Sr Full Stack Engineer

Position Title: Sr. Software Engineer - Full Stack Core Platform ServicesLocation: San Francisco, CAType: On-siteDepartment: EngineeringAbout Multiscale AI: Multiscale AI provides advanced AI solutions for Semiconductor Manufacturing Process Optimization (SMPO). With offices in Atlanta, San Francisco, and Hyderabad, we help semiconductor manufacturers optimize fabs and achieve measurable results.The Role: As a Sr. Full Stack Engineer Platform at Multiscale, you will own the design, development, and delivery of our customer-facing platform experiences and extensibility features. You'll build intuitive, high-performance user interfaces that enable data scientists, ML engineers, and business users to interact seamlessly with our AI data platform. On the backend, you'll develop robust middleware services, APIs, and orchestration layers that power our multi-tenant SaaS architecture. A key part of your role will involve architecting and building our AppHuba Replit-like extensible app marketplace and infrastructure where users can discover, install, run, and share custom applications, integrations, and workflows on top of the Multiscale platform. You'll collaborate closely with product, design, and engineering teams to deliver end-to-end experiences that delight our enterprise customers and partners. This is a high-impact role for someone who thrives on full-stack ownership, platform extensibility, and developer experience.Key Responsibilities:Design, develop, and maintain scalable, responsive frontend experiences using modern frameworks (React, Next.js, TypeScript) for the Multiscale platform UIBuild and optimize backend middleware services, RESTful APIs, and GraphQL endpoints to support platform features, integrations, and orchestrationArchitect and implement AppHub infrastructurea marketplace and runtime environment enabling users to develop, deploy, and manage custom apps, extensions, and integrations (similar to Replit, Vercel Marketplace, or Snowflake Marketplace)Develop one-click provisioning, app sandboxing, unified billing, authentication, and app lifecycle management for AppHubCollaborate with cross-functional teams, including product managers, designers, data scientists, and platform engineers to deliver seamless, production-grade user experiencesImplement best practices for security, performance, scalability, and code quality across the full stackParticipate in code reviews, sprint planning, and technical design discussions to drive platform innovationPresent solutions, technical architecture, and insights to stakeholders and leadership Qualifications:Bachelor's or Master's degree in Computer Science, Engineering, or related field5+ years of professional experience in full-stack software engineering, SaaS platforms, or developer toolsHands-on experience with modern frontend technologies (React, Next.js, TypeScript, HTML/CSS, Redux or similar state management)Strong backend development skills with languages like Python, Node.js, GoExperience building and consuming RESTful APIs, GraphQL, and microservices architecturesProven track record developing extensible platforms, marketplaces, or developer tooling (app stores, plugin systems, integration hubs)Excellent problem-solving and analytical skillsStrong communication and teamwork abilities Preferred Skills:Experience building app marketplace infrastructure, extensibility platforms, or developer-facing tooling (e.g., Replit-like environments, Vercel Marketplace, Snowflake Marketplace, VS Code extensions)Familiarity with containerization (Docker, Kubernetes), sandboxing, and orchestration for multi-tenant app executionKnowledge of cloud platforms (AWS, Azure, GCP) and infrastructure-as-code (Terraform, CloudFormation)Experience with CI/CD pipelines, automated testing (Jest, Cypress, Playwright), and DevOps practicesUnderstanding of billing/subscription integrations, app provisioning workflows, and partner/vendor onboardingExposure to data platforms, notebooks (Jupyter), or developer collaboration toolsPassion for developer experience, platform extensibility, and building tools that empower usersBenefits:Competitive salary and equity optionsComprehensive health, dental, and vision coverageFlexible paid time offOpportunity to work with a cutting-edge team in AI and semiconductor technologyMultiscale AI is an equal opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees.
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