Sage · 1 day ago
Senior Fullstack Engineer, Product
New York, New York, United States
Full-time
Hybrid
Senior Level
$175K/yr - $210K/yr
5+ years expSage49 is a company focused on improving care and quality of life for older adults through innovative technology. They are seeking a Senior Fullstack Engineer to lead the development of a new, high-impact project, focusing on both frontend and backend systems, while ensuring robust and scalable applications.
AppsSocialSoftware
Responsibilities
Lead Development: Architect and implement complex frontend systems in React, while contributing to backend services as needed
Define Standards: Establish design patterns, frameworks, and best practices for building scalable, maintainable web applications
Own Authentication & Security: Design and integrate secure authentication/authorization flows (OAuth2, OIDC, JWT) into user-facing applications
Collaborate Across Stack: Work with backend and infrastructure engineers to design and optimize APIs, data flows, and integration points
Optimize for Performance: Improve rendering performance, load times, caching, and responsiveness across devices and network conditions
Mentor & Guide: Provide technical leadership, code reviews, and mentorship to other engineers
Shape the Future: Play a central role in defining the technical trajectory of a new, mission-critical product
Qualification
Required
At least 5+ years of full-stack engineering experience
Deep understanding of core React concepts (virtual DOM, componentization, component lifecycle, hooks)
Advanced proficiency with building complex frontends using React concepts
Expertise with TypeScript and modern JavaScript (ES6+)
Principled approach to managing application state, leveraging local, contextual, and global state management options
Well-reasoned opinions on route architecture and use of routing concepts (e.g. dynamic and nested routes, route guards, programmatic navigations)
Experience with PWA technologies (service workers, offline caching, push notifications, responsive design)
Working knowledge of backend technologies (Java, Node.js, or similar)
Experience designing and consuming RESTful and/or GraphQL APIs
Comfort with relational and/or NoSQL databases
Hands-on experience implementing OAuth2, OIDC, JWT, and related authentication/authorization patterns
Understanding of secure web application practices (CSRF, XSS, CORS, etc.)
Strong understanding of how to design applications that scale
Knowledge of caching strategies, asynchronous data flows, and client-server performance tradeoffs
Experience with build systems and bundlers (Webpack, Vite, etc.)
Familiarity with CI/CD pipelines and modern deployment environments
Ability to lead design reviews and technical discussions
Track record of mentoring peers and setting engineering standards
Strong communication skills with both technical and non-technical stakeholders
Preferred
Experience working in multi-tenant SaaS platforms
Familiarity with real-time applications (WebSockets, event streams)
Exposure to cloud environments (AWS, GCP, or Azure)
Experience working within design systems and contributing to and/or maintaining component libraries
Benefits
Fully-paid health and dental insurance coverage for all of our employees
Vision insurance
Membership to premium primary and urgent care
Online medical health providers
Take as you need time off policy
7 paid holidays
Company wide winter break during the holidays
Office lunch
Fully stocked snack bar
Company
Sage
Sage is an operation management system that enhances senior caregiving efficiency.
51-200 employees
Funding
Current Stage
Growth StageTotal Funding
$59MKey Investors
IVPMaveronGoldcrest Capital
2024-12-05Series B· $35M
2023-10-25Series A· $15M
2022-07-28Seed· $9M
Leadership Team
Raj Mehra
CEO & Co-founder
Ellen Johnston
Chief Product Officer and Co-founder
Recent News
City A.M.
2026-01-03
Company data provided by crunchbase