Title: Senior Fullstack Software Engineer

Location: New York, NY (In-Office)

Reporting Structure: Reports To: Chief Technology Officer

Company Description

Sparrow partners with credit unions to automate and modernize how they acquire and deepen member relationships. We’ve built the first marketing and engagement platform purpose-built for credit unions replacing generic systems like HubSpot and Salesforce with infrastructure designed specifically for the financial services ecosystem. With 150+ financial institution customers and rapidly expanding across lending and digital banking 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 maintained profitability for over 16 consecutive months, establishing itself as one of the fastest-growing, relationship-driven fintechs in the country. Credit 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 allows credit unions to offer lower fees, better loan terms, and more transparent financial products all while remaining deeply rooted in the communities they serve. Many reinvest directly into local economies, support small businesses, and build long-term relationships with members that extend well beyond a single transaction.

Today, credit unions are underrepresented in mainstream financial awareness. Many Americans are totally unaware of the advantages credit unions offer or even what a credit union is. Credit unions are slowly losing the fight with large national banks and fintechs that invest heavily in advertising, digital experiences, and personalized marketing and many of them remain constrained 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 helping credit unions better understand their members, personalize outreach, and act on real financial needs, Sparrow enables them to strengthen community ties, deepen trust, and continue delivering member-first financial services at scale.

About the Role

The Senior Software Full-Stack Engineer will work closely with the CTO and Head of Product as part 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 stack depending on business priorities, and you’ll be an active participant in planning sessions and technical decision-making.

This is a highly product-oriented engineering role. Beyond determining how something should be built, you will be expected to engage critically with why it should be built—evaluating tradeoffs through the lens of customer value, product fit, and long-term platform health. Your perspective will help ensure we are building the right solutions for credit unions and their end users.

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 codebase

You’ll contribute to both greenfield initiatives and quality-of-life improvements for our growing base of credit union customers. Sparrow values strong ideas over hierarchy—this role provides a real platform for product and technical ideation, where the best ideas win.

Quick facts:

• Compensation: $150K - $200K + Equity
• Website: https://www.sparrowfi.business/
• 150+ financial institution customers
• Triple-digit annual revenue growth since 2020
• Profitable for over 16 consecutive months

Responsibilities

• Working closely with the CTO and Head of Product as part of a lean engineering team of three on Sparrow’s flagship, banking-focused CRM platform, Crest.
• Being deeply involved in understanding product and feature requirements, authoring and executing technical design documents, and implementing high-quality solutions in a highly collaborative environment.
• Working across the frontend, backend, or full stack depending on business priorities, and actively participating in planning sessions and technical decision-making.
• Engaging critically with why something should be built—evaluating tradeoffs through the lens of customer value, product fit, and long-term platform health.
• Having meaningful influence over technical architecture and system design.
• Having meaningful influence over team processes and engineering culture.
• Having meaningful influence over quality, reliability, and maintainability of the codebase.
• Contributing to both greenfield initiatives and quality-of-life improvements for a growing base of credit union customers.
• Creating seamless, user-friendly interfaces using TypeScript, React, and modern frontend tooling.
• Designing and implementing scalable, secure backend APIs and services using Express, DynamoDB, and OpenSearch.
• Designing and building cloud-based services leveraging AWS infrastructure.
• Being involved in planning discussion to deliver feature sets that balance business priorities, user experience, and long-term technical sustainability.
• Actively contributing to architectural discussions, design reviews, and code reviews, bringing a thoughtful and opinionated engineering perspective.
• Owning features from concept through delivery, including design, development, testing, deployment, configuration, and documentation, ensuring high-quality outcomes that meet business requirements.
• Writing clean, testable, and maintainable frontend and backend code.
• Helping drive consistency and best practices across multiple codebases and development workflows.
• Being a highly product-oriented engineer, expected to engage critically with why features should be built and evaluate tradeoffs through the lens of customer value, product fit, and long-term platform health.
• Participating as an active contributor in planning sessions and technical decision-making.

Is this you?

• You have 5+ years of professional experience building and operating production software 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 real end users, and you take pride in delivering work that meaningfully improves how customers operate day to day.
• You thrive in high-impact, high-visibility roles on small teams, where your contributions directly influence product direction, customer outcomes, and company growth.
• You’re excited to make meaningful contributions from day one, taking ownership of production 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 product thinker.
• You’re deeply product-oriented, consistently engaging with the why behind features and evaluating tradeoffs through the lens of customer value and usability.
• You’re willing to challenge assumptions thoughtfully, and you both give and receive candid feedback in service of better technical decisions and stronger outcomes.

#Perks

• Medical, Dental & Vision Insurance: Sparrow covers 90% of premiums for employees and 50% for dependents
• Compensation: $150K - $200K + Equity
• 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 week