Sekai

Role Description We are looking for a Senior Machine Learning Engineer to own search and recommendation systems for Sekai’s consumer product. This role sits at the center of content discovery, user engagement, and content distribution. You will build the models and systems that decide what users see, what they search for, what they continue playing, and how high-quality content reaches the right audience. This is a senior IC role for someone who has built real recommendation, search, ranking, or discovery systems in production for consumer apps, especially in entertainment-driven products. What You Will Own - Build and improve recommendation and search systems across feed, discovery, search, and content continuation surfaces. - Own retrieval and ranking systems, including candidate generation, embedding-based retrieval, two-tower models, ranking features, and online serving quality. - Design, launch, and analyze recommendation/search experiments end-to-end, then use the data to iterate quickly. - Improve recommendation quality for new users, new content, and fast-changing content pools. - Build user, content, creator, and session-level representations from behavioral signals. - Partner with product, data, and engineering teams to define metrics, run experiments, and ship measurable improvements to retention, engagement, and content distribution. - Build practical ML systems that can move from prototype to production quickly, with clear monitoring and evaluation. - Help shape the long-term ML architecture for AI-native content discovery. Qualifications - 5+ years of industry experience building production ML systems, with senior-level ownership of recommendation, search, ranking, ads ranking, feed ranking, or content discovery systems. - Hands-on experience building recommendation or search systems for consumer apps. - Experience working on entertainment, social, gaming, short-form content, creator, or other engagement-driven consumer products. - Strong practical experience with two-tower models, embedding retrieval, candidate generation, ranking, and online/offline evaluation. - Strong product intuition around relevance, retention, engagement, satisfaction, cold start, and content distribution. - Ability to translate messy user behavior into useful modeling signals and practical product improvements. - Strong engineering fundamentals across modeling, data pipelines, backend integration, experimentation, and production ML systems. - High ownership, fast execution, and clear communication in ambiguous product environments. Requirements - Experience with AI recommendation, LLM-powered ranking, semantic search, personalized generation, or AI-native content understanding. - Experience with UGC content ecosystems, creator marketplaces, or rapidly changing content catalogs. - Experience with multimodal content understanding across text, image, video, interaction traces, or generated content. - Experience with explore/exploit, contextual bandits, reinforcement learning, or long-term value optimization. - Startup experience or experience building 0-to-1 ML systems with limited infrastructure. Benefits - Top compensation package, including competitive salary and meaningful equity. - Remote-first team. - Comprehensive health insurance and benefits.

Role Description We are looking for a Technical Lead to drive technical execution across backend, frontend, mobile, AI, and data. This is not a traditional people-management role. You will act as a technical partner to the founders, product team, and engineering team — turning ambiguous product goals into clear technical plans, unblocking hard engineering problems, and helping us scale the technical team. Our current technical surface includes: - Python - Go - Next.js - React - React Native - Flutter - Native iOS/Android - AI systems - Data infrastructure - Recommendation systems We do not expect deep expertise in every area. In the AI era, we believe strong engineering leaders should be able to use AI tools to quickly ramp up on new languages, frameworks, and codebases. Responsibilities - Lead technical execution across backend, frontend, mobile, AI, and data initiatives - Translate ambiguous product goals into clear technical plans, milestones, owners, and trade-offs - Dive deep into hard technical problems and help drive them to resolution - Partner with founders, product, design, and engineering on technical decisions - Coordinate cross-domain engineering work and remove execution blockers - Raise the bar for engineering quality, speed, reliability, and maintainability - Help define hiring needs, role requirements, interview criteria, and technical evaluation standards - Build internal AI workflows and foster an AI-native engineering culture Qualifications - 5+ years of professional software engineering experience - Experience leading large-scope technical work across multiple engineers, teams, or product areas - Experience as a Technical Lead, Tech Lead, Engineering Lead, Head of Engineering, CTO, Staff Engineer, or hands-on Engineering Manager - Strong engineering fundamentals and technical judgment across multiple domains - Deep familiarity with AI tools and ability to use AI to augment technical execution and decision-making - Ability to operate under ambiguity and turn unclear goals into executable plans - Strong communication skills with founders, product managers, designers, and engineers - Startup-level ownership, urgency, and willingness to dive into details Preferred Qualifications - Experience with agentic AI systems, LLM workflows, AI agents, or AI-assisted product creation - Experience with machine learning, recommendation systems, ranking, experimentation, or data pipelines - Experience building consumer-facing products, mobile products, social platforms, creator tools, or developer tools - Experience in a VC-backed startup or high-growth technology company - Experience hiring, interviewing, or defining technical bars for engineering roles Benefits - Top compensation package, including competitive salary and meaningful equity - Remote-first team - Comprehensive health insurance and benefits

Role Description We are looking for a Senior Data Engineer to own the data foundation behind Sekai’s product, growth, and company decision-making. This is one of the most important infrastructure roles at Sekai. You will build the systems that help the company understand how users behave, how the product performs, and where we should invest next. This role sits at the intersection of: - Data engineering - Backend instrumentation - Product analytics - Business intelligence - AI-ready internal data tooling The ideal candidate is not just a pipeline builder — they are a product-minded data owner who can turn ambiguous consumer product questions into scalable, trusted data systems. You will work closely with Product, Engineering, Growth, and Leadership, with hands-on ownership across: - BigQuery - PostHog - Amplitude Qualifications - 5+ years of professional experience in data engineering, data platform engineering, or a closely related role. - Strong hands-on experience with SQL, Python, and large-scale analytical data systems. - Deep experience with BigQuery, including warehouse design, query optimization, and cost-aware data modeling. - Experience working with product analytics tools such as PostHog, Amplitude, or similar platforms. - Strong understanding of consumer app analytics, including funnels, retention, cohorts, activation, engagement, and user journeys. - Ability to understand business and product needs, then translate them into scalable data architecture. - Comfortable working with backend engineers on tracking, data contracts, APIs, logs, and production data flows. - High ownership mindset; able to operate independently in a fast-moving startup environment. Requirements - Experience as an early data hire or primary owner of a startup data platform. - Experience building or rebuilding a data warehouse from 0 to 1. - Background in consumer apps, social products, UGC platforms, creator tools, gaming, or mobile-first products. - Backend engineering experience or strong familiarity with backend systems. - Experience building AI-ready data workflows, internal data tools, or governed self-serve analytics systems. - Strong side projects, open-source work, or independently built data products. Benefits - Top-tier salary in the market + competitive equity - Full health insurance - Remote-first team

Role Description We are looking for a Senior Android Engineer to build the native Android foundation for Sekai’s mobile product. This is an Android-first role focused on the core app shell, native platform architecture, product quality, release reliability, and hybrid integration with React Native, Flutter, and web-based experiences. The right person has shipped real consumer Android apps, understands the Android ecosystem deeply, and can make pragmatic architecture decisions in a fast-moving startup environment. You should be comfortable working close to the OS while partnering closely with Product, Design, Backend, and Mobile teams to build a fast, polished, mobile-first consumer experience. Responsibilities - Build and own Sekai’s native Android foundation using Kotlin, Android SDK, and modern Android architecture - Design and improve the Android app shell, navigation, lifecycle handling, session management, permissions, push notifications, deeplinks, and release workflows - Create clean integration points for product modules built in native Android, React Native, Flutter, or WebView - Partner with Product, Design, Backend, and Mobile engineers to ship high-quality consumer mobile experiences - Improve Android app reliability, responsiveness, maintainability, and production quality across real-world devices - Build observability and debugging workflows for crashes, app health, release quality, and user-impacting issues - Define engineering patterns for native modules, cross-stack communication, hybrid screen ownership, testing, CI/CD, and rollout - Use modern AI development tools to move faster while maintaining strong engineering quality Qualifications - 5+ years of professional Android engineering experience - Strong hands-on experience with Kotlin, Android SDK, and production Android app development - Experience building or owning major parts of a consumer-facing Android app - Strong understanding of Android architecture, app lifecycle, navigation, concurrency, networking, persistence, dependency management, and modularization - Experience building high-quality mobile UI using Jetpack Compose and/or the traditional Android View system - Strong product sense and care for mobile user experience, polish, responsiveness, and reliability - Ability to make independent architecture decisions and clearly explain technical tradeoffs - Strong ownership mindset and ability to drive work end-to-end in a fast-paced environment - Comfortable collaborating closely with Product, Design, Backend, Mobile, and Growth teams Preferred Qualifications - Experience leading or helping lead a team to build a mobile app from 0 to 1 - Experience working in a startup or high-growth consumer product environment - Experience with React Native, including native modules, bridges, or hybrid mobile architecture - Experience integrating Flutter or WebView-based modules into native Android apps - Experience with Android performance profiling, startup optimization, memory management, UI responsiveness, crash reduction, or app health monitoring - Experience with mobile observability and analytics tools such as Firebase Crashlytics, Sentry, Datadog, Amplitude, GA4, or similar tools - Experience with feed-based, social, entertainment, creator, gaming, UGC, marketplace, or other high-engagement consumer products - Experience with Gradle, CI/CD, staged rollouts, Play Console, app signing, and release automation - Familiarity with iOS, TypeScript, React Native, Flutter, or web-based interactive content is a plus - Experience using AI coding tools such as Cursor, Claude Code, Codex, or GitHub Copilot Benefits - Top-tier salary in the market + competitive equity - Full health insurance - Remote-first team

Role Description We are looking for an AI-native Mobile Engineer to help build the next generation of Sekai’s mobile experience. This role is focused primarily on React Native development. You will work on core mobile product surfaces, improve performance and quality, and help us build a fast, polished, mobile-first consumer app. You should care deeply about user experience, move fast, and be comfortable using AI tools as part of your daily engineering workflow. The right person is product-minded, strong in ownership, and excited to work across product, design, and engineering in a fast-moving startup environment. Experience with Android Native development is a strong plus, especially if you have worked on mobile performance, startup speed, scrolling performance, memory usage, crash rate, ANR, or low-end Android device optimization. Responsibilities - Build and ship React Native mobile features end-to-end across Sekai’s core consumer experience - Work on high-impact product surfaces such as feed, discovery, creation, play experience, sharing, onboarding, retention, and user engagement - Improve mobile app performance, stability, responsiveness, and overall product quality - Debug and fix production issues quickly, with strong judgment around user impact and prioritization - Collaborate closely with Product, Design, Backend, and Growth to turn product ideas into shipped mobile experiences - Integrate React / web-based interactive content into the mobile app experience where needed - Use analytics, logs, crash reports, and user feedback to identify and solve mobile product issues - Use AI aggressively in day-to-day development, debugging, prototyping, testing, and iteration - Help shape Sekai’s long-term mobile architecture as the product scales Qualifications - 3+ years of professional software engineering experience, ideally with mobile or consumer-facing products - Strong hands-on experience with React Native - Strong proficiency with TypeScript / JavaScript - Experience shipping production mobile apps on iOS and/or Android - Good understanding of mobile app architecture, navigation, state management, API integration, release cycles, and app store deployment - Strong product sense and care for user experience, especially on mobile - Able to debug issues independently and move quickly from problem discovery to shipped fix - Highly AI-native, with strong familiarity using modern AI coding tools such as Cursor, Claude Code, Codex, or similar tools - Strong ownership mindset and ability to drive work end-to-end - Comfortable working in a fast-paced startup environment with ambiguity Preferred Qualifications - Experience with Android Native development, especially Kotlin, Java, Android SDK, or Jetpack Compose - Experience optimizing Android performance, including startup time, scrolling performance, memory usage, crash rate, ANR, and low-end Android device performance - Experience building or maintaining hybrid mobile architectures, including React Native + native modules, WebView integration, or native bridges - Experience with Flutter, especially migrating from Flutter to React Native or maintaining apps across multiple mobile stacks - Experience with mobile-first consumer products, social products, UGC platforms, gaming, entertainment, creator tools, or feed-based apps - Experience with mobile analytics, crash reporting, and performance tools such as Firebase, Amplitude, GA4, Sentry, Datadog, Android Studio Profiler, or similar tools - Experience at an early-stage startup or high-growth consumer company - Strong side projects, open-source contributions, or independently shipped apps are a plus Benefits - Top-tier salary in the market + competitive equity - Full health insurance - Remote-first team

Role Description We are looking for an AI-native Product Manager to help build the next generation of consumer interactive experiences. This role is for someone who combines strong consumer product judgment, hands-on AI usage, strong data analytics, and high ownership. You should be able to understand users, break down ambiguous product problems, analyze product data independently, work closely with engineering and design, and ship fast in a startup environment. We are not looking for a traditional PM who only writes specs or coordinates tasks. We are looking for someone who can own product outcomes, use AI to increase their leverage, and turn complex user problems into simple, high-impact product decisions. Responsibilities - Own some key areas of Sekai’s consumer product experience, including creation, discovery, feed experience, sharing, retention, and creator/player engagement. - Turn ambiguous user problems into clear product hypotheses, priorities, requirements, and execution plans. - Analyze user behavior, funnels, retention, engagement, feedback, and product metrics to identify opportunities. - Define success metrics for product launches and experiments. - Work closely with engineering, design, data, growth, and operations to ship quickly. - Use AI tools to accelerate research, product thinking, data analysis, prototyping, documentation, QA, and execution. - Communicate clearly on priorities, blockers, trade-offs, decisions, and next steps. Qualifications - 2+ years of product management or closely related product-building experience. - Prior experience building consumer products is required. - Strong product sense and user empathy, especially for mobile, social, creator, gaming, entertainment, or content-driven products. - Strong data analytics skills; comfortable analyzing funnels, retention, engagement, cohorts, experiments, and user behavior. - Comfortable using AI tools to write SQL, explore data, generate analysis, summarize insights, and make data-informed product decisions. - Able to independently investigate a product problem using both qualitative feedback and quantitative data. - Actively uses AI tools in daily work, such as Claude Code, Codex, Cursor, OpenClaw similar tools for your daily work. - Able to break down vague goals into clear product plans, metrics, trade-offs, and execution steps. - Strong ownership and follow-through in a fast-moving environment. Preferred Qualifications - Experience with feed-based products, UGC platforms, gaming, social products, AI creation products, or recommendation systems. - Experience improving activation, retention, engagement, sharing, creation success rate, or creator/player growth loops. - Experience working in an early-stage startup or highly ambiguous product environment. - Experience with analytics tools such as Amplitude, GA4, PostHog, BigQuery, similar tools. - Experience building AI workflows, prototypes, side projects, agents, internal tools, or automations. - Ability to use AI tools to create an AI-native workflow that makes their own product work faster, sharper, and more scalable. - Strong taste in consumer UX and interactive product experiences. Benefits - Top tier salary in the market + competitive equity. - Full Health insurance. - Remote first team.

Role Description Sekai is building the TikTok for mini apps — an AI-driven consumer platform where people create, remix, share, and play interactive content instantly. We are looking for our first design hire: a Founding Product Designer who can own the user experience end-to-end and raise the quality bar of the product. This is not a supporting design role. We want someone who can act as a true UX owner — someone who can identify what feels broken or confusing, define better product experiences from first principles, and help shape the product DNA, visual language, and design system of the company. The right person has strong product taste, excellent UX judgment, solid visual craft, and is highly AI-native. Mandarin Chinese is required for this role. Responsibilities - Own end-to-end design across key product surfaces on mobile and web - Drive UX for major product flows and make clear product experience decisions - Improve the overall quality, clarity, and polish of the product - Define and evolve product DNA, visual language, interaction patterns, and design systems - Work closely with founders, product, and engineering to shape and ship new experiences - Use modern AI and design tools to explore, prototype, and iterate quickly Qualifications - 2+ years of product design experience, ideally in consumer or mobile-first products - Strong UX judgment and product sense - Strong visual design skills and high taste level - Ability to design from scratch and bring structure to ambiguous problems - Strong systems thinking and experience building reusable patterns or design systems - High ownership and comfort working in a fast-moving startup - Comfortable working closely with engineers - Highly AI-native and comfortable using modern tools in daily workflow Nice to Have - Experience with consumer social, creator, gaming, or AI products - Frontend or engineering background - Ability to prototype in code or implement light frontend work - Experience as an early or founding designer at a startup Benefits - Competitive base salary + meaningful equity - Full health insurance

Role Description We are looking for a product-centric engineer who cares deeply about user experience, moves fast, and uses AI as a core part of how they build. This role is focused primarily on shipping new product features, while also owning production issues and fixing them quickly when they arise. You will work closely with Product and Engineering to build new user experiences, improve product quality, and iterate fast. The right person is highly AI-native, strong in ownership, and excited to build in a fast-moving startup environment. Responsibilities - Build and ship product features end-to-end, with most of the role focused on new feature development. - Debug and fix production issues quickly, with strong judgment around user impact and prioritization. - Partner closely with Product to turn ideas into shipped experiences and contribute to product direction and user experience decisions. - Use AI aggressively in day-to-day development, debugging, prototyping, and iteration. - Move quickly across the stack to improve product quality, speed, and usability. - Help the team ship faster through strong execution, ownership, and product-minded engineering. Qualifications - 2+ years of experience in software engineering, product engineering, full-stack engineering, or another highly product-oriented technical role. - Strong product sense and clear interest in building user-facing features. - Highly AI-native, with strong familiarity with modern AI coding tools and a habit of actively exploring new tools and workflows. - Strong ownership mindset and ability to drive work end-to-end. - Experience building side projects, experimenting with new ideas, or shipping independently outside of core job responsibilities. - Comfortable working across frontend and backend. - Able to thrive in a fast-paced startup environment. Preferred Qualifications - Experience building mobile-first consumer products. - Experience with Next.js and Python. - Experience at an early-stage startup. - Experience at a high-growth or top VC-backed startup. - Active involvement in open source communities is a plus. - Computer Science background is a plus. - Experience working closely with Product, Design, or founders on user-facing decisions. Benefits - Full healthcare benefits. - Competitive compensation package, including salary and equity.

Role Description Sekai is building the TikTok for mini apps — an AI-driven consumer platform where people create, remix, share, and play interactive content instantly. We are a Series A company backed by Khosla, a16z, Mayfield, and A*, with $30M raised to date. We are remote-first across all positions and are looking for ambitious, AI-native builders who want to help shape the next generation of consumer social products. We’re doubling down on creation quality and reliability. This is a key role with real ownership: the person will run the lane end-to-end and set the technical bar for agent-driven app generation. You will own: - Designing and owning the agent runtime and orchestration layer - Building long-horizon agent workflows: - prompt → plan → generate → run/validate → repair → publish - Developing robust evaluation and quality loops including eval harnesses, regression testing, and failure taxonomy - Designing model strategies including routing, benchmarking, reliability improvements, and cost/latency optimization - Creating debuggable agent systems with tracing, metrics, alerts, and observability Qualifications - Have experience building agentic systems involving tool use, orchestration, retry/repair loops, and context management - Are comfortable working with modern agent frameworks, such as LangChain, LangGraph, Google ADK, Pi-mono, or Vercel AI SDK - Are strong engineers in Python or TypeScript - Have experience shipping and operating production systems - Have strong product instincts and can translate user experience goals into system design decisions Requirements - Bonus points for having built a coding agent, devtool, IDE assistant, or code generation pipeline - Experience building evaluation frameworks (automated scoring, regression suites, release gating) - Experience designing MCP-style tool protocols or robust tool interfaces for LLM systems Benefits - Competitive compensation: salary + equity - Health coverage: we cover full medical insurance / health insurance Company Description If you are excited about building at the frontier of AI, consumer social, and interactive entertainment, we would love to hear from you. At Sekai, you will work with an AI-native team, move fast, own meaningful problems, and have the flexibility to explore new ideas from an early stage.