Full Stack Engineer

OverviewJob Title: Senior Fullstack Software EngineerLocation: New York, NY (In-Office)Reports To: Chief Technology OfficerCompensation: $150K - $200K + EquityWebsite: https://www.sparrowfi.business/About the CompanySparrow partners with credit unions to automate and modernize how they acquire and deepenmember relationships. We’ve built the first marketing and engagement platform purpose-built for credit unions replacing generic systems like HubSpot and Salesforce with infrastructuredesigned specifically for the financial services ecosystem.With 150+ financial institution customers and rapidly expanding across lending and digitalbanking integrations, Sparrow is transforming how community financial institutions grow -empowering them to build stronger, more personal member relationships through intelligent,data-driven marketing.Since 2020, Sparrow has achieved triple-digit annual revenue growth and maintainedprofitability for over 16 consecutive months, establishing itself as one of the fastest-growing,relationship-driven fintechs in the country.Why Americans Need Credit Unions and Why Credit Unions Need Our HelpCredit unions are critical to the health of the U.S. financial system. As member-owned,not-for-profit institutions, they exist to serve people, not shareholders. This structure allowscredit unions to offer lower fees, better loan terms, and more transparent financialproducts all while remaining deeply rooted in the communities they serve. Many reinvestdirectly into local economies, support small businesses, and build long-term relationships withmembers that extend well beyond a single transaction.Today, credit unions are underrepresented in mainstream financial awareness. Many Americansare totally unaware of the advantages credit unions offer or even what a credit union is. Creditunions are slowly losing the fight with large national banks and fintechs that invest heavily inadvertising, digital experiences, and personalized marketing and many of them remainconstrained by legacy systems never designed for their member-owned operating model.Without better technology, even the strongest member-first institutions struggle to grow, engage younger generations, and clearly communicate their value.This is where Sparrow comes in. We help credit unions modernize how they reach,understand, and support their members, without compromising trust or mission. By helpingcredit unions better understand their members, personalize outreach, and act on real financialneeds, Sparrow enables them to strengthen community ties, deepen trust, and continuedelivering member-first financial services at scale.About the RoleThe Senior Software Full-Stack Engineer will work closely with the CTO and Head of Product aspart of a lean engineering team of three on Sparrow’s flagship, banking-focused CRM platform,Crest.In this role, you will be deeply involved in understanding product and feature requirements,authoring and executing technical design documents, and implementing high-quality solutions in a highly collaborative environment. You’ll work across the frontend, backend, or full stackdepending on business priorities, and you’ll be an active participant in planning sessions andtechnical decision-making.This is a highly product-oriented engineering role. Beyond determining how somethingshould be built, you will be expected to engage critically with why it should be built—evaluatingtradeoffs through the lens of customer value, product fit, and long-term platform health. Yourperspective will help ensure we are building the right solutions for credit unions and their endusers.As a senior engineer, you’ll have meaningful influence over:● Technical architecture and system design● Team processes and engineering culture● Quality, reliability, and maintainability of the codebaseYou’ll contribute to both greenfield initiatives and quality-of-life improvements for ourgrowing base of credit union customers. Sparrow values strong ideas over hierarchy—this roleprovides a real platform for product and technical ideation, where the best ideas win.What You’ll DoFull-Stack Development● Create seamless, user-friendly interfaces using TypeScript, React, and modernfrontend tooling.● Design and implement scalable, secure backend APIs and services using Express,DynamoDB, and OpenSearch.● Design and build cloud-based services leveraging AWS infrastructureImplementation Planning● Be involved in planning discussion to deliver feature sets that balance businesspriorities, user experience, and long-term technical sustainability.Iterative Review & Collaboration● Actively contribute to architectural discussions, design reviews, and code reviews,bringing a thoughtful and opinionated engineering perspective.End-to-End Ownership● Own features from concept through delivery, including design, development, testing,deployment, configuration, and documentation, ensuring high-quality outcomes thatmeet business requirements.Code Quality & Standards● Write clean, testable, and maintainable frontend and backend code.● Help drive consistency and best practices across multiple codebases and developmentworkflows.About You● You have 5+ years of professional experience building and operating productionsoftware across the stack, with strong experience in TypeScript, React, and Node.js,DynamoDB.● You’ve led, owned, and shipped practical features that solve real problems for realend users, and you take pride in delivering work that meaningfully improves howcustomers operate day to day.● You thrive in high-impact, high-visibility roles on small teams, where yourcontributions directly influence product direction, customer outcomes, and companygrowth.● You’re excited to make meaningful contributions from day one, taking ownership ofproduction systems rather than working in narrowly scoped or abstract roles.● You’re motivated by accelerated professional growth, actively seeking responsibility,ambiguity, and feedback as a way to level up quickly as both an engineer and a productthinker.● You’re deeply product-oriented, consistently engaging with the why behind featuresand evaluating tradeoffs through the lens of customer value and usability.● You’re willing to challenge assumptions thoughtfully, and you both give and receivecandid feedback in service of better technical decisions and stronger outcomes.Benefits● Medical, Dental & Vision Insurance: Sparrow covers 90% of premiums for employeesand 50% for dependents● 401(k): Sparrow offers a 3% safe harbor match● Paid Time Off: 14 days of PTO● In-Office Culture: This role is based in our New York City office● Friday paid lunch: Catered lunch at the end of each weekWhy Join SparrowSparrow is at a true inflection point. Our core product is live in production, the business isprofitable, and the next phase of growth depends on shipping thoughtful, high-qualityproduct quickly.This is a deeply hands-on engineering role for someone who loves to build and cares deeplyabout product. You’ll be writing code every day, partnering closely with Product, andcontinuously enhancing the platform based on real customer feedback. One of the strongestsignals we hear from customers is how much they value the friendliness and approachabilityof the experience—maintaining and elevating that quality is a core part of this role.Sparrow serves a customer base that has been historically underserved by technologyproviders. Many of our customers operate on legacy systems, and there is a massiveopportunity to deeply understand their pain points and help modernize how they work throughthoughtful, well-executed software. You’ll be close to these problems, helping translate realoperational challenges into practical, scalable solutions.You’ll be close to the product, close to customers, and close to the decisions that shapeSparrow’s roadmap. If you’re excited by high ownership, high visibility, and the chance to growalongside a small team where your work has immediate and meaningful impact, this is a rareopportunity.About the TeamSparrow’s product team is small, technical, and close to the work. Engineering, Product, andGTM sit in the same room and solve problems together. There are no layers and no handoffs forthe sake of process.The engineering team is made up of builders who care about systems that work in the realworld. Team members come from strong technical and academic backgrounds, with experiencebuilding and scaling production software that touches sensitive financial data.Decisions are driven by evidence, not meetings. Product direction is shaped by how customersactually use the platform, not by abstractions or slide decks. Engineers are involved inunderstanding customer constraints, and product decisions are made with a clear view ofimplementation reality.This is a team for people who want proximity to truth, fast feedback loops, and responsibility that grows with impact.