Senior Fullstack Engineer, Sage
Product
$175-210k
+ Stock Options
3+ days a week in office
Modern operating system for senior care
Job no longer available
Modern operating system for senior care
101-200 employees
Job no longer available
$175-210k
+ Stock Options
3+ days a week in office
101-200 employees
Company mission
To improve the care and quality of life for caregivers and older adults.
Role
Who you are
- This role is ideal for someone who thrives on solving complex user-facing problems, has strong opinions about frontend architecture and APIs, and wants to own the end-to-end delivery of new capabilities
- We expect candidates will typically have at least 5+ years of full-stack engineering experience, with a track record of leading complex projects at scale
- Deep understanding of core React concepts (virtual DOM, componentization, component lifecycle, hooks) and advanced proficiency with building complex frontends using those concepts
- Expertise with TypeScript and modern JavaScript (ES6+)
- Principled approach to managing application state, knowing how to leverage 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
Desirable
- 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
What the job involves
- We’re looking for an experienced Full-Stack Engineer to serve as a senior IC on a new, high-impact project
- While you’ll bring solid backend experience, your strength and passion will be on the frontend building scalable, performant web applications in the modern React ecosystem
- You’ll take ownership of the application architecture and help define the design patterns, frameworks, and best practices that shape how we build software going forward
- You’ll be hands-on, collaborative, and deeply influential in setting technical direction while ensuring that our applications are robust, secure, supportable, and optimized for scale
- 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
Our take
In the event of an accident or fall, elder care facilities largely rely on outdated nurse call systems, which can mean residents wait longer than necessary to receive care or attention. Sage solves this problem by providing carers and institutions with a modern operating system.
Sage's caregiver app allows carers to identify patients in need of help, as well as providing tools for triage and the reviewing of care information. As one of the first companies to bring a data-driven approach to elder care in this way, Sage has received strong attention and raised impressive funding, most recently with the acquisition of $65M.
The age-tech market is growing steadily, and becoming more competitive, which means Sage will need to invest heavily in scaling its outreach in order to consolidate its progress. That said, it has established an early foothold which gives it a place to work from as it develops into the future.
Freddie
Company Specialist at Welcome to the Jungle
Insights
Company
Funding (last 2 of 4 rounds)
Mar 2026
$65m
SERIES C
Dec 2024
$35m
SERIES B
Total funding: $124m
Company benefits
- You and your health: Your health comes first. Sage covers 100% of your individual medical premium, plus dental and vision. Every employee also gets a free OneMedical membership for modern primary care, plus access to mental health support through Talkspace, fertility care through KindBody, and virtual medicine through Teladoc.
- Your family and time: When life happens, we're with you. Sage grants eight weeks of parental leave to non-birthing parents and 12 weeks to birthing parents. We also offer a hybrid work schedule and unlimited PTO, which we encourage you to use. In addition, Sage has seven company holidays and closes for two weeks at the end of December.
- Your financial future: You're building something here, so you should own a piece of it. All full-time employees receive equity as part of their compensation package, along with a 401(k) through Empower, flexible spending accounts for medical and dependent care, and commuter benefits through Optum Financial.
Company HQ
Chelsea, New York, NY
Leadership
Ellen Johnston
(Co-Founder & CPO)Previously Co-Founder, Creative Director and CEO of Makr. She also worked as Director of Digital Experience at Staples.
Matt Lynch
(Co-Founder & CTO)Previously a Senior Software Engineer at the Naval Surface Warfare Center, and a Software Engineering Group Lead at Palantir Technologies.
Raj Mehra
(Co-Founder & CEO)Raj previously co-founded Coupon Doc. He also worked in Corporate Development at Palantir Technologies and as a Head of Strategy & Operations at Cedar.
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