Senior Front End Developer

Mine (formerly Fizz)•New York, NY

2d•Onsite

About The Position

We are solving one of the most critical problems society faces today: A decline in financial optimism amongst young adults. Financial literacy has dropped to a 3-decade low. Only 8% of Americans are confident in their ability to make financial decisions. Fewer and fewer believe they’ll match or exceed the financial status of their parents. Enter Mine: The AI Personal Finance Company. We put a financial ally and the tools for financial success in the pocket of every young adult. Today, we help over 1,000,000 users confidently build credit, become personal finance experts, and find line of sight to financial independence. We’re backed by Kleiner Perkins, SV Angel, Y Combinator, and the founders of eight Unicorns, including Postmates, Public, and Checkout.com. In 2025, Mine raised a yet-to-be-announced Series A from top-tier investors to double down on our growth. We've built tools that are top-tier, easy as #$^% to use, and designed to empower our users to reach financial greatness: MoneyGPT: The world's leading AI Money Advisor. Connect your accounts and get personalized insights, alerts, and advice—tailored to your goals, not generic tips. The Mine Card: The first debit card that builds credit. The good parts of a credit card (build credit, awesome rewards) and the easy parts of a debit card (pays itself off daily, can’t spend more than you have in your bank account). We don’t charge interest or hidden fees. Mine Learn: Duolingo-style financial literacy lessons to learn about everything from insurance to inheritance tax. Mine Track: The easiest track and budgeting tool you’ve ever used. MoneyGPT insights + best-in-class charts for total clarity on your spending and credit. And lots more on the roadmap… Our product sits on top of many modern technologies, including a TypeScript/Node.js backend with Express, MongoDB for database storage, React for web applications, and Flutter for mobile platforms. We pride ourselves on leveraging AI wherever possible to speed up internal workflows. We need more engineering firepower. As the newest addition to our Frontend Dev team, you will be instrumental in building and scaling our user-facing applications that serve over 1million+ users. You'll take end-to-end ownership of frontend development, raise the bar significantly for our engineering culture, and help shape the future of how young adults interact with financial products. If you have grit and taste, are an opinionated truth-teller, and take deep joy from crafting exceptional user experiences, Mine is a place to deploy your skillset to drive fast-paced growth and make a real difference. We value in-person work in NYC. It helps us move faster, build genuine friendships, and get stuff done. We support relocation! If you’re unable to move to NYC and are still crazy about Mine, apply anyway.

Requirements

3+ years of experience in mobile development with strong Flutter expertise
Built and maintained mobile/web applications at scale—experience architecting, refactoring, and debugging applications with lots of users
Strong experience with modern frontend tooling, architectural patterns, testing frameworks, and CI/CD pipelines
Experience with observability and analytics tools (Sentry, Datadog, RudderStack, Mixpanel)
Startup experience and ability to thrive in fast-paced, ambiguous environments (wear lots of hats 🧢 👒 ⛑️)

Nice To Haves

Experience with flutter_bloc
Experience building applications with React, TypeScript, and Node.js (Express)
Early employee at a hyper-growth startup
Experience at world-class product orgs (ex: Brex, Ramp, Stripe, CashApp, Airbnb)
Experience optimizing fintech onboarding flows and KYC processes
Strong design sense
Y Combinator experience
Experience with financial services or regulated industries

Responsibilities

Take end-to-end ownership of the frontend development lifecycle—from architecture and implementation to testing, deployment, and optimization.
Build out and iterate on our AI product initiatives
Build and maintain high-quality applications using Flutter
Collaborate closely with designers, product managers, and backend engineers to create intuitive, delightful user experiences
Lead complex technical projects involving multiple engineers and push the design team to deliver world-class products
Balance team collaboration with independent execution to meet ambitious goals and tight timelines
Architect, refactor, and debug applications at scale without introducing regressions
Work with observability tools like Sentry and Datadog to monitor and optimize application performance
Implement and maintain event tracking systems using tools like RudderStack and Mixpanel
Mentor junior developers and help establish engineering best practices