Senior Software Engineer II, Member Growth, Top of Funnel

Spring Health

. Design and build scalable, performant front-end features and systems using React, Next.js, and TypeScript, with a strong emphasis on engineering rigor and maintainability .

Posted 4/21/2026full-timeSan Francisco • California • 🇺🇸 United StatesSenior💰 $207,000 - $233,000 per yearWebsite

Tech Stack

Tools & technologies

JavaScriptNext.jsReactTypeScript

About the role

Key responsibilities & impact

Design and build scalable, performant front-end features and systems using React, Next.js, and TypeScript, with a strong emphasis on engineering rigor and maintainability
Drive top-of-funnel member growth initiatives, including A/B experimentation, feature flagging, and conversion optimization, in close partnership with product and growth teams
Own and improve critical member-facing flows-registration, authentication, onboarding, and provider matching-delivering best-in-class user experiences at scale
Harden existing front-end architecture by identifying and resolving technical debt, improving reliability, reducing latency, and elevating overall code quality
Collaborate with cross-functional teams-product, design, data, and backend engineering-to ship high-impact features that improve the top of funnel experience for members seeking care
Provide technical leadership in architectural discussions, code reviews, and front-end system planning, setting a high bar for the team
Advocate for engineering excellence: test coverage, observability, accessibility, performance benchmarking, and documentation
Own technical delivery for complex front-end projects or subsystems, breaking down ambiguous requirements into incremental, shippable units
Champion improvements in developer experience, front-end tooling, and build infrastructure
Participate in an on-call rotation to support system reliability and respond to production issues
Mentor and support the growth of other engineers on the team

Requirements

What you’ll need

Deep expertise in React, Next.js, and TypeScript; demonstrated mastery of the ecosystem including rendering strategies, state management, performance optimization, and component architecture
Proven ability to independently lead delivery of complex front-end projects from design through production
Experience with growth and experimentation frameworks, including A/B testing, feature flags, and analytics instrumentation (e.g., LaunchDarkly, Mixpanel, or similar)
Strong track record of improving existing systems - refactoring for reliability, performance, scalability, and long-term maintainability - not just shipping net-new features
Experience working in cross-functional Agile teams, partnering closely with product and design
Familiarity with observability and monitoring tools such as Datadog or Sentry
Strong understanding of web performance fundamentals: Core Web Vitals, bundle optimization, lazy loading, and rendering performance
Strong problem-solving skills and high attention to detail.

Benefits

Comp & perks

Health, Dental, Vision benefits start on your first day at Spring. You and your dependents also receive access to One Medical accounts HSA and FSA plans are also available, with Spring contributing up to $1K for HSAs, depending on your plan type.
Employer sponsored 401(k) match of up to 2% for retirement planning
A yearly allotment of no cost visits to the Spring Health network of therapists, coaches, and medication management providers for you and your dependents.
We offer competitive paid time off policies including vacation, sick leave and company holidays.
At 6 months tenure with Spring, we offer parental leave of 18 weeks for birthing parents and 16 weeks for non-birthing parents.
Access to Noom, a weight management program—based in psychology, that’s tailored to your unique needs and goals.
Access to fertility care support through Carrot, in addition to $4,000 reimbursement for related fertility expenses.
Access to Wellhub, which connects employees to the best options for fitness, mindfulness, nutrition, and sleep in one subscription
Access to BrightHorizons, which provides sponsored child care, back-up care, and elder care
Up to $1,000 Professional Development Reimbursement a year.
$200 per year donation matching to support your favorite causes.

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Hard Skills & Tools

ReactNext.jsTypeScriptA/B testingfeature flaggingperformance optimizationstate managementcomponent architectureweb performance fundamentalsrefactoring

Soft Skills

problem-solvingattention to detailtechnical leadershipcollaborationmentoringadvocacy for engineering excellencecommunicationorganizational skillsindependent deliverycross-functional teamwork