Full Stack Engineer

Overview

Job Title: Senior Fullstack Software Engineer

Location: New York, NY (In-Office)

Reports To: Chief Technology Officer

Compensation: $150K - $200K + Equity

Website: https://www.sparrowfi.business/

About the Company

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.

Why Americans Need Credit Unions and Why Credit Unions Need Our Help

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 allowscredit 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.

What You’ll Do

Full-Stack Development

● Create seamless, user-friendly interfaces using TypeScript, React, and modern

frontend tooling.

● Design and implement scalable, secure backend APIs and services using Express and OpenSearch.

● Design and build cloud-based services leveraging AWS infrastructure

Implementation Planning

● Be involved in planning discussion to deliver feature sets that balance business

priorities, 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 that

meet business requirements.

Code Quality & Standards

● Write clean, testable, and maintainable frontend and backend code.

● Help drive consistency and best practices across multiple codebases and development

workflows.

About 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.

● 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.

Benefits

● Medical, Dental & Vision Insurance: Sparrow covers 90% of premiums for employees

and 50% for dependents

● 401(k): Sparrow offers a 3% safe harbor match

● Paid Time Off: 3 weeks 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

Why Join Sparrow

Sparrow is at a true inflection point. Our core product is live in production, the business is

profitable, and the next phase of growth depends on shipping thoughtful, high-quality

product quickly.

This is a deeply hands-on engineering role for someone who loves to build and cares deeply

about product. You’ll be writing code every day, partnering closely with Product, and

continuously enhancing the platform based on real customer feedback. One of the strongest

signals we hear from customers is how much they value the friendliness and approachability

of 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 technology

providers. Many of our customers operate on legacy systems, and there is a massive

opportunity to deeply understand their pain points and help modernize how they work through

thoughtful, well-executed software. You’ll be close to these problems, helping translate real

operational challenges into practical, scalable solutions.

You’ll be close to the product, close to customers, and close to the decisions that shape

Sparrow’s roadmap. If you’re excited by high ownership, high visibility, and the chance to grow

alongside a small team where your work has immediate and meaningful impact, this is a rare

opportunity.

About the Team

Sparrow’s product team is small, technical, and close to the work. Engineering, Product, and

GTM sit in the same room and solve problems together. There are no layers and no handoffs for

the sake of process.

The engineering team is made up of builders who care about systems that work in the real

world. Team members come from strong technical and academic backgrounds, with experience

building and scaling production software that touches sensitive financial data.

Decisions are driven by evidence, not meetings. Product direction is shaped by how customers

actually use the platform, not by abstractions or slide decks. Engineers are involved in

understanding customer constraints, and product decisions are made with a clear view of

implementation reality.

This is a team for people who want proximity to truth, fast feedback loops, and responsibility that grows with impact.