams to create elegant user experiences. Experience in a startup or as a founding engineer is a plus, showcasing a proactive approach to ownership, speed, and continuous improvement.In this dynamic role, you will influence frontend architecture decisions and work collaboratively across engineering, design, and product teams to enhance our AI-first platform's user experience.