Job Url: https://www.glassdoor.com/Job/united-states-react-jobs-SRCH_IL.0,13_IN1_KO14,19.htm?remoteWorkType=1&fromAge=3 Job Description: Fin 4.2 Senior Full-Stack Software Engineer Apply on employer site New York, NY · $125K - $250K (Employer provided) Apply on employer site Is your resume a good match? Use AI to find out how well the skills on your resume fit this job description. Upload your resume Your qualifications for this job Do you have any of these qualifications? Scope management Software testing System design Cross-functional communication Show more About Fin Fin is a next-generation payments platform built for high-value, global, and instant transactions. We are a Series A-stage company backed by Sequoia, Circle, and other notable investors. Powered by stablecoins, Fin enables users and businesses to move millions of dollars in seconds - whether to other Fin users, directly into bank accounts, or across crypto rails. By combining the speed of crypto with the reliability and trust of traditional finance, Fin reimagines how money moves worldwide. If banks and payment products were reinvented today, they would look like Fin. About the role We are looking for a Senior Full Stack Engineer to join the early team and help define how money moves on Fin. You will work closely with the CEO, CTO, and a small group of senior engineers to design and ship core product experiences, integrate with payment partners (Stripe, PayPal, on and off ramps, banks), and build the systems that let Fin handle millions of transactions safely and reliably. This is a highly autonomous role where you own projects end to end, from shaping the spec to deployment, and see your work in the hands of real users quickly. If you care about building simple products on top of complex systems and are excited about fixing how global payments work, we would love to talk. We value your time: our process focuses on practical system design and architectural discussions, not LeetCode grinding or unpaid take-home assignments. What you will do Design, build, and ship full stack features across our web and mobile surfaces, from APIs and services to polished user interfaces. Own projects end to end: work with product and leadership to scope requirements, design systems, implement, test, and ship to production. Integrate third party payment and financial APIs, including processors, on and off ramps, compliance tooling, and identity providers. Build scalable, high performance services that handle real money movement with strong reliability and observability. Maintain a high bar for code quality through clean abstractions, tests, and thoughtful code review. Collaborate closely with product, design, and operations so that what we ship feels simple for users even when the underlying system is complex. What you need to be successful Deep experience with TypeScript and Node.js. We are mostly a TS shop with some pockets of Rust. Production experience with React Native. Bonus points if you are familiar with the Expo ecosystem and modern mobile build pipelines. Experience owning complex product changes from idea through launch, not just implementing narrow tickets. Deep comfort debugging across the stack, from database and infrastructure issues to front end performance problems. Solid understanding of security best practices, particularly around authentication, authorization, and handling sensitive data. A strong sense of code quality, including testing, readability, and maintainability in a fast moving environment. Clear written and verbal communication, and an ability to work closely with non engineering partners. High tolerance for ambiguity and the necessary shifting targets that exist in an early stage start up environment. Bonus points Experience in EITHER traditional fintech integrations (Stripe, Plaid, ACH rails) OR blockchain infrastructure (especially Solana in a production environment). Prior startup experience where you were an early engineer and had meaningful product ownership. Compensation Range: $125K - $250K Show more Base pay range The minimum salary is $125K and the max salary is $250K. $125K – $250K/yr (Employer provided) $188K /yr Median New York, NY If an employer includes a salary or salary range on their job, we display it as "Employer Provided". If a job has no salary data, Glassdoor displays a "Glassdoor Estimate" if available. To learn more about "Glassdoor Estimates," see our FAQ page. Conversations @Fin Kick off the conversation by asking about salaries, interviews or anything else @Fin. See what other Senior Full-Stack Software Engineer are saying Interview Tips 789K members Salary Negotiations 765K members Explore more Bowls Company overview Size 1 to 50 Employees Founded -- Type Company - Private Industry Internet & Web Services Sector Information Technology Revenue Unknown / Non-Applicable Fin ratings 4.2 85 % Recommend to a friend 100 % Approve of CEO Evan Cummack 1 Ratings Career Opportunities 3.7 Comp & Benefits 3.3 Culture & Values 4.3 Senior Management 4.0 Work/Life Balance 3.4 Fin reviews by full stack engineer